1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> 4 * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved. 5 * 6 * Authors: 7 * Paul Mackerras <paulus@au1.ibm.com> 8 * Alexander Graf <agraf@suse.de> 9 * Kevin Wolf <mail@kevin-wolf.de> 10 * 11 * Description: KVM functions specific to running on Book 3S 12 * processors in hypervisor mode (specifically POWER7 and later). 13 * 14 * This file is derived from arch/powerpc/kvm/book3s.c, 15 * by Alexander Graf <agraf@suse.de>. 16 */ 17 18 #include <linux/kvm_host.h> 19 #include <linux/kernel.h> 20 #include <linux/err.h> 21 #include <linux/slab.h> 22 #include <linux/preempt.h> 23 #include <linux/sched/signal.h> 24 #include <linux/sched/stat.h> 25 #include <linux/delay.h> 26 #include <linux/export.h> 27 #include <linux/fs.h> 28 #include <linux/anon_inodes.h> 29 #include <linux/cpu.h> 30 #include <linux/cpumask.h> 31 #include <linux/spinlock.h> 32 #include <linux/page-flags.h> 33 #include <linux/srcu.h> 34 #include <linux/miscdevice.h> 35 #include <linux/debugfs.h> 36 #include <linux/gfp.h> 37 #include <linux/vmalloc.h> 38 #include <linux/highmem.h> 39 #include <linux/hugetlb.h> 40 #include <linux/kvm_irqfd.h> 41 #include <linux/irqbypass.h> 42 #include <linux/module.h> 43 #include <linux/compiler.h> 44 #include <linux/of.h> 45 #include <linux/irqdomain.h> 46 #include <linux/smp.h> 47 48 #include <asm/ftrace.h> 49 #include <asm/reg.h> 50 #include <asm/ppc-opcode.h> 51 #include <asm/asm-prototypes.h> 52 #include <asm/archrandom.h> 53 #include <asm/debug.h> 54 #include <asm/disassemble.h> 55 #include <asm/cputable.h> 56 #include <asm/cacheflush.h> 57 #include <linux/uaccess.h> 58 #include <asm/interrupt.h> 59 #include <asm/io.h> 60 #include <asm/kvm_ppc.h> 61 #include <asm/kvm_book3s.h> 62 #include <asm/mmu_context.h> 63 #include <asm/lppaca.h> 64 #include <asm/pmc.h> 65 #include <asm/processor.h> 66 #include <asm/cputhreads.h> 67 #include <asm/page.h> 68 #include <asm/hvcall.h> 69 #include <asm/switch_to.h> 70 #include <asm/smp.h> 71 #include <asm/dbell.h> 72 #include <asm/hmi.h> 73 #include <asm/pnv-pci.h> 74 #include <asm/mmu.h> 75 #include <asm/opal.h> 76 #include <asm/xics.h> 77 #include <asm/xive.h> 78 #include <asm/hw_breakpoint.h> 79 #include <asm/kvm_book3s_uvmem.h> 80 #include <asm/ultravisor.h> 81 #include <asm/dtl.h> 82 #include <asm/plpar_wrappers.h> 83 84 #include <trace/events/ipi.h> 85 86 #include "book3s.h" 87 #include "book3s_hv.h" 88 89 #define CREATE_TRACE_POINTS 90 #include "trace_hv.h" 91 92 /* #define EXIT_DEBUG */ 93 /* #define EXIT_DEBUG_SIMPLE */ 94 /* #define EXIT_DEBUG_INT */ 95 96 /* Used to indicate that a guest page fault needs to be handled */ 97 #define RESUME_PAGE_FAULT (RESUME_GUEST | RESUME_FLAG_ARCH1) 98 /* Used to indicate that a guest passthrough interrupt needs to be handled */ 99 #define RESUME_PASSTHROUGH (RESUME_GUEST | RESUME_FLAG_ARCH2) 100 101 /* Used as a "null" value for timebase values */ 102 #define TB_NIL (~(u64)0) 103 104 static DECLARE_BITMAP(default_enabled_hcalls, MAX_HCALL_OPCODE/4 + 1); 105 106 static int dynamic_mt_modes = 6; 107 module_param(dynamic_mt_modes, int, 0644); 108 MODULE_PARM_DESC(dynamic_mt_modes, "Set of allowed dynamic micro-threading modes: 0 (= none), 2, 4, or 6 (= 2 or 4)"); 109 static int target_smt_mode; 110 module_param(target_smt_mode, int, 0644); 111 MODULE_PARM_DESC(target_smt_mode, "Target threads per core (0 = max)"); 112 113 static bool one_vm_per_core; 114 module_param(one_vm_per_core, bool, S_IRUGO | S_IWUSR); 115 MODULE_PARM_DESC(one_vm_per_core, "Only run vCPUs from the same VM on a core (requires POWER8 or older)"); 116 117 #ifdef CONFIG_KVM_XICS 118 static const struct kernel_param_ops module_param_ops = { 119 .set = param_set_int, 120 .get = param_get_int, 121 }; 122 123 module_param_cb(kvm_irq_bypass, &module_param_ops, &kvm_irq_bypass, 0644); 124 MODULE_PARM_DESC(kvm_irq_bypass, "Bypass passthrough interrupt optimization"); 125 126 module_param_cb(h_ipi_redirect, &module_param_ops, &h_ipi_redirect, 0644); 127 MODULE_PARM_DESC(h_ipi_redirect, "Redirect H_IPI wakeup to a free host core"); 128 #endif 129 130 /* If set, guests are allowed to create and control nested guests */ 131 static bool nested = true; 132 module_param(nested, bool, S_IRUGO | S_IWUSR); 133 MODULE_PARM_DESC(nested, "Enable nested virtualization (only on POWER9)"); 134 135 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu); 136 137 /* 138 * RWMR values for POWER8. These control the rate at which PURR 139 * and SPURR count and should be set according to the number of 140 * online threads in the vcore being run. 141 */ 142 #define RWMR_RPA_P8_1THREAD 0x164520C62609AECAUL 143 #define RWMR_RPA_P8_2THREAD 0x7FFF2908450D8DA9UL 144 #define RWMR_RPA_P8_3THREAD 0x164520C62609AECAUL 145 #define RWMR_RPA_P8_4THREAD 0x199A421245058DA9UL 146 #define RWMR_RPA_P8_5THREAD 0x164520C62609AECAUL 147 #define RWMR_RPA_P8_6THREAD 0x164520C62609AECAUL 148 #define RWMR_RPA_P8_7THREAD 0x164520C62609AECAUL 149 #define RWMR_RPA_P8_8THREAD 0x164520C62609AECAUL 150 151 static unsigned long p8_rwmr_values[MAX_SMT_THREADS + 1] = { 152 RWMR_RPA_P8_1THREAD, 153 RWMR_RPA_P8_1THREAD, 154 RWMR_RPA_P8_2THREAD, 155 RWMR_RPA_P8_3THREAD, 156 RWMR_RPA_P8_4THREAD, 157 RWMR_RPA_P8_5THREAD, 158 RWMR_RPA_P8_6THREAD, 159 RWMR_RPA_P8_7THREAD, 160 RWMR_RPA_P8_8THREAD, 161 }; 162 163 static inline struct kvm_vcpu *next_runnable_thread(struct kvmppc_vcore *vc, 164 int *ip) 165 { 166 int i = *ip; 167 struct kvm_vcpu *vcpu; 168 169 while (++i < MAX_SMT_THREADS) { 170 vcpu = READ_ONCE(vc->runnable_threads[i]); 171 if (vcpu) { 172 *ip = i; 173 return vcpu; 174 } 175 } 176 return NULL; 177 } 178 179 /* Used to traverse the list of runnable threads for a given vcore */ 180 #define for_each_runnable_thread(i, vcpu, vc) \ 181 for (i = -1; (vcpu = next_runnable_thread(vc, &i)); ) 182 183 static bool kvmppc_ipi_thread(int cpu) 184 { 185 unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER); 186 187 /* If we're a nested hypervisor, fall back to ordinary IPIs for now */ 188 if (kvmhv_on_pseries()) 189 return false; 190 191 /* On POWER9 we can use msgsnd to IPI any cpu */ 192 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 193 msg |= get_hard_smp_processor_id(cpu); 194 smp_mb(); 195 __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg)); 196 return true; 197 } 198 199 /* On POWER8 for IPIs to threads in the same core, use msgsnd */ 200 if (cpu_has_feature(CPU_FTR_ARCH_207S)) { 201 preempt_disable(); 202 if (cpu_first_thread_sibling(cpu) == 203 cpu_first_thread_sibling(smp_processor_id())) { 204 msg |= cpu_thread_in_core(cpu); 205 smp_mb(); 206 __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg)); 207 preempt_enable(); 208 return true; 209 } 210 preempt_enable(); 211 } 212 213 #if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP) 214 if (cpu >= 0 && cpu < nr_cpu_ids) { 215 if (paca_ptrs[cpu]->kvm_hstate.xics_phys) { 216 xics_wake_cpu(cpu); 217 return true; 218 } 219 opal_int_set_mfrr(get_hard_smp_processor_id(cpu), IPI_PRIORITY); 220 return true; 221 } 222 #endif 223 224 return false; 225 } 226 227 static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu) 228 { 229 int cpu; 230 struct rcuwait *waitp; 231 232 /* 233 * rcuwait_wake_up contains smp_mb() which orders prior stores that 234 * create pending work vs below loads of cpu fields. The other side 235 * is the barrier in vcpu run that orders setting the cpu fields vs 236 * testing for pending work. 237 */ 238 239 waitp = kvm_arch_vcpu_get_wait(vcpu); 240 if (rcuwait_wake_up(waitp)) 241 ++vcpu->stat.generic.halt_wakeup; 242 243 cpu = READ_ONCE(vcpu->arch.thread_cpu); 244 if (cpu >= 0 && kvmppc_ipi_thread(cpu)) 245 return; 246 247 /* CPU points to the first thread of the core */ 248 cpu = vcpu->cpu; 249 if (cpu >= 0 && cpu < nr_cpu_ids && cpu_online(cpu)) 250 smp_send_reschedule(cpu); 251 } 252 253 /* 254 * We use the vcpu_load/put functions to measure stolen time. 255 * 256 * Stolen time is counted as time when either the vcpu is able to 257 * run as part of a virtual core, but the task running the vcore 258 * is preempted or sleeping, or when the vcpu needs something done 259 * in the kernel by the task running the vcpu, but that task is 260 * preempted or sleeping. Those two things have to be counted 261 * separately, since one of the vcpu tasks will take on the job 262 * of running the core, and the other vcpu tasks in the vcore will 263 * sleep waiting for it to do that, but that sleep shouldn't count 264 * as stolen time. 265 * 266 * Hence we accumulate stolen time when the vcpu can run as part of 267 * a vcore using vc->stolen_tb, and the stolen time when the vcpu 268 * needs its task to do other things in the kernel (for example, 269 * service a page fault) in busy_stolen. We don't accumulate 270 * stolen time for a vcore when it is inactive, or for a vcpu 271 * when it is in state RUNNING or NOTREADY. NOTREADY is a bit of 272 * a misnomer; it means that the vcpu task is not executing in 273 * the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in 274 * the kernel. We don't have any way of dividing up that time 275 * between time that the vcpu is genuinely stopped, time that 276 * the task is actively working on behalf of the vcpu, and time 277 * that the task is preempted, so we don't count any of it as 278 * stolen. 279 * 280 * Updates to busy_stolen are protected by arch.tbacct_lock; 281 * updates to vc->stolen_tb are protected by the vcore->stoltb_lock 282 * lock. The stolen times are measured in units of timebase ticks. 283 * (Note that the != TB_NIL checks below are purely defensive; 284 * they should never fail.) 285 * 286 * The POWER9 path is simpler, one vcpu per virtual core so the 287 * former case does not exist. If a vcpu is preempted when it is 288 * BUSY_IN_HOST and not ceded or otherwise blocked, then accumulate 289 * the stolen cycles in busy_stolen. RUNNING is not a preemptible 290 * state in the P9 path. 291 */ 292 293 static void kvmppc_core_start_stolen(struct kvmppc_vcore *vc, u64 tb) 294 { 295 unsigned long flags; 296 297 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); 298 299 spin_lock_irqsave(&vc->stoltb_lock, flags); 300 vc->preempt_tb = tb; 301 spin_unlock_irqrestore(&vc->stoltb_lock, flags); 302 } 303 304 static void kvmppc_core_end_stolen(struct kvmppc_vcore *vc, u64 tb) 305 { 306 unsigned long flags; 307 308 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); 309 310 spin_lock_irqsave(&vc->stoltb_lock, flags); 311 if (vc->preempt_tb != TB_NIL) { 312 vc->stolen_tb += tb - vc->preempt_tb; 313 vc->preempt_tb = TB_NIL; 314 } 315 spin_unlock_irqrestore(&vc->stoltb_lock, flags); 316 } 317 318 static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu) 319 { 320 struct kvmppc_vcore *vc = vcpu->arch.vcore; 321 unsigned long flags; 322 u64 now; 323 324 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 325 if (vcpu->arch.busy_preempt != TB_NIL) { 326 WARN_ON_ONCE(vcpu->arch.state != KVMPPC_VCPU_BUSY_IN_HOST); 327 vc->stolen_tb += mftb() - vcpu->arch.busy_preempt; 328 vcpu->arch.busy_preempt = TB_NIL; 329 } 330 return; 331 } 332 333 now = mftb(); 334 335 /* 336 * We can test vc->runner without taking the vcore lock, 337 * because only this task ever sets vc->runner to this 338 * vcpu, and once it is set to this vcpu, only this task 339 * ever sets it to NULL. 340 */ 341 if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING) 342 kvmppc_core_end_stolen(vc, now); 343 344 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); 345 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST && 346 vcpu->arch.busy_preempt != TB_NIL) { 347 vcpu->arch.busy_stolen += now - vcpu->arch.busy_preempt; 348 vcpu->arch.busy_preempt = TB_NIL; 349 } 350 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); 351 } 352 353 static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu) 354 { 355 struct kvmppc_vcore *vc = vcpu->arch.vcore; 356 unsigned long flags; 357 u64 now; 358 359 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 360 /* 361 * In the P9 path, RUNNABLE is not preemptible 362 * (nor takes host interrupts) 363 */ 364 WARN_ON_ONCE(vcpu->arch.state == KVMPPC_VCPU_RUNNABLE); 365 /* 366 * Account stolen time when preempted while the vcpu task is 367 * running in the kernel (but not in qemu, which is INACTIVE). 368 */ 369 if (task_is_running(current) && 370 vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST) 371 vcpu->arch.busy_preempt = mftb(); 372 return; 373 } 374 375 now = mftb(); 376 377 if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING) 378 kvmppc_core_start_stolen(vc, now); 379 380 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); 381 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST) 382 vcpu->arch.busy_preempt = now; 383 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); 384 } 385 386 static void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr) 387 { 388 vcpu->arch.pvr = pvr; 389 } 390 391 /* Dummy value used in computing PCR value below */ 392 #define PCR_ARCH_31 (PCR_ARCH_300 << 1) 393 394 static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat) 395 { 396 unsigned long host_pcr_bit = 0, guest_pcr_bit = 0; 397 struct kvmppc_vcore *vc = vcpu->arch.vcore; 398 399 /* We can (emulate) our own architecture version and anything older */ 400 if (cpu_has_feature(CPU_FTR_ARCH_31)) 401 host_pcr_bit = PCR_ARCH_31; 402 else if (cpu_has_feature(CPU_FTR_ARCH_300)) 403 host_pcr_bit = PCR_ARCH_300; 404 else if (cpu_has_feature(CPU_FTR_ARCH_207S)) 405 host_pcr_bit = PCR_ARCH_207; 406 else if (cpu_has_feature(CPU_FTR_ARCH_206)) 407 host_pcr_bit = PCR_ARCH_206; 408 else 409 host_pcr_bit = PCR_ARCH_205; 410 411 /* Determine lowest PCR bit needed to run guest in given PVR level */ 412 guest_pcr_bit = host_pcr_bit; 413 if (arch_compat) { 414 switch (arch_compat) { 415 case PVR_ARCH_205: 416 guest_pcr_bit = PCR_ARCH_205; 417 break; 418 case PVR_ARCH_206: 419 case PVR_ARCH_206p: 420 guest_pcr_bit = PCR_ARCH_206; 421 break; 422 case PVR_ARCH_207: 423 guest_pcr_bit = PCR_ARCH_207; 424 break; 425 case PVR_ARCH_300: 426 guest_pcr_bit = PCR_ARCH_300; 427 break; 428 case PVR_ARCH_31: 429 guest_pcr_bit = PCR_ARCH_31; 430 break; 431 default: 432 return -EINVAL; 433 } 434 } 435 436 /* Check requested PCR bits don't exceed our capabilities */ 437 if (guest_pcr_bit > host_pcr_bit) 438 return -EINVAL; 439 440 spin_lock(&vc->lock); 441 vc->arch_compat = arch_compat; 442 /* 443 * Set all PCR bits for which guest_pcr_bit <= bit < host_pcr_bit 444 * Also set all reserved PCR bits 445 */ 446 vc->pcr = (host_pcr_bit - guest_pcr_bit) | PCR_MASK; 447 spin_unlock(&vc->lock); 448 449 return 0; 450 } 451 452 static void kvmppc_dump_regs(struct kvm_vcpu *vcpu) 453 { 454 int r; 455 456 pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id); 457 pr_err("pc = %.16lx msr = %.16llx trap = %x\n", 458 vcpu->arch.regs.nip, vcpu->arch.shregs.msr, vcpu->arch.trap); 459 for (r = 0; r < 16; ++r) 460 pr_err("r%2d = %.16lx r%d = %.16lx\n", 461 r, kvmppc_get_gpr(vcpu, r), 462 r+16, kvmppc_get_gpr(vcpu, r+16)); 463 pr_err("ctr = %.16lx lr = %.16lx\n", 464 vcpu->arch.regs.ctr, vcpu->arch.regs.link); 465 pr_err("srr0 = %.16llx srr1 = %.16llx\n", 466 vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1); 467 pr_err("sprg0 = %.16llx sprg1 = %.16llx\n", 468 vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1); 469 pr_err("sprg2 = %.16llx sprg3 = %.16llx\n", 470 vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3); 471 pr_err("cr = %.8lx xer = %.16lx dsisr = %.8x\n", 472 vcpu->arch.regs.ccr, vcpu->arch.regs.xer, vcpu->arch.shregs.dsisr); 473 pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar); 474 pr_err("fault dar = %.16lx dsisr = %.8x\n", 475 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); 476 pr_err("SLB (%d entries):\n", vcpu->arch.slb_max); 477 for (r = 0; r < vcpu->arch.slb_max; ++r) 478 pr_err(" ESID = %.16llx VSID = %.16llx\n", 479 vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv); 480 pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.16lx\n", 481 vcpu->arch.vcore->lpcr, vcpu->kvm->arch.sdr1, 482 vcpu->arch.last_inst); 483 } 484 485 static struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id) 486 { 487 return kvm_get_vcpu_by_id(kvm, id); 488 } 489 490 static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa) 491 { 492 vpa->__old_status |= LPPACA_OLD_SHARED_PROC; 493 vpa->yield_count = cpu_to_be32(1); 494 } 495 496 static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v, 497 unsigned long addr, unsigned long len) 498 { 499 /* check address is cacheline aligned */ 500 if (addr & (L1_CACHE_BYTES - 1)) 501 return -EINVAL; 502 spin_lock(&vcpu->arch.vpa_update_lock); 503 if (v->next_gpa != addr || v->len != len) { 504 v->next_gpa = addr; 505 v->len = addr ? len : 0; 506 v->update_pending = 1; 507 } 508 spin_unlock(&vcpu->arch.vpa_update_lock); 509 return 0; 510 } 511 512 /* Length for a per-processor buffer is passed in at offset 4 in the buffer */ 513 struct reg_vpa { 514 u32 dummy; 515 union { 516 __be16 hword; 517 __be32 word; 518 } length; 519 }; 520 521 static int vpa_is_registered(struct kvmppc_vpa *vpap) 522 { 523 if (vpap->update_pending) 524 return vpap->next_gpa != 0; 525 return vpap->pinned_addr != NULL; 526 } 527 528 static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu, 529 unsigned long flags, 530 unsigned long vcpuid, unsigned long vpa) 531 { 532 struct kvm *kvm = vcpu->kvm; 533 unsigned long len, nb; 534 void *va; 535 struct kvm_vcpu *tvcpu; 536 int err; 537 int subfunc; 538 struct kvmppc_vpa *vpap; 539 540 tvcpu = kvmppc_find_vcpu(kvm, vcpuid); 541 if (!tvcpu) 542 return H_PARAMETER; 543 544 subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK; 545 if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL || 546 subfunc == H_VPA_REG_SLB) { 547 /* Registering new area - address must be cache-line aligned */ 548 if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa) 549 return H_PARAMETER; 550 551 /* convert logical addr to kernel addr and read length */ 552 va = kvmppc_pin_guest_page(kvm, vpa, &nb); 553 if (va == NULL) 554 return H_PARAMETER; 555 if (subfunc == H_VPA_REG_VPA) 556 len = be16_to_cpu(((struct reg_vpa *)va)->length.hword); 557 else 558 len = be32_to_cpu(((struct reg_vpa *)va)->length.word); 559 kvmppc_unpin_guest_page(kvm, va, vpa, false); 560 561 /* Check length */ 562 if (len > nb || len < sizeof(struct reg_vpa)) 563 return H_PARAMETER; 564 } else { 565 vpa = 0; 566 len = 0; 567 } 568 569 err = H_PARAMETER; 570 vpap = NULL; 571 spin_lock(&tvcpu->arch.vpa_update_lock); 572 573 switch (subfunc) { 574 case H_VPA_REG_VPA: /* register VPA */ 575 /* 576 * The size of our lppaca is 1kB because of the way we align 577 * it for the guest to avoid crossing a 4kB boundary. We only 578 * use 640 bytes of the structure though, so we should accept 579 * clients that set a size of 640. 580 */ 581 BUILD_BUG_ON(sizeof(struct lppaca) != 640); 582 if (len < sizeof(struct lppaca)) 583 break; 584 vpap = &tvcpu->arch.vpa; 585 err = 0; 586 break; 587 588 case H_VPA_REG_DTL: /* register DTL */ 589 if (len < sizeof(struct dtl_entry)) 590 break; 591 len -= len % sizeof(struct dtl_entry); 592 593 /* Check that they have previously registered a VPA */ 594 err = H_RESOURCE; 595 if (!vpa_is_registered(&tvcpu->arch.vpa)) 596 break; 597 598 vpap = &tvcpu->arch.dtl; 599 err = 0; 600 break; 601 602 case H_VPA_REG_SLB: /* register SLB shadow buffer */ 603 /* Check that they have previously registered a VPA */ 604 err = H_RESOURCE; 605 if (!vpa_is_registered(&tvcpu->arch.vpa)) 606 break; 607 608 vpap = &tvcpu->arch.slb_shadow; 609 err = 0; 610 break; 611 612 case H_VPA_DEREG_VPA: /* deregister VPA */ 613 /* Check they don't still have a DTL or SLB buf registered */ 614 err = H_RESOURCE; 615 if (vpa_is_registered(&tvcpu->arch.dtl) || 616 vpa_is_registered(&tvcpu->arch.slb_shadow)) 617 break; 618 619 vpap = &tvcpu->arch.vpa; 620 err = 0; 621 break; 622 623 case H_VPA_DEREG_DTL: /* deregister DTL */ 624 vpap = &tvcpu->arch.dtl; 625 err = 0; 626 break; 627 628 case H_VPA_DEREG_SLB: /* deregister SLB shadow buffer */ 629 vpap = &tvcpu->arch.slb_shadow; 630 err = 0; 631 break; 632 } 633 634 if (vpap) { 635 vpap->next_gpa = vpa; 636 vpap->len = len; 637 vpap->update_pending = 1; 638 } 639 640 spin_unlock(&tvcpu->arch.vpa_update_lock); 641 642 return err; 643 } 644 645 static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap) 646 { 647 struct kvm *kvm = vcpu->kvm; 648 void *va; 649 unsigned long nb; 650 unsigned long gpa; 651 652 /* 653 * We need to pin the page pointed to by vpap->next_gpa, 654 * but we can't call kvmppc_pin_guest_page under the lock 655 * as it does get_user_pages() and down_read(). So we 656 * have to drop the lock, pin the page, then get the lock 657 * again and check that a new area didn't get registered 658 * in the meantime. 659 */ 660 for (;;) { 661 gpa = vpap->next_gpa; 662 spin_unlock(&vcpu->arch.vpa_update_lock); 663 va = NULL; 664 nb = 0; 665 if (gpa) 666 va = kvmppc_pin_guest_page(kvm, gpa, &nb); 667 spin_lock(&vcpu->arch.vpa_update_lock); 668 if (gpa == vpap->next_gpa) 669 break; 670 /* sigh... unpin that one and try again */ 671 if (va) 672 kvmppc_unpin_guest_page(kvm, va, gpa, false); 673 } 674 675 vpap->update_pending = 0; 676 if (va && nb < vpap->len) { 677 /* 678 * If it's now too short, it must be that userspace 679 * has changed the mappings underlying guest memory, 680 * so unregister the region. 681 */ 682 kvmppc_unpin_guest_page(kvm, va, gpa, false); 683 va = NULL; 684 } 685 if (vpap->pinned_addr) 686 kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa, 687 vpap->dirty); 688 vpap->gpa = gpa; 689 vpap->pinned_addr = va; 690 vpap->dirty = false; 691 if (va) 692 vpap->pinned_end = va + vpap->len; 693 } 694 695 static void kvmppc_update_vpas(struct kvm_vcpu *vcpu) 696 { 697 if (!(vcpu->arch.vpa.update_pending || 698 vcpu->arch.slb_shadow.update_pending || 699 vcpu->arch.dtl.update_pending)) 700 return; 701 702 spin_lock(&vcpu->arch.vpa_update_lock); 703 if (vcpu->arch.vpa.update_pending) { 704 kvmppc_update_vpa(vcpu, &vcpu->arch.vpa); 705 if (vcpu->arch.vpa.pinned_addr) 706 init_vpa(vcpu, vcpu->arch.vpa.pinned_addr); 707 } 708 if (vcpu->arch.dtl.update_pending) { 709 kvmppc_update_vpa(vcpu, &vcpu->arch.dtl); 710 vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr; 711 vcpu->arch.dtl_index = 0; 712 } 713 if (vcpu->arch.slb_shadow.update_pending) 714 kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow); 715 spin_unlock(&vcpu->arch.vpa_update_lock); 716 } 717 718 /* 719 * Return the accumulated stolen time for the vcore up until `now'. 720 * The caller should hold the vcore lock. 721 */ 722 static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now) 723 { 724 u64 p; 725 unsigned long flags; 726 727 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); 728 729 spin_lock_irqsave(&vc->stoltb_lock, flags); 730 p = vc->stolen_tb; 731 if (vc->vcore_state != VCORE_INACTIVE && 732 vc->preempt_tb != TB_NIL) 733 p += now - vc->preempt_tb; 734 spin_unlock_irqrestore(&vc->stoltb_lock, flags); 735 return p; 736 } 737 738 static void __kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu, 739 struct lppaca *vpa, 740 unsigned int pcpu, u64 now, 741 unsigned long stolen) 742 { 743 struct dtl_entry *dt; 744 745 dt = vcpu->arch.dtl_ptr; 746 747 if (!dt) 748 return; 749 750 dt->dispatch_reason = 7; 751 dt->preempt_reason = 0; 752 dt->processor_id = cpu_to_be16(pcpu + vcpu->arch.ptid); 753 dt->enqueue_to_dispatch_time = cpu_to_be32(stolen); 754 dt->ready_to_enqueue_time = 0; 755 dt->waiting_to_ready_time = 0; 756 dt->timebase = cpu_to_be64(now); 757 dt->fault_addr = 0; 758 dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu)); 759 dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr); 760 761 ++dt; 762 if (dt == vcpu->arch.dtl.pinned_end) 763 dt = vcpu->arch.dtl.pinned_addr; 764 vcpu->arch.dtl_ptr = dt; 765 /* order writing *dt vs. writing vpa->dtl_idx */ 766 smp_wmb(); 767 vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index); 768 769 /* vcpu->arch.dtl.dirty is set by the caller */ 770 } 771 772 static void kvmppc_update_vpa_dispatch(struct kvm_vcpu *vcpu, 773 struct kvmppc_vcore *vc) 774 { 775 struct lppaca *vpa; 776 unsigned long stolen; 777 unsigned long core_stolen; 778 u64 now; 779 unsigned long flags; 780 781 vpa = vcpu->arch.vpa.pinned_addr; 782 if (!vpa) 783 return; 784 785 now = mftb(); 786 787 core_stolen = vcore_stolen_time(vc, now); 788 stolen = core_stolen - vcpu->arch.stolen_logged; 789 vcpu->arch.stolen_logged = core_stolen; 790 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); 791 stolen += vcpu->arch.busy_stolen; 792 vcpu->arch.busy_stolen = 0; 793 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); 794 795 vpa->enqueue_dispatch_tb = cpu_to_be64(be64_to_cpu(vpa->enqueue_dispatch_tb) + stolen); 796 797 __kvmppc_create_dtl_entry(vcpu, vpa, vc->pcpu, now + vc->tb_offset, stolen); 798 799 vcpu->arch.vpa.dirty = true; 800 } 801 802 static void kvmppc_update_vpa_dispatch_p9(struct kvm_vcpu *vcpu, 803 struct kvmppc_vcore *vc, 804 u64 now) 805 { 806 struct lppaca *vpa; 807 unsigned long stolen; 808 unsigned long stolen_delta; 809 810 vpa = vcpu->arch.vpa.pinned_addr; 811 if (!vpa) 812 return; 813 814 stolen = vc->stolen_tb; 815 stolen_delta = stolen - vcpu->arch.stolen_logged; 816 vcpu->arch.stolen_logged = stolen; 817 818 vpa->enqueue_dispatch_tb = cpu_to_be64(stolen); 819 820 __kvmppc_create_dtl_entry(vcpu, vpa, vc->pcpu, now, stolen_delta); 821 822 vcpu->arch.vpa.dirty = true; 823 } 824 825 /* See if there is a doorbell interrupt pending for a vcpu */ 826 static bool kvmppc_doorbell_pending(struct kvm_vcpu *vcpu) 827 { 828 int thr; 829 struct kvmppc_vcore *vc; 830 831 if (vcpu->arch.doorbell_request) 832 return true; 833 if (cpu_has_feature(CPU_FTR_ARCH_300)) 834 return false; 835 /* 836 * Ensure that the read of vcore->dpdes comes after the read 837 * of vcpu->doorbell_request. This barrier matches the 838 * smp_wmb() in kvmppc_guest_entry_inject(). 839 */ 840 smp_rmb(); 841 vc = vcpu->arch.vcore; 842 thr = vcpu->vcpu_id - vc->first_vcpuid; 843 return !!(vc->dpdes & (1 << thr)); 844 } 845 846 static bool kvmppc_power8_compatible(struct kvm_vcpu *vcpu) 847 { 848 if (vcpu->arch.vcore->arch_compat >= PVR_ARCH_207) 849 return true; 850 if ((!vcpu->arch.vcore->arch_compat) && 851 cpu_has_feature(CPU_FTR_ARCH_207S)) 852 return true; 853 return false; 854 } 855 856 static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags, 857 unsigned long resource, unsigned long value1, 858 unsigned long value2) 859 { 860 switch (resource) { 861 case H_SET_MODE_RESOURCE_SET_CIABR: 862 if (!kvmppc_power8_compatible(vcpu)) 863 return H_P2; 864 if (value2) 865 return H_P4; 866 if (mflags) 867 return H_UNSUPPORTED_FLAG_START; 868 /* Guests can't breakpoint the hypervisor */ 869 if ((value1 & CIABR_PRIV) == CIABR_PRIV_HYPER) 870 return H_P3; 871 kvmppc_set_ciabr_hv(vcpu, value1); 872 return H_SUCCESS; 873 case H_SET_MODE_RESOURCE_SET_DAWR0: 874 if (!kvmppc_power8_compatible(vcpu)) 875 return H_P2; 876 if (!ppc_breakpoint_available()) 877 return H_P2; 878 if (mflags) 879 return H_UNSUPPORTED_FLAG_START; 880 if (value2 & DABRX_HYP) 881 return H_P4; 882 kvmppc_set_dawr0_hv(vcpu, value1); 883 kvmppc_set_dawrx0_hv(vcpu, value2); 884 return H_SUCCESS; 885 case H_SET_MODE_RESOURCE_SET_DAWR1: 886 if (!kvmppc_power8_compatible(vcpu)) 887 return H_P2; 888 if (!ppc_breakpoint_available()) 889 return H_P2; 890 if (!cpu_has_feature(CPU_FTR_DAWR1)) 891 return H_P2; 892 if (!vcpu->kvm->arch.dawr1_enabled) 893 return H_FUNCTION; 894 if (mflags) 895 return H_UNSUPPORTED_FLAG_START; 896 if (value2 & DABRX_HYP) 897 return H_P4; 898 kvmppc_set_dawr1_hv(vcpu, value1); 899 kvmppc_set_dawrx1_hv(vcpu, value2); 900 return H_SUCCESS; 901 case H_SET_MODE_RESOURCE_ADDR_TRANS_MODE: 902 /* 903 * KVM does not support mflags=2 (AIL=2) and AIL=1 is reserved. 904 * Keep this in synch with kvmppc_filter_guest_lpcr_hv. 905 */ 906 if (cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG) && 907 kvmhv_vcpu_is_radix(vcpu) && mflags == 3) 908 return H_UNSUPPORTED_FLAG_START; 909 return H_TOO_HARD; 910 default: 911 return H_TOO_HARD; 912 } 913 } 914 915 /* Copy guest memory in place - must reside within a single memslot */ 916 static int kvmppc_copy_guest(struct kvm *kvm, gpa_t to, gpa_t from, 917 unsigned long len) 918 { 919 struct kvm_memory_slot *to_memslot = NULL; 920 struct kvm_memory_slot *from_memslot = NULL; 921 unsigned long to_addr, from_addr; 922 int r; 923 924 /* Get HPA for from address */ 925 from_memslot = gfn_to_memslot(kvm, from >> PAGE_SHIFT); 926 if (!from_memslot) 927 return -EFAULT; 928 if ((from + len) >= ((from_memslot->base_gfn + from_memslot->npages) 929 << PAGE_SHIFT)) 930 return -EINVAL; 931 from_addr = gfn_to_hva_memslot(from_memslot, from >> PAGE_SHIFT); 932 if (kvm_is_error_hva(from_addr)) 933 return -EFAULT; 934 from_addr |= (from & (PAGE_SIZE - 1)); 935 936 /* Get HPA for to address */ 937 to_memslot = gfn_to_memslot(kvm, to >> PAGE_SHIFT); 938 if (!to_memslot) 939 return -EFAULT; 940 if ((to + len) >= ((to_memslot->base_gfn + to_memslot->npages) 941 << PAGE_SHIFT)) 942 return -EINVAL; 943 to_addr = gfn_to_hva_memslot(to_memslot, to >> PAGE_SHIFT); 944 if (kvm_is_error_hva(to_addr)) 945 return -EFAULT; 946 to_addr |= (to & (PAGE_SIZE - 1)); 947 948 /* Perform copy */ 949 r = raw_copy_in_user((void __user *)to_addr, (void __user *)from_addr, 950 len); 951 if (r) 952 return -EFAULT; 953 mark_page_dirty(kvm, to >> PAGE_SHIFT); 954 return 0; 955 } 956 957 static long kvmppc_h_page_init(struct kvm_vcpu *vcpu, unsigned long flags, 958 unsigned long dest, unsigned long src) 959 { 960 u64 pg_sz = SZ_4K; /* 4K page size */ 961 u64 pg_mask = SZ_4K - 1; 962 int ret; 963 964 /* Check for invalid flags (H_PAGE_SET_LOANED covers all CMO flags) */ 965 if (flags & ~(H_ICACHE_INVALIDATE | H_ICACHE_SYNCHRONIZE | 966 H_ZERO_PAGE | H_COPY_PAGE | H_PAGE_SET_LOANED)) 967 return H_PARAMETER; 968 969 /* dest (and src if copy_page flag set) must be page aligned */ 970 if ((dest & pg_mask) || ((flags & H_COPY_PAGE) && (src & pg_mask))) 971 return H_PARAMETER; 972 973 /* zero and/or copy the page as determined by the flags */ 974 if (flags & H_COPY_PAGE) { 975 ret = kvmppc_copy_guest(vcpu->kvm, dest, src, pg_sz); 976 if (ret < 0) 977 return H_PARAMETER; 978 } else if (flags & H_ZERO_PAGE) { 979 ret = kvm_clear_guest(vcpu->kvm, dest, pg_sz); 980 if (ret < 0) 981 return H_PARAMETER; 982 } 983 984 /* We can ignore the remaining flags */ 985 986 return H_SUCCESS; 987 } 988 989 static int kvm_arch_vcpu_yield_to(struct kvm_vcpu *target) 990 { 991 struct kvmppc_vcore *vcore = target->arch.vcore; 992 993 /* 994 * We expect to have been called by the real mode handler 995 * (kvmppc_rm_h_confer()) which would have directly returned 996 * H_SUCCESS if the source vcore wasn't idle (e.g. if it may 997 * have useful work to do and should not confer) so we don't 998 * recheck that here. 999 * 1000 * In the case of the P9 single vcpu per vcore case, the real 1001 * mode handler is not called but no other threads are in the 1002 * source vcore. 1003 */ 1004 if (!cpu_has_feature(CPU_FTR_ARCH_300)) { 1005 spin_lock(&vcore->lock); 1006 if (target->arch.state == KVMPPC_VCPU_RUNNABLE && 1007 vcore->vcore_state != VCORE_INACTIVE && 1008 vcore->runner) 1009 target = vcore->runner; 1010 spin_unlock(&vcore->lock); 1011 } 1012 1013 return kvm_vcpu_yield_to(target); 1014 } 1015 1016 static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu) 1017 { 1018 int yield_count = 0; 1019 struct lppaca *lppaca; 1020 1021 spin_lock(&vcpu->arch.vpa_update_lock); 1022 lppaca = (struct lppaca *)vcpu->arch.vpa.pinned_addr; 1023 if (lppaca) 1024 yield_count = be32_to_cpu(lppaca->yield_count); 1025 spin_unlock(&vcpu->arch.vpa_update_lock); 1026 return yield_count; 1027 } 1028 1029 /* 1030 * H_RPT_INVALIDATE hcall handler for nested guests. 1031 * 1032 * Handles only nested process-scoped invalidation requests in L0. 1033 */ 1034 static int kvmppc_nested_h_rpt_invalidate(struct kvm_vcpu *vcpu) 1035 { 1036 unsigned long type = kvmppc_get_gpr(vcpu, 6); 1037 unsigned long pid, pg_sizes, start, end; 1038 1039 /* 1040 * The partition-scoped invalidations aren't handled here in L0. 1041 */ 1042 if (type & H_RPTI_TYPE_NESTED) 1043 return RESUME_HOST; 1044 1045 pid = kvmppc_get_gpr(vcpu, 4); 1046 pg_sizes = kvmppc_get_gpr(vcpu, 7); 1047 start = kvmppc_get_gpr(vcpu, 8); 1048 end = kvmppc_get_gpr(vcpu, 9); 1049 1050 do_h_rpt_invalidate_prt(pid, vcpu->arch.nested->shadow_lpid, 1051 type, pg_sizes, start, end); 1052 1053 kvmppc_set_gpr(vcpu, 3, H_SUCCESS); 1054 return RESUME_GUEST; 1055 } 1056 1057 static long kvmppc_h_rpt_invalidate(struct kvm_vcpu *vcpu, 1058 unsigned long id, unsigned long target, 1059 unsigned long type, unsigned long pg_sizes, 1060 unsigned long start, unsigned long end) 1061 { 1062 if (!kvm_is_radix(vcpu->kvm)) 1063 return H_UNSUPPORTED; 1064 1065 if (end < start) 1066 return H_P5; 1067 1068 /* 1069 * Partition-scoped invalidation for nested guests. 1070 */ 1071 if (type & H_RPTI_TYPE_NESTED) { 1072 if (!nesting_enabled(vcpu->kvm)) 1073 return H_FUNCTION; 1074 1075 /* Support only cores as target */ 1076 if (target != H_RPTI_TARGET_CMMU) 1077 return H_P2; 1078 1079 return do_h_rpt_invalidate_pat(vcpu, id, type, pg_sizes, 1080 start, end); 1081 } 1082 1083 /* 1084 * Process-scoped invalidation for L1 guests. 1085 */ 1086 do_h_rpt_invalidate_prt(id, vcpu->kvm->arch.lpid, 1087 type, pg_sizes, start, end); 1088 return H_SUCCESS; 1089 } 1090 1091 int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu) 1092 { 1093 struct kvm *kvm = vcpu->kvm; 1094 unsigned long req = kvmppc_get_gpr(vcpu, 3); 1095 unsigned long target, ret = H_SUCCESS; 1096 int yield_count; 1097 struct kvm_vcpu *tvcpu; 1098 int idx, rc; 1099 1100 if (req <= MAX_HCALL_OPCODE && 1101 !test_bit(req/4, vcpu->kvm->arch.enabled_hcalls)) 1102 return RESUME_HOST; 1103 1104 switch (req) { 1105 case H_REMOVE: 1106 ret = kvmppc_h_remove(vcpu, kvmppc_get_gpr(vcpu, 4), 1107 kvmppc_get_gpr(vcpu, 5), 1108 kvmppc_get_gpr(vcpu, 6)); 1109 if (ret == H_TOO_HARD) 1110 return RESUME_HOST; 1111 break; 1112 case H_ENTER: 1113 ret = kvmppc_h_enter(vcpu, kvmppc_get_gpr(vcpu, 4), 1114 kvmppc_get_gpr(vcpu, 5), 1115 kvmppc_get_gpr(vcpu, 6), 1116 kvmppc_get_gpr(vcpu, 7)); 1117 if (ret == H_TOO_HARD) 1118 return RESUME_HOST; 1119 break; 1120 case H_READ: 1121 ret = kvmppc_h_read(vcpu, kvmppc_get_gpr(vcpu, 4), 1122 kvmppc_get_gpr(vcpu, 5)); 1123 if (ret == H_TOO_HARD) 1124 return RESUME_HOST; 1125 break; 1126 case H_CLEAR_MOD: 1127 ret = kvmppc_h_clear_mod(vcpu, kvmppc_get_gpr(vcpu, 4), 1128 kvmppc_get_gpr(vcpu, 5)); 1129 if (ret == H_TOO_HARD) 1130 return RESUME_HOST; 1131 break; 1132 case H_CLEAR_REF: 1133 ret = kvmppc_h_clear_ref(vcpu, kvmppc_get_gpr(vcpu, 4), 1134 kvmppc_get_gpr(vcpu, 5)); 1135 if (ret == H_TOO_HARD) 1136 return RESUME_HOST; 1137 break; 1138 case H_PROTECT: 1139 ret = kvmppc_h_protect(vcpu, kvmppc_get_gpr(vcpu, 4), 1140 kvmppc_get_gpr(vcpu, 5), 1141 kvmppc_get_gpr(vcpu, 6)); 1142 if (ret == H_TOO_HARD) 1143 return RESUME_HOST; 1144 break; 1145 case H_BULK_REMOVE: 1146 ret = kvmppc_h_bulk_remove(vcpu); 1147 if (ret == H_TOO_HARD) 1148 return RESUME_HOST; 1149 break; 1150 1151 case H_CEDE: 1152 break; 1153 case H_PROD: 1154 target = kvmppc_get_gpr(vcpu, 4); 1155 tvcpu = kvmppc_find_vcpu(kvm, target); 1156 if (!tvcpu) { 1157 ret = H_PARAMETER; 1158 break; 1159 } 1160 tvcpu->arch.prodded = 1; 1161 smp_mb(); /* This orders prodded store vs ceded load */ 1162 if (tvcpu->arch.ceded) 1163 kvmppc_fast_vcpu_kick_hv(tvcpu); 1164 break; 1165 case H_CONFER: 1166 target = kvmppc_get_gpr(vcpu, 4); 1167 if (target == -1) 1168 break; 1169 tvcpu = kvmppc_find_vcpu(kvm, target); 1170 if (!tvcpu) { 1171 ret = H_PARAMETER; 1172 break; 1173 } 1174 yield_count = kvmppc_get_gpr(vcpu, 5); 1175 if (kvmppc_get_yield_count(tvcpu) != yield_count) 1176 break; 1177 kvm_arch_vcpu_yield_to(tvcpu); 1178 break; 1179 case H_REGISTER_VPA: 1180 ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4), 1181 kvmppc_get_gpr(vcpu, 5), 1182 kvmppc_get_gpr(vcpu, 6)); 1183 break; 1184 case H_RTAS: 1185 if (list_empty(&kvm->arch.rtas_tokens)) 1186 return RESUME_HOST; 1187 1188 idx = srcu_read_lock(&kvm->srcu); 1189 rc = kvmppc_rtas_hcall(vcpu); 1190 srcu_read_unlock(&kvm->srcu, idx); 1191 1192 if (rc == -ENOENT) 1193 return RESUME_HOST; 1194 else if (rc == 0) 1195 break; 1196 1197 /* Send the error out to userspace via KVM_RUN */ 1198 return rc; 1199 case H_LOGICAL_CI_LOAD: 1200 ret = kvmppc_h_logical_ci_load(vcpu); 1201 if (ret == H_TOO_HARD) 1202 return RESUME_HOST; 1203 break; 1204 case H_LOGICAL_CI_STORE: 1205 ret = kvmppc_h_logical_ci_store(vcpu); 1206 if (ret == H_TOO_HARD) 1207 return RESUME_HOST; 1208 break; 1209 case H_SET_MODE: 1210 ret = kvmppc_h_set_mode(vcpu, kvmppc_get_gpr(vcpu, 4), 1211 kvmppc_get_gpr(vcpu, 5), 1212 kvmppc_get_gpr(vcpu, 6), 1213 kvmppc_get_gpr(vcpu, 7)); 1214 if (ret == H_TOO_HARD) 1215 return RESUME_HOST; 1216 break; 1217 case H_XIRR: 1218 case H_CPPR: 1219 case H_EOI: 1220 case H_IPI: 1221 case H_IPOLL: 1222 case H_XIRR_X: 1223 if (kvmppc_xics_enabled(vcpu)) { 1224 if (xics_on_xive()) { 1225 ret = H_NOT_AVAILABLE; 1226 return RESUME_GUEST; 1227 } 1228 ret = kvmppc_xics_hcall(vcpu, req); 1229 break; 1230 } 1231 return RESUME_HOST; 1232 case H_SET_DABR: 1233 ret = kvmppc_h_set_dabr(vcpu, kvmppc_get_gpr(vcpu, 4)); 1234 break; 1235 case H_SET_XDABR: 1236 ret = kvmppc_h_set_xdabr(vcpu, kvmppc_get_gpr(vcpu, 4), 1237 kvmppc_get_gpr(vcpu, 5)); 1238 break; 1239 #ifdef CONFIG_SPAPR_TCE_IOMMU 1240 case H_GET_TCE: 1241 ret = kvmppc_h_get_tce(vcpu, kvmppc_get_gpr(vcpu, 4), 1242 kvmppc_get_gpr(vcpu, 5)); 1243 if (ret == H_TOO_HARD) 1244 return RESUME_HOST; 1245 break; 1246 case H_PUT_TCE: 1247 ret = kvmppc_h_put_tce(vcpu, kvmppc_get_gpr(vcpu, 4), 1248 kvmppc_get_gpr(vcpu, 5), 1249 kvmppc_get_gpr(vcpu, 6)); 1250 if (ret == H_TOO_HARD) 1251 return RESUME_HOST; 1252 break; 1253 case H_PUT_TCE_INDIRECT: 1254 ret = kvmppc_h_put_tce_indirect(vcpu, kvmppc_get_gpr(vcpu, 4), 1255 kvmppc_get_gpr(vcpu, 5), 1256 kvmppc_get_gpr(vcpu, 6), 1257 kvmppc_get_gpr(vcpu, 7)); 1258 if (ret == H_TOO_HARD) 1259 return RESUME_HOST; 1260 break; 1261 case H_STUFF_TCE: 1262 ret = kvmppc_h_stuff_tce(vcpu, kvmppc_get_gpr(vcpu, 4), 1263 kvmppc_get_gpr(vcpu, 5), 1264 kvmppc_get_gpr(vcpu, 6), 1265 kvmppc_get_gpr(vcpu, 7)); 1266 if (ret == H_TOO_HARD) 1267 return RESUME_HOST; 1268 break; 1269 #endif 1270 case H_RANDOM: 1271 if (!arch_get_random_seed_longs(&vcpu->arch.regs.gpr[4], 1)) 1272 ret = H_HARDWARE; 1273 break; 1274 case H_RPT_INVALIDATE: 1275 ret = kvmppc_h_rpt_invalidate(vcpu, kvmppc_get_gpr(vcpu, 4), 1276 kvmppc_get_gpr(vcpu, 5), 1277 kvmppc_get_gpr(vcpu, 6), 1278 kvmppc_get_gpr(vcpu, 7), 1279 kvmppc_get_gpr(vcpu, 8), 1280 kvmppc_get_gpr(vcpu, 9)); 1281 break; 1282 1283 case H_SET_PARTITION_TABLE: 1284 ret = H_FUNCTION; 1285 if (nesting_enabled(kvm)) 1286 ret = kvmhv_set_partition_table(vcpu); 1287 break; 1288 case H_ENTER_NESTED: 1289 ret = H_FUNCTION; 1290 if (!nesting_enabled(kvm)) 1291 break; 1292 ret = kvmhv_enter_nested_guest(vcpu); 1293 if (ret == H_INTERRUPT) { 1294 kvmppc_set_gpr(vcpu, 3, 0); 1295 vcpu->arch.hcall_needed = 0; 1296 return -EINTR; 1297 } else if (ret == H_TOO_HARD) { 1298 kvmppc_set_gpr(vcpu, 3, 0); 1299 vcpu->arch.hcall_needed = 0; 1300 return RESUME_HOST; 1301 } 1302 break; 1303 case H_TLB_INVALIDATE: 1304 ret = H_FUNCTION; 1305 if (nesting_enabled(kvm)) 1306 ret = kvmhv_do_nested_tlbie(vcpu); 1307 break; 1308 case H_COPY_TOFROM_GUEST: 1309 ret = H_FUNCTION; 1310 if (nesting_enabled(kvm)) 1311 ret = kvmhv_copy_tofrom_guest_nested(vcpu); 1312 break; 1313 case H_PAGE_INIT: 1314 ret = kvmppc_h_page_init(vcpu, kvmppc_get_gpr(vcpu, 4), 1315 kvmppc_get_gpr(vcpu, 5), 1316 kvmppc_get_gpr(vcpu, 6)); 1317 break; 1318 case H_SVM_PAGE_IN: 1319 ret = H_UNSUPPORTED; 1320 if (kvmppc_get_srr1(vcpu) & MSR_S) 1321 ret = kvmppc_h_svm_page_in(kvm, 1322 kvmppc_get_gpr(vcpu, 4), 1323 kvmppc_get_gpr(vcpu, 5), 1324 kvmppc_get_gpr(vcpu, 6)); 1325 break; 1326 case H_SVM_PAGE_OUT: 1327 ret = H_UNSUPPORTED; 1328 if (kvmppc_get_srr1(vcpu) & MSR_S) 1329 ret = kvmppc_h_svm_page_out(kvm, 1330 kvmppc_get_gpr(vcpu, 4), 1331 kvmppc_get_gpr(vcpu, 5), 1332 kvmppc_get_gpr(vcpu, 6)); 1333 break; 1334 case H_SVM_INIT_START: 1335 ret = H_UNSUPPORTED; 1336 if (kvmppc_get_srr1(vcpu) & MSR_S) 1337 ret = kvmppc_h_svm_init_start(kvm); 1338 break; 1339 case H_SVM_INIT_DONE: 1340 ret = H_UNSUPPORTED; 1341 if (kvmppc_get_srr1(vcpu) & MSR_S) 1342 ret = kvmppc_h_svm_init_done(kvm); 1343 break; 1344 case H_SVM_INIT_ABORT: 1345 /* 1346 * Even if that call is made by the Ultravisor, the SSR1 value 1347 * is the guest context one, with the secure bit clear as it has 1348 * not yet been secured. So we can't check it here. 1349 * Instead the kvm->arch.secure_guest flag is checked inside 1350 * kvmppc_h_svm_init_abort(). 1351 */ 1352 ret = kvmppc_h_svm_init_abort(kvm); 1353 break; 1354 1355 default: 1356 return RESUME_HOST; 1357 } 1358 WARN_ON_ONCE(ret == H_TOO_HARD); 1359 kvmppc_set_gpr(vcpu, 3, ret); 1360 vcpu->arch.hcall_needed = 0; 1361 return RESUME_GUEST; 1362 } 1363 1364 /* 1365 * Handle H_CEDE in the P9 path where we don't call the real-mode hcall 1366 * handlers in book3s_hv_rmhandlers.S. 1367 * 1368 * This has to be done early, not in kvmppc_pseries_do_hcall(), so 1369 * that the cede logic in kvmppc_run_single_vcpu() works properly. 1370 */ 1371 static void kvmppc_cede(struct kvm_vcpu *vcpu) 1372 { 1373 __kvmppc_set_msr_hv(vcpu, __kvmppc_get_msr_hv(vcpu) | MSR_EE); 1374 vcpu->arch.ceded = 1; 1375 smp_mb(); 1376 if (vcpu->arch.prodded) { 1377 vcpu->arch.prodded = 0; 1378 smp_mb(); 1379 vcpu->arch.ceded = 0; 1380 } 1381 } 1382 1383 static int kvmppc_hcall_impl_hv(unsigned long cmd) 1384 { 1385 switch (cmd) { 1386 case H_CEDE: 1387 case H_PROD: 1388 case H_CONFER: 1389 case H_REGISTER_VPA: 1390 case H_SET_MODE: 1391 #ifdef CONFIG_SPAPR_TCE_IOMMU 1392 case H_GET_TCE: 1393 case H_PUT_TCE: 1394 case H_PUT_TCE_INDIRECT: 1395 case H_STUFF_TCE: 1396 #endif 1397 case H_LOGICAL_CI_LOAD: 1398 case H_LOGICAL_CI_STORE: 1399 #ifdef CONFIG_KVM_XICS 1400 case H_XIRR: 1401 case H_CPPR: 1402 case H_EOI: 1403 case H_IPI: 1404 case H_IPOLL: 1405 case H_XIRR_X: 1406 #endif 1407 case H_PAGE_INIT: 1408 case H_RPT_INVALIDATE: 1409 return 1; 1410 } 1411 1412 /* See if it's in the real-mode table */ 1413 return kvmppc_hcall_impl_hv_realmode(cmd); 1414 } 1415 1416 static int kvmppc_emulate_debug_inst(struct kvm_vcpu *vcpu) 1417 { 1418 ppc_inst_t last_inst; 1419 1420 if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) != 1421 EMULATE_DONE) { 1422 /* 1423 * Fetch failed, so return to guest and 1424 * try executing it again. 1425 */ 1426 return RESUME_GUEST; 1427 } 1428 1429 if (ppc_inst_val(last_inst) == KVMPPC_INST_SW_BREAKPOINT) { 1430 vcpu->run->exit_reason = KVM_EXIT_DEBUG; 1431 vcpu->run->debug.arch.address = kvmppc_get_pc(vcpu); 1432 return RESUME_HOST; 1433 } else { 1434 kvmppc_core_queue_program(vcpu, SRR1_PROGILL | 1435 (kvmppc_get_msr(vcpu) & SRR1_PREFIXED)); 1436 return RESUME_GUEST; 1437 } 1438 } 1439 1440 static void do_nothing(void *x) 1441 { 1442 } 1443 1444 static unsigned long kvmppc_read_dpdes(struct kvm_vcpu *vcpu) 1445 { 1446 int thr, cpu, pcpu, nthreads; 1447 struct kvm_vcpu *v; 1448 unsigned long dpdes; 1449 1450 nthreads = vcpu->kvm->arch.emul_smt_mode; 1451 dpdes = 0; 1452 cpu = vcpu->vcpu_id & ~(nthreads - 1); 1453 for (thr = 0; thr < nthreads; ++thr, ++cpu) { 1454 v = kvmppc_find_vcpu(vcpu->kvm, cpu); 1455 if (!v) 1456 continue; 1457 /* 1458 * If the vcpu is currently running on a physical cpu thread, 1459 * interrupt it in order to pull it out of the guest briefly, 1460 * which will update its vcore->dpdes value. 1461 */ 1462 pcpu = READ_ONCE(v->cpu); 1463 if (pcpu >= 0) 1464 smp_call_function_single(pcpu, do_nothing, NULL, 1); 1465 if (kvmppc_doorbell_pending(v)) 1466 dpdes |= 1 << thr; 1467 } 1468 return dpdes; 1469 } 1470 1471 /* 1472 * On POWER9, emulate doorbell-related instructions in order to 1473 * give the guest the illusion of running on a multi-threaded core. 1474 * The instructions emulated are msgsndp, msgclrp, mfspr TIR, 1475 * and mfspr DPDES. 1476 */ 1477 static int kvmppc_emulate_doorbell_instr(struct kvm_vcpu *vcpu) 1478 { 1479 u32 inst, rb, thr; 1480 unsigned long arg; 1481 struct kvm *kvm = vcpu->kvm; 1482 struct kvm_vcpu *tvcpu; 1483 ppc_inst_t pinst; 1484 1485 if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &pinst) != EMULATE_DONE) 1486 return RESUME_GUEST; 1487 inst = ppc_inst_val(pinst); 1488 if (get_op(inst) != 31) 1489 return EMULATE_FAIL; 1490 rb = get_rb(inst); 1491 thr = vcpu->vcpu_id & (kvm->arch.emul_smt_mode - 1); 1492 switch (get_xop(inst)) { 1493 case OP_31_XOP_MSGSNDP: 1494 arg = kvmppc_get_gpr(vcpu, rb); 1495 if (((arg >> 27) & 0x1f) != PPC_DBELL_SERVER) 1496 break; 1497 arg &= 0x7f; 1498 if (arg >= kvm->arch.emul_smt_mode) 1499 break; 1500 tvcpu = kvmppc_find_vcpu(kvm, vcpu->vcpu_id - thr + arg); 1501 if (!tvcpu) 1502 break; 1503 if (!tvcpu->arch.doorbell_request) { 1504 tvcpu->arch.doorbell_request = 1; 1505 kvmppc_fast_vcpu_kick_hv(tvcpu); 1506 } 1507 break; 1508 case OP_31_XOP_MSGCLRP: 1509 arg = kvmppc_get_gpr(vcpu, rb); 1510 if (((arg >> 27) & 0x1f) != PPC_DBELL_SERVER) 1511 break; 1512 vcpu->arch.vcore->dpdes = 0; 1513 vcpu->arch.doorbell_request = 0; 1514 break; 1515 case OP_31_XOP_MFSPR: 1516 switch (get_sprn(inst)) { 1517 case SPRN_TIR: 1518 arg = thr; 1519 break; 1520 case SPRN_DPDES: 1521 arg = kvmppc_read_dpdes(vcpu); 1522 break; 1523 default: 1524 return EMULATE_FAIL; 1525 } 1526 kvmppc_set_gpr(vcpu, get_rt(inst), arg); 1527 break; 1528 default: 1529 return EMULATE_FAIL; 1530 } 1531 kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4); 1532 return RESUME_GUEST; 1533 } 1534 1535 /* 1536 * If the lppaca had pmcregs_in_use clear when we exited the guest, then 1537 * HFSCR_PM is cleared for next entry. If the guest then tries to access 1538 * the PMU SPRs, we get this facility unavailable interrupt. Putting HFSCR_PM 1539 * back in the guest HFSCR will cause the next entry to load the PMU SPRs and 1540 * allow the guest access to continue. 1541 */ 1542 static int kvmppc_pmu_unavailable(struct kvm_vcpu *vcpu) 1543 { 1544 if (!(vcpu->arch.hfscr_permitted & HFSCR_PM)) 1545 return EMULATE_FAIL; 1546 1547 kvmppc_set_hfscr_hv(vcpu, kvmppc_get_hfscr_hv(vcpu) | HFSCR_PM); 1548 1549 return RESUME_GUEST; 1550 } 1551 1552 static int kvmppc_ebb_unavailable(struct kvm_vcpu *vcpu) 1553 { 1554 if (!(vcpu->arch.hfscr_permitted & HFSCR_EBB)) 1555 return EMULATE_FAIL; 1556 1557 kvmppc_set_hfscr_hv(vcpu, kvmppc_get_hfscr_hv(vcpu) | HFSCR_EBB); 1558 1559 return RESUME_GUEST; 1560 } 1561 1562 static int kvmppc_tm_unavailable(struct kvm_vcpu *vcpu) 1563 { 1564 if (!(vcpu->arch.hfscr_permitted & HFSCR_TM)) 1565 return EMULATE_FAIL; 1566 1567 kvmppc_set_hfscr_hv(vcpu, kvmppc_get_hfscr_hv(vcpu) | HFSCR_TM); 1568 1569 return RESUME_GUEST; 1570 } 1571 1572 static int kvmppc_handle_exit_hv(struct kvm_vcpu *vcpu, 1573 struct task_struct *tsk) 1574 { 1575 struct kvm_run *run = vcpu->run; 1576 int r = RESUME_HOST; 1577 1578 vcpu->stat.sum_exits++; 1579 1580 /* 1581 * This can happen if an interrupt occurs in the last stages 1582 * of guest entry or the first stages of guest exit (i.e. after 1583 * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV 1584 * and before setting it to KVM_GUEST_MODE_HOST_HV). 1585 * That can happen due to a bug, or due to a machine check 1586 * occurring at just the wrong time. 1587 */ 1588 if (__kvmppc_get_msr_hv(vcpu) & MSR_HV) { 1589 printk(KERN_EMERG "KVM trap in HV mode!\n"); 1590 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n", 1591 vcpu->arch.trap, kvmppc_get_pc(vcpu), 1592 vcpu->arch.shregs.msr); 1593 kvmppc_dump_regs(vcpu); 1594 run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 1595 run->hw.hardware_exit_reason = vcpu->arch.trap; 1596 return RESUME_HOST; 1597 } 1598 run->exit_reason = KVM_EXIT_UNKNOWN; 1599 run->ready_for_interrupt_injection = 1; 1600 switch (vcpu->arch.trap) { 1601 /* We're good on these - the host merely wanted to get our attention */ 1602 case BOOK3S_INTERRUPT_NESTED_HV_DECREMENTER: 1603 WARN_ON_ONCE(1); /* Should never happen */ 1604 vcpu->arch.trap = BOOK3S_INTERRUPT_HV_DECREMENTER; 1605 fallthrough; 1606 case BOOK3S_INTERRUPT_HV_DECREMENTER: 1607 vcpu->stat.dec_exits++; 1608 r = RESUME_GUEST; 1609 break; 1610 case BOOK3S_INTERRUPT_EXTERNAL: 1611 case BOOK3S_INTERRUPT_H_DOORBELL: 1612 case BOOK3S_INTERRUPT_H_VIRT: 1613 vcpu->stat.ext_intr_exits++; 1614 r = RESUME_GUEST; 1615 break; 1616 /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/ 1617 case BOOK3S_INTERRUPT_HMI: 1618 case BOOK3S_INTERRUPT_PERFMON: 1619 case BOOK3S_INTERRUPT_SYSTEM_RESET: 1620 r = RESUME_GUEST; 1621 break; 1622 case BOOK3S_INTERRUPT_MACHINE_CHECK: { 1623 static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL, 1624 DEFAULT_RATELIMIT_BURST); 1625 /* 1626 * Print the MCE event to host console. Ratelimit so the guest 1627 * can't flood the host log. 1628 */ 1629 if (__ratelimit(&rs)) 1630 machine_check_print_event_info(&vcpu->arch.mce_evt,false, true); 1631 1632 /* 1633 * If the guest can do FWNMI, exit to userspace so it can 1634 * deliver a FWNMI to the guest. 1635 * Otherwise we synthesize a machine check for the guest 1636 * so that it knows that the machine check occurred. 1637 */ 1638 if (!vcpu->kvm->arch.fwnmi_enabled) { 1639 ulong flags = (__kvmppc_get_msr_hv(vcpu) & 0x083c0000) | 1640 (kvmppc_get_msr(vcpu) & SRR1_PREFIXED); 1641 kvmppc_core_queue_machine_check(vcpu, flags); 1642 r = RESUME_GUEST; 1643 break; 1644 } 1645 1646 /* Exit to guest with KVM_EXIT_NMI as exit reason */ 1647 run->exit_reason = KVM_EXIT_NMI; 1648 run->hw.hardware_exit_reason = vcpu->arch.trap; 1649 /* Clear out the old NMI status from run->flags */ 1650 run->flags &= ~KVM_RUN_PPC_NMI_DISP_MASK; 1651 /* Now set the NMI status */ 1652 if (vcpu->arch.mce_evt.disposition == MCE_DISPOSITION_RECOVERED) 1653 run->flags |= KVM_RUN_PPC_NMI_DISP_FULLY_RECOV; 1654 else 1655 run->flags |= KVM_RUN_PPC_NMI_DISP_NOT_RECOV; 1656 1657 r = RESUME_HOST; 1658 break; 1659 } 1660 case BOOK3S_INTERRUPT_PROGRAM: 1661 { 1662 ulong flags; 1663 /* 1664 * Normally program interrupts are delivered directly 1665 * to the guest by the hardware, but we can get here 1666 * as a result of a hypervisor emulation interrupt 1667 * (e40) getting turned into a 700 by BML RTAS. 1668 */ 1669 flags = (__kvmppc_get_msr_hv(vcpu) & 0x1f0000ull) | 1670 (kvmppc_get_msr(vcpu) & SRR1_PREFIXED); 1671 kvmppc_core_queue_program(vcpu, flags); 1672 r = RESUME_GUEST; 1673 break; 1674 } 1675 case BOOK3S_INTERRUPT_SYSCALL: 1676 { 1677 int i; 1678 1679 if (unlikely(__kvmppc_get_msr_hv(vcpu) & MSR_PR)) { 1680 /* 1681 * Guest userspace executed sc 1. This can only be 1682 * reached by the P9 path because the old path 1683 * handles this case in realmode hcall handlers. 1684 */ 1685 if (!kvmhv_vcpu_is_radix(vcpu)) { 1686 /* 1687 * A guest could be running PR KVM, so this 1688 * may be a PR KVM hcall. It must be reflected 1689 * to the guest kernel as a sc interrupt. 1690 */ 1691 kvmppc_core_queue_syscall(vcpu); 1692 } else { 1693 /* 1694 * Radix guests can not run PR KVM or nested HV 1695 * hash guests which might run PR KVM, so this 1696 * is always a privilege fault. Send a program 1697 * check to guest kernel. 1698 */ 1699 kvmppc_core_queue_program(vcpu, SRR1_PROGPRIV); 1700 } 1701 r = RESUME_GUEST; 1702 break; 1703 } 1704 1705 /* 1706 * hcall - gather args and set exit_reason. This will next be 1707 * handled by kvmppc_pseries_do_hcall which may be able to deal 1708 * with it and resume guest, or may punt to userspace. 1709 */ 1710 run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3); 1711 for (i = 0; i < 9; ++i) 1712 run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i); 1713 run->exit_reason = KVM_EXIT_PAPR_HCALL; 1714 vcpu->arch.hcall_needed = 1; 1715 r = RESUME_HOST; 1716 break; 1717 } 1718 /* 1719 * We get these next two if the guest accesses a page which it thinks 1720 * it has mapped but which is not actually present, either because 1721 * it is for an emulated I/O device or because the corresonding 1722 * host page has been paged out. 1723 * 1724 * Any other HDSI/HISI interrupts have been handled already for P7/8 1725 * guests. For POWER9 hash guests not using rmhandlers, basic hash 1726 * fault handling is done here. 1727 */ 1728 case BOOK3S_INTERRUPT_H_DATA_STORAGE: { 1729 unsigned long vsid; 1730 long err; 1731 1732 if (cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG) && 1733 unlikely(vcpu->arch.fault_dsisr == HDSISR_CANARY)) { 1734 r = RESUME_GUEST; /* Just retry if it's the canary */ 1735 break; 1736 } 1737 1738 if (kvm_is_radix(vcpu->kvm) || !cpu_has_feature(CPU_FTR_ARCH_300)) { 1739 /* 1740 * Radix doesn't require anything, and pre-ISAv3.0 hash 1741 * already attempted to handle this in rmhandlers. The 1742 * hash fault handling below is v3 only (it uses ASDR 1743 * via fault_gpa). 1744 */ 1745 r = RESUME_PAGE_FAULT; 1746 break; 1747 } 1748 1749 if (!(vcpu->arch.fault_dsisr & (DSISR_NOHPTE | DSISR_PROTFAULT))) { 1750 kvmppc_core_queue_data_storage(vcpu, 1751 kvmppc_get_msr(vcpu) & SRR1_PREFIXED, 1752 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); 1753 r = RESUME_GUEST; 1754 break; 1755 } 1756 1757 if (!(__kvmppc_get_msr_hv(vcpu) & MSR_DR)) 1758 vsid = vcpu->kvm->arch.vrma_slb_v; 1759 else 1760 vsid = vcpu->arch.fault_gpa; 1761 1762 err = kvmppc_hpte_hv_fault(vcpu, vcpu->arch.fault_dar, 1763 vsid, vcpu->arch.fault_dsisr, true); 1764 if (err == 0) { 1765 r = RESUME_GUEST; 1766 } else if (err == -1 || err == -2) { 1767 r = RESUME_PAGE_FAULT; 1768 } else { 1769 kvmppc_core_queue_data_storage(vcpu, 1770 kvmppc_get_msr(vcpu) & SRR1_PREFIXED, 1771 vcpu->arch.fault_dar, err); 1772 r = RESUME_GUEST; 1773 } 1774 break; 1775 } 1776 case BOOK3S_INTERRUPT_H_INST_STORAGE: { 1777 unsigned long vsid; 1778 long err; 1779 1780 vcpu->arch.fault_dar = kvmppc_get_pc(vcpu); 1781 vcpu->arch.fault_dsisr = __kvmppc_get_msr_hv(vcpu) & 1782 DSISR_SRR1_MATCH_64S; 1783 if (kvm_is_radix(vcpu->kvm) || !cpu_has_feature(CPU_FTR_ARCH_300)) { 1784 /* 1785 * Radix doesn't require anything, and pre-ISAv3.0 hash 1786 * already attempted to handle this in rmhandlers. The 1787 * hash fault handling below is v3 only (it uses ASDR 1788 * via fault_gpa). 1789 */ 1790 if (__kvmppc_get_msr_hv(vcpu) & HSRR1_HISI_WRITE) 1791 vcpu->arch.fault_dsisr |= DSISR_ISSTORE; 1792 r = RESUME_PAGE_FAULT; 1793 break; 1794 } 1795 1796 if (!(vcpu->arch.fault_dsisr & SRR1_ISI_NOPT)) { 1797 kvmppc_core_queue_inst_storage(vcpu, 1798 vcpu->arch.fault_dsisr | 1799 (kvmppc_get_msr(vcpu) & SRR1_PREFIXED)); 1800 r = RESUME_GUEST; 1801 break; 1802 } 1803 1804 if (!(__kvmppc_get_msr_hv(vcpu) & MSR_IR)) 1805 vsid = vcpu->kvm->arch.vrma_slb_v; 1806 else 1807 vsid = vcpu->arch.fault_gpa; 1808 1809 err = kvmppc_hpte_hv_fault(vcpu, vcpu->arch.fault_dar, 1810 vsid, vcpu->arch.fault_dsisr, false); 1811 if (err == 0) { 1812 r = RESUME_GUEST; 1813 } else if (err == -1) { 1814 r = RESUME_PAGE_FAULT; 1815 } else { 1816 kvmppc_core_queue_inst_storage(vcpu, 1817 err | (kvmppc_get_msr(vcpu) & SRR1_PREFIXED)); 1818 r = RESUME_GUEST; 1819 } 1820 break; 1821 } 1822 1823 /* 1824 * This occurs if the guest executes an illegal instruction. 1825 * If the guest debug is disabled, generate a program interrupt 1826 * to the guest. If guest debug is enabled, we need to check 1827 * whether the instruction is a software breakpoint instruction. 1828 * Accordingly return to Guest or Host. 1829 */ 1830 case BOOK3S_INTERRUPT_H_EMUL_ASSIST: 1831 if (vcpu->arch.emul_inst != KVM_INST_FETCH_FAILED) 1832 vcpu->arch.last_inst = kvmppc_need_byteswap(vcpu) ? 1833 swab32(vcpu->arch.emul_inst) : 1834 vcpu->arch.emul_inst; 1835 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) { 1836 r = kvmppc_emulate_debug_inst(vcpu); 1837 } else { 1838 kvmppc_core_queue_program(vcpu, SRR1_PROGILL | 1839 (kvmppc_get_msr(vcpu) & SRR1_PREFIXED)); 1840 r = RESUME_GUEST; 1841 } 1842 break; 1843 1844 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 1845 case BOOK3S_INTERRUPT_HV_SOFTPATCH: 1846 /* 1847 * This occurs for various TM-related instructions that 1848 * we need to emulate on POWER9 DD2.2. We have already 1849 * handled the cases where the guest was in real-suspend 1850 * mode and was transitioning to transactional state. 1851 */ 1852 r = kvmhv_p9_tm_emulation(vcpu); 1853 if (r != -1) 1854 break; 1855 fallthrough; /* go to facility unavailable handler */ 1856 #endif 1857 1858 /* 1859 * This occurs if the guest (kernel or userspace), does something that 1860 * is prohibited by HFSCR. 1861 * On POWER9, this could be a doorbell instruction that we need 1862 * to emulate. 1863 * Otherwise, we just generate a program interrupt to the guest. 1864 */ 1865 case BOOK3S_INTERRUPT_H_FAC_UNAVAIL: { 1866 u64 cause = kvmppc_get_hfscr_hv(vcpu) >> 56; 1867 1868 r = EMULATE_FAIL; 1869 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 1870 if (cause == FSCR_MSGP_LG) 1871 r = kvmppc_emulate_doorbell_instr(vcpu); 1872 if (cause == FSCR_PM_LG) 1873 r = kvmppc_pmu_unavailable(vcpu); 1874 if (cause == FSCR_EBB_LG) 1875 r = kvmppc_ebb_unavailable(vcpu); 1876 if (cause == FSCR_TM_LG) 1877 r = kvmppc_tm_unavailable(vcpu); 1878 } 1879 if (r == EMULATE_FAIL) { 1880 kvmppc_core_queue_program(vcpu, SRR1_PROGILL | 1881 (kvmppc_get_msr(vcpu) & SRR1_PREFIXED)); 1882 r = RESUME_GUEST; 1883 } 1884 break; 1885 } 1886 1887 case BOOK3S_INTERRUPT_HV_RM_HARD: 1888 r = RESUME_PASSTHROUGH; 1889 break; 1890 default: 1891 kvmppc_dump_regs(vcpu); 1892 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n", 1893 vcpu->arch.trap, kvmppc_get_pc(vcpu), 1894 __kvmppc_get_msr_hv(vcpu)); 1895 run->hw.hardware_exit_reason = vcpu->arch.trap; 1896 r = RESUME_HOST; 1897 break; 1898 } 1899 1900 return r; 1901 } 1902 1903 static int kvmppc_handle_nested_exit(struct kvm_vcpu *vcpu) 1904 { 1905 int r; 1906 int srcu_idx; 1907 1908 vcpu->stat.sum_exits++; 1909 1910 /* 1911 * This can happen if an interrupt occurs in the last stages 1912 * of guest entry or the first stages of guest exit (i.e. after 1913 * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV 1914 * and before setting it to KVM_GUEST_MODE_HOST_HV). 1915 * That can happen due to a bug, or due to a machine check 1916 * occurring at just the wrong time. 1917 */ 1918 if (__kvmppc_get_msr_hv(vcpu) & MSR_HV) { 1919 pr_emerg("KVM trap in HV mode while nested!\n"); 1920 pr_emerg("trap=0x%x | pc=0x%lx | msr=0x%llx\n", 1921 vcpu->arch.trap, kvmppc_get_pc(vcpu), 1922 __kvmppc_get_msr_hv(vcpu)); 1923 kvmppc_dump_regs(vcpu); 1924 return RESUME_HOST; 1925 } 1926 switch (vcpu->arch.trap) { 1927 /* We're good on these - the host merely wanted to get our attention */ 1928 case BOOK3S_INTERRUPT_HV_DECREMENTER: 1929 vcpu->stat.dec_exits++; 1930 r = RESUME_GUEST; 1931 break; 1932 case BOOK3S_INTERRUPT_EXTERNAL: 1933 vcpu->stat.ext_intr_exits++; 1934 r = RESUME_HOST; 1935 break; 1936 case BOOK3S_INTERRUPT_H_DOORBELL: 1937 case BOOK3S_INTERRUPT_H_VIRT: 1938 vcpu->stat.ext_intr_exits++; 1939 r = RESUME_GUEST; 1940 break; 1941 /* These need to go to the nested HV */ 1942 case BOOK3S_INTERRUPT_NESTED_HV_DECREMENTER: 1943 vcpu->arch.trap = BOOK3S_INTERRUPT_HV_DECREMENTER; 1944 vcpu->stat.dec_exits++; 1945 r = RESUME_HOST; 1946 break; 1947 /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/ 1948 case BOOK3S_INTERRUPT_HMI: 1949 case BOOK3S_INTERRUPT_PERFMON: 1950 case BOOK3S_INTERRUPT_SYSTEM_RESET: 1951 r = RESUME_GUEST; 1952 break; 1953 case BOOK3S_INTERRUPT_MACHINE_CHECK: 1954 { 1955 static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL, 1956 DEFAULT_RATELIMIT_BURST); 1957 /* Pass the machine check to the L1 guest */ 1958 r = RESUME_HOST; 1959 /* Print the MCE event to host console. */ 1960 if (__ratelimit(&rs)) 1961 machine_check_print_event_info(&vcpu->arch.mce_evt, false, true); 1962 break; 1963 } 1964 /* 1965 * We get these next two if the guest accesses a page which it thinks 1966 * it has mapped but which is not actually present, either because 1967 * it is for an emulated I/O device or because the corresonding 1968 * host page has been paged out. 1969 */ 1970 case BOOK3S_INTERRUPT_H_DATA_STORAGE: 1971 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 1972 r = kvmhv_nested_page_fault(vcpu); 1973 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 1974 break; 1975 case BOOK3S_INTERRUPT_H_INST_STORAGE: 1976 vcpu->arch.fault_dar = kvmppc_get_pc(vcpu); 1977 vcpu->arch.fault_dsisr = kvmppc_get_msr(vcpu) & 1978 DSISR_SRR1_MATCH_64S; 1979 if (__kvmppc_get_msr_hv(vcpu) & HSRR1_HISI_WRITE) 1980 vcpu->arch.fault_dsisr |= DSISR_ISSTORE; 1981 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 1982 r = kvmhv_nested_page_fault(vcpu); 1983 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 1984 break; 1985 1986 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 1987 case BOOK3S_INTERRUPT_HV_SOFTPATCH: 1988 /* 1989 * This occurs for various TM-related instructions that 1990 * we need to emulate on POWER9 DD2.2. We have already 1991 * handled the cases where the guest was in real-suspend 1992 * mode and was transitioning to transactional state. 1993 */ 1994 r = kvmhv_p9_tm_emulation(vcpu); 1995 if (r != -1) 1996 break; 1997 fallthrough; /* go to facility unavailable handler */ 1998 #endif 1999 2000 case BOOK3S_INTERRUPT_H_FAC_UNAVAIL: { 2001 u64 cause = vcpu->arch.hfscr >> 56; 2002 2003 /* 2004 * Only pass HFU interrupts to the L1 if the facility is 2005 * permitted but disabled by the L1's HFSCR, otherwise 2006 * the interrupt does not make sense to the L1 so turn 2007 * it into a HEAI. 2008 */ 2009 if (!(vcpu->arch.hfscr_permitted & (1UL << cause)) || 2010 (vcpu->arch.nested_hfscr & (1UL << cause))) { 2011 ppc_inst_t pinst; 2012 vcpu->arch.trap = BOOK3S_INTERRUPT_H_EMUL_ASSIST; 2013 2014 /* 2015 * If the fetch failed, return to guest and 2016 * try executing it again. 2017 */ 2018 r = kvmppc_get_last_inst(vcpu, INST_GENERIC, &pinst); 2019 vcpu->arch.emul_inst = ppc_inst_val(pinst); 2020 if (r != EMULATE_DONE) 2021 r = RESUME_GUEST; 2022 else 2023 r = RESUME_HOST; 2024 } else { 2025 r = RESUME_HOST; 2026 } 2027 2028 break; 2029 } 2030 2031 case BOOK3S_INTERRUPT_HV_RM_HARD: 2032 vcpu->arch.trap = 0; 2033 r = RESUME_GUEST; 2034 if (!xics_on_xive()) 2035 kvmppc_xics_rm_complete(vcpu, 0); 2036 break; 2037 case BOOK3S_INTERRUPT_SYSCALL: 2038 { 2039 unsigned long req = kvmppc_get_gpr(vcpu, 3); 2040 2041 /* 2042 * The H_RPT_INVALIDATE hcalls issued by nested 2043 * guests for process-scoped invalidations when 2044 * GTSE=0, are handled here in L0. 2045 */ 2046 if (req == H_RPT_INVALIDATE) { 2047 r = kvmppc_nested_h_rpt_invalidate(vcpu); 2048 break; 2049 } 2050 2051 r = RESUME_HOST; 2052 break; 2053 } 2054 default: 2055 r = RESUME_HOST; 2056 break; 2057 } 2058 2059 return r; 2060 } 2061 2062 static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu, 2063 struct kvm_sregs *sregs) 2064 { 2065 int i; 2066 2067 memset(sregs, 0, sizeof(struct kvm_sregs)); 2068 sregs->pvr = vcpu->arch.pvr; 2069 for (i = 0; i < vcpu->arch.slb_max; i++) { 2070 sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige; 2071 sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv; 2072 } 2073 2074 return 0; 2075 } 2076 2077 static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu, 2078 struct kvm_sregs *sregs) 2079 { 2080 int i, j; 2081 2082 /* Only accept the same PVR as the host's, since we can't spoof it */ 2083 if (sregs->pvr != vcpu->arch.pvr) 2084 return -EINVAL; 2085 2086 j = 0; 2087 for (i = 0; i < vcpu->arch.slb_nr; i++) { 2088 if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) { 2089 vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe; 2090 vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv; 2091 ++j; 2092 } 2093 } 2094 vcpu->arch.slb_max = j; 2095 2096 return 0; 2097 } 2098 2099 /* 2100 * Enforce limits on guest LPCR values based on hardware availability, 2101 * guest configuration, and possibly hypervisor support and security 2102 * concerns. 2103 */ 2104 unsigned long kvmppc_filter_lpcr_hv(struct kvm *kvm, unsigned long lpcr) 2105 { 2106 /* LPCR_TC only applies to HPT guests */ 2107 if (kvm_is_radix(kvm)) 2108 lpcr &= ~LPCR_TC; 2109 2110 /* On POWER8 and above, userspace can modify AIL */ 2111 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) 2112 lpcr &= ~LPCR_AIL; 2113 if ((lpcr & LPCR_AIL) != LPCR_AIL_3) 2114 lpcr &= ~LPCR_AIL; /* LPCR[AIL]=1/2 is disallowed */ 2115 /* 2116 * On some POWER9s we force AIL off for radix guests to prevent 2117 * executing in MSR[HV]=1 mode with the MMU enabled and PIDR set to 2118 * guest, which can result in Q0 translations with LPID=0 PID=PIDR to 2119 * be cached, which the host TLB management does not expect. 2120 */ 2121 if (kvm_is_radix(kvm) && cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG)) 2122 lpcr &= ~LPCR_AIL; 2123 2124 /* 2125 * On POWER9, allow userspace to enable large decrementer for the 2126 * guest, whether or not the host has it enabled. 2127 */ 2128 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 2129 lpcr &= ~LPCR_LD; 2130 2131 return lpcr; 2132 } 2133 2134 static void verify_lpcr(struct kvm *kvm, unsigned long lpcr) 2135 { 2136 if (lpcr != kvmppc_filter_lpcr_hv(kvm, lpcr)) { 2137 WARN_ONCE(1, "lpcr 0x%lx differs from filtered 0x%lx\n", 2138 lpcr, kvmppc_filter_lpcr_hv(kvm, lpcr)); 2139 } 2140 } 2141 2142 static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr, 2143 bool preserve_top32) 2144 { 2145 struct kvm *kvm = vcpu->kvm; 2146 struct kvmppc_vcore *vc = vcpu->arch.vcore; 2147 u64 mask; 2148 2149 spin_lock(&vc->lock); 2150 2151 /* 2152 * Userspace can only modify 2153 * DPFD (default prefetch depth), ILE (interrupt little-endian), 2154 * TC (translation control), AIL (alternate interrupt location), 2155 * LD (large decrementer). 2156 * These are subject to restrictions from kvmppc_filter_lcpr_hv(). 2157 */ 2158 mask = LPCR_DPFD | LPCR_ILE | LPCR_TC | LPCR_AIL | LPCR_LD; 2159 2160 /* Broken 32-bit version of LPCR must not clear top bits */ 2161 if (preserve_top32) 2162 mask &= 0xFFFFFFFF; 2163 2164 new_lpcr = kvmppc_filter_lpcr_hv(kvm, 2165 (vc->lpcr & ~mask) | (new_lpcr & mask)); 2166 2167 /* 2168 * If ILE (interrupt little-endian) has changed, update the 2169 * MSR_LE bit in the intr_msr for each vcpu in this vcore. 2170 */ 2171 if ((new_lpcr & LPCR_ILE) != (vc->lpcr & LPCR_ILE)) { 2172 struct kvm_vcpu *vcpu; 2173 unsigned long i; 2174 2175 kvm_for_each_vcpu(i, vcpu, kvm) { 2176 if (vcpu->arch.vcore != vc) 2177 continue; 2178 if (new_lpcr & LPCR_ILE) 2179 vcpu->arch.intr_msr |= MSR_LE; 2180 else 2181 vcpu->arch.intr_msr &= ~MSR_LE; 2182 } 2183 } 2184 2185 vc->lpcr = new_lpcr; 2186 2187 spin_unlock(&vc->lock); 2188 } 2189 2190 static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, 2191 union kvmppc_one_reg *val) 2192 { 2193 int r = 0; 2194 long int i; 2195 2196 switch (id) { 2197 case KVM_REG_PPC_DEBUG_INST: 2198 *val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT); 2199 break; 2200 case KVM_REG_PPC_HIOR: 2201 *val = get_reg_val(id, 0); 2202 break; 2203 case KVM_REG_PPC_DABR: 2204 *val = get_reg_val(id, vcpu->arch.dabr); 2205 break; 2206 case KVM_REG_PPC_DABRX: 2207 *val = get_reg_val(id, vcpu->arch.dabrx); 2208 break; 2209 case KVM_REG_PPC_DSCR: 2210 *val = get_reg_val(id, kvmppc_get_dscr_hv(vcpu)); 2211 break; 2212 case KVM_REG_PPC_PURR: 2213 *val = get_reg_val(id, kvmppc_get_purr_hv(vcpu)); 2214 break; 2215 case KVM_REG_PPC_SPURR: 2216 *val = get_reg_val(id, kvmppc_get_spurr_hv(vcpu)); 2217 break; 2218 case KVM_REG_PPC_AMR: 2219 *val = get_reg_val(id, kvmppc_get_amr_hv(vcpu)); 2220 break; 2221 case KVM_REG_PPC_UAMOR: 2222 *val = get_reg_val(id, kvmppc_get_uamor_hv(vcpu)); 2223 break; 2224 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCR1: 2225 i = id - KVM_REG_PPC_MMCR0; 2226 *val = get_reg_val(id, kvmppc_get_mmcr_hv(vcpu, i)); 2227 break; 2228 case KVM_REG_PPC_MMCR2: 2229 *val = get_reg_val(id, kvmppc_get_mmcr_hv(vcpu, 2)); 2230 break; 2231 case KVM_REG_PPC_MMCRA: 2232 *val = get_reg_val(id, kvmppc_get_mmcra_hv(vcpu)); 2233 break; 2234 case KVM_REG_PPC_MMCRS: 2235 *val = get_reg_val(id, vcpu->arch.mmcrs); 2236 break; 2237 case KVM_REG_PPC_MMCR3: 2238 *val = get_reg_val(id, kvmppc_get_mmcr_hv(vcpu, 3)); 2239 break; 2240 case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8: 2241 i = id - KVM_REG_PPC_PMC1; 2242 *val = get_reg_val(id, kvmppc_get_pmc_hv(vcpu, i)); 2243 break; 2244 case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2: 2245 i = id - KVM_REG_PPC_SPMC1; 2246 *val = get_reg_val(id, vcpu->arch.spmc[i]); 2247 break; 2248 case KVM_REG_PPC_SIAR: 2249 *val = get_reg_val(id, kvmppc_get_siar_hv(vcpu)); 2250 break; 2251 case KVM_REG_PPC_SDAR: 2252 *val = get_reg_val(id, kvmppc_get_sdar_hv(vcpu)); 2253 break; 2254 case KVM_REG_PPC_SIER: 2255 *val = get_reg_val(id, kvmppc_get_sier_hv(vcpu, 0)); 2256 break; 2257 case KVM_REG_PPC_SIER2: 2258 *val = get_reg_val(id, kvmppc_get_sier_hv(vcpu, 1)); 2259 break; 2260 case KVM_REG_PPC_SIER3: 2261 *val = get_reg_val(id, kvmppc_get_sier_hv(vcpu, 2)); 2262 break; 2263 case KVM_REG_PPC_IAMR: 2264 *val = get_reg_val(id, kvmppc_get_iamr_hv(vcpu)); 2265 break; 2266 case KVM_REG_PPC_PSPB: 2267 *val = get_reg_val(id, kvmppc_get_pspb_hv(vcpu)); 2268 break; 2269 case KVM_REG_PPC_DPDES: 2270 /* 2271 * On POWER9, where we are emulating msgsndp etc., 2272 * we return 1 bit for each vcpu, which can come from 2273 * either vcore->dpdes or doorbell_request. 2274 * On POWER8, doorbell_request is 0. 2275 */ 2276 if (cpu_has_feature(CPU_FTR_ARCH_300)) 2277 *val = get_reg_val(id, vcpu->arch.doorbell_request); 2278 else 2279 *val = get_reg_val(id, vcpu->arch.vcore->dpdes); 2280 break; 2281 case KVM_REG_PPC_VTB: 2282 *val = get_reg_val(id, vcpu->arch.vcore->vtb); 2283 break; 2284 case KVM_REG_PPC_DAWR: 2285 *val = get_reg_val(id, kvmppc_get_dawr0_hv(vcpu)); 2286 break; 2287 case KVM_REG_PPC_DAWRX: 2288 *val = get_reg_val(id, kvmppc_get_dawrx0_hv(vcpu)); 2289 break; 2290 case KVM_REG_PPC_DAWR1: 2291 *val = get_reg_val(id, kvmppc_get_dawr1_hv(vcpu)); 2292 break; 2293 case KVM_REG_PPC_DAWRX1: 2294 *val = get_reg_val(id, kvmppc_get_dawrx1_hv(vcpu)); 2295 break; 2296 case KVM_REG_PPC_CIABR: 2297 *val = get_reg_val(id, kvmppc_get_ciabr_hv(vcpu)); 2298 break; 2299 case KVM_REG_PPC_CSIGR: 2300 *val = get_reg_val(id, vcpu->arch.csigr); 2301 break; 2302 case KVM_REG_PPC_TACR: 2303 *val = get_reg_val(id, vcpu->arch.tacr); 2304 break; 2305 case KVM_REG_PPC_TCSCR: 2306 *val = get_reg_val(id, vcpu->arch.tcscr); 2307 break; 2308 case KVM_REG_PPC_PID: 2309 *val = get_reg_val(id, vcpu->arch.pid); 2310 break; 2311 case KVM_REG_PPC_ACOP: 2312 *val = get_reg_val(id, vcpu->arch.acop); 2313 break; 2314 case KVM_REG_PPC_WORT: 2315 *val = get_reg_val(id, kvmppc_get_wort_hv(vcpu)); 2316 break; 2317 case KVM_REG_PPC_TIDR: 2318 *val = get_reg_val(id, vcpu->arch.tid); 2319 break; 2320 case KVM_REG_PPC_PSSCR: 2321 *val = get_reg_val(id, vcpu->arch.psscr); 2322 break; 2323 case KVM_REG_PPC_VPA_ADDR: 2324 spin_lock(&vcpu->arch.vpa_update_lock); 2325 *val = get_reg_val(id, vcpu->arch.vpa.next_gpa); 2326 spin_unlock(&vcpu->arch.vpa_update_lock); 2327 break; 2328 case KVM_REG_PPC_VPA_SLB: 2329 spin_lock(&vcpu->arch.vpa_update_lock); 2330 val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa; 2331 val->vpaval.length = vcpu->arch.slb_shadow.len; 2332 spin_unlock(&vcpu->arch.vpa_update_lock); 2333 break; 2334 case KVM_REG_PPC_VPA_DTL: 2335 spin_lock(&vcpu->arch.vpa_update_lock); 2336 val->vpaval.addr = vcpu->arch.dtl.next_gpa; 2337 val->vpaval.length = vcpu->arch.dtl.len; 2338 spin_unlock(&vcpu->arch.vpa_update_lock); 2339 break; 2340 case KVM_REG_PPC_TB_OFFSET: 2341 *val = get_reg_val(id, vcpu->arch.vcore->tb_offset); 2342 break; 2343 case KVM_REG_PPC_LPCR: 2344 case KVM_REG_PPC_LPCR_64: 2345 *val = get_reg_val(id, vcpu->arch.vcore->lpcr); 2346 break; 2347 case KVM_REG_PPC_PPR: 2348 *val = get_reg_val(id, kvmppc_get_ppr_hv(vcpu)); 2349 break; 2350 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 2351 case KVM_REG_PPC_TFHAR: 2352 *val = get_reg_val(id, vcpu->arch.tfhar); 2353 break; 2354 case KVM_REG_PPC_TFIAR: 2355 *val = get_reg_val(id, vcpu->arch.tfiar); 2356 break; 2357 case KVM_REG_PPC_TEXASR: 2358 *val = get_reg_val(id, vcpu->arch.texasr); 2359 break; 2360 case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31: 2361 i = id - KVM_REG_PPC_TM_GPR0; 2362 *val = get_reg_val(id, vcpu->arch.gpr_tm[i]); 2363 break; 2364 case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63: 2365 { 2366 int j; 2367 i = id - KVM_REG_PPC_TM_VSR0; 2368 if (i < 32) 2369 for (j = 0; j < TS_FPRWIDTH; j++) 2370 val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j]; 2371 else { 2372 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 2373 val->vval = vcpu->arch.vr_tm.vr[i-32]; 2374 else 2375 r = -ENXIO; 2376 } 2377 break; 2378 } 2379 case KVM_REG_PPC_TM_CR: 2380 *val = get_reg_val(id, vcpu->arch.cr_tm); 2381 break; 2382 case KVM_REG_PPC_TM_XER: 2383 *val = get_reg_val(id, vcpu->arch.xer_tm); 2384 break; 2385 case KVM_REG_PPC_TM_LR: 2386 *val = get_reg_val(id, vcpu->arch.lr_tm); 2387 break; 2388 case KVM_REG_PPC_TM_CTR: 2389 *val = get_reg_val(id, vcpu->arch.ctr_tm); 2390 break; 2391 case KVM_REG_PPC_TM_FPSCR: 2392 *val = get_reg_val(id, vcpu->arch.fp_tm.fpscr); 2393 break; 2394 case KVM_REG_PPC_TM_AMR: 2395 *val = get_reg_val(id, vcpu->arch.amr_tm); 2396 break; 2397 case KVM_REG_PPC_TM_PPR: 2398 *val = get_reg_val(id, vcpu->arch.ppr_tm); 2399 break; 2400 case KVM_REG_PPC_TM_VRSAVE: 2401 *val = get_reg_val(id, vcpu->arch.vrsave_tm); 2402 break; 2403 case KVM_REG_PPC_TM_VSCR: 2404 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 2405 *val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]); 2406 else 2407 r = -ENXIO; 2408 break; 2409 case KVM_REG_PPC_TM_DSCR: 2410 *val = get_reg_val(id, vcpu->arch.dscr_tm); 2411 break; 2412 case KVM_REG_PPC_TM_TAR: 2413 *val = get_reg_val(id, vcpu->arch.tar_tm); 2414 break; 2415 #endif 2416 case KVM_REG_PPC_ARCH_COMPAT: 2417 *val = get_reg_val(id, vcpu->arch.vcore->arch_compat); 2418 break; 2419 case KVM_REG_PPC_DEC_EXPIRY: 2420 *val = get_reg_val(id, vcpu->arch.dec_expires); 2421 break; 2422 case KVM_REG_PPC_ONLINE: 2423 *val = get_reg_val(id, vcpu->arch.online); 2424 break; 2425 case KVM_REG_PPC_PTCR: 2426 *val = get_reg_val(id, vcpu->kvm->arch.l1_ptcr); 2427 break; 2428 case KVM_REG_PPC_FSCR: 2429 *val = get_reg_val(id, kvmppc_get_fscr_hv(vcpu)); 2430 break; 2431 default: 2432 r = -EINVAL; 2433 break; 2434 } 2435 2436 return r; 2437 } 2438 2439 static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, 2440 union kvmppc_one_reg *val) 2441 { 2442 int r = 0; 2443 long int i; 2444 unsigned long addr, len; 2445 2446 switch (id) { 2447 case KVM_REG_PPC_HIOR: 2448 /* Only allow this to be set to zero */ 2449 if (set_reg_val(id, *val)) 2450 r = -EINVAL; 2451 break; 2452 case KVM_REG_PPC_DABR: 2453 vcpu->arch.dabr = set_reg_val(id, *val); 2454 break; 2455 case KVM_REG_PPC_DABRX: 2456 vcpu->arch.dabrx = set_reg_val(id, *val) & ~DABRX_HYP; 2457 break; 2458 case KVM_REG_PPC_DSCR: 2459 kvmppc_set_dscr_hv(vcpu, set_reg_val(id, *val)); 2460 break; 2461 case KVM_REG_PPC_PURR: 2462 kvmppc_set_purr_hv(vcpu, set_reg_val(id, *val)); 2463 break; 2464 case KVM_REG_PPC_SPURR: 2465 kvmppc_set_spurr_hv(vcpu, set_reg_val(id, *val)); 2466 break; 2467 case KVM_REG_PPC_AMR: 2468 kvmppc_set_amr_hv(vcpu, set_reg_val(id, *val)); 2469 break; 2470 case KVM_REG_PPC_UAMOR: 2471 kvmppc_set_uamor_hv(vcpu, set_reg_val(id, *val)); 2472 break; 2473 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCR1: 2474 i = id - KVM_REG_PPC_MMCR0; 2475 kvmppc_set_mmcr_hv(vcpu, i, set_reg_val(id, *val)); 2476 break; 2477 case KVM_REG_PPC_MMCR2: 2478 kvmppc_set_mmcr_hv(vcpu, 2, set_reg_val(id, *val)); 2479 break; 2480 case KVM_REG_PPC_MMCRA: 2481 kvmppc_set_mmcra_hv(vcpu, set_reg_val(id, *val)); 2482 break; 2483 case KVM_REG_PPC_MMCRS: 2484 vcpu->arch.mmcrs = set_reg_val(id, *val); 2485 break; 2486 case KVM_REG_PPC_MMCR3: 2487 kvmppc_set_mmcr_hv(vcpu, 3, set_reg_val(id, *val)); 2488 break; 2489 case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8: 2490 i = id - KVM_REG_PPC_PMC1; 2491 kvmppc_set_pmc_hv(vcpu, i, set_reg_val(id, *val)); 2492 break; 2493 case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2: 2494 i = id - KVM_REG_PPC_SPMC1; 2495 vcpu->arch.spmc[i] = set_reg_val(id, *val); 2496 break; 2497 case KVM_REG_PPC_SIAR: 2498 kvmppc_set_siar_hv(vcpu, set_reg_val(id, *val)); 2499 break; 2500 case KVM_REG_PPC_SDAR: 2501 kvmppc_set_sdar_hv(vcpu, set_reg_val(id, *val)); 2502 break; 2503 case KVM_REG_PPC_SIER: 2504 kvmppc_set_sier_hv(vcpu, 0, set_reg_val(id, *val)); 2505 break; 2506 case KVM_REG_PPC_SIER2: 2507 kvmppc_set_sier_hv(vcpu, 1, set_reg_val(id, *val)); 2508 break; 2509 case KVM_REG_PPC_SIER3: 2510 kvmppc_set_sier_hv(vcpu, 2, set_reg_val(id, *val)); 2511 break; 2512 case KVM_REG_PPC_IAMR: 2513 kvmppc_set_iamr_hv(vcpu, set_reg_val(id, *val)); 2514 break; 2515 case KVM_REG_PPC_PSPB: 2516 kvmppc_set_pspb_hv(vcpu, set_reg_val(id, *val)); 2517 break; 2518 case KVM_REG_PPC_DPDES: 2519 if (cpu_has_feature(CPU_FTR_ARCH_300)) 2520 vcpu->arch.doorbell_request = set_reg_val(id, *val) & 1; 2521 else 2522 vcpu->arch.vcore->dpdes = set_reg_val(id, *val); 2523 break; 2524 case KVM_REG_PPC_VTB: 2525 vcpu->arch.vcore->vtb = set_reg_val(id, *val); 2526 break; 2527 case KVM_REG_PPC_DAWR: 2528 kvmppc_set_dawr0_hv(vcpu, set_reg_val(id, *val)); 2529 break; 2530 case KVM_REG_PPC_DAWRX: 2531 kvmppc_set_dawrx0_hv(vcpu, set_reg_val(id, *val) & ~DAWRX_HYP); 2532 break; 2533 case KVM_REG_PPC_DAWR1: 2534 kvmppc_set_dawr1_hv(vcpu, set_reg_val(id, *val)); 2535 break; 2536 case KVM_REG_PPC_DAWRX1: 2537 kvmppc_set_dawrx1_hv(vcpu, set_reg_val(id, *val) & ~DAWRX_HYP); 2538 break; 2539 case KVM_REG_PPC_CIABR: 2540 kvmppc_set_ciabr_hv(vcpu, set_reg_val(id, *val)); 2541 /* Don't allow setting breakpoints in hypervisor code */ 2542 if ((kvmppc_get_ciabr_hv(vcpu) & CIABR_PRIV) == CIABR_PRIV_HYPER) 2543 kvmppc_set_ciabr_hv(vcpu, kvmppc_get_ciabr_hv(vcpu) & ~CIABR_PRIV); 2544 break; 2545 case KVM_REG_PPC_CSIGR: 2546 vcpu->arch.csigr = set_reg_val(id, *val); 2547 break; 2548 case KVM_REG_PPC_TACR: 2549 vcpu->arch.tacr = set_reg_val(id, *val); 2550 break; 2551 case KVM_REG_PPC_TCSCR: 2552 vcpu->arch.tcscr = set_reg_val(id, *val); 2553 break; 2554 case KVM_REG_PPC_PID: 2555 vcpu->arch.pid = set_reg_val(id, *val); 2556 break; 2557 case KVM_REG_PPC_ACOP: 2558 vcpu->arch.acop = set_reg_val(id, *val); 2559 break; 2560 case KVM_REG_PPC_WORT: 2561 kvmppc_set_wort_hv(vcpu, set_reg_val(id, *val)); 2562 break; 2563 case KVM_REG_PPC_TIDR: 2564 vcpu->arch.tid = set_reg_val(id, *val); 2565 break; 2566 case KVM_REG_PPC_PSSCR: 2567 vcpu->arch.psscr = set_reg_val(id, *val) & PSSCR_GUEST_VIS; 2568 break; 2569 case KVM_REG_PPC_VPA_ADDR: 2570 addr = set_reg_val(id, *val); 2571 r = -EINVAL; 2572 if (!addr && (vcpu->arch.slb_shadow.next_gpa || 2573 vcpu->arch.dtl.next_gpa)) 2574 break; 2575 r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca)); 2576 break; 2577 case KVM_REG_PPC_VPA_SLB: 2578 addr = val->vpaval.addr; 2579 len = val->vpaval.length; 2580 r = -EINVAL; 2581 if (addr && !vcpu->arch.vpa.next_gpa) 2582 break; 2583 r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len); 2584 break; 2585 case KVM_REG_PPC_VPA_DTL: 2586 addr = val->vpaval.addr; 2587 len = val->vpaval.length; 2588 r = -EINVAL; 2589 if (addr && (len < sizeof(struct dtl_entry) || 2590 !vcpu->arch.vpa.next_gpa)) 2591 break; 2592 len -= len % sizeof(struct dtl_entry); 2593 r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len); 2594 break; 2595 case KVM_REG_PPC_TB_OFFSET: 2596 { 2597 /* round up to multiple of 2^24 */ 2598 u64 tb_offset = ALIGN(set_reg_val(id, *val), 1UL << 24); 2599 2600 /* 2601 * Now that we know the timebase offset, update the 2602 * decrementer expiry with a guest timebase value. If 2603 * the userspace does not set DEC_EXPIRY, this ensures 2604 * a migrated vcpu at least starts with an expired 2605 * decrementer, which is better than a large one that 2606 * causes a hang. 2607 */ 2608 if (!vcpu->arch.dec_expires && tb_offset) 2609 vcpu->arch.dec_expires = get_tb() + tb_offset; 2610 2611 vcpu->arch.vcore->tb_offset = tb_offset; 2612 break; 2613 } 2614 case KVM_REG_PPC_LPCR: 2615 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), true); 2616 break; 2617 case KVM_REG_PPC_LPCR_64: 2618 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), false); 2619 break; 2620 case KVM_REG_PPC_PPR: 2621 kvmppc_set_ppr_hv(vcpu, set_reg_val(id, *val)); 2622 break; 2623 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 2624 case KVM_REG_PPC_TFHAR: 2625 vcpu->arch.tfhar = set_reg_val(id, *val); 2626 break; 2627 case KVM_REG_PPC_TFIAR: 2628 vcpu->arch.tfiar = set_reg_val(id, *val); 2629 break; 2630 case KVM_REG_PPC_TEXASR: 2631 vcpu->arch.texasr = set_reg_val(id, *val); 2632 break; 2633 case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31: 2634 i = id - KVM_REG_PPC_TM_GPR0; 2635 vcpu->arch.gpr_tm[i] = set_reg_val(id, *val); 2636 break; 2637 case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63: 2638 { 2639 int j; 2640 i = id - KVM_REG_PPC_TM_VSR0; 2641 if (i < 32) 2642 for (j = 0; j < TS_FPRWIDTH; j++) 2643 vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j]; 2644 else 2645 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 2646 vcpu->arch.vr_tm.vr[i-32] = val->vval; 2647 else 2648 r = -ENXIO; 2649 break; 2650 } 2651 case KVM_REG_PPC_TM_CR: 2652 vcpu->arch.cr_tm = set_reg_val(id, *val); 2653 break; 2654 case KVM_REG_PPC_TM_XER: 2655 vcpu->arch.xer_tm = set_reg_val(id, *val); 2656 break; 2657 case KVM_REG_PPC_TM_LR: 2658 vcpu->arch.lr_tm = set_reg_val(id, *val); 2659 break; 2660 case KVM_REG_PPC_TM_CTR: 2661 vcpu->arch.ctr_tm = set_reg_val(id, *val); 2662 break; 2663 case KVM_REG_PPC_TM_FPSCR: 2664 vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val); 2665 break; 2666 case KVM_REG_PPC_TM_AMR: 2667 vcpu->arch.amr_tm = set_reg_val(id, *val); 2668 break; 2669 case KVM_REG_PPC_TM_PPR: 2670 vcpu->arch.ppr_tm = set_reg_val(id, *val); 2671 break; 2672 case KVM_REG_PPC_TM_VRSAVE: 2673 vcpu->arch.vrsave_tm = set_reg_val(id, *val); 2674 break; 2675 case KVM_REG_PPC_TM_VSCR: 2676 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 2677 vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val); 2678 else 2679 r = - ENXIO; 2680 break; 2681 case KVM_REG_PPC_TM_DSCR: 2682 vcpu->arch.dscr_tm = set_reg_val(id, *val); 2683 break; 2684 case KVM_REG_PPC_TM_TAR: 2685 vcpu->arch.tar_tm = set_reg_val(id, *val); 2686 break; 2687 #endif 2688 case KVM_REG_PPC_ARCH_COMPAT: 2689 r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val)); 2690 break; 2691 case KVM_REG_PPC_DEC_EXPIRY: 2692 vcpu->arch.dec_expires = set_reg_val(id, *val); 2693 break; 2694 case KVM_REG_PPC_ONLINE: 2695 i = set_reg_val(id, *val); 2696 if (i && !vcpu->arch.online) 2697 atomic_inc(&vcpu->arch.vcore->online_count); 2698 else if (!i && vcpu->arch.online) 2699 atomic_dec(&vcpu->arch.vcore->online_count); 2700 vcpu->arch.online = i; 2701 break; 2702 case KVM_REG_PPC_PTCR: 2703 vcpu->kvm->arch.l1_ptcr = set_reg_val(id, *val); 2704 break; 2705 case KVM_REG_PPC_FSCR: 2706 kvmppc_set_fscr_hv(vcpu, set_reg_val(id, *val)); 2707 break; 2708 default: 2709 r = -EINVAL; 2710 break; 2711 } 2712 2713 return r; 2714 } 2715 2716 /* 2717 * On POWER9, threads are independent and can be in different partitions. 2718 * Therefore we consider each thread to be a subcore. 2719 * There is a restriction that all threads have to be in the same 2720 * MMU mode (radix or HPT), unfortunately, but since we only support 2721 * HPT guests on a HPT host so far, that isn't an impediment yet. 2722 */ 2723 static int threads_per_vcore(struct kvm *kvm) 2724 { 2725 if (cpu_has_feature(CPU_FTR_ARCH_300)) 2726 return 1; 2727 return threads_per_subcore; 2728 } 2729 2730 static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int id) 2731 { 2732 struct kvmppc_vcore *vcore; 2733 2734 vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL); 2735 2736 if (vcore == NULL) 2737 return NULL; 2738 2739 spin_lock_init(&vcore->lock); 2740 spin_lock_init(&vcore->stoltb_lock); 2741 rcuwait_init(&vcore->wait); 2742 vcore->preempt_tb = TB_NIL; 2743 vcore->lpcr = kvm->arch.lpcr; 2744 vcore->first_vcpuid = id; 2745 vcore->kvm = kvm; 2746 INIT_LIST_HEAD(&vcore->preempt_list); 2747 2748 return vcore; 2749 } 2750 2751 #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING 2752 static struct debugfs_timings_element { 2753 const char *name; 2754 size_t offset; 2755 } timings[] = { 2756 #ifdef CONFIG_KVM_BOOK3S_HV_P9_TIMING 2757 {"vcpu_entry", offsetof(struct kvm_vcpu, arch.vcpu_entry)}, 2758 {"guest_entry", offsetof(struct kvm_vcpu, arch.guest_entry)}, 2759 {"in_guest", offsetof(struct kvm_vcpu, arch.in_guest)}, 2760 {"guest_exit", offsetof(struct kvm_vcpu, arch.guest_exit)}, 2761 {"vcpu_exit", offsetof(struct kvm_vcpu, arch.vcpu_exit)}, 2762 {"hypercall", offsetof(struct kvm_vcpu, arch.hcall)}, 2763 {"page_fault", offsetof(struct kvm_vcpu, arch.pg_fault)}, 2764 #else 2765 {"rm_entry", offsetof(struct kvm_vcpu, arch.rm_entry)}, 2766 {"rm_intr", offsetof(struct kvm_vcpu, arch.rm_intr)}, 2767 {"rm_exit", offsetof(struct kvm_vcpu, arch.rm_exit)}, 2768 {"guest", offsetof(struct kvm_vcpu, arch.guest_time)}, 2769 {"cede", offsetof(struct kvm_vcpu, arch.cede_time)}, 2770 #endif 2771 }; 2772 2773 #define N_TIMINGS (ARRAY_SIZE(timings)) 2774 2775 struct debugfs_timings_state { 2776 struct kvm_vcpu *vcpu; 2777 unsigned int buflen; 2778 char buf[N_TIMINGS * 100]; 2779 }; 2780 2781 static int debugfs_timings_open(struct inode *inode, struct file *file) 2782 { 2783 struct kvm_vcpu *vcpu = inode->i_private; 2784 struct debugfs_timings_state *p; 2785 2786 p = kzalloc(sizeof(*p), GFP_KERNEL); 2787 if (!p) 2788 return -ENOMEM; 2789 2790 kvm_get_kvm(vcpu->kvm); 2791 p->vcpu = vcpu; 2792 file->private_data = p; 2793 2794 return nonseekable_open(inode, file); 2795 } 2796 2797 static int debugfs_timings_release(struct inode *inode, struct file *file) 2798 { 2799 struct debugfs_timings_state *p = file->private_data; 2800 2801 kvm_put_kvm(p->vcpu->kvm); 2802 kfree(p); 2803 return 0; 2804 } 2805 2806 static ssize_t debugfs_timings_read(struct file *file, char __user *buf, 2807 size_t len, loff_t *ppos) 2808 { 2809 struct debugfs_timings_state *p = file->private_data; 2810 struct kvm_vcpu *vcpu = p->vcpu; 2811 char *s, *buf_end; 2812 struct kvmhv_tb_accumulator tb; 2813 u64 count; 2814 loff_t pos; 2815 ssize_t n; 2816 int i, loops; 2817 bool ok; 2818 2819 if (!p->buflen) { 2820 s = p->buf; 2821 buf_end = s + sizeof(p->buf); 2822 for (i = 0; i < N_TIMINGS; ++i) { 2823 struct kvmhv_tb_accumulator *acc; 2824 2825 acc = (struct kvmhv_tb_accumulator *) 2826 ((unsigned long)vcpu + timings[i].offset); 2827 ok = false; 2828 for (loops = 0; loops < 1000; ++loops) { 2829 count = acc->seqcount; 2830 if (!(count & 1)) { 2831 smp_rmb(); 2832 tb = *acc; 2833 smp_rmb(); 2834 if (count == acc->seqcount) { 2835 ok = true; 2836 break; 2837 } 2838 } 2839 udelay(1); 2840 } 2841 if (!ok) 2842 snprintf(s, buf_end - s, "%s: stuck\n", 2843 timings[i].name); 2844 else 2845 snprintf(s, buf_end - s, 2846 "%s: %llu %llu %llu %llu\n", 2847 timings[i].name, count / 2, 2848 tb_to_ns(tb.tb_total), 2849 tb_to_ns(tb.tb_min), 2850 tb_to_ns(tb.tb_max)); 2851 s += strlen(s); 2852 } 2853 p->buflen = s - p->buf; 2854 } 2855 2856 pos = *ppos; 2857 if (pos >= p->buflen) 2858 return 0; 2859 if (len > p->buflen - pos) 2860 len = p->buflen - pos; 2861 n = copy_to_user(buf, p->buf + pos, len); 2862 if (n) { 2863 if (n == len) 2864 return -EFAULT; 2865 len -= n; 2866 } 2867 *ppos = pos + len; 2868 return len; 2869 } 2870 2871 static ssize_t debugfs_timings_write(struct file *file, const char __user *buf, 2872 size_t len, loff_t *ppos) 2873 { 2874 return -EACCES; 2875 } 2876 2877 static const struct file_operations debugfs_timings_ops = { 2878 .owner = THIS_MODULE, 2879 .open = debugfs_timings_open, 2880 .release = debugfs_timings_release, 2881 .read = debugfs_timings_read, 2882 .write = debugfs_timings_write, 2883 .llseek = generic_file_llseek, 2884 }; 2885 2886 /* Create a debugfs directory for the vcpu */ 2887 static int kvmppc_arch_create_vcpu_debugfs_hv(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry) 2888 { 2889 if (cpu_has_feature(CPU_FTR_ARCH_300) == IS_ENABLED(CONFIG_KVM_BOOK3S_HV_P9_TIMING)) 2890 debugfs_create_file("timings", 0444, debugfs_dentry, vcpu, 2891 &debugfs_timings_ops); 2892 return 0; 2893 } 2894 2895 #else /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ 2896 static int kvmppc_arch_create_vcpu_debugfs_hv(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry) 2897 { 2898 return 0; 2899 } 2900 #endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ 2901 2902 static int kvmppc_core_vcpu_create_hv(struct kvm_vcpu *vcpu) 2903 { 2904 int err; 2905 int core; 2906 struct kvmppc_vcore *vcore; 2907 struct kvm *kvm; 2908 unsigned int id; 2909 2910 kvm = vcpu->kvm; 2911 id = vcpu->vcpu_id; 2912 2913 vcpu->arch.shared = &vcpu->arch.shregs; 2914 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE 2915 /* 2916 * The shared struct is never shared on HV, 2917 * so we can always use host endianness 2918 */ 2919 #ifdef __BIG_ENDIAN__ 2920 vcpu->arch.shared_big_endian = true; 2921 #else 2922 vcpu->arch.shared_big_endian = false; 2923 #endif 2924 #endif 2925 kvmppc_set_mmcr_hv(vcpu, 0, MMCR0_FC); 2926 2927 if (cpu_has_feature(CPU_FTR_ARCH_31)) { 2928 kvmppc_set_mmcr_hv(vcpu, 0, kvmppc_get_mmcr_hv(vcpu, 0) | MMCR0_PMCCEXT); 2929 kvmppc_set_mmcra_hv(vcpu, MMCRA_BHRB_DISABLE); 2930 } 2931 2932 kvmppc_set_ctrl_hv(vcpu, CTRL_RUNLATCH); 2933 /* default to host PVR, since we can't spoof it */ 2934 kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR)); 2935 spin_lock_init(&vcpu->arch.vpa_update_lock); 2936 spin_lock_init(&vcpu->arch.tbacct_lock); 2937 vcpu->arch.busy_preempt = TB_NIL; 2938 __kvmppc_set_msr_hv(vcpu, MSR_ME); 2939 vcpu->arch.intr_msr = MSR_SF | MSR_ME; 2940 2941 /* 2942 * Set the default HFSCR for the guest from the host value. 2943 * This value is only used on POWER9 and later. 2944 * On >= POWER9, we want to virtualize the doorbell facility, so we 2945 * don't set the HFSCR_MSGP bit, and that causes those instructions 2946 * to trap and then we emulate them. 2947 */ 2948 kvmppc_set_hfscr_hv(vcpu, HFSCR_TAR | HFSCR_EBB | HFSCR_PM | HFSCR_BHRB | 2949 HFSCR_DSCR | HFSCR_VECVSX | HFSCR_FP); 2950 2951 /* On POWER10 and later, allow prefixed instructions */ 2952 if (cpu_has_feature(CPU_FTR_ARCH_31)) 2953 kvmppc_set_hfscr_hv(vcpu, kvmppc_get_hfscr_hv(vcpu) | HFSCR_PREFIX); 2954 2955 if (cpu_has_feature(CPU_FTR_HVMODE)) { 2956 kvmppc_set_hfscr_hv(vcpu, kvmppc_get_hfscr_hv(vcpu) & mfspr(SPRN_HFSCR)); 2957 2958 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 2959 if (cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) 2960 kvmppc_set_hfscr_hv(vcpu, kvmppc_get_hfscr_hv(vcpu) | HFSCR_TM); 2961 #endif 2962 } 2963 if (cpu_has_feature(CPU_FTR_TM_COMP)) 2964 vcpu->arch.hfscr |= HFSCR_TM; 2965 2966 vcpu->arch.hfscr_permitted = kvmppc_get_hfscr_hv(vcpu); 2967 2968 /* 2969 * PM, EBB, TM are demand-faulted so start with it clear. 2970 */ 2971 kvmppc_set_hfscr_hv(vcpu, kvmppc_get_hfscr_hv(vcpu) & ~(HFSCR_PM | HFSCR_EBB | HFSCR_TM)); 2972 2973 kvmppc_mmu_book3s_hv_init(vcpu); 2974 2975 vcpu->arch.state = KVMPPC_VCPU_NOTREADY; 2976 2977 init_waitqueue_head(&vcpu->arch.cpu_run); 2978 2979 mutex_lock(&kvm->lock); 2980 vcore = NULL; 2981 err = -EINVAL; 2982 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 2983 if (id >= (KVM_MAX_VCPUS * kvm->arch.emul_smt_mode)) { 2984 pr_devel("KVM: VCPU ID too high\n"); 2985 core = KVM_MAX_VCORES; 2986 } else { 2987 BUG_ON(kvm->arch.smt_mode != 1); 2988 core = kvmppc_pack_vcpu_id(kvm, id); 2989 } 2990 } else { 2991 core = id / kvm->arch.smt_mode; 2992 } 2993 if (core < KVM_MAX_VCORES) { 2994 vcore = kvm->arch.vcores[core]; 2995 if (vcore && cpu_has_feature(CPU_FTR_ARCH_300)) { 2996 pr_devel("KVM: collision on id %u", id); 2997 vcore = NULL; 2998 } else if (!vcore) { 2999 /* 3000 * Take mmu_setup_lock for mutual exclusion 3001 * with kvmppc_update_lpcr(). 3002 */ 3003 err = -ENOMEM; 3004 vcore = kvmppc_vcore_create(kvm, 3005 id & ~(kvm->arch.smt_mode - 1)); 3006 mutex_lock(&kvm->arch.mmu_setup_lock); 3007 kvm->arch.vcores[core] = vcore; 3008 kvm->arch.online_vcores++; 3009 mutex_unlock(&kvm->arch.mmu_setup_lock); 3010 } 3011 } 3012 mutex_unlock(&kvm->lock); 3013 3014 if (!vcore) 3015 return err; 3016 3017 spin_lock(&vcore->lock); 3018 ++vcore->num_threads; 3019 spin_unlock(&vcore->lock); 3020 vcpu->arch.vcore = vcore; 3021 vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid; 3022 vcpu->arch.thread_cpu = -1; 3023 vcpu->arch.prev_cpu = -1; 3024 3025 vcpu->arch.cpu_type = KVM_CPU_3S_64; 3026 kvmppc_sanity_check(vcpu); 3027 3028 return 0; 3029 } 3030 3031 static int kvmhv_set_smt_mode(struct kvm *kvm, unsigned long smt_mode, 3032 unsigned long flags) 3033 { 3034 int err; 3035 int esmt = 0; 3036 3037 if (flags) 3038 return -EINVAL; 3039 if (smt_mode > MAX_SMT_THREADS || !is_power_of_2(smt_mode)) 3040 return -EINVAL; 3041 if (!cpu_has_feature(CPU_FTR_ARCH_300)) { 3042 /* 3043 * On POWER8 (or POWER7), the threading mode is "strict", 3044 * so we pack smt_mode vcpus per vcore. 3045 */ 3046 if (smt_mode > threads_per_subcore) 3047 return -EINVAL; 3048 } else { 3049 /* 3050 * On POWER9, the threading mode is "loose", 3051 * so each vcpu gets its own vcore. 3052 */ 3053 esmt = smt_mode; 3054 smt_mode = 1; 3055 } 3056 mutex_lock(&kvm->lock); 3057 err = -EBUSY; 3058 if (!kvm->arch.online_vcores) { 3059 kvm->arch.smt_mode = smt_mode; 3060 kvm->arch.emul_smt_mode = esmt; 3061 err = 0; 3062 } 3063 mutex_unlock(&kvm->lock); 3064 3065 return err; 3066 } 3067 3068 static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa) 3069 { 3070 if (vpa->pinned_addr) 3071 kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa, 3072 vpa->dirty); 3073 } 3074 3075 static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu) 3076 { 3077 spin_lock(&vcpu->arch.vpa_update_lock); 3078 unpin_vpa(vcpu->kvm, &vcpu->arch.dtl); 3079 unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow); 3080 unpin_vpa(vcpu->kvm, &vcpu->arch.vpa); 3081 spin_unlock(&vcpu->arch.vpa_update_lock); 3082 } 3083 3084 static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu) 3085 { 3086 /* Indicate we want to get back into the guest */ 3087 return 1; 3088 } 3089 3090 static void kvmppc_set_timer(struct kvm_vcpu *vcpu) 3091 { 3092 unsigned long dec_nsec, now; 3093 3094 now = get_tb(); 3095 if (now > kvmppc_dec_expires_host_tb(vcpu)) { 3096 /* decrementer has already gone negative */ 3097 kvmppc_core_queue_dec(vcpu); 3098 kvmppc_core_prepare_to_enter(vcpu); 3099 return; 3100 } 3101 dec_nsec = tb_to_ns(kvmppc_dec_expires_host_tb(vcpu) - now); 3102 hrtimer_start(&vcpu->arch.dec_timer, dec_nsec, HRTIMER_MODE_REL); 3103 vcpu->arch.timer_running = 1; 3104 } 3105 3106 extern int __kvmppc_vcore_entry(void); 3107 3108 static void kvmppc_remove_runnable(struct kvmppc_vcore *vc, 3109 struct kvm_vcpu *vcpu, u64 tb) 3110 { 3111 u64 now; 3112 3113 if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE) 3114 return; 3115 spin_lock_irq(&vcpu->arch.tbacct_lock); 3116 now = tb; 3117 vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) - 3118 vcpu->arch.stolen_logged; 3119 vcpu->arch.busy_preempt = now; 3120 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; 3121 spin_unlock_irq(&vcpu->arch.tbacct_lock); 3122 --vc->n_runnable; 3123 WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], NULL); 3124 } 3125 3126 static int kvmppc_grab_hwthread(int cpu) 3127 { 3128 struct paca_struct *tpaca; 3129 long timeout = 10000; 3130 3131 tpaca = paca_ptrs[cpu]; 3132 3133 /* Ensure the thread won't go into the kernel if it wakes */ 3134 tpaca->kvm_hstate.kvm_vcpu = NULL; 3135 tpaca->kvm_hstate.kvm_vcore = NULL; 3136 tpaca->kvm_hstate.napping = 0; 3137 smp_wmb(); 3138 tpaca->kvm_hstate.hwthread_req = 1; 3139 3140 /* 3141 * If the thread is already executing in the kernel (e.g. handling 3142 * a stray interrupt), wait for it to get back to nap mode. 3143 * The smp_mb() is to ensure that our setting of hwthread_req 3144 * is visible before we look at hwthread_state, so if this 3145 * races with the code at system_reset_pSeries and the thread 3146 * misses our setting of hwthread_req, we are sure to see its 3147 * setting of hwthread_state, and vice versa. 3148 */ 3149 smp_mb(); 3150 while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) { 3151 if (--timeout <= 0) { 3152 pr_err("KVM: couldn't grab cpu %d\n", cpu); 3153 return -EBUSY; 3154 } 3155 udelay(1); 3156 } 3157 return 0; 3158 } 3159 3160 static void kvmppc_release_hwthread(int cpu) 3161 { 3162 struct paca_struct *tpaca; 3163 3164 tpaca = paca_ptrs[cpu]; 3165 tpaca->kvm_hstate.hwthread_req = 0; 3166 tpaca->kvm_hstate.kvm_vcpu = NULL; 3167 tpaca->kvm_hstate.kvm_vcore = NULL; 3168 tpaca->kvm_hstate.kvm_split_mode = NULL; 3169 } 3170 3171 static DEFINE_PER_CPU(struct kvm *, cpu_in_guest); 3172 3173 static void radix_flush_cpu(struct kvm *kvm, int cpu, struct kvm_vcpu *vcpu) 3174 { 3175 struct kvm_nested_guest *nested = vcpu->arch.nested; 3176 cpumask_t *need_tlb_flush; 3177 int i; 3178 3179 if (nested) 3180 need_tlb_flush = &nested->need_tlb_flush; 3181 else 3182 need_tlb_flush = &kvm->arch.need_tlb_flush; 3183 3184 cpu = cpu_first_tlb_thread_sibling(cpu); 3185 for (i = cpu; i <= cpu_last_tlb_thread_sibling(cpu); 3186 i += cpu_tlb_thread_sibling_step()) 3187 cpumask_set_cpu(i, need_tlb_flush); 3188 3189 /* 3190 * Make sure setting of bit in need_tlb_flush precedes testing of 3191 * cpu_in_guest. The matching barrier on the other side is hwsync 3192 * when switching to guest MMU mode, which happens between 3193 * cpu_in_guest being set to the guest kvm, and need_tlb_flush bit 3194 * being tested. 3195 */ 3196 smp_mb(); 3197 3198 for (i = cpu; i <= cpu_last_tlb_thread_sibling(cpu); 3199 i += cpu_tlb_thread_sibling_step()) { 3200 struct kvm *running = *per_cpu_ptr(&cpu_in_guest, i); 3201 3202 if (running == kvm) 3203 smp_call_function_single(i, do_nothing, NULL, 1); 3204 } 3205 } 3206 3207 static void do_migrate_away_vcpu(void *arg) 3208 { 3209 struct kvm_vcpu *vcpu = arg; 3210 struct kvm *kvm = vcpu->kvm; 3211 3212 /* 3213 * If the guest has GTSE, it may execute tlbie, so do a eieio; tlbsync; 3214 * ptesync sequence on the old CPU before migrating to a new one, in 3215 * case we interrupted the guest between a tlbie ; eieio ; 3216 * tlbsync; ptesync sequence. 3217 * 3218 * Otherwise, ptesync is sufficient for ordering tlbiel sequences. 3219 */ 3220 if (kvm->arch.lpcr & LPCR_GTSE) 3221 asm volatile("eieio; tlbsync; ptesync"); 3222 else 3223 asm volatile("ptesync"); 3224 } 3225 3226 static void kvmppc_prepare_radix_vcpu(struct kvm_vcpu *vcpu, int pcpu) 3227 { 3228 struct kvm_nested_guest *nested = vcpu->arch.nested; 3229 struct kvm *kvm = vcpu->kvm; 3230 int prev_cpu; 3231 3232 if (!cpu_has_feature(CPU_FTR_HVMODE)) 3233 return; 3234 3235 if (nested) 3236 prev_cpu = nested->prev_cpu[vcpu->arch.nested_vcpu_id]; 3237 else 3238 prev_cpu = vcpu->arch.prev_cpu; 3239 3240 /* 3241 * With radix, the guest can do TLB invalidations itself, 3242 * and it could choose to use the local form (tlbiel) if 3243 * it is invalidating a translation that has only ever been 3244 * used on one vcpu. However, that doesn't mean it has 3245 * only ever been used on one physical cpu, since vcpus 3246 * can move around between pcpus. To cope with this, when 3247 * a vcpu moves from one pcpu to another, we need to tell 3248 * any vcpus running on the same core as this vcpu previously 3249 * ran to flush the TLB. 3250 */ 3251 if (prev_cpu != pcpu) { 3252 if (prev_cpu >= 0) { 3253 if (cpu_first_tlb_thread_sibling(prev_cpu) != 3254 cpu_first_tlb_thread_sibling(pcpu)) 3255 radix_flush_cpu(kvm, prev_cpu, vcpu); 3256 3257 smp_call_function_single(prev_cpu, 3258 do_migrate_away_vcpu, vcpu, 1); 3259 } 3260 if (nested) 3261 nested->prev_cpu[vcpu->arch.nested_vcpu_id] = pcpu; 3262 else 3263 vcpu->arch.prev_cpu = pcpu; 3264 } 3265 } 3266 3267 static void kvmppc_start_thread(struct kvm_vcpu *vcpu, struct kvmppc_vcore *vc) 3268 { 3269 int cpu; 3270 struct paca_struct *tpaca; 3271 3272 cpu = vc->pcpu; 3273 if (vcpu) { 3274 if (vcpu->arch.timer_running) { 3275 hrtimer_try_to_cancel(&vcpu->arch.dec_timer); 3276 vcpu->arch.timer_running = 0; 3277 } 3278 cpu += vcpu->arch.ptid; 3279 vcpu->cpu = vc->pcpu; 3280 vcpu->arch.thread_cpu = cpu; 3281 } 3282 tpaca = paca_ptrs[cpu]; 3283 tpaca->kvm_hstate.kvm_vcpu = vcpu; 3284 tpaca->kvm_hstate.ptid = cpu - vc->pcpu; 3285 tpaca->kvm_hstate.fake_suspend = 0; 3286 /* Order stores to hstate.kvm_vcpu etc. before store to kvm_vcore */ 3287 smp_wmb(); 3288 tpaca->kvm_hstate.kvm_vcore = vc; 3289 if (cpu != smp_processor_id()) 3290 kvmppc_ipi_thread(cpu); 3291 } 3292 3293 static void kvmppc_wait_for_nap(int n_threads) 3294 { 3295 int cpu = smp_processor_id(); 3296 int i, loops; 3297 3298 if (n_threads <= 1) 3299 return; 3300 for (loops = 0; loops < 1000000; ++loops) { 3301 /* 3302 * Check if all threads are finished. 3303 * We set the vcore pointer when starting a thread 3304 * and the thread clears it when finished, so we look 3305 * for any threads that still have a non-NULL vcore ptr. 3306 */ 3307 for (i = 1; i < n_threads; ++i) 3308 if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore) 3309 break; 3310 if (i == n_threads) { 3311 HMT_medium(); 3312 return; 3313 } 3314 HMT_low(); 3315 } 3316 HMT_medium(); 3317 for (i = 1; i < n_threads; ++i) 3318 if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore) 3319 pr_err("KVM: CPU %d seems to be stuck\n", cpu + i); 3320 } 3321 3322 /* 3323 * Check that we are on thread 0 and that any other threads in 3324 * this core are off-line. Then grab the threads so they can't 3325 * enter the kernel. 3326 */ 3327 static int on_primary_thread(void) 3328 { 3329 int cpu = smp_processor_id(); 3330 int thr; 3331 3332 /* Are we on a primary subcore? */ 3333 if (cpu_thread_in_subcore(cpu)) 3334 return 0; 3335 3336 thr = 0; 3337 while (++thr < threads_per_subcore) 3338 if (cpu_online(cpu + thr)) 3339 return 0; 3340 3341 /* Grab all hw threads so they can't go into the kernel */ 3342 for (thr = 1; thr < threads_per_subcore; ++thr) { 3343 if (kvmppc_grab_hwthread(cpu + thr)) { 3344 /* Couldn't grab one; let the others go */ 3345 do { 3346 kvmppc_release_hwthread(cpu + thr); 3347 } while (--thr > 0); 3348 return 0; 3349 } 3350 } 3351 return 1; 3352 } 3353 3354 /* 3355 * A list of virtual cores for each physical CPU. 3356 * These are vcores that could run but their runner VCPU tasks are 3357 * (or may be) preempted. 3358 */ 3359 struct preempted_vcore_list { 3360 struct list_head list; 3361 spinlock_t lock; 3362 }; 3363 3364 static DEFINE_PER_CPU(struct preempted_vcore_list, preempted_vcores); 3365 3366 static void init_vcore_lists(void) 3367 { 3368 int cpu; 3369 3370 for_each_possible_cpu(cpu) { 3371 struct preempted_vcore_list *lp = &per_cpu(preempted_vcores, cpu); 3372 spin_lock_init(&lp->lock); 3373 INIT_LIST_HEAD(&lp->list); 3374 } 3375 } 3376 3377 static void kvmppc_vcore_preempt(struct kvmppc_vcore *vc) 3378 { 3379 struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores); 3380 3381 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); 3382 3383 vc->vcore_state = VCORE_PREEMPT; 3384 vc->pcpu = smp_processor_id(); 3385 if (vc->num_threads < threads_per_vcore(vc->kvm)) { 3386 spin_lock(&lp->lock); 3387 list_add_tail(&vc->preempt_list, &lp->list); 3388 spin_unlock(&lp->lock); 3389 } 3390 3391 /* Start accumulating stolen time */ 3392 kvmppc_core_start_stolen(vc, mftb()); 3393 } 3394 3395 static void kvmppc_vcore_end_preempt(struct kvmppc_vcore *vc) 3396 { 3397 struct preempted_vcore_list *lp; 3398 3399 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); 3400 3401 kvmppc_core_end_stolen(vc, mftb()); 3402 if (!list_empty(&vc->preempt_list)) { 3403 lp = &per_cpu(preempted_vcores, vc->pcpu); 3404 spin_lock(&lp->lock); 3405 list_del_init(&vc->preempt_list); 3406 spin_unlock(&lp->lock); 3407 } 3408 vc->vcore_state = VCORE_INACTIVE; 3409 } 3410 3411 /* 3412 * This stores information about the virtual cores currently 3413 * assigned to a physical core. 3414 */ 3415 struct core_info { 3416 int n_subcores; 3417 int max_subcore_threads; 3418 int total_threads; 3419 int subcore_threads[MAX_SUBCORES]; 3420 struct kvmppc_vcore *vc[MAX_SUBCORES]; 3421 }; 3422 3423 /* 3424 * This mapping means subcores 0 and 1 can use threads 0-3 and 4-7 3425 * respectively in 2-way micro-threading (split-core) mode on POWER8. 3426 */ 3427 static int subcore_thread_map[MAX_SUBCORES] = { 0, 4, 2, 6 }; 3428 3429 static void init_core_info(struct core_info *cip, struct kvmppc_vcore *vc) 3430 { 3431 memset(cip, 0, sizeof(*cip)); 3432 cip->n_subcores = 1; 3433 cip->max_subcore_threads = vc->num_threads; 3434 cip->total_threads = vc->num_threads; 3435 cip->subcore_threads[0] = vc->num_threads; 3436 cip->vc[0] = vc; 3437 } 3438 3439 static bool subcore_config_ok(int n_subcores, int n_threads) 3440 { 3441 /* 3442 * POWER9 "SMT4" cores are permanently in what is effectively a 4-way 3443 * split-core mode, with one thread per subcore. 3444 */ 3445 if (cpu_has_feature(CPU_FTR_ARCH_300)) 3446 return n_subcores <= 4 && n_threads == 1; 3447 3448 /* On POWER8, can only dynamically split if unsplit to begin with */ 3449 if (n_subcores > 1 && threads_per_subcore < MAX_SMT_THREADS) 3450 return false; 3451 if (n_subcores > MAX_SUBCORES) 3452 return false; 3453 if (n_subcores > 1) { 3454 if (!(dynamic_mt_modes & 2)) 3455 n_subcores = 4; 3456 if (n_subcores > 2 && !(dynamic_mt_modes & 4)) 3457 return false; 3458 } 3459 3460 return n_subcores * roundup_pow_of_two(n_threads) <= MAX_SMT_THREADS; 3461 } 3462 3463 static void init_vcore_to_run(struct kvmppc_vcore *vc) 3464 { 3465 vc->entry_exit_map = 0; 3466 vc->in_guest = 0; 3467 vc->napping_threads = 0; 3468 vc->conferring_threads = 0; 3469 vc->tb_offset_applied = 0; 3470 } 3471 3472 static bool can_dynamic_split(struct kvmppc_vcore *vc, struct core_info *cip) 3473 { 3474 int n_threads = vc->num_threads; 3475 int sub; 3476 3477 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) 3478 return false; 3479 3480 /* In one_vm_per_core mode, require all vcores to be from the same vm */ 3481 if (one_vm_per_core && vc->kvm != cip->vc[0]->kvm) 3482 return false; 3483 3484 if (n_threads < cip->max_subcore_threads) 3485 n_threads = cip->max_subcore_threads; 3486 if (!subcore_config_ok(cip->n_subcores + 1, n_threads)) 3487 return false; 3488 cip->max_subcore_threads = n_threads; 3489 3490 sub = cip->n_subcores; 3491 ++cip->n_subcores; 3492 cip->total_threads += vc->num_threads; 3493 cip->subcore_threads[sub] = vc->num_threads; 3494 cip->vc[sub] = vc; 3495 init_vcore_to_run(vc); 3496 list_del_init(&vc->preempt_list); 3497 3498 return true; 3499 } 3500 3501 /* 3502 * Work out whether it is possible to piggyback the execution of 3503 * vcore *pvc onto the execution of the other vcores described in *cip. 3504 */ 3505 static bool can_piggyback(struct kvmppc_vcore *pvc, struct core_info *cip, 3506 int target_threads) 3507 { 3508 if (cip->total_threads + pvc->num_threads > target_threads) 3509 return false; 3510 3511 return can_dynamic_split(pvc, cip); 3512 } 3513 3514 static void prepare_threads(struct kvmppc_vcore *vc) 3515 { 3516 int i; 3517 struct kvm_vcpu *vcpu; 3518 3519 for_each_runnable_thread(i, vcpu, vc) { 3520 if (signal_pending(vcpu->arch.run_task)) 3521 vcpu->arch.ret = -EINTR; 3522 else if (vcpu->arch.vpa.update_pending || 3523 vcpu->arch.slb_shadow.update_pending || 3524 vcpu->arch.dtl.update_pending) 3525 vcpu->arch.ret = RESUME_GUEST; 3526 else 3527 continue; 3528 kvmppc_remove_runnable(vc, vcpu, mftb()); 3529 wake_up(&vcpu->arch.cpu_run); 3530 } 3531 } 3532 3533 static void collect_piggybacks(struct core_info *cip, int target_threads) 3534 { 3535 struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores); 3536 struct kvmppc_vcore *pvc, *vcnext; 3537 3538 spin_lock(&lp->lock); 3539 list_for_each_entry_safe(pvc, vcnext, &lp->list, preempt_list) { 3540 if (!spin_trylock(&pvc->lock)) 3541 continue; 3542 prepare_threads(pvc); 3543 if (!pvc->n_runnable || !pvc->kvm->arch.mmu_ready) { 3544 list_del_init(&pvc->preempt_list); 3545 if (pvc->runner == NULL) { 3546 pvc->vcore_state = VCORE_INACTIVE; 3547 kvmppc_core_end_stolen(pvc, mftb()); 3548 } 3549 spin_unlock(&pvc->lock); 3550 continue; 3551 } 3552 if (!can_piggyback(pvc, cip, target_threads)) { 3553 spin_unlock(&pvc->lock); 3554 continue; 3555 } 3556 kvmppc_core_end_stolen(pvc, mftb()); 3557 pvc->vcore_state = VCORE_PIGGYBACK; 3558 if (cip->total_threads >= target_threads) 3559 break; 3560 } 3561 spin_unlock(&lp->lock); 3562 } 3563 3564 static bool recheck_signals_and_mmu(struct core_info *cip) 3565 { 3566 int sub, i; 3567 struct kvm_vcpu *vcpu; 3568 struct kvmppc_vcore *vc; 3569 3570 for (sub = 0; sub < cip->n_subcores; ++sub) { 3571 vc = cip->vc[sub]; 3572 if (!vc->kvm->arch.mmu_ready) 3573 return true; 3574 for_each_runnable_thread(i, vcpu, vc) 3575 if (signal_pending(vcpu->arch.run_task)) 3576 return true; 3577 } 3578 return false; 3579 } 3580 3581 static void post_guest_process(struct kvmppc_vcore *vc, bool is_master) 3582 { 3583 int still_running = 0, i; 3584 u64 now; 3585 long ret; 3586 struct kvm_vcpu *vcpu; 3587 3588 spin_lock(&vc->lock); 3589 now = get_tb(); 3590 for_each_runnable_thread(i, vcpu, vc) { 3591 /* 3592 * It's safe to unlock the vcore in the loop here, because 3593 * for_each_runnable_thread() is safe against removal of 3594 * the vcpu, and the vcore state is VCORE_EXITING here, 3595 * so any vcpus becoming runnable will have their arch.trap 3596 * set to zero and can't actually run in the guest. 3597 */ 3598 spin_unlock(&vc->lock); 3599 /* cancel pending dec exception if dec is positive */ 3600 if (now < kvmppc_dec_expires_host_tb(vcpu) && 3601 kvmppc_core_pending_dec(vcpu)) 3602 kvmppc_core_dequeue_dec(vcpu); 3603 3604 trace_kvm_guest_exit(vcpu); 3605 3606 ret = RESUME_GUEST; 3607 if (vcpu->arch.trap) 3608 ret = kvmppc_handle_exit_hv(vcpu, 3609 vcpu->arch.run_task); 3610 3611 vcpu->arch.ret = ret; 3612 vcpu->arch.trap = 0; 3613 3614 spin_lock(&vc->lock); 3615 if (is_kvmppc_resume_guest(vcpu->arch.ret)) { 3616 if (vcpu->arch.pending_exceptions) 3617 kvmppc_core_prepare_to_enter(vcpu); 3618 if (vcpu->arch.ceded) 3619 kvmppc_set_timer(vcpu); 3620 else 3621 ++still_running; 3622 } else { 3623 kvmppc_remove_runnable(vc, vcpu, mftb()); 3624 wake_up(&vcpu->arch.cpu_run); 3625 } 3626 } 3627 if (!is_master) { 3628 if (still_running > 0) { 3629 kvmppc_vcore_preempt(vc); 3630 } else if (vc->runner) { 3631 vc->vcore_state = VCORE_PREEMPT; 3632 kvmppc_core_start_stolen(vc, mftb()); 3633 } else { 3634 vc->vcore_state = VCORE_INACTIVE; 3635 } 3636 if (vc->n_runnable > 0 && vc->runner == NULL) { 3637 /* make sure there's a candidate runner awake */ 3638 i = -1; 3639 vcpu = next_runnable_thread(vc, &i); 3640 wake_up(&vcpu->arch.cpu_run); 3641 } 3642 } 3643 spin_unlock(&vc->lock); 3644 } 3645 3646 /* 3647 * Clear core from the list of active host cores as we are about to 3648 * enter the guest. Only do this if it is the primary thread of the 3649 * core (not if a subcore) that is entering the guest. 3650 */ 3651 static inline int kvmppc_clear_host_core(unsigned int cpu) 3652 { 3653 int core; 3654 3655 if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu)) 3656 return 0; 3657 /* 3658 * Memory barrier can be omitted here as we will do a smp_wmb() 3659 * later in kvmppc_start_thread and we need ensure that state is 3660 * visible to other CPUs only after we enter guest. 3661 */ 3662 core = cpu >> threads_shift; 3663 kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 0; 3664 return 0; 3665 } 3666 3667 /* 3668 * Advertise this core as an active host core since we exited the guest 3669 * Only need to do this if it is the primary thread of the core that is 3670 * exiting. 3671 */ 3672 static inline int kvmppc_set_host_core(unsigned int cpu) 3673 { 3674 int core; 3675 3676 if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu)) 3677 return 0; 3678 3679 /* 3680 * Memory barrier can be omitted here because we do a spin_unlock 3681 * immediately after this which provides the memory barrier. 3682 */ 3683 core = cpu >> threads_shift; 3684 kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 1; 3685 return 0; 3686 } 3687 3688 static void set_irq_happened(int trap) 3689 { 3690 switch (trap) { 3691 case BOOK3S_INTERRUPT_EXTERNAL: 3692 local_paca->irq_happened |= PACA_IRQ_EE; 3693 break; 3694 case BOOK3S_INTERRUPT_H_DOORBELL: 3695 local_paca->irq_happened |= PACA_IRQ_DBELL; 3696 break; 3697 case BOOK3S_INTERRUPT_HMI: 3698 local_paca->irq_happened |= PACA_IRQ_HMI; 3699 break; 3700 case BOOK3S_INTERRUPT_SYSTEM_RESET: 3701 replay_system_reset(); 3702 break; 3703 } 3704 } 3705 3706 /* 3707 * Run a set of guest threads on a physical core. 3708 * Called with vc->lock held. 3709 */ 3710 static noinline void kvmppc_run_core(struct kvmppc_vcore *vc) 3711 { 3712 struct kvm_vcpu *vcpu; 3713 int i; 3714 int srcu_idx; 3715 struct core_info core_info; 3716 struct kvmppc_vcore *pvc; 3717 struct kvm_split_mode split_info, *sip; 3718 int split, subcore_size, active; 3719 int sub; 3720 bool thr0_done; 3721 unsigned long cmd_bit, stat_bit; 3722 int pcpu, thr; 3723 int target_threads; 3724 int controlled_threads; 3725 int trap; 3726 bool is_power8; 3727 3728 if (WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300))) 3729 return; 3730 3731 /* 3732 * Remove from the list any threads that have a signal pending 3733 * or need a VPA update done 3734 */ 3735 prepare_threads(vc); 3736 3737 /* if the runner is no longer runnable, let the caller pick a new one */ 3738 if (vc->runner->arch.state != KVMPPC_VCPU_RUNNABLE) 3739 return; 3740 3741 /* 3742 * Initialize *vc. 3743 */ 3744 init_vcore_to_run(vc); 3745 vc->preempt_tb = TB_NIL; 3746 3747 /* 3748 * Number of threads that we will be controlling: the same as 3749 * the number of threads per subcore, except on POWER9, 3750 * where it's 1 because the threads are (mostly) independent. 3751 */ 3752 controlled_threads = threads_per_vcore(vc->kvm); 3753 3754 /* 3755 * Make sure we are running on primary threads, and that secondary 3756 * threads are offline. Also check if the number of threads in this 3757 * guest are greater than the current system threads per guest. 3758 */ 3759 if ((controlled_threads > 1) && 3760 ((vc->num_threads > threads_per_subcore) || !on_primary_thread())) { 3761 for_each_runnable_thread(i, vcpu, vc) { 3762 vcpu->arch.ret = -EBUSY; 3763 kvmppc_remove_runnable(vc, vcpu, mftb()); 3764 wake_up(&vcpu->arch.cpu_run); 3765 } 3766 goto out; 3767 } 3768 3769 /* 3770 * See if we could run any other vcores on the physical core 3771 * along with this one. 3772 */ 3773 init_core_info(&core_info, vc); 3774 pcpu = smp_processor_id(); 3775 target_threads = controlled_threads; 3776 if (target_smt_mode && target_smt_mode < target_threads) 3777 target_threads = target_smt_mode; 3778 if (vc->num_threads < target_threads) 3779 collect_piggybacks(&core_info, target_threads); 3780 3781 /* 3782 * Hard-disable interrupts, and check resched flag and signals. 3783 * If we need to reschedule or deliver a signal, clean up 3784 * and return without going into the guest(s). 3785 * If the mmu_ready flag has been cleared, don't go into the 3786 * guest because that means a HPT resize operation is in progress. 3787 */ 3788 local_irq_disable(); 3789 hard_irq_disable(); 3790 if (lazy_irq_pending() || need_resched() || 3791 recheck_signals_and_mmu(&core_info)) { 3792 local_irq_enable(); 3793 vc->vcore_state = VCORE_INACTIVE; 3794 /* Unlock all except the primary vcore */ 3795 for (sub = 1; sub < core_info.n_subcores; ++sub) { 3796 pvc = core_info.vc[sub]; 3797 /* Put back on to the preempted vcores list */ 3798 kvmppc_vcore_preempt(pvc); 3799 spin_unlock(&pvc->lock); 3800 } 3801 for (i = 0; i < controlled_threads; ++i) 3802 kvmppc_release_hwthread(pcpu + i); 3803 return; 3804 } 3805 3806 kvmppc_clear_host_core(pcpu); 3807 3808 /* Decide on micro-threading (split-core) mode */ 3809 subcore_size = threads_per_subcore; 3810 cmd_bit = stat_bit = 0; 3811 split = core_info.n_subcores; 3812 sip = NULL; 3813 is_power8 = cpu_has_feature(CPU_FTR_ARCH_207S); 3814 3815 if (split > 1) { 3816 sip = &split_info; 3817 memset(&split_info, 0, sizeof(split_info)); 3818 for (sub = 0; sub < core_info.n_subcores; ++sub) 3819 split_info.vc[sub] = core_info.vc[sub]; 3820 3821 if (is_power8) { 3822 if (split == 2 && (dynamic_mt_modes & 2)) { 3823 cmd_bit = HID0_POWER8_1TO2LPAR; 3824 stat_bit = HID0_POWER8_2LPARMODE; 3825 } else { 3826 split = 4; 3827 cmd_bit = HID0_POWER8_1TO4LPAR; 3828 stat_bit = HID0_POWER8_4LPARMODE; 3829 } 3830 subcore_size = MAX_SMT_THREADS / split; 3831 split_info.rpr = mfspr(SPRN_RPR); 3832 split_info.pmmar = mfspr(SPRN_PMMAR); 3833 split_info.ldbar = mfspr(SPRN_LDBAR); 3834 split_info.subcore_size = subcore_size; 3835 } else { 3836 split_info.subcore_size = 1; 3837 } 3838 3839 /* order writes to split_info before kvm_split_mode pointer */ 3840 smp_wmb(); 3841 } 3842 3843 for (thr = 0; thr < controlled_threads; ++thr) { 3844 struct paca_struct *paca = paca_ptrs[pcpu + thr]; 3845 3846 paca->kvm_hstate.napping = 0; 3847 paca->kvm_hstate.kvm_split_mode = sip; 3848 } 3849 3850 /* Initiate micro-threading (split-core) on POWER8 if required */ 3851 if (cmd_bit) { 3852 unsigned long hid0 = mfspr(SPRN_HID0); 3853 3854 hid0 |= cmd_bit | HID0_POWER8_DYNLPARDIS; 3855 mb(); 3856 mtspr(SPRN_HID0, hid0); 3857 isync(); 3858 for (;;) { 3859 hid0 = mfspr(SPRN_HID0); 3860 if (hid0 & stat_bit) 3861 break; 3862 cpu_relax(); 3863 } 3864 } 3865 3866 /* 3867 * On POWER8, set RWMR register. 3868 * Since it only affects PURR and SPURR, it doesn't affect 3869 * the host, so we don't save/restore the host value. 3870 */ 3871 if (is_power8) { 3872 unsigned long rwmr_val = RWMR_RPA_P8_8THREAD; 3873 int n_online = atomic_read(&vc->online_count); 3874 3875 /* 3876 * Use the 8-thread value if we're doing split-core 3877 * or if the vcore's online count looks bogus. 3878 */ 3879 if (split == 1 && threads_per_subcore == MAX_SMT_THREADS && 3880 n_online >= 1 && n_online <= MAX_SMT_THREADS) 3881 rwmr_val = p8_rwmr_values[n_online]; 3882 mtspr(SPRN_RWMR, rwmr_val); 3883 } 3884 3885 /* Start all the threads */ 3886 active = 0; 3887 for (sub = 0; sub < core_info.n_subcores; ++sub) { 3888 thr = is_power8 ? subcore_thread_map[sub] : sub; 3889 thr0_done = false; 3890 active |= 1 << thr; 3891 pvc = core_info.vc[sub]; 3892 pvc->pcpu = pcpu + thr; 3893 for_each_runnable_thread(i, vcpu, pvc) { 3894 /* 3895 * XXX: is kvmppc_start_thread called too late here? 3896 * It updates vcpu->cpu and vcpu->arch.thread_cpu 3897 * which are used by kvmppc_fast_vcpu_kick_hv(), but 3898 * kick is called after new exceptions become available 3899 * and exceptions are checked earlier than here, by 3900 * kvmppc_core_prepare_to_enter. 3901 */ 3902 kvmppc_start_thread(vcpu, pvc); 3903 kvmppc_update_vpa_dispatch(vcpu, pvc); 3904 trace_kvm_guest_enter(vcpu); 3905 if (!vcpu->arch.ptid) 3906 thr0_done = true; 3907 active |= 1 << (thr + vcpu->arch.ptid); 3908 } 3909 /* 3910 * We need to start the first thread of each subcore 3911 * even if it doesn't have a vcpu. 3912 */ 3913 if (!thr0_done) 3914 kvmppc_start_thread(NULL, pvc); 3915 } 3916 3917 /* 3918 * Ensure that split_info.do_nap is set after setting 3919 * the vcore pointer in the PACA of the secondaries. 3920 */ 3921 smp_mb(); 3922 3923 /* 3924 * When doing micro-threading, poke the inactive threads as well. 3925 * This gets them to the nap instruction after kvm_do_nap, 3926 * which reduces the time taken to unsplit later. 3927 */ 3928 if (cmd_bit) { 3929 split_info.do_nap = 1; /* ask secondaries to nap when done */ 3930 for (thr = 1; thr < threads_per_subcore; ++thr) 3931 if (!(active & (1 << thr))) 3932 kvmppc_ipi_thread(pcpu + thr); 3933 } 3934 3935 vc->vcore_state = VCORE_RUNNING; 3936 preempt_disable(); 3937 3938 trace_kvmppc_run_core(vc, 0); 3939 3940 for (sub = 0; sub < core_info.n_subcores; ++sub) 3941 spin_unlock(&core_info.vc[sub]->lock); 3942 3943 guest_timing_enter_irqoff(); 3944 3945 srcu_idx = srcu_read_lock(&vc->kvm->srcu); 3946 3947 guest_state_enter_irqoff(); 3948 this_cpu_disable_ftrace(); 3949 3950 trap = __kvmppc_vcore_entry(); 3951 3952 this_cpu_enable_ftrace(); 3953 guest_state_exit_irqoff(); 3954 3955 srcu_read_unlock(&vc->kvm->srcu, srcu_idx); 3956 3957 set_irq_happened(trap); 3958 3959 spin_lock(&vc->lock); 3960 /* prevent other vcpu threads from doing kvmppc_start_thread() now */ 3961 vc->vcore_state = VCORE_EXITING; 3962 3963 /* wait for secondary threads to finish writing their state to memory */ 3964 kvmppc_wait_for_nap(controlled_threads); 3965 3966 /* Return to whole-core mode if we split the core earlier */ 3967 if (cmd_bit) { 3968 unsigned long hid0 = mfspr(SPRN_HID0); 3969 unsigned long loops = 0; 3970 3971 hid0 &= ~HID0_POWER8_DYNLPARDIS; 3972 stat_bit = HID0_POWER8_2LPARMODE | HID0_POWER8_4LPARMODE; 3973 mb(); 3974 mtspr(SPRN_HID0, hid0); 3975 isync(); 3976 for (;;) { 3977 hid0 = mfspr(SPRN_HID0); 3978 if (!(hid0 & stat_bit)) 3979 break; 3980 cpu_relax(); 3981 ++loops; 3982 } 3983 split_info.do_nap = 0; 3984 } 3985 3986 kvmppc_set_host_core(pcpu); 3987 3988 if (!vtime_accounting_enabled_this_cpu()) { 3989 local_irq_enable(); 3990 /* 3991 * Service IRQs here before guest_timing_exit_irqoff() so any 3992 * ticks that occurred while running the guest are accounted to 3993 * the guest. If vtime accounting is enabled, accounting uses 3994 * TB rather than ticks, so it can be done without enabling 3995 * interrupts here, which has the problem that it accounts 3996 * interrupt processing overhead to the host. 3997 */ 3998 local_irq_disable(); 3999 } 4000 guest_timing_exit_irqoff(); 4001 4002 local_irq_enable(); 4003 4004 /* Let secondaries go back to the offline loop */ 4005 for (i = 0; i < controlled_threads; ++i) { 4006 kvmppc_release_hwthread(pcpu + i); 4007 if (sip && sip->napped[i]) 4008 kvmppc_ipi_thread(pcpu + i); 4009 } 4010 4011 spin_unlock(&vc->lock); 4012 4013 /* make sure updates to secondary vcpu structs are visible now */ 4014 smp_mb(); 4015 4016 preempt_enable(); 4017 4018 for (sub = 0; sub < core_info.n_subcores; ++sub) { 4019 pvc = core_info.vc[sub]; 4020 post_guest_process(pvc, pvc == vc); 4021 } 4022 4023 spin_lock(&vc->lock); 4024 4025 out: 4026 vc->vcore_state = VCORE_INACTIVE; 4027 trace_kvmppc_run_core(vc, 1); 4028 } 4029 4030 static inline bool hcall_is_xics(unsigned long req) 4031 { 4032 return req == H_EOI || req == H_CPPR || req == H_IPI || 4033 req == H_IPOLL || req == H_XIRR || req == H_XIRR_X; 4034 } 4035 4036 static void vcpu_vpa_increment_dispatch(struct kvm_vcpu *vcpu) 4037 { 4038 struct lppaca *lp = vcpu->arch.vpa.pinned_addr; 4039 if (lp) { 4040 u32 yield_count = be32_to_cpu(lp->yield_count) + 1; 4041 lp->yield_count = cpu_to_be32(yield_count); 4042 vcpu->arch.vpa.dirty = 1; 4043 } 4044 } 4045 4046 /* call our hypervisor to load up HV regs and go */ 4047 static int kvmhv_vcpu_entry_p9_nested(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpcr, u64 *tb) 4048 { 4049 struct kvmppc_vcore *vc = vcpu->arch.vcore; 4050 unsigned long host_psscr; 4051 unsigned long msr; 4052 struct hv_guest_state hvregs; 4053 struct p9_host_os_sprs host_os_sprs; 4054 s64 dec; 4055 int trap; 4056 4057 msr = mfmsr(); 4058 4059 save_p9_host_os_sprs(&host_os_sprs); 4060 4061 /* 4062 * We need to save and restore the guest visible part of the 4063 * psscr (i.e. using SPRN_PSSCR_PR) since the hypervisor 4064 * doesn't do this for us. Note only required if pseries since 4065 * this is done in kvmhv_vcpu_entry_p9() below otherwise. 4066 */ 4067 host_psscr = mfspr(SPRN_PSSCR_PR); 4068 4069 kvmppc_msr_hard_disable_set_facilities(vcpu, msr); 4070 if (lazy_irq_pending()) 4071 return 0; 4072 4073 if (unlikely(load_vcpu_state(vcpu, &host_os_sprs))) 4074 msr = mfmsr(); /* TM restore can update msr */ 4075 4076 if (vcpu->arch.psscr != host_psscr) 4077 mtspr(SPRN_PSSCR_PR, vcpu->arch.psscr); 4078 4079 kvmhv_save_hv_regs(vcpu, &hvregs); 4080 hvregs.lpcr = lpcr; 4081 hvregs.amor = ~0; 4082 vcpu->arch.regs.msr = vcpu->arch.shregs.msr; 4083 hvregs.version = HV_GUEST_STATE_VERSION; 4084 if (vcpu->arch.nested) { 4085 hvregs.lpid = vcpu->arch.nested->shadow_lpid; 4086 hvregs.vcpu_token = vcpu->arch.nested_vcpu_id; 4087 } else { 4088 hvregs.lpid = vcpu->kvm->arch.lpid; 4089 hvregs.vcpu_token = vcpu->vcpu_id; 4090 } 4091 hvregs.hdec_expiry = time_limit; 4092 4093 /* 4094 * When setting DEC, we must always deal with irq_work_raise 4095 * via NMI vs setting DEC. The problem occurs right as we 4096 * switch into guest mode if a NMI hits and sets pending work 4097 * and sets DEC, then that will apply to the guest and not 4098 * bring us back to the host. 4099 * 4100 * irq_work_raise could check a flag (or possibly LPCR[HDICE] 4101 * for example) and set HDEC to 1? That wouldn't solve the 4102 * nested hv case which needs to abort the hcall or zero the 4103 * time limit. 4104 * 4105 * XXX: Another day's problem. 4106 */ 4107 mtspr(SPRN_DEC, kvmppc_dec_expires_host_tb(vcpu) - *tb); 4108 4109 mtspr(SPRN_DAR, vcpu->arch.shregs.dar); 4110 mtspr(SPRN_DSISR, vcpu->arch.shregs.dsisr); 4111 switch_pmu_to_guest(vcpu, &host_os_sprs); 4112 accumulate_time(vcpu, &vcpu->arch.in_guest); 4113 trap = plpar_hcall_norets(H_ENTER_NESTED, __pa(&hvregs), 4114 __pa(&vcpu->arch.regs)); 4115 accumulate_time(vcpu, &vcpu->arch.guest_exit); 4116 kvmhv_restore_hv_return_state(vcpu, &hvregs); 4117 switch_pmu_to_host(vcpu, &host_os_sprs); 4118 vcpu->arch.shregs.msr = vcpu->arch.regs.msr; 4119 vcpu->arch.shregs.dar = mfspr(SPRN_DAR); 4120 vcpu->arch.shregs.dsisr = mfspr(SPRN_DSISR); 4121 vcpu->arch.psscr = mfspr(SPRN_PSSCR_PR); 4122 4123 store_vcpu_state(vcpu); 4124 4125 dec = mfspr(SPRN_DEC); 4126 if (!(lpcr & LPCR_LD)) /* Sign extend if not using large decrementer */ 4127 dec = (s32) dec; 4128 *tb = mftb(); 4129 vcpu->arch.dec_expires = dec + (*tb + vc->tb_offset); 4130 4131 timer_rearm_host_dec(*tb); 4132 4133 restore_p9_host_os_sprs(vcpu, &host_os_sprs); 4134 if (vcpu->arch.psscr != host_psscr) 4135 mtspr(SPRN_PSSCR_PR, host_psscr); 4136 4137 return trap; 4138 } 4139 4140 /* 4141 * Guest entry for POWER9 and later CPUs. 4142 */ 4143 static int kvmhv_p9_guest_entry(struct kvm_vcpu *vcpu, u64 time_limit, 4144 unsigned long lpcr, u64 *tb) 4145 { 4146 struct kvm *kvm = vcpu->kvm; 4147 struct kvm_nested_guest *nested = vcpu->arch.nested; 4148 u64 next_timer; 4149 int trap; 4150 4151 next_timer = timer_get_next_tb(); 4152 if (*tb >= next_timer) 4153 return BOOK3S_INTERRUPT_HV_DECREMENTER; 4154 if (next_timer < time_limit) 4155 time_limit = next_timer; 4156 else if (*tb >= time_limit) /* nested time limit */ 4157 return BOOK3S_INTERRUPT_NESTED_HV_DECREMENTER; 4158 4159 vcpu->arch.ceded = 0; 4160 4161 vcpu_vpa_increment_dispatch(vcpu); 4162 4163 if (kvmhv_on_pseries()) { 4164 trap = kvmhv_vcpu_entry_p9_nested(vcpu, time_limit, lpcr, tb); 4165 4166 /* H_CEDE has to be handled now, not later */ 4167 if (trap == BOOK3S_INTERRUPT_SYSCALL && !nested && 4168 kvmppc_get_gpr(vcpu, 3) == H_CEDE) { 4169 kvmppc_cede(vcpu); 4170 kvmppc_set_gpr(vcpu, 3, 0); 4171 trap = 0; 4172 } 4173 4174 } else if (nested) { 4175 __this_cpu_write(cpu_in_guest, kvm); 4176 trap = kvmhv_vcpu_entry_p9(vcpu, time_limit, lpcr, tb); 4177 __this_cpu_write(cpu_in_guest, NULL); 4178 4179 } else { 4180 kvmppc_xive_push_vcpu(vcpu); 4181 4182 __this_cpu_write(cpu_in_guest, kvm); 4183 trap = kvmhv_vcpu_entry_p9(vcpu, time_limit, lpcr, tb); 4184 __this_cpu_write(cpu_in_guest, NULL); 4185 4186 if (trap == BOOK3S_INTERRUPT_SYSCALL && 4187 !(__kvmppc_get_msr_hv(vcpu) & MSR_PR)) { 4188 unsigned long req = kvmppc_get_gpr(vcpu, 3); 4189 4190 /* 4191 * XIVE rearm and XICS hcalls must be handled 4192 * before xive context is pulled (is this 4193 * true?) 4194 */ 4195 if (req == H_CEDE) { 4196 /* H_CEDE has to be handled now */ 4197 kvmppc_cede(vcpu); 4198 if (!kvmppc_xive_rearm_escalation(vcpu)) { 4199 /* 4200 * Pending escalation so abort 4201 * the cede. 4202 */ 4203 vcpu->arch.ceded = 0; 4204 } 4205 kvmppc_set_gpr(vcpu, 3, 0); 4206 trap = 0; 4207 4208 } else if (req == H_ENTER_NESTED) { 4209 /* 4210 * L2 should not run with the L1 4211 * context so rearm and pull it. 4212 */ 4213 if (!kvmppc_xive_rearm_escalation(vcpu)) { 4214 /* 4215 * Pending escalation so abort 4216 * H_ENTER_NESTED. 4217 */ 4218 kvmppc_set_gpr(vcpu, 3, 0); 4219 trap = 0; 4220 } 4221 4222 } else if (hcall_is_xics(req)) { 4223 int ret; 4224 4225 ret = kvmppc_xive_xics_hcall(vcpu, req); 4226 if (ret != H_TOO_HARD) { 4227 kvmppc_set_gpr(vcpu, 3, ret); 4228 trap = 0; 4229 } 4230 } 4231 } 4232 kvmppc_xive_pull_vcpu(vcpu); 4233 4234 if (kvm_is_radix(kvm)) 4235 vcpu->arch.slb_max = 0; 4236 } 4237 4238 vcpu_vpa_increment_dispatch(vcpu); 4239 4240 return trap; 4241 } 4242 4243 /* 4244 * Wait for some other vcpu thread to execute us, and 4245 * wake us up when we need to handle something in the host. 4246 */ 4247 static void kvmppc_wait_for_exec(struct kvmppc_vcore *vc, 4248 struct kvm_vcpu *vcpu, int wait_state) 4249 { 4250 DEFINE_WAIT(wait); 4251 4252 prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state); 4253 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) { 4254 spin_unlock(&vc->lock); 4255 schedule(); 4256 spin_lock(&vc->lock); 4257 } 4258 finish_wait(&vcpu->arch.cpu_run, &wait); 4259 } 4260 4261 static void grow_halt_poll_ns(struct kvmppc_vcore *vc) 4262 { 4263 if (!halt_poll_ns_grow) 4264 return; 4265 4266 vc->halt_poll_ns *= halt_poll_ns_grow; 4267 if (vc->halt_poll_ns < halt_poll_ns_grow_start) 4268 vc->halt_poll_ns = halt_poll_ns_grow_start; 4269 } 4270 4271 static void shrink_halt_poll_ns(struct kvmppc_vcore *vc) 4272 { 4273 if (halt_poll_ns_shrink == 0) 4274 vc->halt_poll_ns = 0; 4275 else 4276 vc->halt_poll_ns /= halt_poll_ns_shrink; 4277 } 4278 4279 #ifdef CONFIG_KVM_XICS 4280 static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu) 4281 { 4282 if (!xics_on_xive()) 4283 return false; 4284 return vcpu->arch.irq_pending || vcpu->arch.xive_saved_state.pipr < 4285 vcpu->arch.xive_saved_state.cppr; 4286 } 4287 #else 4288 static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu) 4289 { 4290 return false; 4291 } 4292 #endif /* CONFIG_KVM_XICS */ 4293 4294 static bool kvmppc_vcpu_woken(struct kvm_vcpu *vcpu) 4295 { 4296 if (vcpu->arch.pending_exceptions || vcpu->arch.prodded || 4297 kvmppc_doorbell_pending(vcpu) || xive_interrupt_pending(vcpu)) 4298 return true; 4299 4300 return false; 4301 } 4302 4303 static bool kvmppc_vcpu_check_block(struct kvm_vcpu *vcpu) 4304 { 4305 if (!vcpu->arch.ceded || kvmppc_vcpu_woken(vcpu)) 4306 return true; 4307 return false; 4308 } 4309 4310 /* 4311 * Check to see if any of the runnable vcpus on the vcore have pending 4312 * exceptions or are no longer ceded 4313 */ 4314 static int kvmppc_vcore_check_block(struct kvmppc_vcore *vc) 4315 { 4316 struct kvm_vcpu *vcpu; 4317 int i; 4318 4319 for_each_runnable_thread(i, vcpu, vc) { 4320 if (kvmppc_vcpu_check_block(vcpu)) 4321 return 1; 4322 } 4323 4324 return 0; 4325 } 4326 4327 /* 4328 * All the vcpus in this vcore are idle, so wait for a decrementer 4329 * or external interrupt to one of the vcpus. vc->lock is held. 4330 */ 4331 static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc) 4332 { 4333 ktime_t cur, start_poll, start_wait; 4334 int do_sleep = 1; 4335 u64 block_ns; 4336 4337 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); 4338 4339 /* Poll for pending exceptions and ceded state */ 4340 cur = start_poll = ktime_get(); 4341 if (vc->halt_poll_ns) { 4342 ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns); 4343 ++vc->runner->stat.generic.halt_attempted_poll; 4344 4345 vc->vcore_state = VCORE_POLLING; 4346 spin_unlock(&vc->lock); 4347 4348 do { 4349 if (kvmppc_vcore_check_block(vc)) { 4350 do_sleep = 0; 4351 break; 4352 } 4353 cur = ktime_get(); 4354 } while (kvm_vcpu_can_poll(cur, stop)); 4355 4356 spin_lock(&vc->lock); 4357 vc->vcore_state = VCORE_INACTIVE; 4358 4359 if (!do_sleep) { 4360 ++vc->runner->stat.generic.halt_successful_poll; 4361 goto out; 4362 } 4363 } 4364 4365 prepare_to_rcuwait(&vc->wait); 4366 set_current_state(TASK_INTERRUPTIBLE); 4367 if (kvmppc_vcore_check_block(vc)) { 4368 finish_rcuwait(&vc->wait); 4369 do_sleep = 0; 4370 /* If we polled, count this as a successful poll */ 4371 if (vc->halt_poll_ns) 4372 ++vc->runner->stat.generic.halt_successful_poll; 4373 goto out; 4374 } 4375 4376 start_wait = ktime_get(); 4377 4378 vc->vcore_state = VCORE_SLEEPING; 4379 trace_kvmppc_vcore_blocked(vc->runner, 0); 4380 spin_unlock(&vc->lock); 4381 schedule(); 4382 finish_rcuwait(&vc->wait); 4383 spin_lock(&vc->lock); 4384 vc->vcore_state = VCORE_INACTIVE; 4385 trace_kvmppc_vcore_blocked(vc->runner, 1); 4386 ++vc->runner->stat.halt_successful_wait; 4387 4388 cur = ktime_get(); 4389 4390 out: 4391 block_ns = ktime_to_ns(cur) - ktime_to_ns(start_poll); 4392 4393 /* Attribute wait time */ 4394 if (do_sleep) { 4395 vc->runner->stat.generic.halt_wait_ns += 4396 ktime_to_ns(cur) - ktime_to_ns(start_wait); 4397 KVM_STATS_LOG_HIST_UPDATE( 4398 vc->runner->stat.generic.halt_wait_hist, 4399 ktime_to_ns(cur) - ktime_to_ns(start_wait)); 4400 /* Attribute failed poll time */ 4401 if (vc->halt_poll_ns) { 4402 vc->runner->stat.generic.halt_poll_fail_ns += 4403 ktime_to_ns(start_wait) - 4404 ktime_to_ns(start_poll); 4405 KVM_STATS_LOG_HIST_UPDATE( 4406 vc->runner->stat.generic.halt_poll_fail_hist, 4407 ktime_to_ns(start_wait) - 4408 ktime_to_ns(start_poll)); 4409 } 4410 } else { 4411 /* Attribute successful poll time */ 4412 if (vc->halt_poll_ns) { 4413 vc->runner->stat.generic.halt_poll_success_ns += 4414 ktime_to_ns(cur) - 4415 ktime_to_ns(start_poll); 4416 KVM_STATS_LOG_HIST_UPDATE( 4417 vc->runner->stat.generic.halt_poll_success_hist, 4418 ktime_to_ns(cur) - ktime_to_ns(start_poll)); 4419 } 4420 } 4421 4422 /* Adjust poll time */ 4423 if (halt_poll_ns) { 4424 if (block_ns <= vc->halt_poll_ns) 4425 ; 4426 /* We slept and blocked for longer than the max halt time */ 4427 else if (vc->halt_poll_ns && block_ns > halt_poll_ns) 4428 shrink_halt_poll_ns(vc); 4429 /* We slept and our poll time is too small */ 4430 else if (vc->halt_poll_ns < halt_poll_ns && 4431 block_ns < halt_poll_ns) 4432 grow_halt_poll_ns(vc); 4433 if (vc->halt_poll_ns > halt_poll_ns) 4434 vc->halt_poll_ns = halt_poll_ns; 4435 } else 4436 vc->halt_poll_ns = 0; 4437 4438 trace_kvmppc_vcore_wakeup(do_sleep, block_ns); 4439 } 4440 4441 /* 4442 * This never fails for a radix guest, as none of the operations it does 4443 * for a radix guest can fail or have a way to report failure. 4444 */ 4445 static int kvmhv_setup_mmu(struct kvm_vcpu *vcpu) 4446 { 4447 int r = 0; 4448 struct kvm *kvm = vcpu->kvm; 4449 4450 mutex_lock(&kvm->arch.mmu_setup_lock); 4451 if (!kvm->arch.mmu_ready) { 4452 if (!kvm_is_radix(kvm)) 4453 r = kvmppc_hv_setup_htab_rma(vcpu); 4454 if (!r) { 4455 if (cpu_has_feature(CPU_FTR_ARCH_300)) 4456 kvmppc_setup_partition_table(kvm); 4457 kvm->arch.mmu_ready = 1; 4458 } 4459 } 4460 mutex_unlock(&kvm->arch.mmu_setup_lock); 4461 return r; 4462 } 4463 4464 static int kvmppc_run_vcpu(struct kvm_vcpu *vcpu) 4465 { 4466 struct kvm_run *run = vcpu->run; 4467 int n_ceded, i, r; 4468 struct kvmppc_vcore *vc; 4469 struct kvm_vcpu *v; 4470 4471 trace_kvmppc_run_vcpu_enter(vcpu); 4472 4473 run->exit_reason = 0; 4474 vcpu->arch.ret = RESUME_GUEST; 4475 vcpu->arch.trap = 0; 4476 kvmppc_update_vpas(vcpu); 4477 4478 /* 4479 * Synchronize with other threads in this virtual core 4480 */ 4481 vc = vcpu->arch.vcore; 4482 spin_lock(&vc->lock); 4483 vcpu->arch.ceded = 0; 4484 vcpu->arch.run_task = current; 4485 vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb()); 4486 vcpu->arch.state = KVMPPC_VCPU_RUNNABLE; 4487 vcpu->arch.busy_preempt = TB_NIL; 4488 WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], vcpu); 4489 ++vc->n_runnable; 4490 4491 /* 4492 * This happens the first time this is called for a vcpu. 4493 * If the vcore is already running, we may be able to start 4494 * this thread straight away and have it join in. 4495 */ 4496 if (!signal_pending(current)) { 4497 if ((vc->vcore_state == VCORE_PIGGYBACK || 4498 vc->vcore_state == VCORE_RUNNING) && 4499 !VCORE_IS_EXITING(vc)) { 4500 kvmppc_update_vpa_dispatch(vcpu, vc); 4501 kvmppc_start_thread(vcpu, vc); 4502 trace_kvm_guest_enter(vcpu); 4503 } else if (vc->vcore_state == VCORE_SLEEPING) { 4504 rcuwait_wake_up(&vc->wait); 4505 } 4506 4507 } 4508 4509 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE && 4510 !signal_pending(current)) { 4511 /* See if the MMU is ready to go */ 4512 if (!vcpu->kvm->arch.mmu_ready) { 4513 spin_unlock(&vc->lock); 4514 r = kvmhv_setup_mmu(vcpu); 4515 spin_lock(&vc->lock); 4516 if (r) { 4517 run->exit_reason = KVM_EXIT_FAIL_ENTRY; 4518 run->fail_entry. 4519 hardware_entry_failure_reason = 0; 4520 vcpu->arch.ret = r; 4521 break; 4522 } 4523 } 4524 4525 if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL) 4526 kvmppc_vcore_end_preempt(vc); 4527 4528 if (vc->vcore_state != VCORE_INACTIVE) { 4529 kvmppc_wait_for_exec(vc, vcpu, TASK_INTERRUPTIBLE); 4530 continue; 4531 } 4532 for_each_runnable_thread(i, v, vc) { 4533 kvmppc_core_prepare_to_enter(v); 4534 if (signal_pending(v->arch.run_task)) { 4535 kvmppc_remove_runnable(vc, v, mftb()); 4536 v->stat.signal_exits++; 4537 v->run->exit_reason = KVM_EXIT_INTR; 4538 v->arch.ret = -EINTR; 4539 wake_up(&v->arch.cpu_run); 4540 } 4541 } 4542 if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE) 4543 break; 4544 n_ceded = 0; 4545 for_each_runnable_thread(i, v, vc) { 4546 if (!kvmppc_vcpu_woken(v)) 4547 n_ceded += v->arch.ceded; 4548 else 4549 v->arch.ceded = 0; 4550 } 4551 vc->runner = vcpu; 4552 if (n_ceded == vc->n_runnable) { 4553 kvmppc_vcore_blocked(vc); 4554 } else if (need_resched()) { 4555 kvmppc_vcore_preempt(vc); 4556 /* Let something else run */ 4557 cond_resched_lock(&vc->lock); 4558 if (vc->vcore_state == VCORE_PREEMPT) 4559 kvmppc_vcore_end_preempt(vc); 4560 } else { 4561 kvmppc_run_core(vc); 4562 } 4563 vc->runner = NULL; 4564 } 4565 4566 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE && 4567 (vc->vcore_state == VCORE_RUNNING || 4568 vc->vcore_state == VCORE_EXITING || 4569 vc->vcore_state == VCORE_PIGGYBACK)) 4570 kvmppc_wait_for_exec(vc, vcpu, TASK_UNINTERRUPTIBLE); 4571 4572 if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL) 4573 kvmppc_vcore_end_preempt(vc); 4574 4575 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) { 4576 kvmppc_remove_runnable(vc, vcpu, mftb()); 4577 vcpu->stat.signal_exits++; 4578 run->exit_reason = KVM_EXIT_INTR; 4579 vcpu->arch.ret = -EINTR; 4580 } 4581 4582 if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) { 4583 /* Wake up some vcpu to run the core */ 4584 i = -1; 4585 v = next_runnable_thread(vc, &i); 4586 wake_up(&v->arch.cpu_run); 4587 } 4588 4589 trace_kvmppc_run_vcpu_exit(vcpu); 4590 spin_unlock(&vc->lock); 4591 return vcpu->arch.ret; 4592 } 4593 4594 int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit, 4595 unsigned long lpcr) 4596 { 4597 struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu); 4598 struct kvm_run *run = vcpu->run; 4599 int trap, r, pcpu; 4600 int srcu_idx; 4601 struct kvmppc_vcore *vc; 4602 struct kvm *kvm = vcpu->kvm; 4603 struct kvm_nested_guest *nested = vcpu->arch.nested; 4604 unsigned long flags; 4605 u64 tb; 4606 4607 trace_kvmppc_run_vcpu_enter(vcpu); 4608 4609 run->exit_reason = 0; 4610 vcpu->arch.ret = RESUME_GUEST; 4611 vcpu->arch.trap = 0; 4612 4613 vc = vcpu->arch.vcore; 4614 vcpu->arch.ceded = 0; 4615 vcpu->arch.run_task = current; 4616 vcpu->arch.last_inst = KVM_INST_FETCH_FAILED; 4617 4618 /* See if the MMU is ready to go */ 4619 if (unlikely(!kvm->arch.mmu_ready)) { 4620 r = kvmhv_setup_mmu(vcpu); 4621 if (r) { 4622 run->exit_reason = KVM_EXIT_FAIL_ENTRY; 4623 run->fail_entry.hardware_entry_failure_reason = 0; 4624 vcpu->arch.ret = r; 4625 return r; 4626 } 4627 } 4628 4629 if (need_resched()) 4630 cond_resched(); 4631 4632 kvmppc_update_vpas(vcpu); 4633 4634 preempt_disable(); 4635 pcpu = smp_processor_id(); 4636 if (kvm_is_radix(kvm)) 4637 kvmppc_prepare_radix_vcpu(vcpu, pcpu); 4638 4639 /* flags save not required, but irq_pmu has no disable/enable API */ 4640 powerpc_local_irq_pmu_save(flags); 4641 4642 vcpu->arch.state = KVMPPC_VCPU_RUNNABLE; 4643 4644 if (signal_pending(current)) 4645 goto sigpend; 4646 if (need_resched() || !kvm->arch.mmu_ready) 4647 goto out; 4648 4649 vcpu->cpu = pcpu; 4650 vcpu->arch.thread_cpu = pcpu; 4651 vc->pcpu = pcpu; 4652 local_paca->kvm_hstate.kvm_vcpu = vcpu; 4653 local_paca->kvm_hstate.ptid = 0; 4654 local_paca->kvm_hstate.fake_suspend = 0; 4655 4656 /* 4657 * Orders set cpu/thread_cpu vs testing for pending interrupts and 4658 * doorbells below. The other side is when these fields are set vs 4659 * kvmppc_fast_vcpu_kick_hv reading the cpu/thread_cpu fields to 4660 * kick a vCPU to notice the pending interrupt. 4661 */ 4662 smp_mb(); 4663 4664 if (!nested) { 4665 kvmppc_core_prepare_to_enter(vcpu); 4666 if (test_bit(BOOK3S_IRQPRIO_EXTERNAL, 4667 &vcpu->arch.pending_exceptions) || 4668 xive_interrupt_pending(vcpu)) { 4669 /* 4670 * For nested HV, don't synthesize but always pass MER, 4671 * the L0 will be able to optimise that more 4672 * effectively than manipulating registers directly. 4673 */ 4674 if (!kvmhv_on_pseries() && (__kvmppc_get_msr_hv(vcpu) & MSR_EE)) 4675 kvmppc_inject_interrupt_hv(vcpu, 4676 BOOK3S_INTERRUPT_EXTERNAL, 0); 4677 else 4678 lpcr |= LPCR_MER; 4679 } 4680 } else if (vcpu->arch.pending_exceptions || 4681 vcpu->arch.doorbell_request || 4682 xive_interrupt_pending(vcpu)) { 4683 vcpu->arch.ret = RESUME_HOST; 4684 goto out; 4685 } 4686 4687 if (vcpu->arch.timer_running) { 4688 hrtimer_try_to_cancel(&vcpu->arch.dec_timer); 4689 vcpu->arch.timer_running = 0; 4690 } 4691 4692 tb = mftb(); 4693 4694 kvmppc_update_vpa_dispatch_p9(vcpu, vc, tb + vc->tb_offset); 4695 4696 trace_kvm_guest_enter(vcpu); 4697 4698 guest_timing_enter_irqoff(); 4699 4700 srcu_idx = srcu_read_lock(&kvm->srcu); 4701 4702 guest_state_enter_irqoff(); 4703 this_cpu_disable_ftrace(); 4704 4705 trap = kvmhv_p9_guest_entry(vcpu, time_limit, lpcr, &tb); 4706 vcpu->arch.trap = trap; 4707 4708 this_cpu_enable_ftrace(); 4709 guest_state_exit_irqoff(); 4710 4711 srcu_read_unlock(&kvm->srcu, srcu_idx); 4712 4713 set_irq_happened(trap); 4714 4715 vcpu->cpu = -1; 4716 vcpu->arch.thread_cpu = -1; 4717 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; 4718 4719 if (!vtime_accounting_enabled_this_cpu()) { 4720 powerpc_local_irq_pmu_restore(flags); 4721 /* 4722 * Service IRQs here before guest_timing_exit_irqoff() so any 4723 * ticks that occurred while running the guest are accounted to 4724 * the guest. If vtime accounting is enabled, accounting uses 4725 * TB rather than ticks, so it can be done without enabling 4726 * interrupts here, which has the problem that it accounts 4727 * interrupt processing overhead to the host. 4728 */ 4729 powerpc_local_irq_pmu_save(flags); 4730 } 4731 guest_timing_exit_irqoff(); 4732 4733 powerpc_local_irq_pmu_restore(flags); 4734 4735 preempt_enable(); 4736 4737 /* 4738 * cancel pending decrementer exception if DEC is now positive, or if 4739 * entering a nested guest in which case the decrementer is now owned 4740 * by L2 and the L1 decrementer is provided in hdec_expires 4741 */ 4742 if (kvmppc_core_pending_dec(vcpu) && 4743 ((tb < kvmppc_dec_expires_host_tb(vcpu)) || 4744 (trap == BOOK3S_INTERRUPT_SYSCALL && 4745 kvmppc_get_gpr(vcpu, 3) == H_ENTER_NESTED))) 4746 kvmppc_core_dequeue_dec(vcpu); 4747 4748 trace_kvm_guest_exit(vcpu); 4749 r = RESUME_GUEST; 4750 if (trap) { 4751 if (!nested) 4752 r = kvmppc_handle_exit_hv(vcpu, current); 4753 else 4754 r = kvmppc_handle_nested_exit(vcpu); 4755 } 4756 vcpu->arch.ret = r; 4757 4758 if (is_kvmppc_resume_guest(r) && !kvmppc_vcpu_check_block(vcpu)) { 4759 kvmppc_set_timer(vcpu); 4760 4761 prepare_to_rcuwait(wait); 4762 for (;;) { 4763 set_current_state(TASK_INTERRUPTIBLE); 4764 if (signal_pending(current)) { 4765 vcpu->stat.signal_exits++; 4766 run->exit_reason = KVM_EXIT_INTR; 4767 vcpu->arch.ret = -EINTR; 4768 break; 4769 } 4770 4771 if (kvmppc_vcpu_check_block(vcpu)) 4772 break; 4773 4774 trace_kvmppc_vcore_blocked(vcpu, 0); 4775 schedule(); 4776 trace_kvmppc_vcore_blocked(vcpu, 1); 4777 } 4778 finish_rcuwait(wait); 4779 } 4780 vcpu->arch.ceded = 0; 4781 4782 done: 4783 trace_kvmppc_run_vcpu_exit(vcpu); 4784 4785 return vcpu->arch.ret; 4786 4787 sigpend: 4788 vcpu->stat.signal_exits++; 4789 run->exit_reason = KVM_EXIT_INTR; 4790 vcpu->arch.ret = -EINTR; 4791 out: 4792 vcpu->cpu = -1; 4793 vcpu->arch.thread_cpu = -1; 4794 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; 4795 powerpc_local_irq_pmu_restore(flags); 4796 preempt_enable(); 4797 goto done; 4798 } 4799 4800 static int kvmppc_vcpu_run_hv(struct kvm_vcpu *vcpu) 4801 { 4802 struct kvm_run *run = vcpu->run; 4803 int r; 4804 int srcu_idx; 4805 struct kvm *kvm; 4806 unsigned long msr; 4807 4808 start_timing(vcpu, &vcpu->arch.vcpu_entry); 4809 4810 if (!vcpu->arch.sane) { 4811 run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 4812 return -EINVAL; 4813 } 4814 4815 /* No need to go into the guest when all we'll do is come back out */ 4816 if (signal_pending(current)) { 4817 run->exit_reason = KVM_EXIT_INTR; 4818 return -EINTR; 4819 } 4820 4821 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 4822 /* 4823 * Don't allow entry with a suspended transaction, because 4824 * the guest entry/exit code will lose it. 4825 */ 4826 if (cpu_has_feature(CPU_FTR_TM) && current->thread.regs && 4827 (current->thread.regs->msr & MSR_TM)) { 4828 if (MSR_TM_ACTIVE(current->thread.regs->msr)) { 4829 run->exit_reason = KVM_EXIT_FAIL_ENTRY; 4830 run->fail_entry.hardware_entry_failure_reason = 0; 4831 return -EINVAL; 4832 } 4833 } 4834 #endif 4835 4836 /* 4837 * Force online to 1 for the sake of old userspace which doesn't 4838 * set it. 4839 */ 4840 if (!vcpu->arch.online) { 4841 atomic_inc(&vcpu->arch.vcore->online_count); 4842 vcpu->arch.online = 1; 4843 } 4844 4845 kvmppc_core_prepare_to_enter(vcpu); 4846 4847 kvm = vcpu->kvm; 4848 atomic_inc(&kvm->arch.vcpus_running); 4849 /* Order vcpus_running vs. mmu_ready, see kvmppc_alloc_reset_hpt */ 4850 smp_mb(); 4851 4852 msr = 0; 4853 if (IS_ENABLED(CONFIG_PPC_FPU)) 4854 msr |= MSR_FP; 4855 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 4856 msr |= MSR_VEC; 4857 if (cpu_has_feature(CPU_FTR_VSX)) 4858 msr |= MSR_VSX; 4859 if ((cpu_has_feature(CPU_FTR_TM) || 4860 cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) && 4861 (kvmppc_get_hfscr_hv(vcpu) & HFSCR_TM)) 4862 msr |= MSR_TM; 4863 msr = msr_check_and_set(msr); 4864 4865 kvmppc_save_user_regs(); 4866 4867 kvmppc_save_current_sprs(); 4868 4869 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 4870 vcpu->arch.waitp = &vcpu->arch.vcore->wait; 4871 vcpu->arch.pgdir = kvm->mm->pgd; 4872 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; 4873 4874 do { 4875 accumulate_time(vcpu, &vcpu->arch.guest_entry); 4876 if (cpu_has_feature(CPU_FTR_ARCH_300)) 4877 r = kvmhv_run_single_vcpu(vcpu, ~(u64)0, 4878 vcpu->arch.vcore->lpcr); 4879 else 4880 r = kvmppc_run_vcpu(vcpu); 4881 4882 if (run->exit_reason == KVM_EXIT_PAPR_HCALL) { 4883 accumulate_time(vcpu, &vcpu->arch.hcall); 4884 4885 if (WARN_ON_ONCE(__kvmppc_get_msr_hv(vcpu) & MSR_PR)) { 4886 /* 4887 * These should have been caught reflected 4888 * into the guest by now. Final sanity check: 4889 * don't allow userspace to execute hcalls in 4890 * the hypervisor. 4891 */ 4892 r = RESUME_GUEST; 4893 continue; 4894 } 4895 trace_kvm_hcall_enter(vcpu); 4896 r = kvmppc_pseries_do_hcall(vcpu); 4897 trace_kvm_hcall_exit(vcpu, r); 4898 kvmppc_core_prepare_to_enter(vcpu); 4899 } else if (r == RESUME_PAGE_FAULT) { 4900 accumulate_time(vcpu, &vcpu->arch.pg_fault); 4901 srcu_idx = srcu_read_lock(&kvm->srcu); 4902 r = kvmppc_book3s_hv_page_fault(vcpu, 4903 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); 4904 srcu_read_unlock(&kvm->srcu, srcu_idx); 4905 } else if (r == RESUME_PASSTHROUGH) { 4906 if (WARN_ON(xics_on_xive())) 4907 r = H_SUCCESS; 4908 else 4909 r = kvmppc_xics_rm_complete(vcpu, 0); 4910 } 4911 } while (is_kvmppc_resume_guest(r)); 4912 accumulate_time(vcpu, &vcpu->arch.vcpu_exit); 4913 4914 vcpu->arch.state = KVMPPC_VCPU_NOTREADY; 4915 atomic_dec(&kvm->arch.vcpus_running); 4916 4917 srr_regs_clobbered(); 4918 4919 end_timing(vcpu); 4920 4921 return r; 4922 } 4923 4924 static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps, 4925 int shift, int sllp) 4926 { 4927 (*sps)->page_shift = shift; 4928 (*sps)->slb_enc = sllp; 4929 (*sps)->enc[0].page_shift = shift; 4930 (*sps)->enc[0].pte_enc = kvmppc_pgsize_lp_encoding(shift, shift); 4931 /* 4932 * Add 16MB MPSS support (may get filtered out by userspace) 4933 */ 4934 if (shift != 24) { 4935 int penc = kvmppc_pgsize_lp_encoding(shift, 24); 4936 if (penc != -1) { 4937 (*sps)->enc[1].page_shift = 24; 4938 (*sps)->enc[1].pte_enc = penc; 4939 } 4940 } 4941 (*sps)++; 4942 } 4943 4944 static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm, 4945 struct kvm_ppc_smmu_info *info) 4946 { 4947 struct kvm_ppc_one_seg_page_size *sps; 4948 4949 /* 4950 * POWER7, POWER8 and POWER9 all support 32 storage keys for data. 4951 * POWER7 doesn't support keys for instruction accesses, 4952 * POWER8 and POWER9 do. 4953 */ 4954 info->data_keys = 32; 4955 info->instr_keys = cpu_has_feature(CPU_FTR_ARCH_207S) ? 32 : 0; 4956 4957 /* POWER7, 8 and 9 all have 1T segments and 32-entry SLB */ 4958 info->flags = KVM_PPC_PAGE_SIZES_REAL | KVM_PPC_1T_SEGMENTS; 4959 info->slb_size = 32; 4960 4961 /* We only support these sizes for now, and no muti-size segments */ 4962 sps = &info->sps[0]; 4963 kvmppc_add_seg_page_size(&sps, 12, 0); 4964 kvmppc_add_seg_page_size(&sps, 16, SLB_VSID_L | SLB_VSID_LP_01); 4965 kvmppc_add_seg_page_size(&sps, 24, SLB_VSID_L); 4966 4967 /* If running as a nested hypervisor, we don't support HPT guests */ 4968 if (kvmhv_on_pseries()) 4969 info->flags |= KVM_PPC_NO_HASH; 4970 4971 return 0; 4972 } 4973 4974 /* 4975 * Get (and clear) the dirty memory log for a memory slot. 4976 */ 4977 static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm, 4978 struct kvm_dirty_log *log) 4979 { 4980 struct kvm_memslots *slots; 4981 struct kvm_memory_slot *memslot; 4982 int r; 4983 unsigned long n, i; 4984 unsigned long *buf, *p; 4985 struct kvm_vcpu *vcpu; 4986 4987 mutex_lock(&kvm->slots_lock); 4988 4989 r = -EINVAL; 4990 if (log->slot >= KVM_USER_MEM_SLOTS) 4991 goto out; 4992 4993 slots = kvm_memslots(kvm); 4994 memslot = id_to_memslot(slots, log->slot); 4995 r = -ENOENT; 4996 if (!memslot || !memslot->dirty_bitmap) 4997 goto out; 4998 4999 /* 5000 * Use second half of bitmap area because both HPT and radix 5001 * accumulate bits in the first half. 5002 */ 5003 n = kvm_dirty_bitmap_bytes(memslot); 5004 buf = memslot->dirty_bitmap + n / sizeof(long); 5005 memset(buf, 0, n); 5006 5007 if (kvm_is_radix(kvm)) 5008 r = kvmppc_hv_get_dirty_log_radix(kvm, memslot, buf); 5009 else 5010 r = kvmppc_hv_get_dirty_log_hpt(kvm, memslot, buf); 5011 if (r) 5012 goto out; 5013 5014 /* 5015 * We accumulate dirty bits in the first half of the 5016 * memslot's dirty_bitmap area, for when pages are paged 5017 * out or modified by the host directly. Pick up these 5018 * bits and add them to the map. 5019 */ 5020 p = memslot->dirty_bitmap; 5021 for (i = 0; i < n / sizeof(long); ++i) 5022 buf[i] |= xchg(&p[i], 0); 5023 5024 /* Harvest dirty bits from VPA and DTL updates */ 5025 /* Note: we never modify the SLB shadow buffer areas */ 5026 kvm_for_each_vcpu(i, vcpu, kvm) { 5027 spin_lock(&vcpu->arch.vpa_update_lock); 5028 kvmppc_harvest_vpa_dirty(&vcpu->arch.vpa, memslot, buf); 5029 kvmppc_harvest_vpa_dirty(&vcpu->arch.dtl, memslot, buf); 5030 spin_unlock(&vcpu->arch.vpa_update_lock); 5031 } 5032 5033 r = -EFAULT; 5034 if (copy_to_user(log->dirty_bitmap, buf, n)) 5035 goto out; 5036 5037 r = 0; 5038 out: 5039 mutex_unlock(&kvm->slots_lock); 5040 return r; 5041 } 5042 5043 static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *slot) 5044 { 5045 vfree(slot->arch.rmap); 5046 slot->arch.rmap = NULL; 5047 } 5048 5049 static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm, 5050 const struct kvm_memory_slot *old, 5051 struct kvm_memory_slot *new, 5052 enum kvm_mr_change change) 5053 { 5054 if (change == KVM_MR_CREATE) { 5055 unsigned long size = array_size(new->npages, sizeof(*new->arch.rmap)); 5056 5057 if ((size >> PAGE_SHIFT) > totalram_pages()) 5058 return -ENOMEM; 5059 5060 new->arch.rmap = vzalloc(size); 5061 if (!new->arch.rmap) 5062 return -ENOMEM; 5063 } else if (change != KVM_MR_DELETE) { 5064 new->arch.rmap = old->arch.rmap; 5065 } 5066 5067 return 0; 5068 } 5069 5070 static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm, 5071 struct kvm_memory_slot *old, 5072 const struct kvm_memory_slot *new, 5073 enum kvm_mr_change change) 5074 { 5075 /* 5076 * If we are creating or modifying a memslot, it might make 5077 * some address that was previously cached as emulated 5078 * MMIO be no longer emulated MMIO, so invalidate 5079 * all the caches of emulated MMIO translations. 5080 */ 5081 if (change != KVM_MR_DELETE) 5082 atomic64_inc(&kvm->arch.mmio_update); 5083 5084 /* 5085 * For change == KVM_MR_MOVE or KVM_MR_DELETE, higher levels 5086 * have already called kvm_arch_flush_shadow_memslot() to 5087 * flush shadow mappings. For KVM_MR_CREATE we have no 5088 * previous mappings. So the only case to handle is 5089 * KVM_MR_FLAGS_ONLY when the KVM_MEM_LOG_DIRTY_PAGES bit 5090 * has been changed. 5091 * For radix guests, we flush on setting KVM_MEM_LOG_DIRTY_PAGES 5092 * to get rid of any THP PTEs in the partition-scoped page tables 5093 * so we can track dirtiness at the page level; we flush when 5094 * clearing KVM_MEM_LOG_DIRTY_PAGES so that we can go back to 5095 * using THP PTEs. 5096 */ 5097 if (change == KVM_MR_FLAGS_ONLY && kvm_is_radix(kvm) && 5098 ((new->flags ^ old->flags) & KVM_MEM_LOG_DIRTY_PAGES)) 5099 kvmppc_radix_flush_memslot(kvm, old); 5100 /* 5101 * If UV hasn't yet called H_SVM_INIT_START, don't register memslots. 5102 */ 5103 if (!kvm->arch.secure_guest) 5104 return; 5105 5106 switch (change) { 5107 case KVM_MR_CREATE: 5108 /* 5109 * @TODO kvmppc_uvmem_memslot_create() can fail and 5110 * return error. Fix this. 5111 */ 5112 kvmppc_uvmem_memslot_create(kvm, new); 5113 break; 5114 case KVM_MR_DELETE: 5115 kvmppc_uvmem_memslot_delete(kvm, old); 5116 break; 5117 default: 5118 /* TODO: Handle KVM_MR_MOVE */ 5119 break; 5120 } 5121 } 5122 5123 /* 5124 * Update LPCR values in kvm->arch and in vcores. 5125 * Caller must hold kvm->arch.mmu_setup_lock (for mutual exclusion 5126 * of kvm->arch.lpcr update). 5127 */ 5128 void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask) 5129 { 5130 long int i; 5131 u32 cores_done = 0; 5132 5133 if ((kvm->arch.lpcr & mask) == lpcr) 5134 return; 5135 5136 kvm->arch.lpcr = (kvm->arch.lpcr & ~mask) | lpcr; 5137 5138 for (i = 0; i < KVM_MAX_VCORES; ++i) { 5139 struct kvmppc_vcore *vc = kvm->arch.vcores[i]; 5140 if (!vc) 5141 continue; 5142 5143 spin_lock(&vc->lock); 5144 vc->lpcr = (vc->lpcr & ~mask) | lpcr; 5145 verify_lpcr(kvm, vc->lpcr); 5146 spin_unlock(&vc->lock); 5147 if (++cores_done >= kvm->arch.online_vcores) 5148 break; 5149 } 5150 } 5151 5152 void kvmppc_setup_partition_table(struct kvm *kvm) 5153 { 5154 unsigned long dw0, dw1; 5155 5156 if (!kvm_is_radix(kvm)) { 5157 /* PS field - page size for VRMA */ 5158 dw0 = ((kvm->arch.vrma_slb_v & SLB_VSID_L) >> 1) | 5159 ((kvm->arch.vrma_slb_v & SLB_VSID_LP) << 1); 5160 /* HTABSIZE and HTABORG fields */ 5161 dw0 |= kvm->arch.sdr1; 5162 5163 /* Second dword as set by userspace */ 5164 dw1 = kvm->arch.process_table; 5165 } else { 5166 dw0 = PATB_HR | radix__get_tree_size() | 5167 __pa(kvm->arch.pgtable) | RADIX_PGD_INDEX_SIZE; 5168 dw1 = PATB_GR | kvm->arch.process_table; 5169 } 5170 kvmhv_set_ptbl_entry(kvm->arch.lpid, dw0, dw1); 5171 } 5172 5173 /* 5174 * Set up HPT (hashed page table) and RMA (real-mode area). 5175 * Must be called with kvm->arch.mmu_setup_lock held. 5176 */ 5177 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu) 5178 { 5179 int err = 0; 5180 struct kvm *kvm = vcpu->kvm; 5181 unsigned long hva; 5182 struct kvm_memory_slot *memslot; 5183 struct vm_area_struct *vma; 5184 unsigned long lpcr = 0, senc; 5185 unsigned long psize, porder; 5186 int srcu_idx; 5187 5188 /* Allocate hashed page table (if not done already) and reset it */ 5189 if (!kvm->arch.hpt.virt) { 5190 int order = KVM_DEFAULT_HPT_ORDER; 5191 struct kvm_hpt_info info; 5192 5193 err = kvmppc_allocate_hpt(&info, order); 5194 /* If we get here, it means userspace didn't specify a 5195 * size explicitly. So, try successively smaller 5196 * sizes if the default failed. */ 5197 while ((err == -ENOMEM) && --order >= PPC_MIN_HPT_ORDER) 5198 err = kvmppc_allocate_hpt(&info, order); 5199 5200 if (err < 0) { 5201 pr_err("KVM: Couldn't alloc HPT\n"); 5202 goto out; 5203 } 5204 5205 kvmppc_set_hpt(kvm, &info); 5206 } 5207 5208 /* Look up the memslot for guest physical address 0 */ 5209 srcu_idx = srcu_read_lock(&kvm->srcu); 5210 memslot = gfn_to_memslot(kvm, 0); 5211 5212 /* We must have some memory at 0 by now */ 5213 err = -EINVAL; 5214 if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) 5215 goto out_srcu; 5216 5217 /* Look up the VMA for the start of this memory slot */ 5218 hva = memslot->userspace_addr; 5219 mmap_read_lock(kvm->mm); 5220 vma = vma_lookup(kvm->mm, hva); 5221 if (!vma || (vma->vm_flags & VM_IO)) 5222 goto up_out; 5223 5224 psize = vma_kernel_pagesize(vma); 5225 5226 mmap_read_unlock(kvm->mm); 5227 5228 /* We can handle 4k, 64k or 16M pages in the VRMA */ 5229 if (psize >= 0x1000000) 5230 psize = 0x1000000; 5231 else if (psize >= 0x10000) 5232 psize = 0x10000; 5233 else 5234 psize = 0x1000; 5235 porder = __ilog2(psize); 5236 5237 senc = slb_pgsize_encoding(psize); 5238 kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T | 5239 (VRMA_VSID << SLB_VSID_SHIFT_1T); 5240 /* Create HPTEs in the hash page table for the VRMA */ 5241 kvmppc_map_vrma(vcpu, memslot, porder); 5242 5243 /* Update VRMASD field in the LPCR */ 5244 if (!cpu_has_feature(CPU_FTR_ARCH_300)) { 5245 /* the -4 is to account for senc values starting at 0x10 */ 5246 lpcr = senc << (LPCR_VRMASD_SH - 4); 5247 kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD); 5248 } 5249 5250 /* Order updates to kvm->arch.lpcr etc. vs. mmu_ready */ 5251 smp_wmb(); 5252 err = 0; 5253 out_srcu: 5254 srcu_read_unlock(&kvm->srcu, srcu_idx); 5255 out: 5256 return err; 5257 5258 up_out: 5259 mmap_read_unlock(kvm->mm); 5260 goto out_srcu; 5261 } 5262 5263 /* 5264 * Must be called with kvm->arch.mmu_setup_lock held and 5265 * mmu_ready = 0 and no vcpus running. 5266 */ 5267 int kvmppc_switch_mmu_to_hpt(struct kvm *kvm) 5268 { 5269 unsigned long lpcr, lpcr_mask; 5270 5271 if (nesting_enabled(kvm)) 5272 kvmhv_release_all_nested(kvm); 5273 kvmppc_rmap_reset(kvm); 5274 kvm->arch.process_table = 0; 5275 /* Mutual exclusion with kvm_unmap_gfn_range etc. */ 5276 spin_lock(&kvm->mmu_lock); 5277 kvm->arch.radix = 0; 5278 spin_unlock(&kvm->mmu_lock); 5279 kvmppc_free_radix(kvm); 5280 5281 lpcr = LPCR_VPM1; 5282 lpcr_mask = LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR; 5283 if (cpu_has_feature(CPU_FTR_ARCH_31)) 5284 lpcr_mask |= LPCR_HAIL; 5285 kvmppc_update_lpcr(kvm, lpcr, lpcr_mask); 5286 5287 return 0; 5288 } 5289 5290 /* 5291 * Must be called with kvm->arch.mmu_setup_lock held and 5292 * mmu_ready = 0 and no vcpus running. 5293 */ 5294 int kvmppc_switch_mmu_to_radix(struct kvm *kvm) 5295 { 5296 unsigned long lpcr, lpcr_mask; 5297 int err; 5298 5299 err = kvmppc_init_vm_radix(kvm); 5300 if (err) 5301 return err; 5302 kvmppc_rmap_reset(kvm); 5303 /* Mutual exclusion with kvm_unmap_gfn_range etc. */ 5304 spin_lock(&kvm->mmu_lock); 5305 kvm->arch.radix = 1; 5306 spin_unlock(&kvm->mmu_lock); 5307 kvmppc_free_hpt(&kvm->arch.hpt); 5308 5309 lpcr = LPCR_UPRT | LPCR_GTSE | LPCR_HR; 5310 lpcr_mask = LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR; 5311 if (cpu_has_feature(CPU_FTR_ARCH_31)) { 5312 lpcr_mask |= LPCR_HAIL; 5313 if (cpu_has_feature(CPU_FTR_HVMODE) && 5314 (kvm->arch.host_lpcr & LPCR_HAIL)) 5315 lpcr |= LPCR_HAIL; 5316 } 5317 kvmppc_update_lpcr(kvm, lpcr, lpcr_mask); 5318 5319 return 0; 5320 } 5321 5322 #ifdef CONFIG_KVM_XICS 5323 /* 5324 * Allocate a per-core structure for managing state about which cores are 5325 * running in the host versus the guest and for exchanging data between 5326 * real mode KVM and CPU running in the host. 5327 * This is only done for the first VM. 5328 * The allocated structure stays even if all VMs have stopped. 5329 * It is only freed when the kvm-hv module is unloaded. 5330 * It's OK for this routine to fail, we just don't support host 5331 * core operations like redirecting H_IPI wakeups. 5332 */ 5333 void kvmppc_alloc_host_rm_ops(void) 5334 { 5335 struct kvmppc_host_rm_ops *ops; 5336 unsigned long l_ops; 5337 int cpu, core; 5338 int size; 5339 5340 if (cpu_has_feature(CPU_FTR_ARCH_300)) 5341 return; 5342 5343 /* Not the first time here ? */ 5344 if (kvmppc_host_rm_ops_hv != NULL) 5345 return; 5346 5347 ops = kzalloc(sizeof(struct kvmppc_host_rm_ops), GFP_KERNEL); 5348 if (!ops) 5349 return; 5350 5351 size = cpu_nr_cores() * sizeof(struct kvmppc_host_rm_core); 5352 ops->rm_core = kzalloc(size, GFP_KERNEL); 5353 5354 if (!ops->rm_core) { 5355 kfree(ops); 5356 return; 5357 } 5358 5359 cpus_read_lock(); 5360 5361 for (cpu = 0; cpu < nr_cpu_ids; cpu += threads_per_core) { 5362 if (!cpu_online(cpu)) 5363 continue; 5364 5365 core = cpu >> threads_shift; 5366 ops->rm_core[core].rm_state.in_host = 1; 5367 } 5368 5369 ops->vcpu_kick = kvmppc_fast_vcpu_kick_hv; 5370 5371 /* 5372 * Make the contents of the kvmppc_host_rm_ops structure visible 5373 * to other CPUs before we assign it to the global variable. 5374 * Do an atomic assignment (no locks used here), but if someone 5375 * beats us to it, just free our copy and return. 5376 */ 5377 smp_wmb(); 5378 l_ops = (unsigned long) ops; 5379 5380 if (cmpxchg64((unsigned long *)&kvmppc_host_rm_ops_hv, 0, l_ops)) { 5381 cpus_read_unlock(); 5382 kfree(ops->rm_core); 5383 kfree(ops); 5384 return; 5385 } 5386 5387 cpuhp_setup_state_nocalls_cpuslocked(CPUHP_KVM_PPC_BOOK3S_PREPARE, 5388 "ppc/kvm_book3s:prepare", 5389 kvmppc_set_host_core, 5390 kvmppc_clear_host_core); 5391 cpus_read_unlock(); 5392 } 5393 5394 void kvmppc_free_host_rm_ops(void) 5395 { 5396 if (kvmppc_host_rm_ops_hv) { 5397 cpuhp_remove_state_nocalls(CPUHP_KVM_PPC_BOOK3S_PREPARE); 5398 kfree(kvmppc_host_rm_ops_hv->rm_core); 5399 kfree(kvmppc_host_rm_ops_hv); 5400 kvmppc_host_rm_ops_hv = NULL; 5401 } 5402 } 5403 #endif 5404 5405 static int kvmppc_core_init_vm_hv(struct kvm *kvm) 5406 { 5407 unsigned long lpcr, lpid; 5408 int ret; 5409 5410 mutex_init(&kvm->arch.uvmem_lock); 5411 INIT_LIST_HEAD(&kvm->arch.uvmem_pfns); 5412 mutex_init(&kvm->arch.mmu_setup_lock); 5413 5414 /* Allocate the guest's logical partition ID */ 5415 5416 lpid = kvmppc_alloc_lpid(); 5417 if ((long)lpid < 0) 5418 return -ENOMEM; 5419 kvm->arch.lpid = lpid; 5420 5421 kvmppc_alloc_host_rm_ops(); 5422 5423 kvmhv_vm_nested_init(kvm); 5424 5425 /* 5426 * Since we don't flush the TLB when tearing down a VM, 5427 * and this lpid might have previously been used, 5428 * make sure we flush on each core before running the new VM. 5429 * On POWER9, the tlbie in mmu_partition_table_set_entry() 5430 * does this flush for us. 5431 */ 5432 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5433 cpumask_setall(&kvm->arch.need_tlb_flush); 5434 5435 /* Start out with the default set of hcalls enabled */ 5436 memcpy(kvm->arch.enabled_hcalls, default_enabled_hcalls, 5437 sizeof(kvm->arch.enabled_hcalls)); 5438 5439 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5440 kvm->arch.host_sdr1 = mfspr(SPRN_SDR1); 5441 5442 /* Init LPCR for virtual RMA mode */ 5443 if (cpu_has_feature(CPU_FTR_HVMODE)) { 5444 kvm->arch.host_lpid = mfspr(SPRN_LPID); 5445 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR); 5446 lpcr &= LPCR_PECE | LPCR_LPES; 5447 } else { 5448 /* 5449 * The L2 LPES mode will be set by the L0 according to whether 5450 * or not it needs to take external interrupts in HV mode. 5451 */ 5452 lpcr = 0; 5453 } 5454 lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE | 5455 LPCR_VPM0 | LPCR_VPM1; 5456 kvm->arch.vrma_slb_v = SLB_VSID_B_1T | 5457 (VRMA_VSID << SLB_VSID_SHIFT_1T); 5458 /* On POWER8 turn on online bit to enable PURR/SPURR */ 5459 if (cpu_has_feature(CPU_FTR_ARCH_207S)) 5460 lpcr |= LPCR_ONL; 5461 /* 5462 * On POWER9, VPM0 bit is reserved (VPM0=1 behaviour is assumed) 5463 * Set HVICE bit to enable hypervisor virtualization interrupts. 5464 * Set HEIC to prevent OS interrupts to go to hypervisor (should 5465 * be unnecessary but better safe than sorry in case we re-enable 5466 * EE in HV mode with this LPCR still set) 5467 */ 5468 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 5469 lpcr &= ~LPCR_VPM0; 5470 lpcr |= LPCR_HVICE | LPCR_HEIC; 5471 5472 /* 5473 * If xive is enabled, we route 0x500 interrupts directly 5474 * to the guest. 5475 */ 5476 if (xics_on_xive()) 5477 lpcr |= LPCR_LPES; 5478 } 5479 5480 /* 5481 * If the host uses radix, the guest starts out as radix. 5482 */ 5483 if (radix_enabled()) { 5484 kvm->arch.radix = 1; 5485 kvm->arch.mmu_ready = 1; 5486 lpcr &= ~LPCR_VPM1; 5487 lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR; 5488 if (cpu_has_feature(CPU_FTR_HVMODE) && 5489 cpu_has_feature(CPU_FTR_ARCH_31) && 5490 (kvm->arch.host_lpcr & LPCR_HAIL)) 5491 lpcr |= LPCR_HAIL; 5492 ret = kvmppc_init_vm_radix(kvm); 5493 if (ret) { 5494 kvmppc_free_lpid(kvm->arch.lpid); 5495 return ret; 5496 } 5497 kvmppc_setup_partition_table(kvm); 5498 } 5499 5500 verify_lpcr(kvm, lpcr); 5501 kvm->arch.lpcr = lpcr; 5502 5503 /* Initialization for future HPT resizes */ 5504 kvm->arch.resize_hpt = NULL; 5505 5506 /* 5507 * Work out how many sets the TLB has, for the use of 5508 * the TLB invalidation loop in book3s_hv_rmhandlers.S. 5509 */ 5510 if (cpu_has_feature(CPU_FTR_ARCH_31)) { 5511 /* 5512 * P10 will flush all the congruence class with a single tlbiel 5513 */ 5514 kvm->arch.tlb_sets = 1; 5515 } else if (radix_enabled()) 5516 kvm->arch.tlb_sets = POWER9_TLB_SETS_RADIX; /* 128 */ 5517 else if (cpu_has_feature(CPU_FTR_ARCH_300)) 5518 kvm->arch.tlb_sets = POWER9_TLB_SETS_HASH; /* 256 */ 5519 else if (cpu_has_feature(CPU_FTR_ARCH_207S)) 5520 kvm->arch.tlb_sets = POWER8_TLB_SETS; /* 512 */ 5521 else 5522 kvm->arch.tlb_sets = POWER7_TLB_SETS; /* 128 */ 5523 5524 /* 5525 * Track that we now have a HV mode VM active. This blocks secondary 5526 * CPU threads from coming online. 5527 */ 5528 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5529 kvm_hv_vm_activated(); 5530 5531 /* 5532 * Initialize smt_mode depending on processor. 5533 * POWER8 and earlier have to use "strict" threading, where 5534 * all vCPUs in a vcore have to run on the same (sub)core, 5535 * whereas on POWER9 the threads can each run a different 5536 * guest. 5537 */ 5538 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5539 kvm->arch.smt_mode = threads_per_subcore; 5540 else 5541 kvm->arch.smt_mode = 1; 5542 kvm->arch.emul_smt_mode = 1; 5543 5544 return 0; 5545 } 5546 5547 static int kvmppc_arch_create_vm_debugfs_hv(struct kvm *kvm) 5548 { 5549 kvmppc_mmu_debugfs_init(kvm); 5550 if (radix_enabled()) 5551 kvmhv_radix_debugfs_init(kvm); 5552 return 0; 5553 } 5554 5555 static void kvmppc_free_vcores(struct kvm *kvm) 5556 { 5557 long int i; 5558 5559 for (i = 0; i < KVM_MAX_VCORES; ++i) 5560 kfree(kvm->arch.vcores[i]); 5561 kvm->arch.online_vcores = 0; 5562 } 5563 5564 static void kvmppc_core_destroy_vm_hv(struct kvm *kvm) 5565 { 5566 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5567 kvm_hv_vm_deactivated(); 5568 5569 kvmppc_free_vcores(kvm); 5570 5571 5572 if (kvm_is_radix(kvm)) 5573 kvmppc_free_radix(kvm); 5574 else 5575 kvmppc_free_hpt(&kvm->arch.hpt); 5576 5577 /* Perform global invalidation and return lpid to the pool */ 5578 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 5579 if (nesting_enabled(kvm)) 5580 kvmhv_release_all_nested(kvm); 5581 kvm->arch.process_table = 0; 5582 if (kvm->arch.secure_guest) 5583 uv_svm_terminate(kvm->arch.lpid); 5584 kvmhv_set_ptbl_entry(kvm->arch.lpid, 0, 0); 5585 } 5586 5587 kvmppc_free_lpid(kvm->arch.lpid); 5588 5589 kvmppc_free_pimap(kvm); 5590 } 5591 5592 /* We don't need to emulate any privileged instructions or dcbz */ 5593 static int kvmppc_core_emulate_op_hv(struct kvm_vcpu *vcpu, 5594 unsigned int inst, int *advance) 5595 { 5596 return EMULATE_FAIL; 5597 } 5598 5599 static int kvmppc_core_emulate_mtspr_hv(struct kvm_vcpu *vcpu, int sprn, 5600 ulong spr_val) 5601 { 5602 return EMULATE_FAIL; 5603 } 5604 5605 static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn, 5606 ulong *spr_val) 5607 { 5608 return EMULATE_FAIL; 5609 } 5610 5611 static int kvmppc_core_check_processor_compat_hv(void) 5612 { 5613 if (cpu_has_feature(CPU_FTR_HVMODE) && 5614 cpu_has_feature(CPU_FTR_ARCH_206)) 5615 return 0; 5616 5617 /* POWER9 in radix mode is capable of being a nested hypervisor. */ 5618 if (cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled()) 5619 return 0; 5620 5621 return -EIO; 5622 } 5623 5624 #ifdef CONFIG_KVM_XICS 5625 5626 void kvmppc_free_pimap(struct kvm *kvm) 5627 { 5628 kfree(kvm->arch.pimap); 5629 } 5630 5631 static struct kvmppc_passthru_irqmap *kvmppc_alloc_pimap(void) 5632 { 5633 return kzalloc(sizeof(struct kvmppc_passthru_irqmap), GFP_KERNEL); 5634 } 5635 5636 static int kvmppc_set_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi) 5637 { 5638 struct irq_desc *desc; 5639 struct kvmppc_irq_map *irq_map; 5640 struct kvmppc_passthru_irqmap *pimap; 5641 struct irq_chip *chip; 5642 int i, rc = 0; 5643 struct irq_data *host_data; 5644 5645 if (!kvm_irq_bypass) 5646 return 1; 5647 5648 desc = irq_to_desc(host_irq); 5649 if (!desc) 5650 return -EIO; 5651 5652 mutex_lock(&kvm->lock); 5653 5654 pimap = kvm->arch.pimap; 5655 if (pimap == NULL) { 5656 /* First call, allocate structure to hold IRQ map */ 5657 pimap = kvmppc_alloc_pimap(); 5658 if (pimap == NULL) { 5659 mutex_unlock(&kvm->lock); 5660 return -ENOMEM; 5661 } 5662 kvm->arch.pimap = pimap; 5663 } 5664 5665 /* 5666 * For now, we only support interrupts for which the EOI operation 5667 * is an OPAL call followed by a write to XIRR, since that's 5668 * what our real-mode EOI code does, or a XIVE interrupt 5669 */ 5670 chip = irq_data_get_irq_chip(&desc->irq_data); 5671 if (!chip || !is_pnv_opal_msi(chip)) { 5672 pr_warn("kvmppc_set_passthru_irq_hv: Could not assign IRQ map for (%d,%d)\n", 5673 host_irq, guest_gsi); 5674 mutex_unlock(&kvm->lock); 5675 return -ENOENT; 5676 } 5677 5678 /* 5679 * See if we already have an entry for this guest IRQ number. 5680 * If it's mapped to a hardware IRQ number, that's an error, 5681 * otherwise re-use this entry. 5682 */ 5683 for (i = 0; i < pimap->n_mapped; i++) { 5684 if (guest_gsi == pimap->mapped[i].v_hwirq) { 5685 if (pimap->mapped[i].r_hwirq) { 5686 mutex_unlock(&kvm->lock); 5687 return -EINVAL; 5688 } 5689 break; 5690 } 5691 } 5692 5693 if (i == KVMPPC_PIRQ_MAPPED) { 5694 mutex_unlock(&kvm->lock); 5695 return -EAGAIN; /* table is full */ 5696 } 5697 5698 irq_map = &pimap->mapped[i]; 5699 5700 irq_map->v_hwirq = guest_gsi; 5701 irq_map->desc = desc; 5702 5703 /* 5704 * Order the above two stores before the next to serialize with 5705 * the KVM real mode handler. 5706 */ 5707 smp_wmb(); 5708 5709 /* 5710 * The 'host_irq' number is mapped in the PCI-MSI domain but 5711 * the underlying calls, which will EOI the interrupt in real 5712 * mode, need an HW IRQ number mapped in the XICS IRQ domain. 5713 */ 5714 host_data = irq_domain_get_irq_data(irq_get_default_host(), host_irq); 5715 irq_map->r_hwirq = (unsigned int)irqd_to_hwirq(host_data); 5716 5717 if (i == pimap->n_mapped) 5718 pimap->n_mapped++; 5719 5720 if (xics_on_xive()) 5721 rc = kvmppc_xive_set_mapped(kvm, guest_gsi, host_irq); 5722 else 5723 kvmppc_xics_set_mapped(kvm, guest_gsi, irq_map->r_hwirq); 5724 if (rc) 5725 irq_map->r_hwirq = 0; 5726 5727 mutex_unlock(&kvm->lock); 5728 5729 return 0; 5730 } 5731 5732 static int kvmppc_clr_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi) 5733 { 5734 struct irq_desc *desc; 5735 struct kvmppc_passthru_irqmap *pimap; 5736 int i, rc = 0; 5737 5738 if (!kvm_irq_bypass) 5739 return 0; 5740 5741 desc = irq_to_desc(host_irq); 5742 if (!desc) 5743 return -EIO; 5744 5745 mutex_lock(&kvm->lock); 5746 if (!kvm->arch.pimap) 5747 goto unlock; 5748 5749 pimap = kvm->arch.pimap; 5750 5751 for (i = 0; i < pimap->n_mapped; i++) { 5752 if (guest_gsi == pimap->mapped[i].v_hwirq) 5753 break; 5754 } 5755 5756 if (i == pimap->n_mapped) { 5757 mutex_unlock(&kvm->lock); 5758 return -ENODEV; 5759 } 5760 5761 if (xics_on_xive()) 5762 rc = kvmppc_xive_clr_mapped(kvm, guest_gsi, host_irq); 5763 else 5764 kvmppc_xics_clr_mapped(kvm, guest_gsi, pimap->mapped[i].r_hwirq); 5765 5766 /* invalidate the entry (what to do on error from the above ?) */ 5767 pimap->mapped[i].r_hwirq = 0; 5768 5769 /* 5770 * We don't free this structure even when the count goes to 5771 * zero. The structure is freed when we destroy the VM. 5772 */ 5773 unlock: 5774 mutex_unlock(&kvm->lock); 5775 return rc; 5776 } 5777 5778 static int kvmppc_irq_bypass_add_producer_hv(struct irq_bypass_consumer *cons, 5779 struct irq_bypass_producer *prod) 5780 { 5781 int ret = 0; 5782 struct kvm_kernel_irqfd *irqfd = 5783 container_of(cons, struct kvm_kernel_irqfd, consumer); 5784 5785 irqfd->producer = prod; 5786 5787 ret = kvmppc_set_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi); 5788 if (ret) 5789 pr_info("kvmppc_set_passthru_irq (irq %d, gsi %d) fails: %d\n", 5790 prod->irq, irqfd->gsi, ret); 5791 5792 return ret; 5793 } 5794 5795 static void kvmppc_irq_bypass_del_producer_hv(struct irq_bypass_consumer *cons, 5796 struct irq_bypass_producer *prod) 5797 { 5798 int ret; 5799 struct kvm_kernel_irqfd *irqfd = 5800 container_of(cons, struct kvm_kernel_irqfd, consumer); 5801 5802 irqfd->producer = NULL; 5803 5804 /* 5805 * When producer of consumer is unregistered, we change back to 5806 * default external interrupt handling mode - KVM real mode 5807 * will switch back to host. 5808 */ 5809 ret = kvmppc_clr_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi); 5810 if (ret) 5811 pr_warn("kvmppc_clr_passthru_irq (irq %d, gsi %d) fails: %d\n", 5812 prod->irq, irqfd->gsi, ret); 5813 } 5814 #endif 5815 5816 static int kvm_arch_vm_ioctl_hv(struct file *filp, 5817 unsigned int ioctl, unsigned long arg) 5818 { 5819 struct kvm *kvm __maybe_unused = filp->private_data; 5820 void __user *argp = (void __user *)arg; 5821 int r; 5822 5823 switch (ioctl) { 5824 5825 case KVM_PPC_ALLOCATE_HTAB: { 5826 u32 htab_order; 5827 5828 /* If we're a nested hypervisor, we currently only support radix */ 5829 if (kvmhv_on_pseries()) { 5830 r = -EOPNOTSUPP; 5831 break; 5832 } 5833 5834 r = -EFAULT; 5835 if (get_user(htab_order, (u32 __user *)argp)) 5836 break; 5837 r = kvmppc_alloc_reset_hpt(kvm, htab_order); 5838 if (r) 5839 break; 5840 r = 0; 5841 break; 5842 } 5843 5844 case KVM_PPC_GET_HTAB_FD: { 5845 struct kvm_get_htab_fd ghf; 5846 5847 r = -EFAULT; 5848 if (copy_from_user(&ghf, argp, sizeof(ghf))) 5849 break; 5850 r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf); 5851 break; 5852 } 5853 5854 case KVM_PPC_RESIZE_HPT_PREPARE: { 5855 struct kvm_ppc_resize_hpt rhpt; 5856 5857 r = -EFAULT; 5858 if (copy_from_user(&rhpt, argp, sizeof(rhpt))) 5859 break; 5860 5861 r = kvm_vm_ioctl_resize_hpt_prepare(kvm, &rhpt); 5862 break; 5863 } 5864 5865 case KVM_PPC_RESIZE_HPT_COMMIT: { 5866 struct kvm_ppc_resize_hpt rhpt; 5867 5868 r = -EFAULT; 5869 if (copy_from_user(&rhpt, argp, sizeof(rhpt))) 5870 break; 5871 5872 r = kvm_vm_ioctl_resize_hpt_commit(kvm, &rhpt); 5873 break; 5874 } 5875 5876 default: 5877 r = -ENOTTY; 5878 } 5879 5880 return r; 5881 } 5882 5883 /* 5884 * List of hcall numbers to enable by default. 5885 * For compatibility with old userspace, we enable by default 5886 * all hcalls that were implemented before the hcall-enabling 5887 * facility was added. Note this list should not include H_RTAS. 5888 */ 5889 static unsigned int default_hcall_list[] = { 5890 H_REMOVE, 5891 H_ENTER, 5892 H_READ, 5893 H_PROTECT, 5894 H_BULK_REMOVE, 5895 #ifdef CONFIG_SPAPR_TCE_IOMMU 5896 H_GET_TCE, 5897 H_PUT_TCE, 5898 #endif 5899 H_SET_DABR, 5900 H_SET_XDABR, 5901 H_CEDE, 5902 H_PROD, 5903 H_CONFER, 5904 H_REGISTER_VPA, 5905 #ifdef CONFIG_KVM_XICS 5906 H_EOI, 5907 H_CPPR, 5908 H_IPI, 5909 H_IPOLL, 5910 H_XIRR, 5911 H_XIRR_X, 5912 #endif 5913 0 5914 }; 5915 5916 static void init_default_hcalls(void) 5917 { 5918 int i; 5919 unsigned int hcall; 5920 5921 for (i = 0; default_hcall_list[i]; ++i) { 5922 hcall = default_hcall_list[i]; 5923 WARN_ON(!kvmppc_hcall_impl_hv(hcall)); 5924 __set_bit(hcall / 4, default_enabled_hcalls); 5925 } 5926 } 5927 5928 static int kvmhv_configure_mmu(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg) 5929 { 5930 unsigned long lpcr; 5931 int radix; 5932 int err; 5933 5934 /* If not on a POWER9, reject it */ 5935 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5936 return -ENODEV; 5937 5938 /* If any unknown flags set, reject it */ 5939 if (cfg->flags & ~(KVM_PPC_MMUV3_RADIX | KVM_PPC_MMUV3_GTSE)) 5940 return -EINVAL; 5941 5942 /* GR (guest radix) bit in process_table field must match */ 5943 radix = !!(cfg->flags & KVM_PPC_MMUV3_RADIX); 5944 if (!!(cfg->process_table & PATB_GR) != radix) 5945 return -EINVAL; 5946 5947 /* Process table size field must be reasonable, i.e. <= 24 */ 5948 if ((cfg->process_table & PRTS_MASK) > 24) 5949 return -EINVAL; 5950 5951 /* We can change a guest to/from radix now, if the host is radix */ 5952 if (radix && !radix_enabled()) 5953 return -EINVAL; 5954 5955 /* If we're a nested hypervisor, we currently only support radix */ 5956 if (kvmhv_on_pseries() && !radix) 5957 return -EINVAL; 5958 5959 mutex_lock(&kvm->arch.mmu_setup_lock); 5960 if (radix != kvm_is_radix(kvm)) { 5961 if (kvm->arch.mmu_ready) { 5962 kvm->arch.mmu_ready = 0; 5963 /* order mmu_ready vs. vcpus_running */ 5964 smp_mb(); 5965 if (atomic_read(&kvm->arch.vcpus_running)) { 5966 kvm->arch.mmu_ready = 1; 5967 err = -EBUSY; 5968 goto out_unlock; 5969 } 5970 } 5971 if (radix) 5972 err = kvmppc_switch_mmu_to_radix(kvm); 5973 else 5974 err = kvmppc_switch_mmu_to_hpt(kvm); 5975 if (err) 5976 goto out_unlock; 5977 } 5978 5979 kvm->arch.process_table = cfg->process_table; 5980 kvmppc_setup_partition_table(kvm); 5981 5982 lpcr = (cfg->flags & KVM_PPC_MMUV3_GTSE) ? LPCR_GTSE : 0; 5983 kvmppc_update_lpcr(kvm, lpcr, LPCR_GTSE); 5984 err = 0; 5985 5986 out_unlock: 5987 mutex_unlock(&kvm->arch.mmu_setup_lock); 5988 return err; 5989 } 5990 5991 static int kvmhv_enable_nested(struct kvm *kvm) 5992 { 5993 if (!nested) 5994 return -EPERM; 5995 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5996 return -ENODEV; 5997 if (!radix_enabled()) 5998 return -ENODEV; 5999 6000 /* kvm == NULL means the caller is testing if the capability exists */ 6001 if (kvm) 6002 kvm->arch.nested_enable = true; 6003 return 0; 6004 } 6005 6006 static int kvmhv_load_from_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr, 6007 int size) 6008 { 6009 int rc = -EINVAL; 6010 6011 if (kvmhv_vcpu_is_radix(vcpu)) { 6012 rc = kvmhv_copy_from_guest_radix(vcpu, *eaddr, ptr, size); 6013 6014 if (rc > 0) 6015 rc = -EINVAL; 6016 } 6017 6018 /* For now quadrants are the only way to access nested guest memory */ 6019 if (rc && vcpu->arch.nested) 6020 rc = -EAGAIN; 6021 6022 return rc; 6023 } 6024 6025 static int kvmhv_store_to_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr, 6026 int size) 6027 { 6028 int rc = -EINVAL; 6029 6030 if (kvmhv_vcpu_is_radix(vcpu)) { 6031 rc = kvmhv_copy_to_guest_radix(vcpu, *eaddr, ptr, size); 6032 6033 if (rc > 0) 6034 rc = -EINVAL; 6035 } 6036 6037 /* For now quadrants are the only way to access nested guest memory */ 6038 if (rc && vcpu->arch.nested) 6039 rc = -EAGAIN; 6040 6041 return rc; 6042 } 6043 6044 static void unpin_vpa_reset(struct kvm *kvm, struct kvmppc_vpa *vpa) 6045 { 6046 unpin_vpa(kvm, vpa); 6047 vpa->gpa = 0; 6048 vpa->pinned_addr = NULL; 6049 vpa->dirty = false; 6050 vpa->update_pending = 0; 6051 } 6052 6053 /* 6054 * Enable a guest to become a secure VM, or test whether 6055 * that could be enabled. 6056 * Called when the KVM_CAP_PPC_SECURE_GUEST capability is 6057 * tested (kvm == NULL) or enabled (kvm != NULL). 6058 */ 6059 static int kvmhv_enable_svm(struct kvm *kvm) 6060 { 6061 if (!kvmppc_uvmem_available()) 6062 return -EINVAL; 6063 if (kvm) 6064 kvm->arch.svm_enabled = 1; 6065 return 0; 6066 } 6067 6068 /* 6069 * IOCTL handler to turn off secure mode of guest 6070 * 6071 * - Release all device pages 6072 * - Issue ucall to terminate the guest on the UV side 6073 * - Unpin the VPA pages. 6074 * - Reinit the partition scoped page tables 6075 */ 6076 static int kvmhv_svm_off(struct kvm *kvm) 6077 { 6078 struct kvm_vcpu *vcpu; 6079 int mmu_was_ready; 6080 int srcu_idx; 6081 int ret = 0; 6082 unsigned long i; 6083 6084 if (!(kvm->arch.secure_guest & KVMPPC_SECURE_INIT_START)) 6085 return ret; 6086 6087 mutex_lock(&kvm->arch.mmu_setup_lock); 6088 mmu_was_ready = kvm->arch.mmu_ready; 6089 if (kvm->arch.mmu_ready) { 6090 kvm->arch.mmu_ready = 0; 6091 /* order mmu_ready vs. vcpus_running */ 6092 smp_mb(); 6093 if (atomic_read(&kvm->arch.vcpus_running)) { 6094 kvm->arch.mmu_ready = 1; 6095 ret = -EBUSY; 6096 goto out; 6097 } 6098 } 6099 6100 srcu_idx = srcu_read_lock(&kvm->srcu); 6101 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { 6102 struct kvm_memory_slot *memslot; 6103 struct kvm_memslots *slots = __kvm_memslots(kvm, i); 6104 int bkt; 6105 6106 if (!slots) 6107 continue; 6108 6109 kvm_for_each_memslot(memslot, bkt, slots) { 6110 kvmppc_uvmem_drop_pages(memslot, kvm, true); 6111 uv_unregister_mem_slot(kvm->arch.lpid, memslot->id); 6112 } 6113 } 6114 srcu_read_unlock(&kvm->srcu, srcu_idx); 6115 6116 ret = uv_svm_terminate(kvm->arch.lpid); 6117 if (ret != U_SUCCESS) { 6118 ret = -EINVAL; 6119 goto out; 6120 } 6121 6122 /* 6123 * When secure guest is reset, all the guest pages are sent 6124 * to UV via UV_PAGE_IN before the non-boot vcpus get a 6125 * chance to run and unpin their VPA pages. Unpinning of all 6126 * VPA pages is done here explicitly so that VPA pages 6127 * can be migrated to the secure side. 6128 * 6129 * This is required to for the secure SMP guest to reboot 6130 * correctly. 6131 */ 6132 kvm_for_each_vcpu(i, vcpu, kvm) { 6133 spin_lock(&vcpu->arch.vpa_update_lock); 6134 unpin_vpa_reset(kvm, &vcpu->arch.dtl); 6135 unpin_vpa_reset(kvm, &vcpu->arch.slb_shadow); 6136 unpin_vpa_reset(kvm, &vcpu->arch.vpa); 6137 spin_unlock(&vcpu->arch.vpa_update_lock); 6138 } 6139 6140 kvmppc_setup_partition_table(kvm); 6141 kvm->arch.secure_guest = 0; 6142 kvm->arch.mmu_ready = mmu_was_ready; 6143 out: 6144 mutex_unlock(&kvm->arch.mmu_setup_lock); 6145 return ret; 6146 } 6147 6148 static int kvmhv_enable_dawr1(struct kvm *kvm) 6149 { 6150 if (!cpu_has_feature(CPU_FTR_DAWR1)) 6151 return -ENODEV; 6152 6153 /* kvm == NULL means the caller is testing if the capability exists */ 6154 if (kvm) 6155 kvm->arch.dawr1_enabled = true; 6156 return 0; 6157 } 6158 6159 static bool kvmppc_hash_v3_possible(void) 6160 { 6161 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 6162 return false; 6163 6164 if (!cpu_has_feature(CPU_FTR_HVMODE)) 6165 return false; 6166 6167 /* 6168 * POWER9 chips before version 2.02 can't have some threads in 6169 * HPT mode and some in radix mode on the same core. 6170 */ 6171 if (radix_enabled()) { 6172 unsigned int pvr = mfspr(SPRN_PVR); 6173 if ((pvr >> 16) == PVR_POWER9 && 6174 (((pvr & 0xe000) == 0 && (pvr & 0xfff) < 0x202) || 6175 ((pvr & 0xe000) == 0x2000 && (pvr & 0xfff) < 0x101))) 6176 return false; 6177 } 6178 6179 return true; 6180 } 6181 6182 static struct kvmppc_ops kvm_ops_hv = { 6183 .get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv, 6184 .set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv, 6185 .get_one_reg = kvmppc_get_one_reg_hv, 6186 .set_one_reg = kvmppc_set_one_reg_hv, 6187 .vcpu_load = kvmppc_core_vcpu_load_hv, 6188 .vcpu_put = kvmppc_core_vcpu_put_hv, 6189 .inject_interrupt = kvmppc_inject_interrupt_hv, 6190 .set_msr = kvmppc_set_msr_hv, 6191 .vcpu_run = kvmppc_vcpu_run_hv, 6192 .vcpu_create = kvmppc_core_vcpu_create_hv, 6193 .vcpu_free = kvmppc_core_vcpu_free_hv, 6194 .check_requests = kvmppc_core_check_requests_hv, 6195 .get_dirty_log = kvm_vm_ioctl_get_dirty_log_hv, 6196 .flush_memslot = kvmppc_core_flush_memslot_hv, 6197 .prepare_memory_region = kvmppc_core_prepare_memory_region_hv, 6198 .commit_memory_region = kvmppc_core_commit_memory_region_hv, 6199 .unmap_gfn_range = kvm_unmap_gfn_range_hv, 6200 .age_gfn = kvm_age_gfn_hv, 6201 .test_age_gfn = kvm_test_age_gfn_hv, 6202 .set_spte_gfn = kvm_set_spte_gfn_hv, 6203 .free_memslot = kvmppc_core_free_memslot_hv, 6204 .init_vm = kvmppc_core_init_vm_hv, 6205 .destroy_vm = kvmppc_core_destroy_vm_hv, 6206 .get_smmu_info = kvm_vm_ioctl_get_smmu_info_hv, 6207 .emulate_op = kvmppc_core_emulate_op_hv, 6208 .emulate_mtspr = kvmppc_core_emulate_mtspr_hv, 6209 .emulate_mfspr = kvmppc_core_emulate_mfspr_hv, 6210 .fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv, 6211 .arch_vm_ioctl = kvm_arch_vm_ioctl_hv, 6212 .hcall_implemented = kvmppc_hcall_impl_hv, 6213 #ifdef CONFIG_KVM_XICS 6214 .irq_bypass_add_producer = kvmppc_irq_bypass_add_producer_hv, 6215 .irq_bypass_del_producer = kvmppc_irq_bypass_del_producer_hv, 6216 #endif 6217 .configure_mmu = kvmhv_configure_mmu, 6218 .get_rmmu_info = kvmhv_get_rmmu_info, 6219 .set_smt_mode = kvmhv_set_smt_mode, 6220 .enable_nested = kvmhv_enable_nested, 6221 .load_from_eaddr = kvmhv_load_from_eaddr, 6222 .store_to_eaddr = kvmhv_store_to_eaddr, 6223 .enable_svm = kvmhv_enable_svm, 6224 .svm_off = kvmhv_svm_off, 6225 .enable_dawr1 = kvmhv_enable_dawr1, 6226 .hash_v3_possible = kvmppc_hash_v3_possible, 6227 .create_vcpu_debugfs = kvmppc_arch_create_vcpu_debugfs_hv, 6228 .create_vm_debugfs = kvmppc_arch_create_vm_debugfs_hv, 6229 }; 6230 6231 static int kvm_init_subcore_bitmap(void) 6232 { 6233 int i, j; 6234 int nr_cores = cpu_nr_cores(); 6235 struct sibling_subcore_state *sibling_subcore_state; 6236 6237 for (i = 0; i < nr_cores; i++) { 6238 int first_cpu = i * threads_per_core; 6239 int node = cpu_to_node(first_cpu); 6240 6241 /* Ignore if it is already allocated. */ 6242 if (paca_ptrs[first_cpu]->sibling_subcore_state) 6243 continue; 6244 6245 sibling_subcore_state = 6246 kzalloc_node(sizeof(struct sibling_subcore_state), 6247 GFP_KERNEL, node); 6248 if (!sibling_subcore_state) 6249 return -ENOMEM; 6250 6251 6252 for (j = 0; j < threads_per_core; j++) { 6253 int cpu = first_cpu + j; 6254 6255 paca_ptrs[cpu]->sibling_subcore_state = 6256 sibling_subcore_state; 6257 } 6258 } 6259 return 0; 6260 } 6261 6262 static int kvmppc_radix_possible(void) 6263 { 6264 return cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled(); 6265 } 6266 6267 static int kvmppc_book3s_init_hv(void) 6268 { 6269 int r; 6270 6271 if (!tlbie_capable) { 6272 pr_err("KVM-HV: Host does not support TLBIE\n"); 6273 return -ENODEV; 6274 } 6275 6276 /* 6277 * FIXME!! Do we need to check on all cpus ? 6278 */ 6279 r = kvmppc_core_check_processor_compat_hv(); 6280 if (r < 0) 6281 return -ENODEV; 6282 6283 r = kvmhv_nested_init(); 6284 if (r) 6285 return r; 6286 6287 if (!cpu_has_feature(CPU_FTR_ARCH_300)) { 6288 r = kvm_init_subcore_bitmap(); 6289 if (r) 6290 goto err; 6291 } 6292 6293 /* 6294 * We need a way of accessing the XICS interrupt controller, 6295 * either directly, via paca_ptrs[cpu]->kvm_hstate.xics_phys, or 6296 * indirectly, via OPAL. 6297 */ 6298 #ifdef CONFIG_SMP 6299 if (!xics_on_xive() && !kvmhv_on_pseries() && 6300 !local_paca->kvm_hstate.xics_phys) { 6301 struct device_node *np; 6302 6303 np = of_find_compatible_node(NULL, NULL, "ibm,opal-intc"); 6304 if (!np) { 6305 pr_err("KVM-HV: Cannot determine method for accessing XICS\n"); 6306 r = -ENODEV; 6307 goto err; 6308 } 6309 /* presence of intc confirmed - node can be dropped again */ 6310 of_node_put(np); 6311 } 6312 #endif 6313 6314 init_default_hcalls(); 6315 6316 init_vcore_lists(); 6317 6318 r = kvmppc_mmu_hv_init(); 6319 if (r) 6320 goto err; 6321 6322 if (kvmppc_radix_possible()) { 6323 r = kvmppc_radix_init(); 6324 if (r) 6325 goto err; 6326 } 6327 6328 r = kvmppc_uvmem_init(); 6329 if (r < 0) { 6330 pr_err("KVM-HV: kvmppc_uvmem_init failed %d\n", r); 6331 return r; 6332 } 6333 6334 kvm_ops_hv.owner = THIS_MODULE; 6335 kvmppc_hv_ops = &kvm_ops_hv; 6336 6337 return 0; 6338 6339 err: 6340 kvmhv_nested_exit(); 6341 kvmppc_radix_exit(); 6342 6343 return r; 6344 } 6345 6346 static void kvmppc_book3s_exit_hv(void) 6347 { 6348 kvmppc_uvmem_free(); 6349 kvmppc_free_host_rm_ops(); 6350 if (kvmppc_radix_possible()) 6351 kvmppc_radix_exit(); 6352 kvmppc_hv_ops = NULL; 6353 kvmhv_nested_exit(); 6354 } 6355 6356 module_init(kvmppc_book3s_init_hv); 6357 module_exit(kvmppc_book3s_exit_hv); 6358 MODULE_LICENSE("GPL"); 6359 MODULE_ALIAS_MISCDEV(KVM_MINOR); 6360 MODULE_ALIAS("devname:kvm"); 6361