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 47 #include <asm/ftrace.h> 48 #include <asm/reg.h> 49 #include <asm/ppc-opcode.h> 50 #include <asm/asm-prototypes.h> 51 #include <asm/archrandom.h> 52 #include <asm/debug.h> 53 #include <asm/disassemble.h> 54 #include <asm/cputable.h> 55 #include <asm/cacheflush.h> 56 #include <linux/uaccess.h> 57 #include <asm/interrupt.h> 58 #include <asm/io.h> 59 #include <asm/kvm_ppc.h> 60 #include <asm/kvm_book3s.h> 61 #include <asm/mmu_context.h> 62 #include <asm/lppaca.h> 63 #include <asm/pmc.h> 64 #include <asm/processor.h> 65 #include <asm/cputhreads.h> 66 #include <asm/page.h> 67 #include <asm/hvcall.h> 68 #include <asm/switch_to.h> 69 #include <asm/smp.h> 70 #include <asm/dbell.h> 71 #include <asm/hmi.h> 72 #include <asm/pnv-pci.h> 73 #include <asm/mmu.h> 74 #include <asm/opal.h> 75 #include <asm/xics.h> 76 #include <asm/xive.h> 77 #include <asm/hw_breakpoint.h> 78 #include <asm/kvm_book3s_uvmem.h> 79 #include <asm/ultravisor.h> 80 #include <asm/dtl.h> 81 #include <asm/plpar_wrappers.h> 82 83 #include "book3s.h" 84 #include "book3s_hv.h" 85 86 #define CREATE_TRACE_POINTS 87 #include "trace_hv.h" 88 89 /* #define EXIT_DEBUG */ 90 /* #define EXIT_DEBUG_SIMPLE */ 91 /* #define EXIT_DEBUG_INT */ 92 93 /* Used to indicate that a guest page fault needs to be handled */ 94 #define RESUME_PAGE_FAULT (RESUME_GUEST | RESUME_FLAG_ARCH1) 95 /* Used to indicate that a guest passthrough interrupt needs to be handled */ 96 #define RESUME_PASSTHROUGH (RESUME_GUEST | RESUME_FLAG_ARCH2) 97 98 /* Used as a "null" value for timebase values */ 99 #define TB_NIL (~(u64)0) 100 101 static DECLARE_BITMAP(default_enabled_hcalls, MAX_HCALL_OPCODE/4 + 1); 102 103 static int dynamic_mt_modes = 6; 104 module_param(dynamic_mt_modes, int, 0644); 105 MODULE_PARM_DESC(dynamic_mt_modes, "Set of allowed dynamic micro-threading modes: 0 (= none), 2, 4, or 6 (= 2 or 4)"); 106 static int target_smt_mode; 107 module_param(target_smt_mode, int, 0644); 108 MODULE_PARM_DESC(target_smt_mode, "Target threads per core (0 = max)"); 109 110 static bool one_vm_per_core; 111 module_param(one_vm_per_core, bool, S_IRUGO | S_IWUSR); 112 MODULE_PARM_DESC(one_vm_per_core, "Only run vCPUs from the same VM on a core (requires POWER8 or older)"); 113 114 #ifdef CONFIG_KVM_XICS 115 static const struct kernel_param_ops module_param_ops = { 116 .set = param_set_int, 117 .get = param_get_int, 118 }; 119 120 module_param_cb(kvm_irq_bypass, &module_param_ops, &kvm_irq_bypass, 0644); 121 MODULE_PARM_DESC(kvm_irq_bypass, "Bypass passthrough interrupt optimization"); 122 123 module_param_cb(h_ipi_redirect, &module_param_ops, &h_ipi_redirect, 0644); 124 MODULE_PARM_DESC(h_ipi_redirect, "Redirect H_IPI wakeup to a free host core"); 125 #endif 126 127 /* If set, guests are allowed to create and control nested guests */ 128 static bool nested = true; 129 module_param(nested, bool, S_IRUGO | S_IWUSR); 130 MODULE_PARM_DESC(nested, "Enable nested virtualization (only on POWER9)"); 131 132 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu); 133 134 /* 135 * RWMR values for POWER8. These control the rate at which PURR 136 * and SPURR count and should be set according to the number of 137 * online threads in the vcore being run. 138 */ 139 #define RWMR_RPA_P8_1THREAD 0x164520C62609AECAUL 140 #define RWMR_RPA_P8_2THREAD 0x7FFF2908450D8DA9UL 141 #define RWMR_RPA_P8_3THREAD 0x164520C62609AECAUL 142 #define RWMR_RPA_P8_4THREAD 0x199A421245058DA9UL 143 #define RWMR_RPA_P8_5THREAD 0x164520C62609AECAUL 144 #define RWMR_RPA_P8_6THREAD 0x164520C62609AECAUL 145 #define RWMR_RPA_P8_7THREAD 0x164520C62609AECAUL 146 #define RWMR_RPA_P8_8THREAD 0x164520C62609AECAUL 147 148 static unsigned long p8_rwmr_values[MAX_SMT_THREADS + 1] = { 149 RWMR_RPA_P8_1THREAD, 150 RWMR_RPA_P8_1THREAD, 151 RWMR_RPA_P8_2THREAD, 152 RWMR_RPA_P8_3THREAD, 153 RWMR_RPA_P8_4THREAD, 154 RWMR_RPA_P8_5THREAD, 155 RWMR_RPA_P8_6THREAD, 156 RWMR_RPA_P8_7THREAD, 157 RWMR_RPA_P8_8THREAD, 158 }; 159 160 static inline struct kvm_vcpu *next_runnable_thread(struct kvmppc_vcore *vc, 161 int *ip) 162 { 163 int i = *ip; 164 struct kvm_vcpu *vcpu; 165 166 while (++i < MAX_SMT_THREADS) { 167 vcpu = READ_ONCE(vc->runnable_threads[i]); 168 if (vcpu) { 169 *ip = i; 170 return vcpu; 171 } 172 } 173 return NULL; 174 } 175 176 /* Used to traverse the list of runnable threads for a given vcore */ 177 #define for_each_runnable_thread(i, vcpu, vc) \ 178 for (i = -1; (vcpu = next_runnable_thread(vc, &i)); ) 179 180 static bool kvmppc_ipi_thread(int cpu) 181 { 182 unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER); 183 184 /* If we're a nested hypervisor, fall back to ordinary IPIs for now */ 185 if (kvmhv_on_pseries()) 186 return false; 187 188 /* On POWER9 we can use msgsnd to IPI any cpu */ 189 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 190 msg |= get_hard_smp_processor_id(cpu); 191 smp_mb(); 192 __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg)); 193 return true; 194 } 195 196 /* On POWER8 for IPIs to threads in the same core, use msgsnd */ 197 if (cpu_has_feature(CPU_FTR_ARCH_207S)) { 198 preempt_disable(); 199 if (cpu_first_thread_sibling(cpu) == 200 cpu_first_thread_sibling(smp_processor_id())) { 201 msg |= cpu_thread_in_core(cpu); 202 smp_mb(); 203 __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg)); 204 preempt_enable(); 205 return true; 206 } 207 preempt_enable(); 208 } 209 210 #if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP) 211 if (cpu >= 0 && cpu < nr_cpu_ids) { 212 if (paca_ptrs[cpu]->kvm_hstate.xics_phys) { 213 xics_wake_cpu(cpu); 214 return true; 215 } 216 opal_int_set_mfrr(get_hard_smp_processor_id(cpu), IPI_PRIORITY); 217 return true; 218 } 219 #endif 220 221 return false; 222 } 223 224 static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu) 225 { 226 int cpu; 227 struct rcuwait *waitp; 228 229 /* 230 * rcuwait_wake_up contains smp_mb() which orders prior stores that 231 * create pending work vs below loads of cpu fields. The other side 232 * is the barrier in vcpu run that orders setting the cpu fields vs 233 * testing for pending work. 234 */ 235 236 waitp = kvm_arch_vcpu_get_wait(vcpu); 237 if (rcuwait_wake_up(waitp)) 238 ++vcpu->stat.generic.halt_wakeup; 239 240 cpu = READ_ONCE(vcpu->arch.thread_cpu); 241 if (cpu >= 0 && kvmppc_ipi_thread(cpu)) 242 return; 243 244 /* CPU points to the first thread of the core */ 245 cpu = vcpu->cpu; 246 if (cpu >= 0 && cpu < nr_cpu_ids && cpu_online(cpu)) 247 smp_send_reschedule(cpu); 248 } 249 250 /* 251 * We use the vcpu_load/put functions to measure stolen time. 252 * Stolen time is counted as time when either the vcpu is able to 253 * run as part of a virtual core, but the task running the vcore 254 * is preempted or sleeping, or when the vcpu needs something done 255 * in the kernel by the task running the vcpu, but that task is 256 * preempted or sleeping. Those two things have to be counted 257 * separately, since one of the vcpu tasks will take on the job 258 * of running the core, and the other vcpu tasks in the vcore will 259 * sleep waiting for it to do that, but that sleep shouldn't count 260 * as stolen time. 261 * 262 * Hence we accumulate stolen time when the vcpu can run as part of 263 * a vcore using vc->stolen_tb, and the stolen time when the vcpu 264 * needs its task to do other things in the kernel (for example, 265 * service a page fault) in busy_stolen. We don't accumulate 266 * stolen time for a vcore when it is inactive, or for a vcpu 267 * when it is in state RUNNING or NOTREADY. NOTREADY is a bit of 268 * a misnomer; it means that the vcpu task is not executing in 269 * the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in 270 * the kernel. We don't have any way of dividing up that time 271 * between time that the vcpu is genuinely stopped, time that 272 * the task is actively working on behalf of the vcpu, and time 273 * that the task is preempted, so we don't count any of it as 274 * stolen. 275 * 276 * Updates to busy_stolen are protected by arch.tbacct_lock; 277 * updates to vc->stolen_tb are protected by the vcore->stoltb_lock 278 * lock. The stolen times are measured in units of timebase ticks. 279 * (Note that the != TB_NIL checks below are purely defensive; 280 * they should never fail.) 281 */ 282 283 static void kvmppc_core_start_stolen(struct kvmppc_vcore *vc, u64 tb) 284 { 285 unsigned long flags; 286 287 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); 288 289 spin_lock_irqsave(&vc->stoltb_lock, flags); 290 vc->preempt_tb = tb; 291 spin_unlock_irqrestore(&vc->stoltb_lock, flags); 292 } 293 294 static void kvmppc_core_end_stolen(struct kvmppc_vcore *vc, u64 tb) 295 { 296 unsigned long flags; 297 298 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); 299 300 spin_lock_irqsave(&vc->stoltb_lock, flags); 301 if (vc->preempt_tb != TB_NIL) { 302 vc->stolen_tb += tb - vc->preempt_tb; 303 vc->preempt_tb = TB_NIL; 304 } 305 spin_unlock_irqrestore(&vc->stoltb_lock, flags); 306 } 307 308 static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu) 309 { 310 struct kvmppc_vcore *vc = vcpu->arch.vcore; 311 unsigned long flags; 312 u64 now; 313 314 if (cpu_has_feature(CPU_FTR_ARCH_300)) 315 return; 316 317 now = mftb(); 318 319 /* 320 * We can test vc->runner without taking the vcore lock, 321 * because only this task ever sets vc->runner to this 322 * vcpu, and once it is set to this vcpu, only this task 323 * ever sets it to NULL. 324 */ 325 if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING) 326 kvmppc_core_end_stolen(vc, now); 327 328 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); 329 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST && 330 vcpu->arch.busy_preempt != TB_NIL) { 331 vcpu->arch.busy_stolen += now - vcpu->arch.busy_preempt; 332 vcpu->arch.busy_preempt = TB_NIL; 333 } 334 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); 335 } 336 337 static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu) 338 { 339 struct kvmppc_vcore *vc = vcpu->arch.vcore; 340 unsigned long flags; 341 u64 now; 342 343 if (cpu_has_feature(CPU_FTR_ARCH_300)) 344 return; 345 346 now = mftb(); 347 348 if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING) 349 kvmppc_core_start_stolen(vc, now); 350 351 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); 352 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST) 353 vcpu->arch.busy_preempt = now; 354 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); 355 } 356 357 static void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr) 358 { 359 vcpu->arch.pvr = pvr; 360 } 361 362 /* Dummy value used in computing PCR value below */ 363 #define PCR_ARCH_31 (PCR_ARCH_300 << 1) 364 365 static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat) 366 { 367 unsigned long host_pcr_bit = 0, guest_pcr_bit = 0; 368 struct kvmppc_vcore *vc = vcpu->arch.vcore; 369 370 /* We can (emulate) our own architecture version and anything older */ 371 if (cpu_has_feature(CPU_FTR_ARCH_31)) 372 host_pcr_bit = PCR_ARCH_31; 373 else if (cpu_has_feature(CPU_FTR_ARCH_300)) 374 host_pcr_bit = PCR_ARCH_300; 375 else if (cpu_has_feature(CPU_FTR_ARCH_207S)) 376 host_pcr_bit = PCR_ARCH_207; 377 else if (cpu_has_feature(CPU_FTR_ARCH_206)) 378 host_pcr_bit = PCR_ARCH_206; 379 else 380 host_pcr_bit = PCR_ARCH_205; 381 382 /* Determine lowest PCR bit needed to run guest in given PVR level */ 383 guest_pcr_bit = host_pcr_bit; 384 if (arch_compat) { 385 switch (arch_compat) { 386 case PVR_ARCH_205: 387 guest_pcr_bit = PCR_ARCH_205; 388 break; 389 case PVR_ARCH_206: 390 case PVR_ARCH_206p: 391 guest_pcr_bit = PCR_ARCH_206; 392 break; 393 case PVR_ARCH_207: 394 guest_pcr_bit = PCR_ARCH_207; 395 break; 396 case PVR_ARCH_300: 397 guest_pcr_bit = PCR_ARCH_300; 398 break; 399 case PVR_ARCH_31: 400 guest_pcr_bit = PCR_ARCH_31; 401 break; 402 default: 403 return -EINVAL; 404 } 405 } 406 407 /* Check requested PCR bits don't exceed our capabilities */ 408 if (guest_pcr_bit > host_pcr_bit) 409 return -EINVAL; 410 411 spin_lock(&vc->lock); 412 vc->arch_compat = arch_compat; 413 /* 414 * Set all PCR bits for which guest_pcr_bit <= bit < host_pcr_bit 415 * Also set all reserved PCR bits 416 */ 417 vc->pcr = (host_pcr_bit - guest_pcr_bit) | PCR_MASK; 418 spin_unlock(&vc->lock); 419 420 return 0; 421 } 422 423 static void kvmppc_dump_regs(struct kvm_vcpu *vcpu) 424 { 425 int r; 426 427 pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id); 428 pr_err("pc = %.16lx msr = %.16llx trap = %x\n", 429 vcpu->arch.regs.nip, vcpu->arch.shregs.msr, vcpu->arch.trap); 430 for (r = 0; r < 16; ++r) 431 pr_err("r%2d = %.16lx r%d = %.16lx\n", 432 r, kvmppc_get_gpr(vcpu, r), 433 r+16, kvmppc_get_gpr(vcpu, r+16)); 434 pr_err("ctr = %.16lx lr = %.16lx\n", 435 vcpu->arch.regs.ctr, vcpu->arch.regs.link); 436 pr_err("srr0 = %.16llx srr1 = %.16llx\n", 437 vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1); 438 pr_err("sprg0 = %.16llx sprg1 = %.16llx\n", 439 vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1); 440 pr_err("sprg2 = %.16llx sprg3 = %.16llx\n", 441 vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3); 442 pr_err("cr = %.8lx xer = %.16lx dsisr = %.8x\n", 443 vcpu->arch.regs.ccr, vcpu->arch.regs.xer, vcpu->arch.shregs.dsisr); 444 pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar); 445 pr_err("fault dar = %.16lx dsisr = %.8x\n", 446 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); 447 pr_err("SLB (%d entries):\n", vcpu->arch.slb_max); 448 for (r = 0; r < vcpu->arch.slb_max; ++r) 449 pr_err(" ESID = %.16llx VSID = %.16llx\n", 450 vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv); 451 pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n", 452 vcpu->arch.vcore->lpcr, vcpu->kvm->arch.sdr1, 453 vcpu->arch.last_inst); 454 } 455 456 static struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id) 457 { 458 return kvm_get_vcpu_by_id(kvm, id); 459 } 460 461 static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa) 462 { 463 vpa->__old_status |= LPPACA_OLD_SHARED_PROC; 464 vpa->yield_count = cpu_to_be32(1); 465 } 466 467 static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v, 468 unsigned long addr, unsigned long len) 469 { 470 /* check address is cacheline aligned */ 471 if (addr & (L1_CACHE_BYTES - 1)) 472 return -EINVAL; 473 spin_lock(&vcpu->arch.vpa_update_lock); 474 if (v->next_gpa != addr || v->len != len) { 475 v->next_gpa = addr; 476 v->len = addr ? len : 0; 477 v->update_pending = 1; 478 } 479 spin_unlock(&vcpu->arch.vpa_update_lock); 480 return 0; 481 } 482 483 /* Length for a per-processor buffer is passed in at offset 4 in the buffer */ 484 struct reg_vpa { 485 u32 dummy; 486 union { 487 __be16 hword; 488 __be32 word; 489 } length; 490 }; 491 492 static int vpa_is_registered(struct kvmppc_vpa *vpap) 493 { 494 if (vpap->update_pending) 495 return vpap->next_gpa != 0; 496 return vpap->pinned_addr != NULL; 497 } 498 499 static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu, 500 unsigned long flags, 501 unsigned long vcpuid, unsigned long vpa) 502 { 503 struct kvm *kvm = vcpu->kvm; 504 unsigned long len, nb; 505 void *va; 506 struct kvm_vcpu *tvcpu; 507 int err; 508 int subfunc; 509 struct kvmppc_vpa *vpap; 510 511 tvcpu = kvmppc_find_vcpu(kvm, vcpuid); 512 if (!tvcpu) 513 return H_PARAMETER; 514 515 subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK; 516 if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL || 517 subfunc == H_VPA_REG_SLB) { 518 /* Registering new area - address must be cache-line aligned */ 519 if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa) 520 return H_PARAMETER; 521 522 /* convert logical addr to kernel addr and read length */ 523 va = kvmppc_pin_guest_page(kvm, vpa, &nb); 524 if (va == NULL) 525 return H_PARAMETER; 526 if (subfunc == H_VPA_REG_VPA) 527 len = be16_to_cpu(((struct reg_vpa *)va)->length.hword); 528 else 529 len = be32_to_cpu(((struct reg_vpa *)va)->length.word); 530 kvmppc_unpin_guest_page(kvm, va, vpa, false); 531 532 /* Check length */ 533 if (len > nb || len < sizeof(struct reg_vpa)) 534 return H_PARAMETER; 535 } else { 536 vpa = 0; 537 len = 0; 538 } 539 540 err = H_PARAMETER; 541 vpap = NULL; 542 spin_lock(&tvcpu->arch.vpa_update_lock); 543 544 switch (subfunc) { 545 case H_VPA_REG_VPA: /* register VPA */ 546 /* 547 * The size of our lppaca is 1kB because of the way we align 548 * it for the guest to avoid crossing a 4kB boundary. We only 549 * use 640 bytes of the structure though, so we should accept 550 * clients that set a size of 640. 551 */ 552 BUILD_BUG_ON(sizeof(struct lppaca) != 640); 553 if (len < sizeof(struct lppaca)) 554 break; 555 vpap = &tvcpu->arch.vpa; 556 err = 0; 557 break; 558 559 case H_VPA_REG_DTL: /* register DTL */ 560 if (len < sizeof(struct dtl_entry)) 561 break; 562 len -= len % sizeof(struct dtl_entry); 563 564 /* Check that they have previously registered a VPA */ 565 err = H_RESOURCE; 566 if (!vpa_is_registered(&tvcpu->arch.vpa)) 567 break; 568 569 vpap = &tvcpu->arch.dtl; 570 err = 0; 571 break; 572 573 case H_VPA_REG_SLB: /* register SLB shadow buffer */ 574 /* Check that they have previously registered a VPA */ 575 err = H_RESOURCE; 576 if (!vpa_is_registered(&tvcpu->arch.vpa)) 577 break; 578 579 vpap = &tvcpu->arch.slb_shadow; 580 err = 0; 581 break; 582 583 case H_VPA_DEREG_VPA: /* deregister VPA */ 584 /* Check they don't still have a DTL or SLB buf registered */ 585 err = H_RESOURCE; 586 if (vpa_is_registered(&tvcpu->arch.dtl) || 587 vpa_is_registered(&tvcpu->arch.slb_shadow)) 588 break; 589 590 vpap = &tvcpu->arch.vpa; 591 err = 0; 592 break; 593 594 case H_VPA_DEREG_DTL: /* deregister DTL */ 595 vpap = &tvcpu->arch.dtl; 596 err = 0; 597 break; 598 599 case H_VPA_DEREG_SLB: /* deregister SLB shadow buffer */ 600 vpap = &tvcpu->arch.slb_shadow; 601 err = 0; 602 break; 603 } 604 605 if (vpap) { 606 vpap->next_gpa = vpa; 607 vpap->len = len; 608 vpap->update_pending = 1; 609 } 610 611 spin_unlock(&tvcpu->arch.vpa_update_lock); 612 613 return err; 614 } 615 616 static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap) 617 { 618 struct kvm *kvm = vcpu->kvm; 619 void *va; 620 unsigned long nb; 621 unsigned long gpa; 622 623 /* 624 * We need to pin the page pointed to by vpap->next_gpa, 625 * but we can't call kvmppc_pin_guest_page under the lock 626 * as it does get_user_pages() and down_read(). So we 627 * have to drop the lock, pin the page, then get the lock 628 * again and check that a new area didn't get registered 629 * in the meantime. 630 */ 631 for (;;) { 632 gpa = vpap->next_gpa; 633 spin_unlock(&vcpu->arch.vpa_update_lock); 634 va = NULL; 635 nb = 0; 636 if (gpa) 637 va = kvmppc_pin_guest_page(kvm, gpa, &nb); 638 spin_lock(&vcpu->arch.vpa_update_lock); 639 if (gpa == vpap->next_gpa) 640 break; 641 /* sigh... unpin that one and try again */ 642 if (va) 643 kvmppc_unpin_guest_page(kvm, va, gpa, false); 644 } 645 646 vpap->update_pending = 0; 647 if (va && nb < vpap->len) { 648 /* 649 * If it's now too short, it must be that userspace 650 * has changed the mappings underlying guest memory, 651 * so unregister the region. 652 */ 653 kvmppc_unpin_guest_page(kvm, va, gpa, false); 654 va = NULL; 655 } 656 if (vpap->pinned_addr) 657 kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa, 658 vpap->dirty); 659 vpap->gpa = gpa; 660 vpap->pinned_addr = va; 661 vpap->dirty = false; 662 if (va) 663 vpap->pinned_end = va + vpap->len; 664 } 665 666 static void kvmppc_update_vpas(struct kvm_vcpu *vcpu) 667 { 668 if (!(vcpu->arch.vpa.update_pending || 669 vcpu->arch.slb_shadow.update_pending || 670 vcpu->arch.dtl.update_pending)) 671 return; 672 673 spin_lock(&vcpu->arch.vpa_update_lock); 674 if (vcpu->arch.vpa.update_pending) { 675 kvmppc_update_vpa(vcpu, &vcpu->arch.vpa); 676 if (vcpu->arch.vpa.pinned_addr) 677 init_vpa(vcpu, vcpu->arch.vpa.pinned_addr); 678 } 679 if (vcpu->arch.dtl.update_pending) { 680 kvmppc_update_vpa(vcpu, &vcpu->arch.dtl); 681 vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr; 682 vcpu->arch.dtl_index = 0; 683 } 684 if (vcpu->arch.slb_shadow.update_pending) 685 kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow); 686 spin_unlock(&vcpu->arch.vpa_update_lock); 687 } 688 689 /* 690 * Return the accumulated stolen time for the vcore up until `now'. 691 * The caller should hold the vcore lock. 692 */ 693 static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now) 694 { 695 u64 p; 696 unsigned long flags; 697 698 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); 699 700 spin_lock_irqsave(&vc->stoltb_lock, flags); 701 p = vc->stolen_tb; 702 if (vc->vcore_state != VCORE_INACTIVE && 703 vc->preempt_tb != TB_NIL) 704 p += now - vc->preempt_tb; 705 spin_unlock_irqrestore(&vc->stoltb_lock, flags); 706 return p; 707 } 708 709 static void __kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu, 710 unsigned int pcpu, u64 now, 711 unsigned long stolen) 712 { 713 struct dtl_entry *dt; 714 struct lppaca *vpa; 715 716 dt = vcpu->arch.dtl_ptr; 717 vpa = vcpu->arch.vpa.pinned_addr; 718 719 if (!dt || !vpa) 720 return; 721 722 dt->dispatch_reason = 7; 723 dt->preempt_reason = 0; 724 dt->processor_id = cpu_to_be16(pcpu + vcpu->arch.ptid); 725 dt->enqueue_to_dispatch_time = cpu_to_be32(stolen); 726 dt->ready_to_enqueue_time = 0; 727 dt->waiting_to_ready_time = 0; 728 dt->timebase = cpu_to_be64(now); 729 dt->fault_addr = 0; 730 dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu)); 731 dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr); 732 733 ++dt; 734 if (dt == vcpu->arch.dtl.pinned_end) 735 dt = vcpu->arch.dtl.pinned_addr; 736 vcpu->arch.dtl_ptr = dt; 737 /* order writing *dt vs. writing vpa->dtl_idx */ 738 smp_wmb(); 739 vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index); 740 vcpu->arch.dtl.dirty = true; 741 } 742 743 static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu, 744 struct kvmppc_vcore *vc) 745 { 746 unsigned long stolen; 747 unsigned long core_stolen; 748 u64 now; 749 unsigned long flags; 750 751 now = mftb(); 752 753 core_stolen = vcore_stolen_time(vc, now); 754 stolen = core_stolen - vcpu->arch.stolen_logged; 755 vcpu->arch.stolen_logged = core_stolen; 756 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); 757 stolen += vcpu->arch.busy_stolen; 758 vcpu->arch.busy_stolen = 0; 759 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); 760 761 __kvmppc_create_dtl_entry(vcpu, vc->pcpu, now + vc->tb_offset, stolen); 762 } 763 764 /* See if there is a doorbell interrupt pending for a vcpu */ 765 static bool kvmppc_doorbell_pending(struct kvm_vcpu *vcpu) 766 { 767 int thr; 768 struct kvmppc_vcore *vc; 769 770 if (vcpu->arch.doorbell_request) 771 return true; 772 if (cpu_has_feature(CPU_FTR_ARCH_300)) 773 return false; 774 /* 775 * Ensure that the read of vcore->dpdes comes after the read 776 * of vcpu->doorbell_request. This barrier matches the 777 * smp_wmb() in kvmppc_guest_entry_inject(). 778 */ 779 smp_rmb(); 780 vc = vcpu->arch.vcore; 781 thr = vcpu->vcpu_id - vc->first_vcpuid; 782 return !!(vc->dpdes & (1 << thr)); 783 } 784 785 static bool kvmppc_power8_compatible(struct kvm_vcpu *vcpu) 786 { 787 if (vcpu->arch.vcore->arch_compat >= PVR_ARCH_207) 788 return true; 789 if ((!vcpu->arch.vcore->arch_compat) && 790 cpu_has_feature(CPU_FTR_ARCH_207S)) 791 return true; 792 return false; 793 } 794 795 static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags, 796 unsigned long resource, unsigned long value1, 797 unsigned long value2) 798 { 799 switch (resource) { 800 case H_SET_MODE_RESOURCE_SET_CIABR: 801 if (!kvmppc_power8_compatible(vcpu)) 802 return H_P2; 803 if (value2) 804 return H_P4; 805 if (mflags) 806 return H_UNSUPPORTED_FLAG_START; 807 /* Guests can't breakpoint the hypervisor */ 808 if ((value1 & CIABR_PRIV) == CIABR_PRIV_HYPER) 809 return H_P3; 810 vcpu->arch.ciabr = value1; 811 return H_SUCCESS; 812 case H_SET_MODE_RESOURCE_SET_DAWR0: 813 if (!kvmppc_power8_compatible(vcpu)) 814 return H_P2; 815 if (!ppc_breakpoint_available()) 816 return H_P2; 817 if (mflags) 818 return H_UNSUPPORTED_FLAG_START; 819 if (value2 & DABRX_HYP) 820 return H_P4; 821 vcpu->arch.dawr0 = value1; 822 vcpu->arch.dawrx0 = value2; 823 return H_SUCCESS; 824 case H_SET_MODE_RESOURCE_SET_DAWR1: 825 if (!kvmppc_power8_compatible(vcpu)) 826 return H_P2; 827 if (!ppc_breakpoint_available()) 828 return H_P2; 829 if (!cpu_has_feature(CPU_FTR_DAWR1)) 830 return H_P2; 831 if (!vcpu->kvm->arch.dawr1_enabled) 832 return H_FUNCTION; 833 if (mflags) 834 return H_UNSUPPORTED_FLAG_START; 835 if (value2 & DABRX_HYP) 836 return H_P4; 837 vcpu->arch.dawr1 = value1; 838 vcpu->arch.dawrx1 = value2; 839 return H_SUCCESS; 840 case H_SET_MODE_RESOURCE_ADDR_TRANS_MODE: 841 /* 842 * KVM does not support mflags=2 (AIL=2) and AIL=1 is reserved. 843 * Keep this in synch with kvmppc_filter_guest_lpcr_hv. 844 */ 845 if (cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG) && 846 kvmhv_vcpu_is_radix(vcpu) && mflags == 3) 847 return H_UNSUPPORTED_FLAG_START; 848 return H_TOO_HARD; 849 default: 850 return H_TOO_HARD; 851 } 852 } 853 854 /* Copy guest memory in place - must reside within a single memslot */ 855 static int kvmppc_copy_guest(struct kvm *kvm, gpa_t to, gpa_t from, 856 unsigned long len) 857 { 858 struct kvm_memory_slot *to_memslot = NULL; 859 struct kvm_memory_slot *from_memslot = NULL; 860 unsigned long to_addr, from_addr; 861 int r; 862 863 /* Get HPA for from address */ 864 from_memslot = gfn_to_memslot(kvm, from >> PAGE_SHIFT); 865 if (!from_memslot) 866 return -EFAULT; 867 if ((from + len) >= ((from_memslot->base_gfn + from_memslot->npages) 868 << PAGE_SHIFT)) 869 return -EINVAL; 870 from_addr = gfn_to_hva_memslot(from_memslot, from >> PAGE_SHIFT); 871 if (kvm_is_error_hva(from_addr)) 872 return -EFAULT; 873 from_addr |= (from & (PAGE_SIZE - 1)); 874 875 /* Get HPA for to address */ 876 to_memslot = gfn_to_memslot(kvm, to >> PAGE_SHIFT); 877 if (!to_memslot) 878 return -EFAULT; 879 if ((to + len) >= ((to_memslot->base_gfn + to_memslot->npages) 880 << PAGE_SHIFT)) 881 return -EINVAL; 882 to_addr = gfn_to_hva_memslot(to_memslot, to >> PAGE_SHIFT); 883 if (kvm_is_error_hva(to_addr)) 884 return -EFAULT; 885 to_addr |= (to & (PAGE_SIZE - 1)); 886 887 /* Perform copy */ 888 r = raw_copy_in_user((void __user *)to_addr, (void __user *)from_addr, 889 len); 890 if (r) 891 return -EFAULT; 892 mark_page_dirty(kvm, to >> PAGE_SHIFT); 893 return 0; 894 } 895 896 static long kvmppc_h_page_init(struct kvm_vcpu *vcpu, unsigned long flags, 897 unsigned long dest, unsigned long src) 898 { 899 u64 pg_sz = SZ_4K; /* 4K page size */ 900 u64 pg_mask = SZ_4K - 1; 901 int ret; 902 903 /* Check for invalid flags (H_PAGE_SET_LOANED covers all CMO flags) */ 904 if (flags & ~(H_ICACHE_INVALIDATE | H_ICACHE_SYNCHRONIZE | 905 H_ZERO_PAGE | H_COPY_PAGE | H_PAGE_SET_LOANED)) 906 return H_PARAMETER; 907 908 /* dest (and src if copy_page flag set) must be page aligned */ 909 if ((dest & pg_mask) || ((flags & H_COPY_PAGE) && (src & pg_mask))) 910 return H_PARAMETER; 911 912 /* zero and/or copy the page as determined by the flags */ 913 if (flags & H_COPY_PAGE) { 914 ret = kvmppc_copy_guest(vcpu->kvm, dest, src, pg_sz); 915 if (ret < 0) 916 return H_PARAMETER; 917 } else if (flags & H_ZERO_PAGE) { 918 ret = kvm_clear_guest(vcpu->kvm, dest, pg_sz); 919 if (ret < 0) 920 return H_PARAMETER; 921 } 922 923 /* We can ignore the remaining flags */ 924 925 return H_SUCCESS; 926 } 927 928 static int kvm_arch_vcpu_yield_to(struct kvm_vcpu *target) 929 { 930 struct kvmppc_vcore *vcore = target->arch.vcore; 931 932 /* 933 * We expect to have been called by the real mode handler 934 * (kvmppc_rm_h_confer()) which would have directly returned 935 * H_SUCCESS if the source vcore wasn't idle (e.g. if it may 936 * have useful work to do and should not confer) so we don't 937 * recheck that here. 938 * 939 * In the case of the P9 single vcpu per vcore case, the real 940 * mode handler is not called but no other threads are in the 941 * source vcore. 942 */ 943 if (!cpu_has_feature(CPU_FTR_ARCH_300)) { 944 spin_lock(&vcore->lock); 945 if (target->arch.state == KVMPPC_VCPU_RUNNABLE && 946 vcore->vcore_state != VCORE_INACTIVE && 947 vcore->runner) 948 target = vcore->runner; 949 spin_unlock(&vcore->lock); 950 } 951 952 return kvm_vcpu_yield_to(target); 953 } 954 955 static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu) 956 { 957 int yield_count = 0; 958 struct lppaca *lppaca; 959 960 spin_lock(&vcpu->arch.vpa_update_lock); 961 lppaca = (struct lppaca *)vcpu->arch.vpa.pinned_addr; 962 if (lppaca) 963 yield_count = be32_to_cpu(lppaca->yield_count); 964 spin_unlock(&vcpu->arch.vpa_update_lock); 965 return yield_count; 966 } 967 968 /* 969 * H_RPT_INVALIDATE hcall handler for nested guests. 970 * 971 * Handles only nested process-scoped invalidation requests in L0. 972 */ 973 static int kvmppc_nested_h_rpt_invalidate(struct kvm_vcpu *vcpu) 974 { 975 unsigned long type = kvmppc_get_gpr(vcpu, 6); 976 unsigned long pid, pg_sizes, start, end; 977 978 /* 979 * The partition-scoped invalidations aren't handled here in L0. 980 */ 981 if (type & H_RPTI_TYPE_NESTED) 982 return RESUME_HOST; 983 984 pid = kvmppc_get_gpr(vcpu, 4); 985 pg_sizes = kvmppc_get_gpr(vcpu, 7); 986 start = kvmppc_get_gpr(vcpu, 8); 987 end = kvmppc_get_gpr(vcpu, 9); 988 989 do_h_rpt_invalidate_prt(pid, vcpu->arch.nested->shadow_lpid, 990 type, pg_sizes, start, end); 991 992 kvmppc_set_gpr(vcpu, 3, H_SUCCESS); 993 return RESUME_GUEST; 994 } 995 996 static long kvmppc_h_rpt_invalidate(struct kvm_vcpu *vcpu, 997 unsigned long id, unsigned long target, 998 unsigned long type, unsigned long pg_sizes, 999 unsigned long start, unsigned long end) 1000 { 1001 if (!kvm_is_radix(vcpu->kvm)) 1002 return H_UNSUPPORTED; 1003 1004 if (end < start) 1005 return H_P5; 1006 1007 /* 1008 * Partition-scoped invalidation for nested guests. 1009 */ 1010 if (type & H_RPTI_TYPE_NESTED) { 1011 if (!nesting_enabled(vcpu->kvm)) 1012 return H_FUNCTION; 1013 1014 /* Support only cores as target */ 1015 if (target != H_RPTI_TARGET_CMMU) 1016 return H_P2; 1017 1018 return do_h_rpt_invalidate_pat(vcpu, id, type, pg_sizes, 1019 start, end); 1020 } 1021 1022 /* 1023 * Process-scoped invalidation for L1 guests. 1024 */ 1025 do_h_rpt_invalidate_prt(id, vcpu->kvm->arch.lpid, 1026 type, pg_sizes, start, end); 1027 return H_SUCCESS; 1028 } 1029 1030 int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu) 1031 { 1032 struct kvm *kvm = vcpu->kvm; 1033 unsigned long req = kvmppc_get_gpr(vcpu, 3); 1034 unsigned long target, ret = H_SUCCESS; 1035 int yield_count; 1036 struct kvm_vcpu *tvcpu; 1037 int idx, rc; 1038 1039 if (req <= MAX_HCALL_OPCODE && 1040 !test_bit(req/4, vcpu->kvm->arch.enabled_hcalls)) 1041 return RESUME_HOST; 1042 1043 switch (req) { 1044 case H_REMOVE: 1045 ret = kvmppc_h_remove(vcpu, kvmppc_get_gpr(vcpu, 4), 1046 kvmppc_get_gpr(vcpu, 5), 1047 kvmppc_get_gpr(vcpu, 6)); 1048 if (ret == H_TOO_HARD) 1049 return RESUME_HOST; 1050 break; 1051 case H_ENTER: 1052 ret = kvmppc_h_enter(vcpu, kvmppc_get_gpr(vcpu, 4), 1053 kvmppc_get_gpr(vcpu, 5), 1054 kvmppc_get_gpr(vcpu, 6), 1055 kvmppc_get_gpr(vcpu, 7)); 1056 if (ret == H_TOO_HARD) 1057 return RESUME_HOST; 1058 break; 1059 case H_READ: 1060 ret = kvmppc_h_read(vcpu, kvmppc_get_gpr(vcpu, 4), 1061 kvmppc_get_gpr(vcpu, 5)); 1062 if (ret == H_TOO_HARD) 1063 return RESUME_HOST; 1064 break; 1065 case H_CLEAR_MOD: 1066 ret = kvmppc_h_clear_mod(vcpu, kvmppc_get_gpr(vcpu, 4), 1067 kvmppc_get_gpr(vcpu, 5)); 1068 if (ret == H_TOO_HARD) 1069 return RESUME_HOST; 1070 break; 1071 case H_CLEAR_REF: 1072 ret = kvmppc_h_clear_ref(vcpu, kvmppc_get_gpr(vcpu, 4), 1073 kvmppc_get_gpr(vcpu, 5)); 1074 if (ret == H_TOO_HARD) 1075 return RESUME_HOST; 1076 break; 1077 case H_PROTECT: 1078 ret = kvmppc_h_protect(vcpu, kvmppc_get_gpr(vcpu, 4), 1079 kvmppc_get_gpr(vcpu, 5), 1080 kvmppc_get_gpr(vcpu, 6)); 1081 if (ret == H_TOO_HARD) 1082 return RESUME_HOST; 1083 break; 1084 case H_BULK_REMOVE: 1085 ret = kvmppc_h_bulk_remove(vcpu); 1086 if (ret == H_TOO_HARD) 1087 return RESUME_HOST; 1088 break; 1089 1090 case H_CEDE: 1091 break; 1092 case H_PROD: 1093 target = kvmppc_get_gpr(vcpu, 4); 1094 tvcpu = kvmppc_find_vcpu(kvm, target); 1095 if (!tvcpu) { 1096 ret = H_PARAMETER; 1097 break; 1098 } 1099 tvcpu->arch.prodded = 1; 1100 smp_mb(); /* This orders prodded store vs ceded load */ 1101 if (tvcpu->arch.ceded) 1102 kvmppc_fast_vcpu_kick_hv(tvcpu); 1103 break; 1104 case H_CONFER: 1105 target = kvmppc_get_gpr(vcpu, 4); 1106 if (target == -1) 1107 break; 1108 tvcpu = kvmppc_find_vcpu(kvm, target); 1109 if (!tvcpu) { 1110 ret = H_PARAMETER; 1111 break; 1112 } 1113 yield_count = kvmppc_get_gpr(vcpu, 5); 1114 if (kvmppc_get_yield_count(tvcpu) != yield_count) 1115 break; 1116 kvm_arch_vcpu_yield_to(tvcpu); 1117 break; 1118 case H_REGISTER_VPA: 1119 ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4), 1120 kvmppc_get_gpr(vcpu, 5), 1121 kvmppc_get_gpr(vcpu, 6)); 1122 break; 1123 case H_RTAS: 1124 if (list_empty(&kvm->arch.rtas_tokens)) 1125 return RESUME_HOST; 1126 1127 idx = srcu_read_lock(&kvm->srcu); 1128 rc = kvmppc_rtas_hcall(vcpu); 1129 srcu_read_unlock(&kvm->srcu, idx); 1130 1131 if (rc == -ENOENT) 1132 return RESUME_HOST; 1133 else if (rc == 0) 1134 break; 1135 1136 /* Send the error out to userspace via KVM_RUN */ 1137 return rc; 1138 case H_LOGICAL_CI_LOAD: 1139 ret = kvmppc_h_logical_ci_load(vcpu); 1140 if (ret == H_TOO_HARD) 1141 return RESUME_HOST; 1142 break; 1143 case H_LOGICAL_CI_STORE: 1144 ret = kvmppc_h_logical_ci_store(vcpu); 1145 if (ret == H_TOO_HARD) 1146 return RESUME_HOST; 1147 break; 1148 case H_SET_MODE: 1149 ret = kvmppc_h_set_mode(vcpu, kvmppc_get_gpr(vcpu, 4), 1150 kvmppc_get_gpr(vcpu, 5), 1151 kvmppc_get_gpr(vcpu, 6), 1152 kvmppc_get_gpr(vcpu, 7)); 1153 if (ret == H_TOO_HARD) 1154 return RESUME_HOST; 1155 break; 1156 case H_XIRR: 1157 case H_CPPR: 1158 case H_EOI: 1159 case H_IPI: 1160 case H_IPOLL: 1161 case H_XIRR_X: 1162 if (kvmppc_xics_enabled(vcpu)) { 1163 if (xics_on_xive()) { 1164 ret = H_NOT_AVAILABLE; 1165 return RESUME_GUEST; 1166 } 1167 ret = kvmppc_xics_hcall(vcpu, req); 1168 break; 1169 } 1170 return RESUME_HOST; 1171 case H_SET_DABR: 1172 ret = kvmppc_h_set_dabr(vcpu, kvmppc_get_gpr(vcpu, 4)); 1173 break; 1174 case H_SET_XDABR: 1175 ret = kvmppc_h_set_xdabr(vcpu, kvmppc_get_gpr(vcpu, 4), 1176 kvmppc_get_gpr(vcpu, 5)); 1177 break; 1178 #ifdef CONFIG_SPAPR_TCE_IOMMU 1179 case H_GET_TCE: 1180 ret = kvmppc_h_get_tce(vcpu, kvmppc_get_gpr(vcpu, 4), 1181 kvmppc_get_gpr(vcpu, 5)); 1182 if (ret == H_TOO_HARD) 1183 return RESUME_HOST; 1184 break; 1185 case H_PUT_TCE: 1186 ret = kvmppc_h_put_tce(vcpu, kvmppc_get_gpr(vcpu, 4), 1187 kvmppc_get_gpr(vcpu, 5), 1188 kvmppc_get_gpr(vcpu, 6)); 1189 if (ret == H_TOO_HARD) 1190 return RESUME_HOST; 1191 break; 1192 case H_PUT_TCE_INDIRECT: 1193 ret = kvmppc_h_put_tce_indirect(vcpu, kvmppc_get_gpr(vcpu, 4), 1194 kvmppc_get_gpr(vcpu, 5), 1195 kvmppc_get_gpr(vcpu, 6), 1196 kvmppc_get_gpr(vcpu, 7)); 1197 if (ret == H_TOO_HARD) 1198 return RESUME_HOST; 1199 break; 1200 case H_STUFF_TCE: 1201 ret = kvmppc_h_stuff_tce(vcpu, kvmppc_get_gpr(vcpu, 4), 1202 kvmppc_get_gpr(vcpu, 5), 1203 kvmppc_get_gpr(vcpu, 6), 1204 kvmppc_get_gpr(vcpu, 7)); 1205 if (ret == H_TOO_HARD) 1206 return RESUME_HOST; 1207 break; 1208 #endif 1209 case H_RANDOM: 1210 if (!arch_get_random_seed_long(&vcpu->arch.regs.gpr[4])) 1211 ret = H_HARDWARE; 1212 break; 1213 case H_RPT_INVALIDATE: 1214 ret = kvmppc_h_rpt_invalidate(vcpu, kvmppc_get_gpr(vcpu, 4), 1215 kvmppc_get_gpr(vcpu, 5), 1216 kvmppc_get_gpr(vcpu, 6), 1217 kvmppc_get_gpr(vcpu, 7), 1218 kvmppc_get_gpr(vcpu, 8), 1219 kvmppc_get_gpr(vcpu, 9)); 1220 break; 1221 1222 case H_SET_PARTITION_TABLE: 1223 ret = H_FUNCTION; 1224 if (nesting_enabled(kvm)) 1225 ret = kvmhv_set_partition_table(vcpu); 1226 break; 1227 case H_ENTER_NESTED: 1228 ret = H_FUNCTION; 1229 if (!nesting_enabled(kvm)) 1230 break; 1231 ret = kvmhv_enter_nested_guest(vcpu); 1232 if (ret == H_INTERRUPT) { 1233 kvmppc_set_gpr(vcpu, 3, 0); 1234 vcpu->arch.hcall_needed = 0; 1235 return -EINTR; 1236 } else if (ret == H_TOO_HARD) { 1237 kvmppc_set_gpr(vcpu, 3, 0); 1238 vcpu->arch.hcall_needed = 0; 1239 return RESUME_HOST; 1240 } 1241 break; 1242 case H_TLB_INVALIDATE: 1243 ret = H_FUNCTION; 1244 if (nesting_enabled(kvm)) 1245 ret = kvmhv_do_nested_tlbie(vcpu); 1246 break; 1247 case H_COPY_TOFROM_GUEST: 1248 ret = H_FUNCTION; 1249 if (nesting_enabled(kvm)) 1250 ret = kvmhv_copy_tofrom_guest_nested(vcpu); 1251 break; 1252 case H_PAGE_INIT: 1253 ret = kvmppc_h_page_init(vcpu, kvmppc_get_gpr(vcpu, 4), 1254 kvmppc_get_gpr(vcpu, 5), 1255 kvmppc_get_gpr(vcpu, 6)); 1256 break; 1257 case H_SVM_PAGE_IN: 1258 ret = H_UNSUPPORTED; 1259 if (kvmppc_get_srr1(vcpu) & MSR_S) 1260 ret = kvmppc_h_svm_page_in(kvm, 1261 kvmppc_get_gpr(vcpu, 4), 1262 kvmppc_get_gpr(vcpu, 5), 1263 kvmppc_get_gpr(vcpu, 6)); 1264 break; 1265 case H_SVM_PAGE_OUT: 1266 ret = H_UNSUPPORTED; 1267 if (kvmppc_get_srr1(vcpu) & MSR_S) 1268 ret = kvmppc_h_svm_page_out(kvm, 1269 kvmppc_get_gpr(vcpu, 4), 1270 kvmppc_get_gpr(vcpu, 5), 1271 kvmppc_get_gpr(vcpu, 6)); 1272 break; 1273 case H_SVM_INIT_START: 1274 ret = H_UNSUPPORTED; 1275 if (kvmppc_get_srr1(vcpu) & MSR_S) 1276 ret = kvmppc_h_svm_init_start(kvm); 1277 break; 1278 case H_SVM_INIT_DONE: 1279 ret = H_UNSUPPORTED; 1280 if (kvmppc_get_srr1(vcpu) & MSR_S) 1281 ret = kvmppc_h_svm_init_done(kvm); 1282 break; 1283 case H_SVM_INIT_ABORT: 1284 /* 1285 * Even if that call is made by the Ultravisor, the SSR1 value 1286 * is the guest context one, with the secure bit clear as it has 1287 * not yet been secured. So we can't check it here. 1288 * Instead the kvm->arch.secure_guest flag is checked inside 1289 * kvmppc_h_svm_init_abort(). 1290 */ 1291 ret = kvmppc_h_svm_init_abort(kvm); 1292 break; 1293 1294 default: 1295 return RESUME_HOST; 1296 } 1297 WARN_ON_ONCE(ret == H_TOO_HARD); 1298 kvmppc_set_gpr(vcpu, 3, ret); 1299 vcpu->arch.hcall_needed = 0; 1300 return RESUME_GUEST; 1301 } 1302 1303 /* 1304 * Handle H_CEDE in the P9 path where we don't call the real-mode hcall 1305 * handlers in book3s_hv_rmhandlers.S. 1306 * 1307 * This has to be done early, not in kvmppc_pseries_do_hcall(), so 1308 * that the cede logic in kvmppc_run_single_vcpu() works properly. 1309 */ 1310 static void kvmppc_cede(struct kvm_vcpu *vcpu) 1311 { 1312 vcpu->arch.shregs.msr |= MSR_EE; 1313 vcpu->arch.ceded = 1; 1314 smp_mb(); 1315 if (vcpu->arch.prodded) { 1316 vcpu->arch.prodded = 0; 1317 smp_mb(); 1318 vcpu->arch.ceded = 0; 1319 } 1320 } 1321 1322 static int kvmppc_hcall_impl_hv(unsigned long cmd) 1323 { 1324 switch (cmd) { 1325 case H_CEDE: 1326 case H_PROD: 1327 case H_CONFER: 1328 case H_REGISTER_VPA: 1329 case H_SET_MODE: 1330 #ifdef CONFIG_SPAPR_TCE_IOMMU 1331 case H_GET_TCE: 1332 case H_PUT_TCE: 1333 case H_PUT_TCE_INDIRECT: 1334 case H_STUFF_TCE: 1335 #endif 1336 case H_LOGICAL_CI_LOAD: 1337 case H_LOGICAL_CI_STORE: 1338 #ifdef CONFIG_KVM_XICS 1339 case H_XIRR: 1340 case H_CPPR: 1341 case H_EOI: 1342 case H_IPI: 1343 case H_IPOLL: 1344 case H_XIRR_X: 1345 #endif 1346 case H_PAGE_INIT: 1347 case H_RPT_INVALIDATE: 1348 return 1; 1349 } 1350 1351 /* See if it's in the real-mode table */ 1352 return kvmppc_hcall_impl_hv_realmode(cmd); 1353 } 1354 1355 static int kvmppc_emulate_debug_inst(struct kvm_vcpu *vcpu) 1356 { 1357 u32 last_inst; 1358 1359 if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) != 1360 EMULATE_DONE) { 1361 /* 1362 * Fetch failed, so return to guest and 1363 * try executing it again. 1364 */ 1365 return RESUME_GUEST; 1366 } 1367 1368 if (last_inst == KVMPPC_INST_SW_BREAKPOINT) { 1369 vcpu->run->exit_reason = KVM_EXIT_DEBUG; 1370 vcpu->run->debug.arch.address = kvmppc_get_pc(vcpu); 1371 return RESUME_HOST; 1372 } else { 1373 kvmppc_core_queue_program(vcpu, SRR1_PROGILL); 1374 return RESUME_GUEST; 1375 } 1376 } 1377 1378 static void do_nothing(void *x) 1379 { 1380 } 1381 1382 static unsigned long kvmppc_read_dpdes(struct kvm_vcpu *vcpu) 1383 { 1384 int thr, cpu, pcpu, nthreads; 1385 struct kvm_vcpu *v; 1386 unsigned long dpdes; 1387 1388 nthreads = vcpu->kvm->arch.emul_smt_mode; 1389 dpdes = 0; 1390 cpu = vcpu->vcpu_id & ~(nthreads - 1); 1391 for (thr = 0; thr < nthreads; ++thr, ++cpu) { 1392 v = kvmppc_find_vcpu(vcpu->kvm, cpu); 1393 if (!v) 1394 continue; 1395 /* 1396 * If the vcpu is currently running on a physical cpu thread, 1397 * interrupt it in order to pull it out of the guest briefly, 1398 * which will update its vcore->dpdes value. 1399 */ 1400 pcpu = READ_ONCE(v->cpu); 1401 if (pcpu >= 0) 1402 smp_call_function_single(pcpu, do_nothing, NULL, 1); 1403 if (kvmppc_doorbell_pending(v)) 1404 dpdes |= 1 << thr; 1405 } 1406 return dpdes; 1407 } 1408 1409 /* 1410 * On POWER9, emulate doorbell-related instructions in order to 1411 * give the guest the illusion of running on a multi-threaded core. 1412 * The instructions emulated are msgsndp, msgclrp, mfspr TIR, 1413 * and mfspr DPDES. 1414 */ 1415 static int kvmppc_emulate_doorbell_instr(struct kvm_vcpu *vcpu) 1416 { 1417 u32 inst, rb, thr; 1418 unsigned long arg; 1419 struct kvm *kvm = vcpu->kvm; 1420 struct kvm_vcpu *tvcpu; 1421 1422 if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &inst) != EMULATE_DONE) 1423 return RESUME_GUEST; 1424 if (get_op(inst) != 31) 1425 return EMULATE_FAIL; 1426 rb = get_rb(inst); 1427 thr = vcpu->vcpu_id & (kvm->arch.emul_smt_mode - 1); 1428 switch (get_xop(inst)) { 1429 case OP_31_XOP_MSGSNDP: 1430 arg = kvmppc_get_gpr(vcpu, rb); 1431 if (((arg >> 27) & 0x1f) != PPC_DBELL_SERVER) 1432 break; 1433 arg &= 0x7f; 1434 if (arg >= kvm->arch.emul_smt_mode) 1435 break; 1436 tvcpu = kvmppc_find_vcpu(kvm, vcpu->vcpu_id - thr + arg); 1437 if (!tvcpu) 1438 break; 1439 if (!tvcpu->arch.doorbell_request) { 1440 tvcpu->arch.doorbell_request = 1; 1441 kvmppc_fast_vcpu_kick_hv(tvcpu); 1442 } 1443 break; 1444 case OP_31_XOP_MSGCLRP: 1445 arg = kvmppc_get_gpr(vcpu, rb); 1446 if (((arg >> 27) & 0x1f) != PPC_DBELL_SERVER) 1447 break; 1448 vcpu->arch.vcore->dpdes = 0; 1449 vcpu->arch.doorbell_request = 0; 1450 break; 1451 case OP_31_XOP_MFSPR: 1452 switch (get_sprn(inst)) { 1453 case SPRN_TIR: 1454 arg = thr; 1455 break; 1456 case SPRN_DPDES: 1457 arg = kvmppc_read_dpdes(vcpu); 1458 break; 1459 default: 1460 return EMULATE_FAIL; 1461 } 1462 kvmppc_set_gpr(vcpu, get_rt(inst), arg); 1463 break; 1464 default: 1465 return EMULATE_FAIL; 1466 } 1467 kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4); 1468 return RESUME_GUEST; 1469 } 1470 1471 /* 1472 * If the lppaca had pmcregs_in_use clear when we exited the guest, then 1473 * HFSCR_PM is cleared for next entry. If the guest then tries to access 1474 * the PMU SPRs, we get this facility unavailable interrupt. Putting HFSCR_PM 1475 * back in the guest HFSCR will cause the next entry to load the PMU SPRs and 1476 * allow the guest access to continue. 1477 */ 1478 static int kvmppc_pmu_unavailable(struct kvm_vcpu *vcpu) 1479 { 1480 if (!(vcpu->arch.hfscr_permitted & HFSCR_PM)) 1481 return EMULATE_FAIL; 1482 1483 vcpu->arch.hfscr |= HFSCR_PM; 1484 1485 return RESUME_GUEST; 1486 } 1487 1488 static int kvmppc_ebb_unavailable(struct kvm_vcpu *vcpu) 1489 { 1490 if (!(vcpu->arch.hfscr_permitted & HFSCR_EBB)) 1491 return EMULATE_FAIL; 1492 1493 vcpu->arch.hfscr |= HFSCR_EBB; 1494 1495 return RESUME_GUEST; 1496 } 1497 1498 static int kvmppc_tm_unavailable(struct kvm_vcpu *vcpu) 1499 { 1500 if (!(vcpu->arch.hfscr_permitted & HFSCR_TM)) 1501 return EMULATE_FAIL; 1502 1503 vcpu->arch.hfscr |= HFSCR_TM; 1504 1505 return RESUME_GUEST; 1506 } 1507 1508 static int kvmppc_handle_exit_hv(struct kvm_vcpu *vcpu, 1509 struct task_struct *tsk) 1510 { 1511 struct kvm_run *run = vcpu->run; 1512 int r = RESUME_HOST; 1513 1514 vcpu->stat.sum_exits++; 1515 1516 /* 1517 * This can happen if an interrupt occurs in the last stages 1518 * of guest entry or the first stages of guest exit (i.e. after 1519 * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV 1520 * and before setting it to KVM_GUEST_MODE_HOST_HV). 1521 * That can happen due to a bug, or due to a machine check 1522 * occurring at just the wrong time. 1523 */ 1524 if (vcpu->arch.shregs.msr & MSR_HV) { 1525 printk(KERN_EMERG "KVM trap in HV mode!\n"); 1526 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n", 1527 vcpu->arch.trap, kvmppc_get_pc(vcpu), 1528 vcpu->arch.shregs.msr); 1529 kvmppc_dump_regs(vcpu); 1530 run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 1531 run->hw.hardware_exit_reason = vcpu->arch.trap; 1532 return RESUME_HOST; 1533 } 1534 run->exit_reason = KVM_EXIT_UNKNOWN; 1535 run->ready_for_interrupt_injection = 1; 1536 switch (vcpu->arch.trap) { 1537 /* We're good on these - the host merely wanted to get our attention */ 1538 case BOOK3S_INTERRUPT_NESTED_HV_DECREMENTER: 1539 WARN_ON_ONCE(1); /* Should never happen */ 1540 vcpu->arch.trap = BOOK3S_INTERRUPT_HV_DECREMENTER; 1541 fallthrough; 1542 case BOOK3S_INTERRUPT_HV_DECREMENTER: 1543 vcpu->stat.dec_exits++; 1544 r = RESUME_GUEST; 1545 break; 1546 case BOOK3S_INTERRUPT_EXTERNAL: 1547 case BOOK3S_INTERRUPT_H_DOORBELL: 1548 case BOOK3S_INTERRUPT_H_VIRT: 1549 vcpu->stat.ext_intr_exits++; 1550 r = RESUME_GUEST; 1551 break; 1552 /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/ 1553 case BOOK3S_INTERRUPT_HMI: 1554 case BOOK3S_INTERRUPT_PERFMON: 1555 case BOOK3S_INTERRUPT_SYSTEM_RESET: 1556 r = RESUME_GUEST; 1557 break; 1558 case BOOK3S_INTERRUPT_MACHINE_CHECK: { 1559 static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL, 1560 DEFAULT_RATELIMIT_BURST); 1561 /* 1562 * Print the MCE event to host console. Ratelimit so the guest 1563 * can't flood the host log. 1564 */ 1565 if (__ratelimit(&rs)) 1566 machine_check_print_event_info(&vcpu->arch.mce_evt,false, true); 1567 1568 /* 1569 * If the guest can do FWNMI, exit to userspace so it can 1570 * deliver a FWNMI to the guest. 1571 * Otherwise we synthesize a machine check for the guest 1572 * so that it knows that the machine check occurred. 1573 */ 1574 if (!vcpu->kvm->arch.fwnmi_enabled) { 1575 ulong flags = vcpu->arch.shregs.msr & 0x083c0000; 1576 kvmppc_core_queue_machine_check(vcpu, flags); 1577 r = RESUME_GUEST; 1578 break; 1579 } 1580 1581 /* Exit to guest with KVM_EXIT_NMI as exit reason */ 1582 run->exit_reason = KVM_EXIT_NMI; 1583 run->hw.hardware_exit_reason = vcpu->arch.trap; 1584 /* Clear out the old NMI status from run->flags */ 1585 run->flags &= ~KVM_RUN_PPC_NMI_DISP_MASK; 1586 /* Now set the NMI status */ 1587 if (vcpu->arch.mce_evt.disposition == MCE_DISPOSITION_RECOVERED) 1588 run->flags |= KVM_RUN_PPC_NMI_DISP_FULLY_RECOV; 1589 else 1590 run->flags |= KVM_RUN_PPC_NMI_DISP_NOT_RECOV; 1591 1592 r = RESUME_HOST; 1593 break; 1594 } 1595 case BOOK3S_INTERRUPT_PROGRAM: 1596 { 1597 ulong flags; 1598 /* 1599 * Normally program interrupts are delivered directly 1600 * to the guest by the hardware, but we can get here 1601 * as a result of a hypervisor emulation interrupt 1602 * (e40) getting turned into a 700 by BML RTAS. 1603 */ 1604 flags = vcpu->arch.shregs.msr & 0x1f0000ull; 1605 kvmppc_core_queue_program(vcpu, flags); 1606 r = RESUME_GUEST; 1607 break; 1608 } 1609 case BOOK3S_INTERRUPT_SYSCALL: 1610 { 1611 int i; 1612 1613 if (unlikely(vcpu->arch.shregs.msr & MSR_PR)) { 1614 /* 1615 * Guest userspace executed sc 1. This can only be 1616 * reached by the P9 path because the old path 1617 * handles this case in realmode hcall handlers. 1618 */ 1619 if (!kvmhv_vcpu_is_radix(vcpu)) { 1620 /* 1621 * A guest could be running PR KVM, so this 1622 * may be a PR KVM hcall. It must be reflected 1623 * to the guest kernel as a sc interrupt. 1624 */ 1625 kvmppc_core_queue_syscall(vcpu); 1626 } else { 1627 /* 1628 * Radix guests can not run PR KVM or nested HV 1629 * hash guests which might run PR KVM, so this 1630 * is always a privilege fault. Send a program 1631 * check to guest kernel. 1632 */ 1633 kvmppc_core_queue_program(vcpu, SRR1_PROGPRIV); 1634 } 1635 r = RESUME_GUEST; 1636 break; 1637 } 1638 1639 /* 1640 * hcall - gather args and set exit_reason. This will next be 1641 * handled by kvmppc_pseries_do_hcall which may be able to deal 1642 * with it and resume guest, or may punt to userspace. 1643 */ 1644 run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3); 1645 for (i = 0; i < 9; ++i) 1646 run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i); 1647 run->exit_reason = KVM_EXIT_PAPR_HCALL; 1648 vcpu->arch.hcall_needed = 1; 1649 r = RESUME_HOST; 1650 break; 1651 } 1652 /* 1653 * We get these next two if the guest accesses a page which it thinks 1654 * it has mapped but which is not actually present, either because 1655 * it is for an emulated I/O device or because the corresonding 1656 * host page has been paged out. 1657 * 1658 * Any other HDSI/HISI interrupts have been handled already for P7/8 1659 * guests. For POWER9 hash guests not using rmhandlers, basic hash 1660 * fault handling is done here. 1661 */ 1662 case BOOK3S_INTERRUPT_H_DATA_STORAGE: { 1663 unsigned long vsid; 1664 long err; 1665 1666 if (cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG) && 1667 unlikely(vcpu->arch.fault_dsisr == HDSISR_CANARY)) { 1668 r = RESUME_GUEST; /* Just retry if it's the canary */ 1669 break; 1670 } 1671 1672 if (kvm_is_radix(vcpu->kvm) || !cpu_has_feature(CPU_FTR_ARCH_300)) { 1673 /* 1674 * Radix doesn't require anything, and pre-ISAv3.0 hash 1675 * already attempted to handle this in rmhandlers. The 1676 * hash fault handling below is v3 only (it uses ASDR 1677 * via fault_gpa). 1678 */ 1679 r = RESUME_PAGE_FAULT; 1680 break; 1681 } 1682 1683 if (!(vcpu->arch.fault_dsisr & (DSISR_NOHPTE | DSISR_PROTFAULT))) { 1684 kvmppc_core_queue_data_storage(vcpu, 1685 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); 1686 r = RESUME_GUEST; 1687 break; 1688 } 1689 1690 if (!(vcpu->arch.shregs.msr & MSR_DR)) 1691 vsid = vcpu->kvm->arch.vrma_slb_v; 1692 else 1693 vsid = vcpu->arch.fault_gpa; 1694 1695 err = kvmppc_hpte_hv_fault(vcpu, vcpu->arch.fault_dar, 1696 vsid, vcpu->arch.fault_dsisr, true); 1697 if (err == 0) { 1698 r = RESUME_GUEST; 1699 } else if (err == -1 || err == -2) { 1700 r = RESUME_PAGE_FAULT; 1701 } else { 1702 kvmppc_core_queue_data_storage(vcpu, 1703 vcpu->arch.fault_dar, err); 1704 r = RESUME_GUEST; 1705 } 1706 break; 1707 } 1708 case BOOK3S_INTERRUPT_H_INST_STORAGE: { 1709 unsigned long vsid; 1710 long err; 1711 1712 vcpu->arch.fault_dar = kvmppc_get_pc(vcpu); 1713 vcpu->arch.fault_dsisr = vcpu->arch.shregs.msr & 1714 DSISR_SRR1_MATCH_64S; 1715 if (kvm_is_radix(vcpu->kvm) || !cpu_has_feature(CPU_FTR_ARCH_300)) { 1716 /* 1717 * Radix doesn't require anything, and pre-ISAv3.0 hash 1718 * already attempted to handle this in rmhandlers. The 1719 * hash fault handling below is v3 only (it uses ASDR 1720 * via fault_gpa). 1721 */ 1722 if (vcpu->arch.shregs.msr & HSRR1_HISI_WRITE) 1723 vcpu->arch.fault_dsisr |= DSISR_ISSTORE; 1724 r = RESUME_PAGE_FAULT; 1725 break; 1726 } 1727 1728 if (!(vcpu->arch.fault_dsisr & SRR1_ISI_NOPT)) { 1729 kvmppc_core_queue_inst_storage(vcpu, 1730 vcpu->arch.fault_dsisr); 1731 r = RESUME_GUEST; 1732 break; 1733 } 1734 1735 if (!(vcpu->arch.shregs.msr & MSR_IR)) 1736 vsid = vcpu->kvm->arch.vrma_slb_v; 1737 else 1738 vsid = vcpu->arch.fault_gpa; 1739 1740 err = kvmppc_hpte_hv_fault(vcpu, vcpu->arch.fault_dar, 1741 vsid, vcpu->arch.fault_dsisr, false); 1742 if (err == 0) { 1743 r = RESUME_GUEST; 1744 } else if (err == -1) { 1745 r = RESUME_PAGE_FAULT; 1746 } else { 1747 kvmppc_core_queue_inst_storage(vcpu, err); 1748 r = RESUME_GUEST; 1749 } 1750 break; 1751 } 1752 1753 /* 1754 * This occurs if the guest executes an illegal instruction. 1755 * If the guest debug is disabled, generate a program interrupt 1756 * to the guest. If guest debug is enabled, we need to check 1757 * whether the instruction is a software breakpoint instruction. 1758 * Accordingly return to Guest or Host. 1759 */ 1760 case BOOK3S_INTERRUPT_H_EMUL_ASSIST: 1761 if (vcpu->arch.emul_inst != KVM_INST_FETCH_FAILED) 1762 vcpu->arch.last_inst = kvmppc_need_byteswap(vcpu) ? 1763 swab32(vcpu->arch.emul_inst) : 1764 vcpu->arch.emul_inst; 1765 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) { 1766 r = kvmppc_emulate_debug_inst(vcpu); 1767 } else { 1768 kvmppc_core_queue_program(vcpu, SRR1_PROGILL); 1769 r = RESUME_GUEST; 1770 } 1771 break; 1772 1773 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 1774 case BOOK3S_INTERRUPT_HV_SOFTPATCH: 1775 /* 1776 * This occurs for various TM-related instructions that 1777 * we need to emulate on POWER9 DD2.2. We have already 1778 * handled the cases where the guest was in real-suspend 1779 * mode and was transitioning to transactional state. 1780 */ 1781 r = kvmhv_p9_tm_emulation(vcpu); 1782 if (r != -1) 1783 break; 1784 fallthrough; /* go to facility unavailable handler */ 1785 #endif 1786 1787 /* 1788 * This occurs if the guest (kernel or userspace), does something that 1789 * is prohibited by HFSCR. 1790 * On POWER9, this could be a doorbell instruction that we need 1791 * to emulate. 1792 * Otherwise, we just generate a program interrupt to the guest. 1793 */ 1794 case BOOK3S_INTERRUPT_H_FAC_UNAVAIL: { 1795 u64 cause = vcpu->arch.hfscr >> 56; 1796 1797 r = EMULATE_FAIL; 1798 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 1799 if (cause == FSCR_MSGP_LG) 1800 r = kvmppc_emulate_doorbell_instr(vcpu); 1801 if (cause == FSCR_PM_LG) 1802 r = kvmppc_pmu_unavailable(vcpu); 1803 if (cause == FSCR_EBB_LG) 1804 r = kvmppc_ebb_unavailable(vcpu); 1805 if (cause == FSCR_TM_LG) 1806 r = kvmppc_tm_unavailable(vcpu); 1807 } 1808 if (r == EMULATE_FAIL) { 1809 kvmppc_core_queue_program(vcpu, SRR1_PROGILL); 1810 r = RESUME_GUEST; 1811 } 1812 break; 1813 } 1814 1815 case BOOK3S_INTERRUPT_HV_RM_HARD: 1816 r = RESUME_PASSTHROUGH; 1817 break; 1818 default: 1819 kvmppc_dump_regs(vcpu); 1820 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n", 1821 vcpu->arch.trap, kvmppc_get_pc(vcpu), 1822 vcpu->arch.shregs.msr); 1823 run->hw.hardware_exit_reason = vcpu->arch.trap; 1824 r = RESUME_HOST; 1825 break; 1826 } 1827 1828 return r; 1829 } 1830 1831 static int kvmppc_handle_nested_exit(struct kvm_vcpu *vcpu) 1832 { 1833 int r; 1834 int srcu_idx; 1835 1836 vcpu->stat.sum_exits++; 1837 1838 /* 1839 * This can happen if an interrupt occurs in the last stages 1840 * of guest entry or the first stages of guest exit (i.e. after 1841 * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV 1842 * and before setting it to KVM_GUEST_MODE_HOST_HV). 1843 * That can happen due to a bug, or due to a machine check 1844 * occurring at just the wrong time. 1845 */ 1846 if (vcpu->arch.shregs.msr & MSR_HV) { 1847 pr_emerg("KVM trap in HV mode while nested!\n"); 1848 pr_emerg("trap=0x%x | pc=0x%lx | msr=0x%llx\n", 1849 vcpu->arch.trap, kvmppc_get_pc(vcpu), 1850 vcpu->arch.shregs.msr); 1851 kvmppc_dump_regs(vcpu); 1852 return RESUME_HOST; 1853 } 1854 switch (vcpu->arch.trap) { 1855 /* We're good on these - the host merely wanted to get our attention */ 1856 case BOOK3S_INTERRUPT_HV_DECREMENTER: 1857 vcpu->stat.dec_exits++; 1858 r = RESUME_GUEST; 1859 break; 1860 case BOOK3S_INTERRUPT_EXTERNAL: 1861 vcpu->stat.ext_intr_exits++; 1862 r = RESUME_HOST; 1863 break; 1864 case BOOK3S_INTERRUPT_H_DOORBELL: 1865 case BOOK3S_INTERRUPT_H_VIRT: 1866 vcpu->stat.ext_intr_exits++; 1867 r = RESUME_GUEST; 1868 break; 1869 /* These need to go to the nested HV */ 1870 case BOOK3S_INTERRUPT_NESTED_HV_DECREMENTER: 1871 vcpu->arch.trap = BOOK3S_INTERRUPT_HV_DECREMENTER; 1872 vcpu->stat.dec_exits++; 1873 r = RESUME_HOST; 1874 break; 1875 /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/ 1876 case BOOK3S_INTERRUPT_HMI: 1877 case BOOK3S_INTERRUPT_PERFMON: 1878 case BOOK3S_INTERRUPT_SYSTEM_RESET: 1879 r = RESUME_GUEST; 1880 break; 1881 case BOOK3S_INTERRUPT_MACHINE_CHECK: 1882 { 1883 static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL, 1884 DEFAULT_RATELIMIT_BURST); 1885 /* Pass the machine check to the L1 guest */ 1886 r = RESUME_HOST; 1887 /* Print the MCE event to host console. */ 1888 if (__ratelimit(&rs)) 1889 machine_check_print_event_info(&vcpu->arch.mce_evt, false, true); 1890 break; 1891 } 1892 /* 1893 * We get these next two if the guest accesses a page which it thinks 1894 * it has mapped but which is not actually present, either because 1895 * it is for an emulated I/O device or because the corresonding 1896 * host page has been paged out. 1897 */ 1898 case BOOK3S_INTERRUPT_H_DATA_STORAGE: 1899 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 1900 r = kvmhv_nested_page_fault(vcpu); 1901 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 1902 break; 1903 case BOOK3S_INTERRUPT_H_INST_STORAGE: 1904 vcpu->arch.fault_dar = kvmppc_get_pc(vcpu); 1905 vcpu->arch.fault_dsisr = kvmppc_get_msr(vcpu) & 1906 DSISR_SRR1_MATCH_64S; 1907 if (vcpu->arch.shregs.msr & HSRR1_HISI_WRITE) 1908 vcpu->arch.fault_dsisr |= DSISR_ISSTORE; 1909 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 1910 r = kvmhv_nested_page_fault(vcpu); 1911 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 1912 break; 1913 1914 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 1915 case BOOK3S_INTERRUPT_HV_SOFTPATCH: 1916 /* 1917 * This occurs for various TM-related instructions that 1918 * we need to emulate on POWER9 DD2.2. We have already 1919 * handled the cases where the guest was in real-suspend 1920 * mode and was transitioning to transactional state. 1921 */ 1922 r = kvmhv_p9_tm_emulation(vcpu); 1923 if (r != -1) 1924 break; 1925 fallthrough; /* go to facility unavailable handler */ 1926 #endif 1927 1928 case BOOK3S_INTERRUPT_H_FAC_UNAVAIL: { 1929 u64 cause = vcpu->arch.hfscr >> 56; 1930 1931 /* 1932 * Only pass HFU interrupts to the L1 if the facility is 1933 * permitted but disabled by the L1's HFSCR, otherwise 1934 * the interrupt does not make sense to the L1 so turn 1935 * it into a HEAI. 1936 */ 1937 if (!(vcpu->arch.hfscr_permitted & (1UL << cause)) || 1938 (vcpu->arch.nested_hfscr & (1UL << cause))) { 1939 vcpu->arch.trap = BOOK3S_INTERRUPT_H_EMUL_ASSIST; 1940 1941 /* 1942 * If the fetch failed, return to guest and 1943 * try executing it again. 1944 */ 1945 r = kvmppc_get_last_inst(vcpu, INST_GENERIC, 1946 &vcpu->arch.emul_inst); 1947 if (r != EMULATE_DONE) 1948 r = RESUME_GUEST; 1949 else 1950 r = RESUME_HOST; 1951 } else { 1952 r = RESUME_HOST; 1953 } 1954 1955 break; 1956 } 1957 1958 case BOOK3S_INTERRUPT_HV_RM_HARD: 1959 vcpu->arch.trap = 0; 1960 r = RESUME_GUEST; 1961 if (!xics_on_xive()) 1962 kvmppc_xics_rm_complete(vcpu, 0); 1963 break; 1964 case BOOK3S_INTERRUPT_SYSCALL: 1965 { 1966 unsigned long req = kvmppc_get_gpr(vcpu, 3); 1967 1968 /* 1969 * The H_RPT_INVALIDATE hcalls issued by nested 1970 * guests for process-scoped invalidations when 1971 * GTSE=0, are handled here in L0. 1972 */ 1973 if (req == H_RPT_INVALIDATE) { 1974 r = kvmppc_nested_h_rpt_invalidate(vcpu); 1975 break; 1976 } 1977 1978 r = RESUME_HOST; 1979 break; 1980 } 1981 default: 1982 r = RESUME_HOST; 1983 break; 1984 } 1985 1986 return r; 1987 } 1988 1989 static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu, 1990 struct kvm_sregs *sregs) 1991 { 1992 int i; 1993 1994 memset(sregs, 0, sizeof(struct kvm_sregs)); 1995 sregs->pvr = vcpu->arch.pvr; 1996 for (i = 0; i < vcpu->arch.slb_max; i++) { 1997 sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige; 1998 sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv; 1999 } 2000 2001 return 0; 2002 } 2003 2004 static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu, 2005 struct kvm_sregs *sregs) 2006 { 2007 int i, j; 2008 2009 /* Only accept the same PVR as the host's, since we can't spoof it */ 2010 if (sregs->pvr != vcpu->arch.pvr) 2011 return -EINVAL; 2012 2013 j = 0; 2014 for (i = 0; i < vcpu->arch.slb_nr; i++) { 2015 if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) { 2016 vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe; 2017 vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv; 2018 ++j; 2019 } 2020 } 2021 vcpu->arch.slb_max = j; 2022 2023 return 0; 2024 } 2025 2026 /* 2027 * Enforce limits on guest LPCR values based on hardware availability, 2028 * guest configuration, and possibly hypervisor support and security 2029 * concerns. 2030 */ 2031 unsigned long kvmppc_filter_lpcr_hv(struct kvm *kvm, unsigned long lpcr) 2032 { 2033 /* LPCR_TC only applies to HPT guests */ 2034 if (kvm_is_radix(kvm)) 2035 lpcr &= ~LPCR_TC; 2036 2037 /* On POWER8 and above, userspace can modify AIL */ 2038 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) 2039 lpcr &= ~LPCR_AIL; 2040 if ((lpcr & LPCR_AIL) != LPCR_AIL_3) 2041 lpcr &= ~LPCR_AIL; /* LPCR[AIL]=1/2 is disallowed */ 2042 /* 2043 * On some POWER9s we force AIL off for radix guests to prevent 2044 * executing in MSR[HV]=1 mode with the MMU enabled and PIDR set to 2045 * guest, which can result in Q0 translations with LPID=0 PID=PIDR to 2046 * be cached, which the host TLB management does not expect. 2047 */ 2048 if (kvm_is_radix(kvm) && cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG)) 2049 lpcr &= ~LPCR_AIL; 2050 2051 /* 2052 * On POWER9, allow userspace to enable large decrementer for the 2053 * guest, whether or not the host has it enabled. 2054 */ 2055 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 2056 lpcr &= ~LPCR_LD; 2057 2058 return lpcr; 2059 } 2060 2061 static void verify_lpcr(struct kvm *kvm, unsigned long lpcr) 2062 { 2063 if (lpcr != kvmppc_filter_lpcr_hv(kvm, lpcr)) { 2064 WARN_ONCE(1, "lpcr 0x%lx differs from filtered 0x%lx\n", 2065 lpcr, kvmppc_filter_lpcr_hv(kvm, lpcr)); 2066 } 2067 } 2068 2069 static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr, 2070 bool preserve_top32) 2071 { 2072 struct kvm *kvm = vcpu->kvm; 2073 struct kvmppc_vcore *vc = vcpu->arch.vcore; 2074 u64 mask; 2075 2076 spin_lock(&vc->lock); 2077 2078 /* 2079 * Userspace can only modify 2080 * DPFD (default prefetch depth), ILE (interrupt little-endian), 2081 * TC (translation control), AIL (alternate interrupt location), 2082 * LD (large decrementer). 2083 * These are subject to restrictions from kvmppc_filter_lcpr_hv(). 2084 */ 2085 mask = LPCR_DPFD | LPCR_ILE | LPCR_TC | LPCR_AIL | LPCR_LD; 2086 2087 /* Broken 32-bit version of LPCR must not clear top bits */ 2088 if (preserve_top32) 2089 mask &= 0xFFFFFFFF; 2090 2091 new_lpcr = kvmppc_filter_lpcr_hv(kvm, 2092 (vc->lpcr & ~mask) | (new_lpcr & mask)); 2093 2094 /* 2095 * If ILE (interrupt little-endian) has changed, update the 2096 * MSR_LE bit in the intr_msr for each vcpu in this vcore. 2097 */ 2098 if ((new_lpcr & LPCR_ILE) != (vc->lpcr & LPCR_ILE)) { 2099 struct kvm_vcpu *vcpu; 2100 unsigned long i; 2101 2102 kvm_for_each_vcpu(i, vcpu, kvm) { 2103 if (vcpu->arch.vcore != vc) 2104 continue; 2105 if (new_lpcr & LPCR_ILE) 2106 vcpu->arch.intr_msr |= MSR_LE; 2107 else 2108 vcpu->arch.intr_msr &= ~MSR_LE; 2109 } 2110 } 2111 2112 vc->lpcr = new_lpcr; 2113 2114 spin_unlock(&vc->lock); 2115 } 2116 2117 static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, 2118 union kvmppc_one_reg *val) 2119 { 2120 int r = 0; 2121 long int i; 2122 2123 switch (id) { 2124 case KVM_REG_PPC_DEBUG_INST: 2125 *val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT); 2126 break; 2127 case KVM_REG_PPC_HIOR: 2128 *val = get_reg_val(id, 0); 2129 break; 2130 case KVM_REG_PPC_DABR: 2131 *val = get_reg_val(id, vcpu->arch.dabr); 2132 break; 2133 case KVM_REG_PPC_DABRX: 2134 *val = get_reg_val(id, vcpu->arch.dabrx); 2135 break; 2136 case KVM_REG_PPC_DSCR: 2137 *val = get_reg_val(id, vcpu->arch.dscr); 2138 break; 2139 case KVM_REG_PPC_PURR: 2140 *val = get_reg_val(id, vcpu->arch.purr); 2141 break; 2142 case KVM_REG_PPC_SPURR: 2143 *val = get_reg_val(id, vcpu->arch.spurr); 2144 break; 2145 case KVM_REG_PPC_AMR: 2146 *val = get_reg_val(id, vcpu->arch.amr); 2147 break; 2148 case KVM_REG_PPC_UAMOR: 2149 *val = get_reg_val(id, vcpu->arch.uamor); 2150 break; 2151 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCR1: 2152 i = id - KVM_REG_PPC_MMCR0; 2153 *val = get_reg_val(id, vcpu->arch.mmcr[i]); 2154 break; 2155 case KVM_REG_PPC_MMCR2: 2156 *val = get_reg_val(id, vcpu->arch.mmcr[2]); 2157 break; 2158 case KVM_REG_PPC_MMCRA: 2159 *val = get_reg_val(id, vcpu->arch.mmcra); 2160 break; 2161 case KVM_REG_PPC_MMCRS: 2162 *val = get_reg_val(id, vcpu->arch.mmcrs); 2163 break; 2164 case KVM_REG_PPC_MMCR3: 2165 *val = get_reg_val(id, vcpu->arch.mmcr[3]); 2166 break; 2167 case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8: 2168 i = id - KVM_REG_PPC_PMC1; 2169 *val = get_reg_val(id, vcpu->arch.pmc[i]); 2170 break; 2171 case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2: 2172 i = id - KVM_REG_PPC_SPMC1; 2173 *val = get_reg_val(id, vcpu->arch.spmc[i]); 2174 break; 2175 case KVM_REG_PPC_SIAR: 2176 *val = get_reg_val(id, vcpu->arch.siar); 2177 break; 2178 case KVM_REG_PPC_SDAR: 2179 *val = get_reg_val(id, vcpu->arch.sdar); 2180 break; 2181 case KVM_REG_PPC_SIER: 2182 *val = get_reg_val(id, vcpu->arch.sier[0]); 2183 break; 2184 case KVM_REG_PPC_SIER2: 2185 *val = get_reg_val(id, vcpu->arch.sier[1]); 2186 break; 2187 case KVM_REG_PPC_SIER3: 2188 *val = get_reg_val(id, vcpu->arch.sier[2]); 2189 break; 2190 case KVM_REG_PPC_IAMR: 2191 *val = get_reg_val(id, vcpu->arch.iamr); 2192 break; 2193 case KVM_REG_PPC_PSPB: 2194 *val = get_reg_val(id, vcpu->arch.pspb); 2195 break; 2196 case KVM_REG_PPC_DPDES: 2197 /* 2198 * On POWER9, where we are emulating msgsndp etc., 2199 * we return 1 bit for each vcpu, which can come from 2200 * either vcore->dpdes or doorbell_request. 2201 * On POWER8, doorbell_request is 0. 2202 */ 2203 if (cpu_has_feature(CPU_FTR_ARCH_300)) 2204 *val = get_reg_val(id, vcpu->arch.doorbell_request); 2205 else 2206 *val = get_reg_val(id, vcpu->arch.vcore->dpdes); 2207 break; 2208 case KVM_REG_PPC_VTB: 2209 *val = get_reg_val(id, vcpu->arch.vcore->vtb); 2210 break; 2211 case KVM_REG_PPC_DAWR: 2212 *val = get_reg_val(id, vcpu->arch.dawr0); 2213 break; 2214 case KVM_REG_PPC_DAWRX: 2215 *val = get_reg_val(id, vcpu->arch.dawrx0); 2216 break; 2217 case KVM_REG_PPC_DAWR1: 2218 *val = get_reg_val(id, vcpu->arch.dawr1); 2219 break; 2220 case KVM_REG_PPC_DAWRX1: 2221 *val = get_reg_val(id, vcpu->arch.dawrx1); 2222 break; 2223 case KVM_REG_PPC_CIABR: 2224 *val = get_reg_val(id, vcpu->arch.ciabr); 2225 break; 2226 case KVM_REG_PPC_CSIGR: 2227 *val = get_reg_val(id, vcpu->arch.csigr); 2228 break; 2229 case KVM_REG_PPC_TACR: 2230 *val = get_reg_val(id, vcpu->arch.tacr); 2231 break; 2232 case KVM_REG_PPC_TCSCR: 2233 *val = get_reg_val(id, vcpu->arch.tcscr); 2234 break; 2235 case KVM_REG_PPC_PID: 2236 *val = get_reg_val(id, vcpu->arch.pid); 2237 break; 2238 case KVM_REG_PPC_ACOP: 2239 *val = get_reg_val(id, vcpu->arch.acop); 2240 break; 2241 case KVM_REG_PPC_WORT: 2242 *val = get_reg_val(id, vcpu->arch.wort); 2243 break; 2244 case KVM_REG_PPC_TIDR: 2245 *val = get_reg_val(id, vcpu->arch.tid); 2246 break; 2247 case KVM_REG_PPC_PSSCR: 2248 *val = get_reg_val(id, vcpu->arch.psscr); 2249 break; 2250 case KVM_REG_PPC_VPA_ADDR: 2251 spin_lock(&vcpu->arch.vpa_update_lock); 2252 *val = get_reg_val(id, vcpu->arch.vpa.next_gpa); 2253 spin_unlock(&vcpu->arch.vpa_update_lock); 2254 break; 2255 case KVM_REG_PPC_VPA_SLB: 2256 spin_lock(&vcpu->arch.vpa_update_lock); 2257 val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa; 2258 val->vpaval.length = vcpu->arch.slb_shadow.len; 2259 spin_unlock(&vcpu->arch.vpa_update_lock); 2260 break; 2261 case KVM_REG_PPC_VPA_DTL: 2262 spin_lock(&vcpu->arch.vpa_update_lock); 2263 val->vpaval.addr = vcpu->arch.dtl.next_gpa; 2264 val->vpaval.length = vcpu->arch.dtl.len; 2265 spin_unlock(&vcpu->arch.vpa_update_lock); 2266 break; 2267 case KVM_REG_PPC_TB_OFFSET: 2268 *val = get_reg_val(id, vcpu->arch.vcore->tb_offset); 2269 break; 2270 case KVM_REG_PPC_LPCR: 2271 case KVM_REG_PPC_LPCR_64: 2272 *val = get_reg_val(id, vcpu->arch.vcore->lpcr); 2273 break; 2274 case KVM_REG_PPC_PPR: 2275 *val = get_reg_val(id, vcpu->arch.ppr); 2276 break; 2277 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 2278 case KVM_REG_PPC_TFHAR: 2279 *val = get_reg_val(id, vcpu->arch.tfhar); 2280 break; 2281 case KVM_REG_PPC_TFIAR: 2282 *val = get_reg_val(id, vcpu->arch.tfiar); 2283 break; 2284 case KVM_REG_PPC_TEXASR: 2285 *val = get_reg_val(id, vcpu->arch.texasr); 2286 break; 2287 case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31: 2288 i = id - KVM_REG_PPC_TM_GPR0; 2289 *val = get_reg_val(id, vcpu->arch.gpr_tm[i]); 2290 break; 2291 case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63: 2292 { 2293 int j; 2294 i = id - KVM_REG_PPC_TM_VSR0; 2295 if (i < 32) 2296 for (j = 0; j < TS_FPRWIDTH; j++) 2297 val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j]; 2298 else { 2299 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 2300 val->vval = vcpu->arch.vr_tm.vr[i-32]; 2301 else 2302 r = -ENXIO; 2303 } 2304 break; 2305 } 2306 case KVM_REG_PPC_TM_CR: 2307 *val = get_reg_val(id, vcpu->arch.cr_tm); 2308 break; 2309 case KVM_REG_PPC_TM_XER: 2310 *val = get_reg_val(id, vcpu->arch.xer_tm); 2311 break; 2312 case KVM_REG_PPC_TM_LR: 2313 *val = get_reg_val(id, vcpu->arch.lr_tm); 2314 break; 2315 case KVM_REG_PPC_TM_CTR: 2316 *val = get_reg_val(id, vcpu->arch.ctr_tm); 2317 break; 2318 case KVM_REG_PPC_TM_FPSCR: 2319 *val = get_reg_val(id, vcpu->arch.fp_tm.fpscr); 2320 break; 2321 case KVM_REG_PPC_TM_AMR: 2322 *val = get_reg_val(id, vcpu->arch.amr_tm); 2323 break; 2324 case KVM_REG_PPC_TM_PPR: 2325 *val = get_reg_val(id, vcpu->arch.ppr_tm); 2326 break; 2327 case KVM_REG_PPC_TM_VRSAVE: 2328 *val = get_reg_val(id, vcpu->arch.vrsave_tm); 2329 break; 2330 case KVM_REG_PPC_TM_VSCR: 2331 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 2332 *val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]); 2333 else 2334 r = -ENXIO; 2335 break; 2336 case KVM_REG_PPC_TM_DSCR: 2337 *val = get_reg_val(id, vcpu->arch.dscr_tm); 2338 break; 2339 case KVM_REG_PPC_TM_TAR: 2340 *val = get_reg_val(id, vcpu->arch.tar_tm); 2341 break; 2342 #endif 2343 case KVM_REG_PPC_ARCH_COMPAT: 2344 *val = get_reg_val(id, vcpu->arch.vcore->arch_compat); 2345 break; 2346 case KVM_REG_PPC_DEC_EXPIRY: 2347 *val = get_reg_val(id, vcpu->arch.dec_expires); 2348 break; 2349 case KVM_REG_PPC_ONLINE: 2350 *val = get_reg_val(id, vcpu->arch.online); 2351 break; 2352 case KVM_REG_PPC_PTCR: 2353 *val = get_reg_val(id, vcpu->kvm->arch.l1_ptcr); 2354 break; 2355 default: 2356 r = -EINVAL; 2357 break; 2358 } 2359 2360 return r; 2361 } 2362 2363 static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, 2364 union kvmppc_one_reg *val) 2365 { 2366 int r = 0; 2367 long int i; 2368 unsigned long addr, len; 2369 2370 switch (id) { 2371 case KVM_REG_PPC_HIOR: 2372 /* Only allow this to be set to zero */ 2373 if (set_reg_val(id, *val)) 2374 r = -EINVAL; 2375 break; 2376 case KVM_REG_PPC_DABR: 2377 vcpu->arch.dabr = set_reg_val(id, *val); 2378 break; 2379 case KVM_REG_PPC_DABRX: 2380 vcpu->arch.dabrx = set_reg_val(id, *val) & ~DABRX_HYP; 2381 break; 2382 case KVM_REG_PPC_DSCR: 2383 vcpu->arch.dscr = set_reg_val(id, *val); 2384 break; 2385 case KVM_REG_PPC_PURR: 2386 vcpu->arch.purr = set_reg_val(id, *val); 2387 break; 2388 case KVM_REG_PPC_SPURR: 2389 vcpu->arch.spurr = set_reg_val(id, *val); 2390 break; 2391 case KVM_REG_PPC_AMR: 2392 vcpu->arch.amr = set_reg_val(id, *val); 2393 break; 2394 case KVM_REG_PPC_UAMOR: 2395 vcpu->arch.uamor = set_reg_val(id, *val); 2396 break; 2397 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCR1: 2398 i = id - KVM_REG_PPC_MMCR0; 2399 vcpu->arch.mmcr[i] = set_reg_val(id, *val); 2400 break; 2401 case KVM_REG_PPC_MMCR2: 2402 vcpu->arch.mmcr[2] = set_reg_val(id, *val); 2403 break; 2404 case KVM_REG_PPC_MMCRA: 2405 vcpu->arch.mmcra = set_reg_val(id, *val); 2406 break; 2407 case KVM_REG_PPC_MMCRS: 2408 vcpu->arch.mmcrs = set_reg_val(id, *val); 2409 break; 2410 case KVM_REG_PPC_MMCR3: 2411 *val = get_reg_val(id, vcpu->arch.mmcr[3]); 2412 break; 2413 case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8: 2414 i = id - KVM_REG_PPC_PMC1; 2415 vcpu->arch.pmc[i] = set_reg_val(id, *val); 2416 break; 2417 case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2: 2418 i = id - KVM_REG_PPC_SPMC1; 2419 vcpu->arch.spmc[i] = set_reg_val(id, *val); 2420 break; 2421 case KVM_REG_PPC_SIAR: 2422 vcpu->arch.siar = set_reg_val(id, *val); 2423 break; 2424 case KVM_REG_PPC_SDAR: 2425 vcpu->arch.sdar = set_reg_val(id, *val); 2426 break; 2427 case KVM_REG_PPC_SIER: 2428 vcpu->arch.sier[0] = set_reg_val(id, *val); 2429 break; 2430 case KVM_REG_PPC_SIER2: 2431 vcpu->arch.sier[1] = set_reg_val(id, *val); 2432 break; 2433 case KVM_REG_PPC_SIER3: 2434 vcpu->arch.sier[2] = set_reg_val(id, *val); 2435 break; 2436 case KVM_REG_PPC_IAMR: 2437 vcpu->arch.iamr = set_reg_val(id, *val); 2438 break; 2439 case KVM_REG_PPC_PSPB: 2440 vcpu->arch.pspb = set_reg_val(id, *val); 2441 break; 2442 case KVM_REG_PPC_DPDES: 2443 if (cpu_has_feature(CPU_FTR_ARCH_300)) 2444 vcpu->arch.doorbell_request = set_reg_val(id, *val) & 1; 2445 else 2446 vcpu->arch.vcore->dpdes = set_reg_val(id, *val); 2447 break; 2448 case KVM_REG_PPC_VTB: 2449 vcpu->arch.vcore->vtb = set_reg_val(id, *val); 2450 break; 2451 case KVM_REG_PPC_DAWR: 2452 vcpu->arch.dawr0 = set_reg_val(id, *val); 2453 break; 2454 case KVM_REG_PPC_DAWRX: 2455 vcpu->arch.dawrx0 = set_reg_val(id, *val) & ~DAWRX_HYP; 2456 break; 2457 case KVM_REG_PPC_DAWR1: 2458 vcpu->arch.dawr1 = set_reg_val(id, *val); 2459 break; 2460 case KVM_REG_PPC_DAWRX1: 2461 vcpu->arch.dawrx1 = set_reg_val(id, *val) & ~DAWRX_HYP; 2462 break; 2463 case KVM_REG_PPC_CIABR: 2464 vcpu->arch.ciabr = set_reg_val(id, *val); 2465 /* Don't allow setting breakpoints in hypervisor code */ 2466 if ((vcpu->arch.ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER) 2467 vcpu->arch.ciabr &= ~CIABR_PRIV; /* disable */ 2468 break; 2469 case KVM_REG_PPC_CSIGR: 2470 vcpu->arch.csigr = set_reg_val(id, *val); 2471 break; 2472 case KVM_REG_PPC_TACR: 2473 vcpu->arch.tacr = set_reg_val(id, *val); 2474 break; 2475 case KVM_REG_PPC_TCSCR: 2476 vcpu->arch.tcscr = set_reg_val(id, *val); 2477 break; 2478 case KVM_REG_PPC_PID: 2479 vcpu->arch.pid = set_reg_val(id, *val); 2480 break; 2481 case KVM_REG_PPC_ACOP: 2482 vcpu->arch.acop = set_reg_val(id, *val); 2483 break; 2484 case KVM_REG_PPC_WORT: 2485 vcpu->arch.wort = set_reg_val(id, *val); 2486 break; 2487 case KVM_REG_PPC_TIDR: 2488 vcpu->arch.tid = set_reg_val(id, *val); 2489 break; 2490 case KVM_REG_PPC_PSSCR: 2491 vcpu->arch.psscr = set_reg_val(id, *val) & PSSCR_GUEST_VIS; 2492 break; 2493 case KVM_REG_PPC_VPA_ADDR: 2494 addr = set_reg_val(id, *val); 2495 r = -EINVAL; 2496 if (!addr && (vcpu->arch.slb_shadow.next_gpa || 2497 vcpu->arch.dtl.next_gpa)) 2498 break; 2499 r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca)); 2500 break; 2501 case KVM_REG_PPC_VPA_SLB: 2502 addr = val->vpaval.addr; 2503 len = val->vpaval.length; 2504 r = -EINVAL; 2505 if (addr && !vcpu->arch.vpa.next_gpa) 2506 break; 2507 r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len); 2508 break; 2509 case KVM_REG_PPC_VPA_DTL: 2510 addr = val->vpaval.addr; 2511 len = val->vpaval.length; 2512 r = -EINVAL; 2513 if (addr && (len < sizeof(struct dtl_entry) || 2514 !vcpu->arch.vpa.next_gpa)) 2515 break; 2516 len -= len % sizeof(struct dtl_entry); 2517 r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len); 2518 break; 2519 case KVM_REG_PPC_TB_OFFSET: 2520 /* round up to multiple of 2^24 */ 2521 vcpu->arch.vcore->tb_offset = 2522 ALIGN(set_reg_val(id, *val), 1UL << 24); 2523 break; 2524 case KVM_REG_PPC_LPCR: 2525 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), true); 2526 break; 2527 case KVM_REG_PPC_LPCR_64: 2528 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), false); 2529 break; 2530 case KVM_REG_PPC_PPR: 2531 vcpu->arch.ppr = set_reg_val(id, *val); 2532 break; 2533 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 2534 case KVM_REG_PPC_TFHAR: 2535 vcpu->arch.tfhar = set_reg_val(id, *val); 2536 break; 2537 case KVM_REG_PPC_TFIAR: 2538 vcpu->arch.tfiar = set_reg_val(id, *val); 2539 break; 2540 case KVM_REG_PPC_TEXASR: 2541 vcpu->arch.texasr = set_reg_val(id, *val); 2542 break; 2543 case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31: 2544 i = id - KVM_REG_PPC_TM_GPR0; 2545 vcpu->arch.gpr_tm[i] = set_reg_val(id, *val); 2546 break; 2547 case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63: 2548 { 2549 int j; 2550 i = id - KVM_REG_PPC_TM_VSR0; 2551 if (i < 32) 2552 for (j = 0; j < TS_FPRWIDTH; j++) 2553 vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j]; 2554 else 2555 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 2556 vcpu->arch.vr_tm.vr[i-32] = val->vval; 2557 else 2558 r = -ENXIO; 2559 break; 2560 } 2561 case KVM_REG_PPC_TM_CR: 2562 vcpu->arch.cr_tm = set_reg_val(id, *val); 2563 break; 2564 case KVM_REG_PPC_TM_XER: 2565 vcpu->arch.xer_tm = set_reg_val(id, *val); 2566 break; 2567 case KVM_REG_PPC_TM_LR: 2568 vcpu->arch.lr_tm = set_reg_val(id, *val); 2569 break; 2570 case KVM_REG_PPC_TM_CTR: 2571 vcpu->arch.ctr_tm = set_reg_val(id, *val); 2572 break; 2573 case KVM_REG_PPC_TM_FPSCR: 2574 vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val); 2575 break; 2576 case KVM_REG_PPC_TM_AMR: 2577 vcpu->arch.amr_tm = set_reg_val(id, *val); 2578 break; 2579 case KVM_REG_PPC_TM_PPR: 2580 vcpu->arch.ppr_tm = set_reg_val(id, *val); 2581 break; 2582 case KVM_REG_PPC_TM_VRSAVE: 2583 vcpu->arch.vrsave_tm = set_reg_val(id, *val); 2584 break; 2585 case KVM_REG_PPC_TM_VSCR: 2586 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 2587 vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val); 2588 else 2589 r = - ENXIO; 2590 break; 2591 case KVM_REG_PPC_TM_DSCR: 2592 vcpu->arch.dscr_tm = set_reg_val(id, *val); 2593 break; 2594 case KVM_REG_PPC_TM_TAR: 2595 vcpu->arch.tar_tm = set_reg_val(id, *val); 2596 break; 2597 #endif 2598 case KVM_REG_PPC_ARCH_COMPAT: 2599 r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val)); 2600 break; 2601 case KVM_REG_PPC_DEC_EXPIRY: 2602 vcpu->arch.dec_expires = set_reg_val(id, *val); 2603 break; 2604 case KVM_REG_PPC_ONLINE: 2605 i = set_reg_val(id, *val); 2606 if (i && !vcpu->arch.online) 2607 atomic_inc(&vcpu->arch.vcore->online_count); 2608 else if (!i && vcpu->arch.online) 2609 atomic_dec(&vcpu->arch.vcore->online_count); 2610 vcpu->arch.online = i; 2611 break; 2612 case KVM_REG_PPC_PTCR: 2613 vcpu->kvm->arch.l1_ptcr = set_reg_val(id, *val); 2614 break; 2615 default: 2616 r = -EINVAL; 2617 break; 2618 } 2619 2620 return r; 2621 } 2622 2623 /* 2624 * On POWER9, threads are independent and can be in different partitions. 2625 * Therefore we consider each thread to be a subcore. 2626 * There is a restriction that all threads have to be in the same 2627 * MMU mode (radix or HPT), unfortunately, but since we only support 2628 * HPT guests on a HPT host so far, that isn't an impediment yet. 2629 */ 2630 static int threads_per_vcore(struct kvm *kvm) 2631 { 2632 if (cpu_has_feature(CPU_FTR_ARCH_300)) 2633 return 1; 2634 return threads_per_subcore; 2635 } 2636 2637 static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int id) 2638 { 2639 struct kvmppc_vcore *vcore; 2640 2641 vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL); 2642 2643 if (vcore == NULL) 2644 return NULL; 2645 2646 spin_lock_init(&vcore->lock); 2647 spin_lock_init(&vcore->stoltb_lock); 2648 rcuwait_init(&vcore->wait); 2649 vcore->preempt_tb = TB_NIL; 2650 vcore->lpcr = kvm->arch.lpcr; 2651 vcore->first_vcpuid = id; 2652 vcore->kvm = kvm; 2653 INIT_LIST_HEAD(&vcore->preempt_list); 2654 2655 return vcore; 2656 } 2657 2658 #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING 2659 static struct debugfs_timings_element { 2660 const char *name; 2661 size_t offset; 2662 } timings[] = { 2663 {"rm_entry", offsetof(struct kvm_vcpu, arch.rm_entry)}, 2664 {"rm_intr", offsetof(struct kvm_vcpu, arch.rm_intr)}, 2665 {"rm_exit", offsetof(struct kvm_vcpu, arch.rm_exit)}, 2666 {"guest", offsetof(struct kvm_vcpu, arch.guest_time)}, 2667 {"cede", offsetof(struct kvm_vcpu, arch.cede_time)}, 2668 }; 2669 2670 #define N_TIMINGS (ARRAY_SIZE(timings)) 2671 2672 struct debugfs_timings_state { 2673 struct kvm_vcpu *vcpu; 2674 unsigned int buflen; 2675 char buf[N_TIMINGS * 100]; 2676 }; 2677 2678 static int debugfs_timings_open(struct inode *inode, struct file *file) 2679 { 2680 struct kvm_vcpu *vcpu = inode->i_private; 2681 struct debugfs_timings_state *p; 2682 2683 p = kzalloc(sizeof(*p), GFP_KERNEL); 2684 if (!p) 2685 return -ENOMEM; 2686 2687 kvm_get_kvm(vcpu->kvm); 2688 p->vcpu = vcpu; 2689 file->private_data = p; 2690 2691 return nonseekable_open(inode, file); 2692 } 2693 2694 static int debugfs_timings_release(struct inode *inode, struct file *file) 2695 { 2696 struct debugfs_timings_state *p = file->private_data; 2697 2698 kvm_put_kvm(p->vcpu->kvm); 2699 kfree(p); 2700 return 0; 2701 } 2702 2703 static ssize_t debugfs_timings_read(struct file *file, char __user *buf, 2704 size_t len, loff_t *ppos) 2705 { 2706 struct debugfs_timings_state *p = file->private_data; 2707 struct kvm_vcpu *vcpu = p->vcpu; 2708 char *s, *buf_end; 2709 struct kvmhv_tb_accumulator tb; 2710 u64 count; 2711 loff_t pos; 2712 ssize_t n; 2713 int i, loops; 2714 bool ok; 2715 2716 if (!p->buflen) { 2717 s = p->buf; 2718 buf_end = s + sizeof(p->buf); 2719 for (i = 0; i < N_TIMINGS; ++i) { 2720 struct kvmhv_tb_accumulator *acc; 2721 2722 acc = (struct kvmhv_tb_accumulator *) 2723 ((unsigned long)vcpu + timings[i].offset); 2724 ok = false; 2725 for (loops = 0; loops < 1000; ++loops) { 2726 count = acc->seqcount; 2727 if (!(count & 1)) { 2728 smp_rmb(); 2729 tb = *acc; 2730 smp_rmb(); 2731 if (count == acc->seqcount) { 2732 ok = true; 2733 break; 2734 } 2735 } 2736 udelay(1); 2737 } 2738 if (!ok) 2739 snprintf(s, buf_end - s, "%s: stuck\n", 2740 timings[i].name); 2741 else 2742 snprintf(s, buf_end - s, 2743 "%s: %llu %llu %llu %llu\n", 2744 timings[i].name, count / 2, 2745 tb_to_ns(tb.tb_total), 2746 tb_to_ns(tb.tb_min), 2747 tb_to_ns(tb.tb_max)); 2748 s += strlen(s); 2749 } 2750 p->buflen = s - p->buf; 2751 } 2752 2753 pos = *ppos; 2754 if (pos >= p->buflen) 2755 return 0; 2756 if (len > p->buflen - pos) 2757 len = p->buflen - pos; 2758 n = copy_to_user(buf, p->buf + pos, len); 2759 if (n) { 2760 if (n == len) 2761 return -EFAULT; 2762 len -= n; 2763 } 2764 *ppos = pos + len; 2765 return len; 2766 } 2767 2768 static ssize_t debugfs_timings_write(struct file *file, const char __user *buf, 2769 size_t len, loff_t *ppos) 2770 { 2771 return -EACCES; 2772 } 2773 2774 static const struct file_operations debugfs_timings_ops = { 2775 .owner = THIS_MODULE, 2776 .open = debugfs_timings_open, 2777 .release = debugfs_timings_release, 2778 .read = debugfs_timings_read, 2779 .write = debugfs_timings_write, 2780 .llseek = generic_file_llseek, 2781 }; 2782 2783 /* Create a debugfs directory for the vcpu */ 2784 static int kvmppc_arch_create_vcpu_debugfs_hv(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry) 2785 { 2786 debugfs_create_file("timings", 0444, debugfs_dentry, vcpu, 2787 &debugfs_timings_ops); 2788 return 0; 2789 } 2790 2791 #else /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ 2792 static int kvmppc_arch_create_vcpu_debugfs_hv(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry) 2793 { 2794 return 0; 2795 } 2796 #endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ 2797 2798 static int kvmppc_core_vcpu_create_hv(struct kvm_vcpu *vcpu) 2799 { 2800 int err; 2801 int core; 2802 struct kvmppc_vcore *vcore; 2803 struct kvm *kvm; 2804 unsigned int id; 2805 2806 kvm = vcpu->kvm; 2807 id = vcpu->vcpu_id; 2808 2809 vcpu->arch.shared = &vcpu->arch.shregs; 2810 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE 2811 /* 2812 * The shared struct is never shared on HV, 2813 * so we can always use host endianness 2814 */ 2815 #ifdef __BIG_ENDIAN__ 2816 vcpu->arch.shared_big_endian = true; 2817 #else 2818 vcpu->arch.shared_big_endian = false; 2819 #endif 2820 #endif 2821 vcpu->arch.mmcr[0] = MMCR0_FC; 2822 if (cpu_has_feature(CPU_FTR_ARCH_31)) { 2823 vcpu->arch.mmcr[0] |= MMCR0_PMCCEXT; 2824 vcpu->arch.mmcra = MMCRA_BHRB_DISABLE; 2825 } 2826 2827 vcpu->arch.ctrl = CTRL_RUNLATCH; 2828 /* default to host PVR, since we can't spoof it */ 2829 kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR)); 2830 spin_lock_init(&vcpu->arch.vpa_update_lock); 2831 spin_lock_init(&vcpu->arch.tbacct_lock); 2832 vcpu->arch.busy_preempt = TB_NIL; 2833 vcpu->arch.shregs.msr = MSR_ME; 2834 vcpu->arch.intr_msr = MSR_SF | MSR_ME; 2835 2836 /* 2837 * Set the default HFSCR for the guest from the host value. 2838 * This value is only used on POWER9. 2839 * On POWER9, we want to virtualize the doorbell facility, so we 2840 * don't set the HFSCR_MSGP bit, and that causes those instructions 2841 * to trap and then we emulate them. 2842 */ 2843 vcpu->arch.hfscr = HFSCR_TAR | HFSCR_EBB | HFSCR_PM | HFSCR_BHRB | 2844 HFSCR_DSCR | HFSCR_VECVSX | HFSCR_FP; 2845 if (cpu_has_feature(CPU_FTR_HVMODE)) { 2846 vcpu->arch.hfscr &= mfspr(SPRN_HFSCR); 2847 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 2848 if (cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) 2849 vcpu->arch.hfscr |= HFSCR_TM; 2850 #endif 2851 } 2852 if (cpu_has_feature(CPU_FTR_TM_COMP)) 2853 vcpu->arch.hfscr |= HFSCR_TM; 2854 2855 vcpu->arch.hfscr_permitted = vcpu->arch.hfscr; 2856 2857 /* 2858 * PM, EBB, TM are demand-faulted so start with it clear. 2859 */ 2860 vcpu->arch.hfscr &= ~(HFSCR_PM | HFSCR_EBB | HFSCR_TM); 2861 2862 kvmppc_mmu_book3s_hv_init(vcpu); 2863 2864 vcpu->arch.state = KVMPPC_VCPU_NOTREADY; 2865 2866 init_waitqueue_head(&vcpu->arch.cpu_run); 2867 2868 mutex_lock(&kvm->lock); 2869 vcore = NULL; 2870 err = -EINVAL; 2871 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 2872 if (id >= (KVM_MAX_VCPUS * kvm->arch.emul_smt_mode)) { 2873 pr_devel("KVM: VCPU ID too high\n"); 2874 core = KVM_MAX_VCORES; 2875 } else { 2876 BUG_ON(kvm->arch.smt_mode != 1); 2877 core = kvmppc_pack_vcpu_id(kvm, id); 2878 } 2879 } else { 2880 core = id / kvm->arch.smt_mode; 2881 } 2882 if (core < KVM_MAX_VCORES) { 2883 vcore = kvm->arch.vcores[core]; 2884 if (vcore && cpu_has_feature(CPU_FTR_ARCH_300)) { 2885 pr_devel("KVM: collision on id %u", id); 2886 vcore = NULL; 2887 } else if (!vcore) { 2888 /* 2889 * Take mmu_setup_lock for mutual exclusion 2890 * with kvmppc_update_lpcr(). 2891 */ 2892 err = -ENOMEM; 2893 vcore = kvmppc_vcore_create(kvm, 2894 id & ~(kvm->arch.smt_mode - 1)); 2895 mutex_lock(&kvm->arch.mmu_setup_lock); 2896 kvm->arch.vcores[core] = vcore; 2897 kvm->arch.online_vcores++; 2898 mutex_unlock(&kvm->arch.mmu_setup_lock); 2899 } 2900 } 2901 mutex_unlock(&kvm->lock); 2902 2903 if (!vcore) 2904 return err; 2905 2906 spin_lock(&vcore->lock); 2907 ++vcore->num_threads; 2908 spin_unlock(&vcore->lock); 2909 vcpu->arch.vcore = vcore; 2910 vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid; 2911 vcpu->arch.thread_cpu = -1; 2912 vcpu->arch.prev_cpu = -1; 2913 2914 vcpu->arch.cpu_type = KVM_CPU_3S_64; 2915 kvmppc_sanity_check(vcpu); 2916 2917 return 0; 2918 } 2919 2920 static int kvmhv_set_smt_mode(struct kvm *kvm, unsigned long smt_mode, 2921 unsigned long flags) 2922 { 2923 int err; 2924 int esmt = 0; 2925 2926 if (flags) 2927 return -EINVAL; 2928 if (smt_mode > MAX_SMT_THREADS || !is_power_of_2(smt_mode)) 2929 return -EINVAL; 2930 if (!cpu_has_feature(CPU_FTR_ARCH_300)) { 2931 /* 2932 * On POWER8 (or POWER7), the threading mode is "strict", 2933 * so we pack smt_mode vcpus per vcore. 2934 */ 2935 if (smt_mode > threads_per_subcore) 2936 return -EINVAL; 2937 } else { 2938 /* 2939 * On POWER9, the threading mode is "loose", 2940 * so each vcpu gets its own vcore. 2941 */ 2942 esmt = smt_mode; 2943 smt_mode = 1; 2944 } 2945 mutex_lock(&kvm->lock); 2946 err = -EBUSY; 2947 if (!kvm->arch.online_vcores) { 2948 kvm->arch.smt_mode = smt_mode; 2949 kvm->arch.emul_smt_mode = esmt; 2950 err = 0; 2951 } 2952 mutex_unlock(&kvm->lock); 2953 2954 return err; 2955 } 2956 2957 static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa) 2958 { 2959 if (vpa->pinned_addr) 2960 kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa, 2961 vpa->dirty); 2962 } 2963 2964 static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu) 2965 { 2966 spin_lock(&vcpu->arch.vpa_update_lock); 2967 unpin_vpa(vcpu->kvm, &vcpu->arch.dtl); 2968 unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow); 2969 unpin_vpa(vcpu->kvm, &vcpu->arch.vpa); 2970 spin_unlock(&vcpu->arch.vpa_update_lock); 2971 } 2972 2973 static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu) 2974 { 2975 /* Indicate we want to get back into the guest */ 2976 return 1; 2977 } 2978 2979 static void kvmppc_set_timer(struct kvm_vcpu *vcpu) 2980 { 2981 unsigned long dec_nsec, now; 2982 2983 now = get_tb(); 2984 if (now > kvmppc_dec_expires_host_tb(vcpu)) { 2985 /* decrementer has already gone negative */ 2986 kvmppc_core_queue_dec(vcpu); 2987 kvmppc_core_prepare_to_enter(vcpu); 2988 return; 2989 } 2990 dec_nsec = tb_to_ns(kvmppc_dec_expires_host_tb(vcpu) - now); 2991 hrtimer_start(&vcpu->arch.dec_timer, dec_nsec, HRTIMER_MODE_REL); 2992 vcpu->arch.timer_running = 1; 2993 } 2994 2995 extern int __kvmppc_vcore_entry(void); 2996 2997 static void kvmppc_remove_runnable(struct kvmppc_vcore *vc, 2998 struct kvm_vcpu *vcpu, u64 tb) 2999 { 3000 u64 now; 3001 3002 if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE) 3003 return; 3004 spin_lock_irq(&vcpu->arch.tbacct_lock); 3005 now = tb; 3006 vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) - 3007 vcpu->arch.stolen_logged; 3008 vcpu->arch.busy_preempt = now; 3009 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; 3010 spin_unlock_irq(&vcpu->arch.tbacct_lock); 3011 --vc->n_runnable; 3012 WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], NULL); 3013 } 3014 3015 static int kvmppc_grab_hwthread(int cpu) 3016 { 3017 struct paca_struct *tpaca; 3018 long timeout = 10000; 3019 3020 tpaca = paca_ptrs[cpu]; 3021 3022 /* Ensure the thread won't go into the kernel if it wakes */ 3023 tpaca->kvm_hstate.kvm_vcpu = NULL; 3024 tpaca->kvm_hstate.kvm_vcore = NULL; 3025 tpaca->kvm_hstate.napping = 0; 3026 smp_wmb(); 3027 tpaca->kvm_hstate.hwthread_req = 1; 3028 3029 /* 3030 * If the thread is already executing in the kernel (e.g. handling 3031 * a stray interrupt), wait for it to get back to nap mode. 3032 * The smp_mb() is to ensure that our setting of hwthread_req 3033 * is visible before we look at hwthread_state, so if this 3034 * races with the code at system_reset_pSeries and the thread 3035 * misses our setting of hwthread_req, we are sure to see its 3036 * setting of hwthread_state, and vice versa. 3037 */ 3038 smp_mb(); 3039 while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) { 3040 if (--timeout <= 0) { 3041 pr_err("KVM: couldn't grab cpu %d\n", cpu); 3042 return -EBUSY; 3043 } 3044 udelay(1); 3045 } 3046 return 0; 3047 } 3048 3049 static void kvmppc_release_hwthread(int cpu) 3050 { 3051 struct paca_struct *tpaca; 3052 3053 tpaca = paca_ptrs[cpu]; 3054 tpaca->kvm_hstate.hwthread_req = 0; 3055 tpaca->kvm_hstate.kvm_vcpu = NULL; 3056 tpaca->kvm_hstate.kvm_vcore = NULL; 3057 tpaca->kvm_hstate.kvm_split_mode = NULL; 3058 } 3059 3060 static DEFINE_PER_CPU(struct kvm *, cpu_in_guest); 3061 3062 static void radix_flush_cpu(struct kvm *kvm, int cpu, struct kvm_vcpu *vcpu) 3063 { 3064 struct kvm_nested_guest *nested = vcpu->arch.nested; 3065 cpumask_t *need_tlb_flush; 3066 int i; 3067 3068 if (nested) 3069 need_tlb_flush = &nested->need_tlb_flush; 3070 else 3071 need_tlb_flush = &kvm->arch.need_tlb_flush; 3072 3073 cpu = cpu_first_tlb_thread_sibling(cpu); 3074 for (i = cpu; i <= cpu_last_tlb_thread_sibling(cpu); 3075 i += cpu_tlb_thread_sibling_step()) 3076 cpumask_set_cpu(i, need_tlb_flush); 3077 3078 /* 3079 * Make sure setting of bit in need_tlb_flush precedes testing of 3080 * cpu_in_guest. The matching barrier on the other side is hwsync 3081 * when switching to guest MMU mode, which happens between 3082 * cpu_in_guest being set to the guest kvm, and need_tlb_flush bit 3083 * being tested. 3084 */ 3085 smp_mb(); 3086 3087 for (i = cpu; i <= cpu_last_tlb_thread_sibling(cpu); 3088 i += cpu_tlb_thread_sibling_step()) { 3089 struct kvm *running = *per_cpu_ptr(&cpu_in_guest, i); 3090 3091 if (running == kvm) 3092 smp_call_function_single(i, do_nothing, NULL, 1); 3093 } 3094 } 3095 3096 static void do_migrate_away_vcpu(void *arg) 3097 { 3098 struct kvm_vcpu *vcpu = arg; 3099 struct kvm *kvm = vcpu->kvm; 3100 3101 /* 3102 * If the guest has GTSE, it may execute tlbie, so do a eieio; tlbsync; 3103 * ptesync sequence on the old CPU before migrating to a new one, in 3104 * case we interrupted the guest between a tlbie ; eieio ; 3105 * tlbsync; ptesync sequence. 3106 * 3107 * Otherwise, ptesync is sufficient for ordering tlbiel sequences. 3108 */ 3109 if (kvm->arch.lpcr & LPCR_GTSE) 3110 asm volatile("eieio; tlbsync; ptesync"); 3111 else 3112 asm volatile("ptesync"); 3113 } 3114 3115 static void kvmppc_prepare_radix_vcpu(struct kvm_vcpu *vcpu, int pcpu) 3116 { 3117 struct kvm_nested_guest *nested = vcpu->arch.nested; 3118 struct kvm *kvm = vcpu->kvm; 3119 int prev_cpu; 3120 3121 if (!cpu_has_feature(CPU_FTR_HVMODE)) 3122 return; 3123 3124 if (nested) 3125 prev_cpu = nested->prev_cpu[vcpu->arch.nested_vcpu_id]; 3126 else 3127 prev_cpu = vcpu->arch.prev_cpu; 3128 3129 /* 3130 * With radix, the guest can do TLB invalidations itself, 3131 * and it could choose to use the local form (tlbiel) if 3132 * it is invalidating a translation that has only ever been 3133 * used on one vcpu. However, that doesn't mean it has 3134 * only ever been used on one physical cpu, since vcpus 3135 * can move around between pcpus. To cope with this, when 3136 * a vcpu moves from one pcpu to another, we need to tell 3137 * any vcpus running on the same core as this vcpu previously 3138 * ran to flush the TLB. 3139 */ 3140 if (prev_cpu != pcpu) { 3141 if (prev_cpu >= 0) { 3142 if (cpu_first_tlb_thread_sibling(prev_cpu) != 3143 cpu_first_tlb_thread_sibling(pcpu)) 3144 radix_flush_cpu(kvm, prev_cpu, vcpu); 3145 3146 smp_call_function_single(prev_cpu, 3147 do_migrate_away_vcpu, vcpu, 1); 3148 } 3149 if (nested) 3150 nested->prev_cpu[vcpu->arch.nested_vcpu_id] = pcpu; 3151 else 3152 vcpu->arch.prev_cpu = pcpu; 3153 } 3154 } 3155 3156 static void kvmppc_start_thread(struct kvm_vcpu *vcpu, struct kvmppc_vcore *vc) 3157 { 3158 int cpu; 3159 struct paca_struct *tpaca; 3160 3161 cpu = vc->pcpu; 3162 if (vcpu) { 3163 if (vcpu->arch.timer_running) { 3164 hrtimer_try_to_cancel(&vcpu->arch.dec_timer); 3165 vcpu->arch.timer_running = 0; 3166 } 3167 cpu += vcpu->arch.ptid; 3168 vcpu->cpu = vc->pcpu; 3169 vcpu->arch.thread_cpu = cpu; 3170 } 3171 tpaca = paca_ptrs[cpu]; 3172 tpaca->kvm_hstate.kvm_vcpu = vcpu; 3173 tpaca->kvm_hstate.ptid = cpu - vc->pcpu; 3174 tpaca->kvm_hstate.fake_suspend = 0; 3175 /* Order stores to hstate.kvm_vcpu etc. before store to kvm_vcore */ 3176 smp_wmb(); 3177 tpaca->kvm_hstate.kvm_vcore = vc; 3178 if (cpu != smp_processor_id()) 3179 kvmppc_ipi_thread(cpu); 3180 } 3181 3182 static void kvmppc_wait_for_nap(int n_threads) 3183 { 3184 int cpu = smp_processor_id(); 3185 int i, loops; 3186 3187 if (n_threads <= 1) 3188 return; 3189 for (loops = 0; loops < 1000000; ++loops) { 3190 /* 3191 * Check if all threads are finished. 3192 * We set the vcore pointer when starting a thread 3193 * and the thread clears it when finished, so we look 3194 * for any threads that still have a non-NULL vcore ptr. 3195 */ 3196 for (i = 1; i < n_threads; ++i) 3197 if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore) 3198 break; 3199 if (i == n_threads) { 3200 HMT_medium(); 3201 return; 3202 } 3203 HMT_low(); 3204 } 3205 HMT_medium(); 3206 for (i = 1; i < n_threads; ++i) 3207 if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore) 3208 pr_err("KVM: CPU %d seems to be stuck\n", cpu + i); 3209 } 3210 3211 /* 3212 * Check that we are on thread 0 and that any other threads in 3213 * this core are off-line. Then grab the threads so they can't 3214 * enter the kernel. 3215 */ 3216 static int on_primary_thread(void) 3217 { 3218 int cpu = smp_processor_id(); 3219 int thr; 3220 3221 /* Are we on a primary subcore? */ 3222 if (cpu_thread_in_subcore(cpu)) 3223 return 0; 3224 3225 thr = 0; 3226 while (++thr < threads_per_subcore) 3227 if (cpu_online(cpu + thr)) 3228 return 0; 3229 3230 /* Grab all hw threads so they can't go into the kernel */ 3231 for (thr = 1; thr < threads_per_subcore; ++thr) { 3232 if (kvmppc_grab_hwthread(cpu + thr)) { 3233 /* Couldn't grab one; let the others go */ 3234 do { 3235 kvmppc_release_hwthread(cpu + thr); 3236 } while (--thr > 0); 3237 return 0; 3238 } 3239 } 3240 return 1; 3241 } 3242 3243 /* 3244 * A list of virtual cores for each physical CPU. 3245 * These are vcores that could run but their runner VCPU tasks are 3246 * (or may be) preempted. 3247 */ 3248 struct preempted_vcore_list { 3249 struct list_head list; 3250 spinlock_t lock; 3251 }; 3252 3253 static DEFINE_PER_CPU(struct preempted_vcore_list, preempted_vcores); 3254 3255 static void init_vcore_lists(void) 3256 { 3257 int cpu; 3258 3259 for_each_possible_cpu(cpu) { 3260 struct preempted_vcore_list *lp = &per_cpu(preempted_vcores, cpu); 3261 spin_lock_init(&lp->lock); 3262 INIT_LIST_HEAD(&lp->list); 3263 } 3264 } 3265 3266 static void kvmppc_vcore_preempt(struct kvmppc_vcore *vc) 3267 { 3268 struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores); 3269 3270 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); 3271 3272 vc->vcore_state = VCORE_PREEMPT; 3273 vc->pcpu = smp_processor_id(); 3274 if (vc->num_threads < threads_per_vcore(vc->kvm)) { 3275 spin_lock(&lp->lock); 3276 list_add_tail(&vc->preempt_list, &lp->list); 3277 spin_unlock(&lp->lock); 3278 } 3279 3280 /* Start accumulating stolen time */ 3281 kvmppc_core_start_stolen(vc, mftb()); 3282 } 3283 3284 static void kvmppc_vcore_end_preempt(struct kvmppc_vcore *vc) 3285 { 3286 struct preempted_vcore_list *lp; 3287 3288 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); 3289 3290 kvmppc_core_end_stolen(vc, mftb()); 3291 if (!list_empty(&vc->preempt_list)) { 3292 lp = &per_cpu(preempted_vcores, vc->pcpu); 3293 spin_lock(&lp->lock); 3294 list_del_init(&vc->preempt_list); 3295 spin_unlock(&lp->lock); 3296 } 3297 vc->vcore_state = VCORE_INACTIVE; 3298 } 3299 3300 /* 3301 * This stores information about the virtual cores currently 3302 * assigned to a physical core. 3303 */ 3304 struct core_info { 3305 int n_subcores; 3306 int max_subcore_threads; 3307 int total_threads; 3308 int subcore_threads[MAX_SUBCORES]; 3309 struct kvmppc_vcore *vc[MAX_SUBCORES]; 3310 }; 3311 3312 /* 3313 * This mapping means subcores 0 and 1 can use threads 0-3 and 4-7 3314 * respectively in 2-way micro-threading (split-core) mode on POWER8. 3315 */ 3316 static int subcore_thread_map[MAX_SUBCORES] = { 0, 4, 2, 6 }; 3317 3318 static void init_core_info(struct core_info *cip, struct kvmppc_vcore *vc) 3319 { 3320 memset(cip, 0, sizeof(*cip)); 3321 cip->n_subcores = 1; 3322 cip->max_subcore_threads = vc->num_threads; 3323 cip->total_threads = vc->num_threads; 3324 cip->subcore_threads[0] = vc->num_threads; 3325 cip->vc[0] = vc; 3326 } 3327 3328 static bool subcore_config_ok(int n_subcores, int n_threads) 3329 { 3330 /* 3331 * POWER9 "SMT4" cores are permanently in what is effectively a 4-way 3332 * split-core mode, with one thread per subcore. 3333 */ 3334 if (cpu_has_feature(CPU_FTR_ARCH_300)) 3335 return n_subcores <= 4 && n_threads == 1; 3336 3337 /* On POWER8, can only dynamically split if unsplit to begin with */ 3338 if (n_subcores > 1 && threads_per_subcore < MAX_SMT_THREADS) 3339 return false; 3340 if (n_subcores > MAX_SUBCORES) 3341 return false; 3342 if (n_subcores > 1) { 3343 if (!(dynamic_mt_modes & 2)) 3344 n_subcores = 4; 3345 if (n_subcores > 2 && !(dynamic_mt_modes & 4)) 3346 return false; 3347 } 3348 3349 return n_subcores * roundup_pow_of_two(n_threads) <= MAX_SMT_THREADS; 3350 } 3351 3352 static void init_vcore_to_run(struct kvmppc_vcore *vc) 3353 { 3354 vc->entry_exit_map = 0; 3355 vc->in_guest = 0; 3356 vc->napping_threads = 0; 3357 vc->conferring_threads = 0; 3358 vc->tb_offset_applied = 0; 3359 } 3360 3361 static bool can_dynamic_split(struct kvmppc_vcore *vc, struct core_info *cip) 3362 { 3363 int n_threads = vc->num_threads; 3364 int sub; 3365 3366 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) 3367 return false; 3368 3369 /* In one_vm_per_core mode, require all vcores to be from the same vm */ 3370 if (one_vm_per_core && vc->kvm != cip->vc[0]->kvm) 3371 return false; 3372 3373 if (n_threads < cip->max_subcore_threads) 3374 n_threads = cip->max_subcore_threads; 3375 if (!subcore_config_ok(cip->n_subcores + 1, n_threads)) 3376 return false; 3377 cip->max_subcore_threads = n_threads; 3378 3379 sub = cip->n_subcores; 3380 ++cip->n_subcores; 3381 cip->total_threads += vc->num_threads; 3382 cip->subcore_threads[sub] = vc->num_threads; 3383 cip->vc[sub] = vc; 3384 init_vcore_to_run(vc); 3385 list_del_init(&vc->preempt_list); 3386 3387 return true; 3388 } 3389 3390 /* 3391 * Work out whether it is possible to piggyback the execution of 3392 * vcore *pvc onto the execution of the other vcores described in *cip. 3393 */ 3394 static bool can_piggyback(struct kvmppc_vcore *pvc, struct core_info *cip, 3395 int target_threads) 3396 { 3397 if (cip->total_threads + pvc->num_threads > target_threads) 3398 return false; 3399 3400 return can_dynamic_split(pvc, cip); 3401 } 3402 3403 static void prepare_threads(struct kvmppc_vcore *vc) 3404 { 3405 int i; 3406 struct kvm_vcpu *vcpu; 3407 3408 for_each_runnable_thread(i, vcpu, vc) { 3409 if (signal_pending(vcpu->arch.run_task)) 3410 vcpu->arch.ret = -EINTR; 3411 else if (vcpu->arch.vpa.update_pending || 3412 vcpu->arch.slb_shadow.update_pending || 3413 vcpu->arch.dtl.update_pending) 3414 vcpu->arch.ret = RESUME_GUEST; 3415 else 3416 continue; 3417 kvmppc_remove_runnable(vc, vcpu, mftb()); 3418 wake_up(&vcpu->arch.cpu_run); 3419 } 3420 } 3421 3422 static void collect_piggybacks(struct core_info *cip, int target_threads) 3423 { 3424 struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores); 3425 struct kvmppc_vcore *pvc, *vcnext; 3426 3427 spin_lock(&lp->lock); 3428 list_for_each_entry_safe(pvc, vcnext, &lp->list, preempt_list) { 3429 if (!spin_trylock(&pvc->lock)) 3430 continue; 3431 prepare_threads(pvc); 3432 if (!pvc->n_runnable || !pvc->kvm->arch.mmu_ready) { 3433 list_del_init(&pvc->preempt_list); 3434 if (pvc->runner == NULL) { 3435 pvc->vcore_state = VCORE_INACTIVE; 3436 kvmppc_core_end_stolen(pvc, mftb()); 3437 } 3438 spin_unlock(&pvc->lock); 3439 continue; 3440 } 3441 if (!can_piggyback(pvc, cip, target_threads)) { 3442 spin_unlock(&pvc->lock); 3443 continue; 3444 } 3445 kvmppc_core_end_stolen(pvc, mftb()); 3446 pvc->vcore_state = VCORE_PIGGYBACK; 3447 if (cip->total_threads >= target_threads) 3448 break; 3449 } 3450 spin_unlock(&lp->lock); 3451 } 3452 3453 static bool recheck_signals_and_mmu(struct core_info *cip) 3454 { 3455 int sub, i; 3456 struct kvm_vcpu *vcpu; 3457 struct kvmppc_vcore *vc; 3458 3459 for (sub = 0; sub < cip->n_subcores; ++sub) { 3460 vc = cip->vc[sub]; 3461 if (!vc->kvm->arch.mmu_ready) 3462 return true; 3463 for_each_runnable_thread(i, vcpu, vc) 3464 if (signal_pending(vcpu->arch.run_task)) 3465 return true; 3466 } 3467 return false; 3468 } 3469 3470 static void post_guest_process(struct kvmppc_vcore *vc, bool is_master) 3471 { 3472 int still_running = 0, i; 3473 u64 now; 3474 long ret; 3475 struct kvm_vcpu *vcpu; 3476 3477 spin_lock(&vc->lock); 3478 now = get_tb(); 3479 for_each_runnable_thread(i, vcpu, vc) { 3480 /* 3481 * It's safe to unlock the vcore in the loop here, because 3482 * for_each_runnable_thread() is safe against removal of 3483 * the vcpu, and the vcore state is VCORE_EXITING here, 3484 * so any vcpus becoming runnable will have their arch.trap 3485 * set to zero and can't actually run in the guest. 3486 */ 3487 spin_unlock(&vc->lock); 3488 /* cancel pending dec exception if dec is positive */ 3489 if (now < kvmppc_dec_expires_host_tb(vcpu) && 3490 kvmppc_core_pending_dec(vcpu)) 3491 kvmppc_core_dequeue_dec(vcpu); 3492 3493 trace_kvm_guest_exit(vcpu); 3494 3495 ret = RESUME_GUEST; 3496 if (vcpu->arch.trap) 3497 ret = kvmppc_handle_exit_hv(vcpu, 3498 vcpu->arch.run_task); 3499 3500 vcpu->arch.ret = ret; 3501 vcpu->arch.trap = 0; 3502 3503 spin_lock(&vc->lock); 3504 if (is_kvmppc_resume_guest(vcpu->arch.ret)) { 3505 if (vcpu->arch.pending_exceptions) 3506 kvmppc_core_prepare_to_enter(vcpu); 3507 if (vcpu->arch.ceded) 3508 kvmppc_set_timer(vcpu); 3509 else 3510 ++still_running; 3511 } else { 3512 kvmppc_remove_runnable(vc, vcpu, mftb()); 3513 wake_up(&vcpu->arch.cpu_run); 3514 } 3515 } 3516 if (!is_master) { 3517 if (still_running > 0) { 3518 kvmppc_vcore_preempt(vc); 3519 } else if (vc->runner) { 3520 vc->vcore_state = VCORE_PREEMPT; 3521 kvmppc_core_start_stolen(vc, mftb()); 3522 } else { 3523 vc->vcore_state = VCORE_INACTIVE; 3524 } 3525 if (vc->n_runnable > 0 && vc->runner == NULL) { 3526 /* make sure there's a candidate runner awake */ 3527 i = -1; 3528 vcpu = next_runnable_thread(vc, &i); 3529 wake_up(&vcpu->arch.cpu_run); 3530 } 3531 } 3532 spin_unlock(&vc->lock); 3533 } 3534 3535 /* 3536 * Clear core from the list of active host cores as we are about to 3537 * enter the guest. Only do this if it is the primary thread of the 3538 * core (not if a subcore) that is entering the guest. 3539 */ 3540 static inline int kvmppc_clear_host_core(unsigned int cpu) 3541 { 3542 int core; 3543 3544 if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu)) 3545 return 0; 3546 /* 3547 * Memory barrier can be omitted here as we will do a smp_wmb() 3548 * later in kvmppc_start_thread and we need ensure that state is 3549 * visible to other CPUs only after we enter guest. 3550 */ 3551 core = cpu >> threads_shift; 3552 kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 0; 3553 return 0; 3554 } 3555 3556 /* 3557 * Advertise this core as an active host core since we exited the guest 3558 * Only need to do this if it is the primary thread of the core that is 3559 * exiting. 3560 */ 3561 static inline int kvmppc_set_host_core(unsigned int cpu) 3562 { 3563 int core; 3564 3565 if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu)) 3566 return 0; 3567 3568 /* 3569 * Memory barrier can be omitted here because we do a spin_unlock 3570 * immediately after this which provides the memory barrier. 3571 */ 3572 core = cpu >> threads_shift; 3573 kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 1; 3574 return 0; 3575 } 3576 3577 static void set_irq_happened(int trap) 3578 { 3579 switch (trap) { 3580 case BOOK3S_INTERRUPT_EXTERNAL: 3581 local_paca->irq_happened |= PACA_IRQ_EE; 3582 break; 3583 case BOOK3S_INTERRUPT_H_DOORBELL: 3584 local_paca->irq_happened |= PACA_IRQ_DBELL; 3585 break; 3586 case BOOK3S_INTERRUPT_HMI: 3587 local_paca->irq_happened |= PACA_IRQ_HMI; 3588 break; 3589 case BOOK3S_INTERRUPT_SYSTEM_RESET: 3590 replay_system_reset(); 3591 break; 3592 } 3593 } 3594 3595 /* 3596 * Run a set of guest threads on a physical core. 3597 * Called with vc->lock held. 3598 */ 3599 static noinline void kvmppc_run_core(struct kvmppc_vcore *vc) 3600 { 3601 struct kvm_vcpu *vcpu; 3602 int i; 3603 int srcu_idx; 3604 struct core_info core_info; 3605 struct kvmppc_vcore *pvc; 3606 struct kvm_split_mode split_info, *sip; 3607 int split, subcore_size, active; 3608 int sub; 3609 bool thr0_done; 3610 unsigned long cmd_bit, stat_bit; 3611 int pcpu, thr; 3612 int target_threads; 3613 int controlled_threads; 3614 int trap; 3615 bool is_power8; 3616 3617 if (WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300))) 3618 return; 3619 3620 /* 3621 * Remove from the list any threads that have a signal pending 3622 * or need a VPA update done 3623 */ 3624 prepare_threads(vc); 3625 3626 /* if the runner is no longer runnable, let the caller pick a new one */ 3627 if (vc->runner->arch.state != KVMPPC_VCPU_RUNNABLE) 3628 return; 3629 3630 /* 3631 * Initialize *vc. 3632 */ 3633 init_vcore_to_run(vc); 3634 vc->preempt_tb = TB_NIL; 3635 3636 /* 3637 * Number of threads that we will be controlling: the same as 3638 * the number of threads per subcore, except on POWER9, 3639 * where it's 1 because the threads are (mostly) independent. 3640 */ 3641 controlled_threads = threads_per_vcore(vc->kvm); 3642 3643 /* 3644 * Make sure we are running on primary threads, and that secondary 3645 * threads are offline. Also check if the number of threads in this 3646 * guest are greater than the current system threads per guest. 3647 */ 3648 if ((controlled_threads > 1) && 3649 ((vc->num_threads > threads_per_subcore) || !on_primary_thread())) { 3650 for_each_runnable_thread(i, vcpu, vc) { 3651 vcpu->arch.ret = -EBUSY; 3652 kvmppc_remove_runnable(vc, vcpu, mftb()); 3653 wake_up(&vcpu->arch.cpu_run); 3654 } 3655 goto out; 3656 } 3657 3658 /* 3659 * See if we could run any other vcores on the physical core 3660 * along with this one. 3661 */ 3662 init_core_info(&core_info, vc); 3663 pcpu = smp_processor_id(); 3664 target_threads = controlled_threads; 3665 if (target_smt_mode && target_smt_mode < target_threads) 3666 target_threads = target_smt_mode; 3667 if (vc->num_threads < target_threads) 3668 collect_piggybacks(&core_info, target_threads); 3669 3670 /* 3671 * Hard-disable interrupts, and check resched flag and signals. 3672 * If we need to reschedule or deliver a signal, clean up 3673 * and return without going into the guest(s). 3674 * If the mmu_ready flag has been cleared, don't go into the 3675 * guest because that means a HPT resize operation is in progress. 3676 */ 3677 local_irq_disable(); 3678 hard_irq_disable(); 3679 if (lazy_irq_pending() || need_resched() || 3680 recheck_signals_and_mmu(&core_info)) { 3681 local_irq_enable(); 3682 vc->vcore_state = VCORE_INACTIVE; 3683 /* Unlock all except the primary vcore */ 3684 for (sub = 1; sub < core_info.n_subcores; ++sub) { 3685 pvc = core_info.vc[sub]; 3686 /* Put back on to the preempted vcores list */ 3687 kvmppc_vcore_preempt(pvc); 3688 spin_unlock(&pvc->lock); 3689 } 3690 for (i = 0; i < controlled_threads; ++i) 3691 kvmppc_release_hwthread(pcpu + i); 3692 return; 3693 } 3694 3695 kvmppc_clear_host_core(pcpu); 3696 3697 /* Decide on micro-threading (split-core) mode */ 3698 subcore_size = threads_per_subcore; 3699 cmd_bit = stat_bit = 0; 3700 split = core_info.n_subcores; 3701 sip = NULL; 3702 is_power8 = cpu_has_feature(CPU_FTR_ARCH_207S); 3703 3704 if (split > 1) { 3705 sip = &split_info; 3706 memset(&split_info, 0, sizeof(split_info)); 3707 for (sub = 0; sub < core_info.n_subcores; ++sub) 3708 split_info.vc[sub] = core_info.vc[sub]; 3709 3710 if (is_power8) { 3711 if (split == 2 && (dynamic_mt_modes & 2)) { 3712 cmd_bit = HID0_POWER8_1TO2LPAR; 3713 stat_bit = HID0_POWER8_2LPARMODE; 3714 } else { 3715 split = 4; 3716 cmd_bit = HID0_POWER8_1TO4LPAR; 3717 stat_bit = HID0_POWER8_4LPARMODE; 3718 } 3719 subcore_size = MAX_SMT_THREADS / split; 3720 split_info.rpr = mfspr(SPRN_RPR); 3721 split_info.pmmar = mfspr(SPRN_PMMAR); 3722 split_info.ldbar = mfspr(SPRN_LDBAR); 3723 split_info.subcore_size = subcore_size; 3724 } else { 3725 split_info.subcore_size = 1; 3726 } 3727 3728 /* order writes to split_info before kvm_split_mode pointer */ 3729 smp_wmb(); 3730 } 3731 3732 for (thr = 0; thr < controlled_threads; ++thr) { 3733 struct paca_struct *paca = paca_ptrs[pcpu + thr]; 3734 3735 paca->kvm_hstate.napping = 0; 3736 paca->kvm_hstate.kvm_split_mode = sip; 3737 } 3738 3739 /* Initiate micro-threading (split-core) on POWER8 if required */ 3740 if (cmd_bit) { 3741 unsigned long hid0 = mfspr(SPRN_HID0); 3742 3743 hid0 |= cmd_bit | HID0_POWER8_DYNLPARDIS; 3744 mb(); 3745 mtspr(SPRN_HID0, hid0); 3746 isync(); 3747 for (;;) { 3748 hid0 = mfspr(SPRN_HID0); 3749 if (hid0 & stat_bit) 3750 break; 3751 cpu_relax(); 3752 } 3753 } 3754 3755 /* 3756 * On POWER8, set RWMR register. 3757 * Since it only affects PURR and SPURR, it doesn't affect 3758 * the host, so we don't save/restore the host value. 3759 */ 3760 if (is_power8) { 3761 unsigned long rwmr_val = RWMR_RPA_P8_8THREAD; 3762 int n_online = atomic_read(&vc->online_count); 3763 3764 /* 3765 * Use the 8-thread value if we're doing split-core 3766 * or if the vcore's online count looks bogus. 3767 */ 3768 if (split == 1 && threads_per_subcore == MAX_SMT_THREADS && 3769 n_online >= 1 && n_online <= MAX_SMT_THREADS) 3770 rwmr_val = p8_rwmr_values[n_online]; 3771 mtspr(SPRN_RWMR, rwmr_val); 3772 } 3773 3774 /* Start all the threads */ 3775 active = 0; 3776 for (sub = 0; sub < core_info.n_subcores; ++sub) { 3777 thr = is_power8 ? subcore_thread_map[sub] : sub; 3778 thr0_done = false; 3779 active |= 1 << thr; 3780 pvc = core_info.vc[sub]; 3781 pvc->pcpu = pcpu + thr; 3782 for_each_runnable_thread(i, vcpu, pvc) { 3783 /* 3784 * XXX: is kvmppc_start_thread called too late here? 3785 * It updates vcpu->cpu and vcpu->arch.thread_cpu 3786 * which are used by kvmppc_fast_vcpu_kick_hv(), but 3787 * kick is called after new exceptions become available 3788 * and exceptions are checked earlier than here, by 3789 * kvmppc_core_prepare_to_enter. 3790 */ 3791 kvmppc_start_thread(vcpu, pvc); 3792 kvmppc_create_dtl_entry(vcpu, pvc); 3793 trace_kvm_guest_enter(vcpu); 3794 if (!vcpu->arch.ptid) 3795 thr0_done = true; 3796 active |= 1 << (thr + vcpu->arch.ptid); 3797 } 3798 /* 3799 * We need to start the first thread of each subcore 3800 * even if it doesn't have a vcpu. 3801 */ 3802 if (!thr0_done) 3803 kvmppc_start_thread(NULL, pvc); 3804 } 3805 3806 /* 3807 * Ensure that split_info.do_nap is set after setting 3808 * the vcore pointer in the PACA of the secondaries. 3809 */ 3810 smp_mb(); 3811 3812 /* 3813 * When doing micro-threading, poke the inactive threads as well. 3814 * This gets them to the nap instruction after kvm_do_nap, 3815 * which reduces the time taken to unsplit later. 3816 */ 3817 if (cmd_bit) { 3818 split_info.do_nap = 1; /* ask secondaries to nap when done */ 3819 for (thr = 1; thr < threads_per_subcore; ++thr) 3820 if (!(active & (1 << thr))) 3821 kvmppc_ipi_thread(pcpu + thr); 3822 } 3823 3824 vc->vcore_state = VCORE_RUNNING; 3825 preempt_disable(); 3826 3827 trace_kvmppc_run_core(vc, 0); 3828 3829 for (sub = 0; sub < core_info.n_subcores; ++sub) 3830 spin_unlock(&core_info.vc[sub]->lock); 3831 3832 guest_enter_irqoff(); 3833 3834 srcu_idx = srcu_read_lock(&vc->kvm->srcu); 3835 3836 this_cpu_disable_ftrace(); 3837 3838 /* 3839 * Interrupts will be enabled once we get into the guest, 3840 * so tell lockdep that we're about to enable interrupts. 3841 */ 3842 trace_hardirqs_on(); 3843 3844 trap = __kvmppc_vcore_entry(); 3845 3846 trace_hardirqs_off(); 3847 3848 this_cpu_enable_ftrace(); 3849 3850 srcu_read_unlock(&vc->kvm->srcu, srcu_idx); 3851 3852 set_irq_happened(trap); 3853 3854 spin_lock(&vc->lock); 3855 /* prevent other vcpu threads from doing kvmppc_start_thread() now */ 3856 vc->vcore_state = VCORE_EXITING; 3857 3858 /* wait for secondary threads to finish writing their state to memory */ 3859 kvmppc_wait_for_nap(controlled_threads); 3860 3861 /* Return to whole-core mode if we split the core earlier */ 3862 if (cmd_bit) { 3863 unsigned long hid0 = mfspr(SPRN_HID0); 3864 unsigned long loops = 0; 3865 3866 hid0 &= ~HID0_POWER8_DYNLPARDIS; 3867 stat_bit = HID0_POWER8_2LPARMODE | HID0_POWER8_4LPARMODE; 3868 mb(); 3869 mtspr(SPRN_HID0, hid0); 3870 isync(); 3871 for (;;) { 3872 hid0 = mfspr(SPRN_HID0); 3873 if (!(hid0 & stat_bit)) 3874 break; 3875 cpu_relax(); 3876 ++loops; 3877 } 3878 split_info.do_nap = 0; 3879 } 3880 3881 kvmppc_set_host_core(pcpu); 3882 3883 context_tracking_guest_exit(); 3884 if (!vtime_accounting_enabled_this_cpu()) { 3885 local_irq_enable(); 3886 /* 3887 * Service IRQs here before vtime_account_guest_exit() so any 3888 * ticks that occurred while running the guest are accounted to 3889 * the guest. If vtime accounting is enabled, accounting uses 3890 * TB rather than ticks, so it can be done without enabling 3891 * interrupts here, which has the problem that it accounts 3892 * interrupt processing overhead to the host. 3893 */ 3894 local_irq_disable(); 3895 } 3896 vtime_account_guest_exit(); 3897 3898 local_irq_enable(); 3899 3900 /* Let secondaries go back to the offline loop */ 3901 for (i = 0; i < controlled_threads; ++i) { 3902 kvmppc_release_hwthread(pcpu + i); 3903 if (sip && sip->napped[i]) 3904 kvmppc_ipi_thread(pcpu + i); 3905 } 3906 3907 spin_unlock(&vc->lock); 3908 3909 /* make sure updates to secondary vcpu structs are visible now */ 3910 smp_mb(); 3911 3912 preempt_enable(); 3913 3914 for (sub = 0; sub < core_info.n_subcores; ++sub) { 3915 pvc = core_info.vc[sub]; 3916 post_guest_process(pvc, pvc == vc); 3917 } 3918 3919 spin_lock(&vc->lock); 3920 3921 out: 3922 vc->vcore_state = VCORE_INACTIVE; 3923 trace_kvmppc_run_core(vc, 1); 3924 } 3925 3926 static inline bool hcall_is_xics(unsigned long req) 3927 { 3928 return req == H_EOI || req == H_CPPR || req == H_IPI || 3929 req == H_IPOLL || req == H_XIRR || req == H_XIRR_X; 3930 } 3931 3932 static void vcpu_vpa_increment_dispatch(struct kvm_vcpu *vcpu) 3933 { 3934 struct lppaca *lp = vcpu->arch.vpa.pinned_addr; 3935 if (lp) { 3936 u32 yield_count = be32_to_cpu(lp->yield_count) + 1; 3937 lp->yield_count = cpu_to_be32(yield_count); 3938 vcpu->arch.vpa.dirty = 1; 3939 } 3940 } 3941 3942 /* call our hypervisor to load up HV regs and go */ 3943 static int kvmhv_vcpu_entry_p9_nested(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpcr, u64 *tb) 3944 { 3945 struct kvmppc_vcore *vc = vcpu->arch.vcore; 3946 unsigned long host_psscr; 3947 unsigned long msr; 3948 struct hv_guest_state hvregs; 3949 struct p9_host_os_sprs host_os_sprs; 3950 s64 dec; 3951 int trap; 3952 3953 msr = mfmsr(); 3954 3955 save_p9_host_os_sprs(&host_os_sprs); 3956 3957 /* 3958 * We need to save and restore the guest visible part of the 3959 * psscr (i.e. using SPRN_PSSCR_PR) since the hypervisor 3960 * doesn't do this for us. Note only required if pseries since 3961 * this is done in kvmhv_vcpu_entry_p9() below otherwise. 3962 */ 3963 host_psscr = mfspr(SPRN_PSSCR_PR); 3964 3965 kvmppc_msr_hard_disable_set_facilities(vcpu, msr); 3966 if (lazy_irq_pending()) 3967 return 0; 3968 3969 if (unlikely(load_vcpu_state(vcpu, &host_os_sprs))) 3970 msr = mfmsr(); /* TM restore can update msr */ 3971 3972 if (vcpu->arch.psscr != host_psscr) 3973 mtspr(SPRN_PSSCR_PR, vcpu->arch.psscr); 3974 3975 kvmhv_save_hv_regs(vcpu, &hvregs); 3976 hvregs.lpcr = lpcr; 3977 hvregs.amor = ~0; 3978 vcpu->arch.regs.msr = vcpu->arch.shregs.msr; 3979 hvregs.version = HV_GUEST_STATE_VERSION; 3980 if (vcpu->arch.nested) { 3981 hvregs.lpid = vcpu->arch.nested->shadow_lpid; 3982 hvregs.vcpu_token = vcpu->arch.nested_vcpu_id; 3983 } else { 3984 hvregs.lpid = vcpu->kvm->arch.lpid; 3985 hvregs.vcpu_token = vcpu->vcpu_id; 3986 } 3987 hvregs.hdec_expiry = time_limit; 3988 3989 /* 3990 * When setting DEC, we must always deal with irq_work_raise 3991 * via NMI vs setting DEC. The problem occurs right as we 3992 * switch into guest mode if a NMI hits and sets pending work 3993 * and sets DEC, then that will apply to the guest and not 3994 * bring us back to the host. 3995 * 3996 * irq_work_raise could check a flag (or possibly LPCR[HDICE] 3997 * for example) and set HDEC to 1? That wouldn't solve the 3998 * nested hv case which needs to abort the hcall or zero the 3999 * time limit. 4000 * 4001 * XXX: Another day's problem. 4002 */ 4003 mtspr(SPRN_DEC, kvmppc_dec_expires_host_tb(vcpu) - *tb); 4004 4005 mtspr(SPRN_DAR, vcpu->arch.shregs.dar); 4006 mtspr(SPRN_DSISR, vcpu->arch.shregs.dsisr); 4007 switch_pmu_to_guest(vcpu, &host_os_sprs); 4008 trap = plpar_hcall_norets(H_ENTER_NESTED, __pa(&hvregs), 4009 __pa(&vcpu->arch.regs)); 4010 kvmhv_restore_hv_return_state(vcpu, &hvregs); 4011 switch_pmu_to_host(vcpu, &host_os_sprs); 4012 vcpu->arch.shregs.msr = vcpu->arch.regs.msr; 4013 vcpu->arch.shregs.dar = mfspr(SPRN_DAR); 4014 vcpu->arch.shregs.dsisr = mfspr(SPRN_DSISR); 4015 vcpu->arch.psscr = mfspr(SPRN_PSSCR_PR); 4016 4017 store_vcpu_state(vcpu); 4018 4019 dec = mfspr(SPRN_DEC); 4020 if (!(lpcr & LPCR_LD)) /* Sign extend if not using large decrementer */ 4021 dec = (s32) dec; 4022 *tb = mftb(); 4023 vcpu->arch.dec_expires = dec + (*tb + vc->tb_offset); 4024 4025 timer_rearm_host_dec(*tb); 4026 4027 restore_p9_host_os_sprs(vcpu, &host_os_sprs); 4028 if (vcpu->arch.psscr != host_psscr) 4029 mtspr(SPRN_PSSCR_PR, host_psscr); 4030 4031 return trap; 4032 } 4033 4034 /* 4035 * Guest entry for POWER9 and later CPUs. 4036 */ 4037 static int kvmhv_p9_guest_entry(struct kvm_vcpu *vcpu, u64 time_limit, 4038 unsigned long lpcr, u64 *tb) 4039 { 4040 struct kvm *kvm = vcpu->kvm; 4041 struct kvm_nested_guest *nested = vcpu->arch.nested; 4042 u64 next_timer; 4043 int trap; 4044 4045 next_timer = timer_get_next_tb(); 4046 if (*tb >= next_timer) 4047 return BOOK3S_INTERRUPT_HV_DECREMENTER; 4048 if (next_timer < time_limit) 4049 time_limit = next_timer; 4050 else if (*tb >= time_limit) /* nested time limit */ 4051 return BOOK3S_INTERRUPT_NESTED_HV_DECREMENTER; 4052 4053 vcpu->arch.ceded = 0; 4054 4055 vcpu_vpa_increment_dispatch(vcpu); 4056 4057 if (kvmhv_on_pseries()) { 4058 trap = kvmhv_vcpu_entry_p9_nested(vcpu, time_limit, lpcr, tb); 4059 4060 /* H_CEDE has to be handled now, not later */ 4061 if (trap == BOOK3S_INTERRUPT_SYSCALL && !nested && 4062 kvmppc_get_gpr(vcpu, 3) == H_CEDE) { 4063 kvmppc_cede(vcpu); 4064 kvmppc_set_gpr(vcpu, 3, 0); 4065 trap = 0; 4066 } 4067 4068 } else if (nested) { 4069 __this_cpu_write(cpu_in_guest, kvm); 4070 trap = kvmhv_vcpu_entry_p9(vcpu, time_limit, lpcr, tb); 4071 __this_cpu_write(cpu_in_guest, NULL); 4072 4073 } else { 4074 kvmppc_xive_push_vcpu(vcpu); 4075 4076 __this_cpu_write(cpu_in_guest, kvm); 4077 trap = kvmhv_vcpu_entry_p9(vcpu, time_limit, lpcr, tb); 4078 __this_cpu_write(cpu_in_guest, NULL); 4079 4080 if (trap == BOOK3S_INTERRUPT_SYSCALL && 4081 !(vcpu->arch.shregs.msr & MSR_PR)) { 4082 unsigned long req = kvmppc_get_gpr(vcpu, 3); 4083 4084 /* 4085 * XIVE rearm and XICS hcalls must be handled 4086 * before xive context is pulled (is this 4087 * true?) 4088 */ 4089 if (req == H_CEDE) { 4090 /* H_CEDE has to be handled now */ 4091 kvmppc_cede(vcpu); 4092 if (!kvmppc_xive_rearm_escalation(vcpu)) { 4093 /* 4094 * Pending escalation so abort 4095 * the cede. 4096 */ 4097 vcpu->arch.ceded = 0; 4098 } 4099 kvmppc_set_gpr(vcpu, 3, 0); 4100 trap = 0; 4101 4102 } else if (req == H_ENTER_NESTED) { 4103 /* 4104 * L2 should not run with the L1 4105 * context so rearm and pull it. 4106 */ 4107 if (!kvmppc_xive_rearm_escalation(vcpu)) { 4108 /* 4109 * Pending escalation so abort 4110 * H_ENTER_NESTED. 4111 */ 4112 kvmppc_set_gpr(vcpu, 3, 0); 4113 trap = 0; 4114 } 4115 4116 } else if (hcall_is_xics(req)) { 4117 int ret; 4118 4119 ret = kvmppc_xive_xics_hcall(vcpu, req); 4120 if (ret != H_TOO_HARD) { 4121 kvmppc_set_gpr(vcpu, 3, ret); 4122 trap = 0; 4123 } 4124 } 4125 } 4126 kvmppc_xive_pull_vcpu(vcpu); 4127 4128 if (kvm_is_radix(kvm)) 4129 vcpu->arch.slb_max = 0; 4130 } 4131 4132 vcpu_vpa_increment_dispatch(vcpu); 4133 4134 return trap; 4135 } 4136 4137 /* 4138 * Wait for some other vcpu thread to execute us, and 4139 * wake us up when we need to handle something in the host. 4140 */ 4141 static void kvmppc_wait_for_exec(struct kvmppc_vcore *vc, 4142 struct kvm_vcpu *vcpu, int wait_state) 4143 { 4144 DEFINE_WAIT(wait); 4145 4146 prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state); 4147 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) { 4148 spin_unlock(&vc->lock); 4149 schedule(); 4150 spin_lock(&vc->lock); 4151 } 4152 finish_wait(&vcpu->arch.cpu_run, &wait); 4153 } 4154 4155 static void grow_halt_poll_ns(struct kvmppc_vcore *vc) 4156 { 4157 if (!halt_poll_ns_grow) 4158 return; 4159 4160 vc->halt_poll_ns *= halt_poll_ns_grow; 4161 if (vc->halt_poll_ns < halt_poll_ns_grow_start) 4162 vc->halt_poll_ns = halt_poll_ns_grow_start; 4163 } 4164 4165 static void shrink_halt_poll_ns(struct kvmppc_vcore *vc) 4166 { 4167 if (halt_poll_ns_shrink == 0) 4168 vc->halt_poll_ns = 0; 4169 else 4170 vc->halt_poll_ns /= halt_poll_ns_shrink; 4171 } 4172 4173 #ifdef CONFIG_KVM_XICS 4174 static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu) 4175 { 4176 if (!xics_on_xive()) 4177 return false; 4178 return vcpu->arch.irq_pending || vcpu->arch.xive_saved_state.pipr < 4179 vcpu->arch.xive_saved_state.cppr; 4180 } 4181 #else 4182 static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu) 4183 { 4184 return false; 4185 } 4186 #endif /* CONFIG_KVM_XICS */ 4187 4188 static bool kvmppc_vcpu_woken(struct kvm_vcpu *vcpu) 4189 { 4190 if (vcpu->arch.pending_exceptions || vcpu->arch.prodded || 4191 kvmppc_doorbell_pending(vcpu) || xive_interrupt_pending(vcpu)) 4192 return true; 4193 4194 return false; 4195 } 4196 4197 static bool kvmppc_vcpu_check_block(struct kvm_vcpu *vcpu) 4198 { 4199 if (!vcpu->arch.ceded || kvmppc_vcpu_woken(vcpu)) 4200 return true; 4201 return false; 4202 } 4203 4204 /* 4205 * Check to see if any of the runnable vcpus on the vcore have pending 4206 * exceptions or are no longer ceded 4207 */ 4208 static int kvmppc_vcore_check_block(struct kvmppc_vcore *vc) 4209 { 4210 struct kvm_vcpu *vcpu; 4211 int i; 4212 4213 for_each_runnable_thread(i, vcpu, vc) { 4214 if (kvmppc_vcpu_check_block(vcpu)) 4215 return 1; 4216 } 4217 4218 return 0; 4219 } 4220 4221 /* 4222 * All the vcpus in this vcore are idle, so wait for a decrementer 4223 * or external interrupt to one of the vcpus. vc->lock is held. 4224 */ 4225 static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc) 4226 { 4227 ktime_t cur, start_poll, start_wait; 4228 int do_sleep = 1; 4229 u64 block_ns; 4230 4231 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); 4232 4233 /* Poll for pending exceptions and ceded state */ 4234 cur = start_poll = ktime_get(); 4235 if (vc->halt_poll_ns) { 4236 ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns); 4237 ++vc->runner->stat.generic.halt_attempted_poll; 4238 4239 vc->vcore_state = VCORE_POLLING; 4240 spin_unlock(&vc->lock); 4241 4242 do { 4243 if (kvmppc_vcore_check_block(vc)) { 4244 do_sleep = 0; 4245 break; 4246 } 4247 cur = ktime_get(); 4248 } while (kvm_vcpu_can_poll(cur, stop)); 4249 4250 spin_lock(&vc->lock); 4251 vc->vcore_state = VCORE_INACTIVE; 4252 4253 if (!do_sleep) { 4254 ++vc->runner->stat.generic.halt_successful_poll; 4255 goto out; 4256 } 4257 } 4258 4259 prepare_to_rcuwait(&vc->wait); 4260 set_current_state(TASK_INTERRUPTIBLE); 4261 if (kvmppc_vcore_check_block(vc)) { 4262 finish_rcuwait(&vc->wait); 4263 do_sleep = 0; 4264 /* If we polled, count this as a successful poll */ 4265 if (vc->halt_poll_ns) 4266 ++vc->runner->stat.generic.halt_successful_poll; 4267 goto out; 4268 } 4269 4270 start_wait = ktime_get(); 4271 4272 vc->vcore_state = VCORE_SLEEPING; 4273 trace_kvmppc_vcore_blocked(vc->runner, 0); 4274 spin_unlock(&vc->lock); 4275 schedule(); 4276 finish_rcuwait(&vc->wait); 4277 spin_lock(&vc->lock); 4278 vc->vcore_state = VCORE_INACTIVE; 4279 trace_kvmppc_vcore_blocked(vc->runner, 1); 4280 ++vc->runner->stat.halt_successful_wait; 4281 4282 cur = ktime_get(); 4283 4284 out: 4285 block_ns = ktime_to_ns(cur) - ktime_to_ns(start_poll); 4286 4287 /* Attribute wait time */ 4288 if (do_sleep) { 4289 vc->runner->stat.generic.halt_wait_ns += 4290 ktime_to_ns(cur) - ktime_to_ns(start_wait); 4291 KVM_STATS_LOG_HIST_UPDATE( 4292 vc->runner->stat.generic.halt_wait_hist, 4293 ktime_to_ns(cur) - ktime_to_ns(start_wait)); 4294 /* Attribute failed poll time */ 4295 if (vc->halt_poll_ns) { 4296 vc->runner->stat.generic.halt_poll_fail_ns += 4297 ktime_to_ns(start_wait) - 4298 ktime_to_ns(start_poll); 4299 KVM_STATS_LOG_HIST_UPDATE( 4300 vc->runner->stat.generic.halt_poll_fail_hist, 4301 ktime_to_ns(start_wait) - 4302 ktime_to_ns(start_poll)); 4303 } 4304 } else { 4305 /* Attribute successful poll time */ 4306 if (vc->halt_poll_ns) { 4307 vc->runner->stat.generic.halt_poll_success_ns += 4308 ktime_to_ns(cur) - 4309 ktime_to_ns(start_poll); 4310 KVM_STATS_LOG_HIST_UPDATE( 4311 vc->runner->stat.generic.halt_poll_success_hist, 4312 ktime_to_ns(cur) - ktime_to_ns(start_poll)); 4313 } 4314 } 4315 4316 /* Adjust poll time */ 4317 if (halt_poll_ns) { 4318 if (block_ns <= vc->halt_poll_ns) 4319 ; 4320 /* We slept and blocked for longer than the max halt time */ 4321 else if (vc->halt_poll_ns && block_ns > halt_poll_ns) 4322 shrink_halt_poll_ns(vc); 4323 /* We slept and our poll time is too small */ 4324 else if (vc->halt_poll_ns < halt_poll_ns && 4325 block_ns < halt_poll_ns) 4326 grow_halt_poll_ns(vc); 4327 if (vc->halt_poll_ns > halt_poll_ns) 4328 vc->halt_poll_ns = halt_poll_ns; 4329 } else 4330 vc->halt_poll_ns = 0; 4331 4332 trace_kvmppc_vcore_wakeup(do_sleep, block_ns); 4333 } 4334 4335 /* 4336 * This never fails for a radix guest, as none of the operations it does 4337 * for a radix guest can fail or have a way to report failure. 4338 */ 4339 static int kvmhv_setup_mmu(struct kvm_vcpu *vcpu) 4340 { 4341 int r = 0; 4342 struct kvm *kvm = vcpu->kvm; 4343 4344 mutex_lock(&kvm->arch.mmu_setup_lock); 4345 if (!kvm->arch.mmu_ready) { 4346 if (!kvm_is_radix(kvm)) 4347 r = kvmppc_hv_setup_htab_rma(vcpu); 4348 if (!r) { 4349 if (cpu_has_feature(CPU_FTR_ARCH_300)) 4350 kvmppc_setup_partition_table(kvm); 4351 kvm->arch.mmu_ready = 1; 4352 } 4353 } 4354 mutex_unlock(&kvm->arch.mmu_setup_lock); 4355 return r; 4356 } 4357 4358 static int kvmppc_run_vcpu(struct kvm_vcpu *vcpu) 4359 { 4360 struct kvm_run *run = vcpu->run; 4361 int n_ceded, i, r; 4362 struct kvmppc_vcore *vc; 4363 struct kvm_vcpu *v; 4364 4365 trace_kvmppc_run_vcpu_enter(vcpu); 4366 4367 run->exit_reason = 0; 4368 vcpu->arch.ret = RESUME_GUEST; 4369 vcpu->arch.trap = 0; 4370 kvmppc_update_vpas(vcpu); 4371 4372 /* 4373 * Synchronize with other threads in this virtual core 4374 */ 4375 vc = vcpu->arch.vcore; 4376 spin_lock(&vc->lock); 4377 vcpu->arch.ceded = 0; 4378 vcpu->arch.run_task = current; 4379 vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb()); 4380 vcpu->arch.state = KVMPPC_VCPU_RUNNABLE; 4381 vcpu->arch.busy_preempt = TB_NIL; 4382 WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], vcpu); 4383 ++vc->n_runnable; 4384 4385 /* 4386 * This happens the first time this is called for a vcpu. 4387 * If the vcore is already running, we may be able to start 4388 * this thread straight away and have it join in. 4389 */ 4390 if (!signal_pending(current)) { 4391 if ((vc->vcore_state == VCORE_PIGGYBACK || 4392 vc->vcore_state == VCORE_RUNNING) && 4393 !VCORE_IS_EXITING(vc)) { 4394 kvmppc_create_dtl_entry(vcpu, vc); 4395 kvmppc_start_thread(vcpu, vc); 4396 trace_kvm_guest_enter(vcpu); 4397 } else if (vc->vcore_state == VCORE_SLEEPING) { 4398 rcuwait_wake_up(&vc->wait); 4399 } 4400 4401 } 4402 4403 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE && 4404 !signal_pending(current)) { 4405 /* See if the MMU is ready to go */ 4406 if (!vcpu->kvm->arch.mmu_ready) { 4407 spin_unlock(&vc->lock); 4408 r = kvmhv_setup_mmu(vcpu); 4409 spin_lock(&vc->lock); 4410 if (r) { 4411 run->exit_reason = KVM_EXIT_FAIL_ENTRY; 4412 run->fail_entry. 4413 hardware_entry_failure_reason = 0; 4414 vcpu->arch.ret = r; 4415 break; 4416 } 4417 } 4418 4419 if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL) 4420 kvmppc_vcore_end_preempt(vc); 4421 4422 if (vc->vcore_state != VCORE_INACTIVE) { 4423 kvmppc_wait_for_exec(vc, vcpu, TASK_INTERRUPTIBLE); 4424 continue; 4425 } 4426 for_each_runnable_thread(i, v, vc) { 4427 kvmppc_core_prepare_to_enter(v); 4428 if (signal_pending(v->arch.run_task)) { 4429 kvmppc_remove_runnable(vc, v, mftb()); 4430 v->stat.signal_exits++; 4431 v->run->exit_reason = KVM_EXIT_INTR; 4432 v->arch.ret = -EINTR; 4433 wake_up(&v->arch.cpu_run); 4434 } 4435 } 4436 if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE) 4437 break; 4438 n_ceded = 0; 4439 for_each_runnable_thread(i, v, vc) { 4440 if (!kvmppc_vcpu_woken(v)) 4441 n_ceded += v->arch.ceded; 4442 else 4443 v->arch.ceded = 0; 4444 } 4445 vc->runner = vcpu; 4446 if (n_ceded == vc->n_runnable) { 4447 kvmppc_vcore_blocked(vc); 4448 } else if (need_resched()) { 4449 kvmppc_vcore_preempt(vc); 4450 /* Let something else run */ 4451 cond_resched_lock(&vc->lock); 4452 if (vc->vcore_state == VCORE_PREEMPT) 4453 kvmppc_vcore_end_preempt(vc); 4454 } else { 4455 kvmppc_run_core(vc); 4456 } 4457 vc->runner = NULL; 4458 } 4459 4460 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE && 4461 (vc->vcore_state == VCORE_RUNNING || 4462 vc->vcore_state == VCORE_EXITING || 4463 vc->vcore_state == VCORE_PIGGYBACK)) 4464 kvmppc_wait_for_exec(vc, vcpu, TASK_UNINTERRUPTIBLE); 4465 4466 if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL) 4467 kvmppc_vcore_end_preempt(vc); 4468 4469 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) { 4470 kvmppc_remove_runnable(vc, vcpu, mftb()); 4471 vcpu->stat.signal_exits++; 4472 run->exit_reason = KVM_EXIT_INTR; 4473 vcpu->arch.ret = -EINTR; 4474 } 4475 4476 if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) { 4477 /* Wake up some vcpu to run the core */ 4478 i = -1; 4479 v = next_runnable_thread(vc, &i); 4480 wake_up(&v->arch.cpu_run); 4481 } 4482 4483 trace_kvmppc_run_vcpu_exit(vcpu); 4484 spin_unlock(&vc->lock); 4485 return vcpu->arch.ret; 4486 } 4487 4488 int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit, 4489 unsigned long lpcr) 4490 { 4491 struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu); 4492 struct kvm_run *run = vcpu->run; 4493 int trap, r, pcpu; 4494 int srcu_idx; 4495 struct kvmppc_vcore *vc; 4496 struct kvm *kvm = vcpu->kvm; 4497 struct kvm_nested_guest *nested = vcpu->arch.nested; 4498 unsigned long flags; 4499 u64 tb; 4500 4501 trace_kvmppc_run_vcpu_enter(vcpu); 4502 4503 run->exit_reason = 0; 4504 vcpu->arch.ret = RESUME_GUEST; 4505 vcpu->arch.trap = 0; 4506 4507 vc = vcpu->arch.vcore; 4508 vcpu->arch.ceded = 0; 4509 vcpu->arch.run_task = current; 4510 vcpu->arch.state = KVMPPC_VCPU_RUNNABLE; 4511 vcpu->arch.last_inst = KVM_INST_FETCH_FAILED; 4512 4513 /* See if the MMU is ready to go */ 4514 if (unlikely(!kvm->arch.mmu_ready)) { 4515 r = kvmhv_setup_mmu(vcpu); 4516 if (r) { 4517 run->exit_reason = KVM_EXIT_FAIL_ENTRY; 4518 run->fail_entry.hardware_entry_failure_reason = 0; 4519 vcpu->arch.ret = r; 4520 return r; 4521 } 4522 } 4523 4524 if (need_resched()) 4525 cond_resched(); 4526 4527 kvmppc_update_vpas(vcpu); 4528 4529 preempt_disable(); 4530 pcpu = smp_processor_id(); 4531 if (kvm_is_radix(kvm)) 4532 kvmppc_prepare_radix_vcpu(vcpu, pcpu); 4533 4534 /* flags save not required, but irq_pmu has no disable/enable API */ 4535 powerpc_local_irq_pmu_save(flags); 4536 4537 if (signal_pending(current)) 4538 goto sigpend; 4539 if (need_resched() || !kvm->arch.mmu_ready) 4540 goto out; 4541 4542 vcpu->cpu = pcpu; 4543 vcpu->arch.thread_cpu = pcpu; 4544 vc->pcpu = pcpu; 4545 local_paca->kvm_hstate.kvm_vcpu = vcpu; 4546 local_paca->kvm_hstate.ptid = 0; 4547 local_paca->kvm_hstate.fake_suspend = 0; 4548 4549 /* 4550 * Orders set cpu/thread_cpu vs testing for pending interrupts and 4551 * doorbells below. The other side is when these fields are set vs 4552 * kvmppc_fast_vcpu_kick_hv reading the cpu/thread_cpu fields to 4553 * kick a vCPU to notice the pending interrupt. 4554 */ 4555 smp_mb(); 4556 4557 if (!nested) { 4558 kvmppc_core_prepare_to_enter(vcpu); 4559 if (vcpu->arch.shregs.msr & MSR_EE) { 4560 if (xive_interrupt_pending(vcpu)) 4561 kvmppc_inject_interrupt_hv(vcpu, 4562 BOOK3S_INTERRUPT_EXTERNAL, 0); 4563 } else if (test_bit(BOOK3S_IRQPRIO_EXTERNAL, 4564 &vcpu->arch.pending_exceptions)) { 4565 lpcr |= LPCR_MER; 4566 } 4567 } else if (vcpu->arch.pending_exceptions || 4568 vcpu->arch.doorbell_request || 4569 xive_interrupt_pending(vcpu)) { 4570 vcpu->arch.ret = RESUME_HOST; 4571 goto out; 4572 } 4573 4574 if (vcpu->arch.timer_running) { 4575 hrtimer_try_to_cancel(&vcpu->arch.dec_timer); 4576 vcpu->arch.timer_running = 0; 4577 } 4578 4579 tb = mftb(); 4580 4581 __kvmppc_create_dtl_entry(vcpu, pcpu, tb + vc->tb_offset, 0); 4582 4583 trace_kvm_guest_enter(vcpu); 4584 4585 guest_enter_irqoff(); 4586 4587 srcu_idx = srcu_read_lock(&kvm->srcu); 4588 4589 this_cpu_disable_ftrace(); 4590 4591 /* Tell lockdep that we're about to enable interrupts */ 4592 trace_hardirqs_on(); 4593 4594 trap = kvmhv_p9_guest_entry(vcpu, time_limit, lpcr, &tb); 4595 vcpu->arch.trap = trap; 4596 4597 trace_hardirqs_off(); 4598 4599 this_cpu_enable_ftrace(); 4600 4601 srcu_read_unlock(&kvm->srcu, srcu_idx); 4602 4603 set_irq_happened(trap); 4604 4605 context_tracking_guest_exit(); 4606 if (!vtime_accounting_enabled_this_cpu()) { 4607 local_irq_enable(); 4608 /* 4609 * Service IRQs here before vtime_account_guest_exit() so any 4610 * ticks that occurred while running the guest are accounted to 4611 * the guest. If vtime accounting is enabled, accounting uses 4612 * TB rather than ticks, so it can be done without enabling 4613 * interrupts here, which has the problem that it accounts 4614 * interrupt processing overhead to the host. 4615 */ 4616 local_irq_disable(); 4617 } 4618 vtime_account_guest_exit(); 4619 4620 vcpu->cpu = -1; 4621 vcpu->arch.thread_cpu = -1; 4622 4623 powerpc_local_irq_pmu_restore(flags); 4624 4625 preempt_enable(); 4626 4627 /* 4628 * cancel pending decrementer exception if DEC is now positive, or if 4629 * entering a nested guest in which case the decrementer is now owned 4630 * by L2 and the L1 decrementer is provided in hdec_expires 4631 */ 4632 if (kvmppc_core_pending_dec(vcpu) && 4633 ((tb < kvmppc_dec_expires_host_tb(vcpu)) || 4634 (trap == BOOK3S_INTERRUPT_SYSCALL && 4635 kvmppc_get_gpr(vcpu, 3) == H_ENTER_NESTED))) 4636 kvmppc_core_dequeue_dec(vcpu); 4637 4638 trace_kvm_guest_exit(vcpu); 4639 r = RESUME_GUEST; 4640 if (trap) { 4641 if (!nested) 4642 r = kvmppc_handle_exit_hv(vcpu, current); 4643 else 4644 r = kvmppc_handle_nested_exit(vcpu); 4645 } 4646 vcpu->arch.ret = r; 4647 4648 if (is_kvmppc_resume_guest(r) && !kvmppc_vcpu_check_block(vcpu)) { 4649 kvmppc_set_timer(vcpu); 4650 4651 prepare_to_rcuwait(wait); 4652 for (;;) { 4653 set_current_state(TASK_INTERRUPTIBLE); 4654 if (signal_pending(current)) { 4655 vcpu->stat.signal_exits++; 4656 run->exit_reason = KVM_EXIT_INTR; 4657 vcpu->arch.ret = -EINTR; 4658 break; 4659 } 4660 4661 if (kvmppc_vcpu_check_block(vcpu)) 4662 break; 4663 4664 trace_kvmppc_vcore_blocked(vcpu, 0); 4665 schedule(); 4666 trace_kvmppc_vcore_blocked(vcpu, 1); 4667 } 4668 finish_rcuwait(wait); 4669 } 4670 vcpu->arch.ceded = 0; 4671 4672 done: 4673 trace_kvmppc_run_vcpu_exit(vcpu); 4674 4675 return vcpu->arch.ret; 4676 4677 sigpend: 4678 vcpu->stat.signal_exits++; 4679 run->exit_reason = KVM_EXIT_INTR; 4680 vcpu->arch.ret = -EINTR; 4681 out: 4682 vcpu->cpu = -1; 4683 vcpu->arch.thread_cpu = -1; 4684 powerpc_local_irq_pmu_restore(flags); 4685 preempt_enable(); 4686 goto done; 4687 } 4688 4689 static int kvmppc_vcpu_run_hv(struct kvm_vcpu *vcpu) 4690 { 4691 struct kvm_run *run = vcpu->run; 4692 int r; 4693 int srcu_idx; 4694 struct kvm *kvm; 4695 unsigned long msr; 4696 4697 if (!vcpu->arch.sane) { 4698 run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 4699 return -EINVAL; 4700 } 4701 4702 /* No need to go into the guest when all we'll do is come back out */ 4703 if (signal_pending(current)) { 4704 run->exit_reason = KVM_EXIT_INTR; 4705 return -EINTR; 4706 } 4707 4708 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 4709 /* 4710 * Don't allow entry with a suspended transaction, because 4711 * the guest entry/exit code will lose it. 4712 */ 4713 if (cpu_has_feature(CPU_FTR_TM) && current->thread.regs && 4714 (current->thread.regs->msr & MSR_TM)) { 4715 if (MSR_TM_ACTIVE(current->thread.regs->msr)) { 4716 run->exit_reason = KVM_EXIT_FAIL_ENTRY; 4717 run->fail_entry.hardware_entry_failure_reason = 0; 4718 return -EINVAL; 4719 } 4720 } 4721 #endif 4722 4723 /* 4724 * Force online to 1 for the sake of old userspace which doesn't 4725 * set it. 4726 */ 4727 if (!vcpu->arch.online) { 4728 atomic_inc(&vcpu->arch.vcore->online_count); 4729 vcpu->arch.online = 1; 4730 } 4731 4732 kvmppc_core_prepare_to_enter(vcpu); 4733 4734 kvm = vcpu->kvm; 4735 atomic_inc(&kvm->arch.vcpus_running); 4736 /* Order vcpus_running vs. mmu_ready, see kvmppc_alloc_reset_hpt */ 4737 smp_mb(); 4738 4739 msr = 0; 4740 if (IS_ENABLED(CONFIG_PPC_FPU)) 4741 msr |= MSR_FP; 4742 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 4743 msr |= MSR_VEC; 4744 if (cpu_has_feature(CPU_FTR_VSX)) 4745 msr |= MSR_VSX; 4746 if ((cpu_has_feature(CPU_FTR_TM) || 4747 cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) && 4748 (vcpu->arch.hfscr & HFSCR_TM)) 4749 msr |= MSR_TM; 4750 msr = msr_check_and_set(msr); 4751 4752 kvmppc_save_user_regs(); 4753 4754 kvmppc_save_current_sprs(); 4755 4756 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 4757 vcpu->arch.waitp = &vcpu->arch.vcore->wait; 4758 vcpu->arch.pgdir = kvm->mm->pgd; 4759 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; 4760 4761 do { 4762 if (cpu_has_feature(CPU_FTR_ARCH_300)) 4763 r = kvmhv_run_single_vcpu(vcpu, ~(u64)0, 4764 vcpu->arch.vcore->lpcr); 4765 else 4766 r = kvmppc_run_vcpu(vcpu); 4767 4768 if (run->exit_reason == KVM_EXIT_PAPR_HCALL) { 4769 if (WARN_ON_ONCE(vcpu->arch.shregs.msr & MSR_PR)) { 4770 /* 4771 * These should have been caught reflected 4772 * into the guest by now. Final sanity check: 4773 * don't allow userspace to execute hcalls in 4774 * the hypervisor. 4775 */ 4776 r = RESUME_GUEST; 4777 continue; 4778 } 4779 trace_kvm_hcall_enter(vcpu); 4780 r = kvmppc_pseries_do_hcall(vcpu); 4781 trace_kvm_hcall_exit(vcpu, r); 4782 kvmppc_core_prepare_to_enter(vcpu); 4783 } else if (r == RESUME_PAGE_FAULT) { 4784 srcu_idx = srcu_read_lock(&kvm->srcu); 4785 r = kvmppc_book3s_hv_page_fault(vcpu, 4786 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); 4787 srcu_read_unlock(&kvm->srcu, srcu_idx); 4788 } else if (r == RESUME_PASSTHROUGH) { 4789 if (WARN_ON(xics_on_xive())) 4790 r = H_SUCCESS; 4791 else 4792 r = kvmppc_xics_rm_complete(vcpu, 0); 4793 } 4794 } while (is_kvmppc_resume_guest(r)); 4795 4796 vcpu->arch.state = KVMPPC_VCPU_NOTREADY; 4797 atomic_dec(&kvm->arch.vcpus_running); 4798 4799 srr_regs_clobbered(); 4800 4801 return r; 4802 } 4803 4804 static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps, 4805 int shift, int sllp) 4806 { 4807 (*sps)->page_shift = shift; 4808 (*sps)->slb_enc = sllp; 4809 (*sps)->enc[0].page_shift = shift; 4810 (*sps)->enc[0].pte_enc = kvmppc_pgsize_lp_encoding(shift, shift); 4811 /* 4812 * Add 16MB MPSS support (may get filtered out by userspace) 4813 */ 4814 if (shift != 24) { 4815 int penc = kvmppc_pgsize_lp_encoding(shift, 24); 4816 if (penc != -1) { 4817 (*sps)->enc[1].page_shift = 24; 4818 (*sps)->enc[1].pte_enc = penc; 4819 } 4820 } 4821 (*sps)++; 4822 } 4823 4824 static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm, 4825 struct kvm_ppc_smmu_info *info) 4826 { 4827 struct kvm_ppc_one_seg_page_size *sps; 4828 4829 /* 4830 * POWER7, POWER8 and POWER9 all support 32 storage keys for data. 4831 * POWER7 doesn't support keys for instruction accesses, 4832 * POWER8 and POWER9 do. 4833 */ 4834 info->data_keys = 32; 4835 info->instr_keys = cpu_has_feature(CPU_FTR_ARCH_207S) ? 32 : 0; 4836 4837 /* POWER7, 8 and 9 all have 1T segments and 32-entry SLB */ 4838 info->flags = KVM_PPC_PAGE_SIZES_REAL | KVM_PPC_1T_SEGMENTS; 4839 info->slb_size = 32; 4840 4841 /* We only support these sizes for now, and no muti-size segments */ 4842 sps = &info->sps[0]; 4843 kvmppc_add_seg_page_size(&sps, 12, 0); 4844 kvmppc_add_seg_page_size(&sps, 16, SLB_VSID_L | SLB_VSID_LP_01); 4845 kvmppc_add_seg_page_size(&sps, 24, SLB_VSID_L); 4846 4847 /* If running as a nested hypervisor, we don't support HPT guests */ 4848 if (kvmhv_on_pseries()) 4849 info->flags |= KVM_PPC_NO_HASH; 4850 4851 return 0; 4852 } 4853 4854 /* 4855 * Get (and clear) the dirty memory log for a memory slot. 4856 */ 4857 static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm, 4858 struct kvm_dirty_log *log) 4859 { 4860 struct kvm_memslots *slots; 4861 struct kvm_memory_slot *memslot; 4862 int r; 4863 unsigned long n, i; 4864 unsigned long *buf, *p; 4865 struct kvm_vcpu *vcpu; 4866 4867 mutex_lock(&kvm->slots_lock); 4868 4869 r = -EINVAL; 4870 if (log->slot >= KVM_USER_MEM_SLOTS) 4871 goto out; 4872 4873 slots = kvm_memslots(kvm); 4874 memslot = id_to_memslot(slots, log->slot); 4875 r = -ENOENT; 4876 if (!memslot || !memslot->dirty_bitmap) 4877 goto out; 4878 4879 /* 4880 * Use second half of bitmap area because both HPT and radix 4881 * accumulate bits in the first half. 4882 */ 4883 n = kvm_dirty_bitmap_bytes(memslot); 4884 buf = memslot->dirty_bitmap + n / sizeof(long); 4885 memset(buf, 0, n); 4886 4887 if (kvm_is_radix(kvm)) 4888 r = kvmppc_hv_get_dirty_log_radix(kvm, memslot, buf); 4889 else 4890 r = kvmppc_hv_get_dirty_log_hpt(kvm, memslot, buf); 4891 if (r) 4892 goto out; 4893 4894 /* 4895 * We accumulate dirty bits in the first half of the 4896 * memslot's dirty_bitmap area, for when pages are paged 4897 * out or modified by the host directly. Pick up these 4898 * bits and add them to the map. 4899 */ 4900 p = memslot->dirty_bitmap; 4901 for (i = 0; i < n / sizeof(long); ++i) 4902 buf[i] |= xchg(&p[i], 0); 4903 4904 /* Harvest dirty bits from VPA and DTL updates */ 4905 /* Note: we never modify the SLB shadow buffer areas */ 4906 kvm_for_each_vcpu(i, vcpu, kvm) { 4907 spin_lock(&vcpu->arch.vpa_update_lock); 4908 kvmppc_harvest_vpa_dirty(&vcpu->arch.vpa, memslot, buf); 4909 kvmppc_harvest_vpa_dirty(&vcpu->arch.dtl, memslot, buf); 4910 spin_unlock(&vcpu->arch.vpa_update_lock); 4911 } 4912 4913 r = -EFAULT; 4914 if (copy_to_user(log->dirty_bitmap, buf, n)) 4915 goto out; 4916 4917 r = 0; 4918 out: 4919 mutex_unlock(&kvm->slots_lock); 4920 return r; 4921 } 4922 4923 static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *slot) 4924 { 4925 vfree(slot->arch.rmap); 4926 slot->arch.rmap = NULL; 4927 } 4928 4929 static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm, 4930 const struct kvm_memory_slot *old, 4931 struct kvm_memory_slot *new, 4932 enum kvm_mr_change change) 4933 { 4934 if (change == KVM_MR_CREATE) { 4935 unsigned long size = array_size(new->npages, sizeof(*new->arch.rmap)); 4936 4937 if ((size >> PAGE_SHIFT) > totalram_pages()) 4938 return -ENOMEM; 4939 4940 new->arch.rmap = vzalloc(size); 4941 if (!new->arch.rmap) 4942 return -ENOMEM; 4943 } else if (change != KVM_MR_DELETE) { 4944 new->arch.rmap = old->arch.rmap; 4945 } 4946 4947 return 0; 4948 } 4949 4950 static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm, 4951 struct kvm_memory_slot *old, 4952 const struct kvm_memory_slot *new, 4953 enum kvm_mr_change change) 4954 { 4955 /* 4956 * If we are creating or modifying a memslot, it might make 4957 * some address that was previously cached as emulated 4958 * MMIO be no longer emulated MMIO, so invalidate 4959 * all the caches of emulated MMIO translations. 4960 */ 4961 if (change != KVM_MR_DELETE) 4962 atomic64_inc(&kvm->arch.mmio_update); 4963 4964 /* 4965 * For change == KVM_MR_MOVE or KVM_MR_DELETE, higher levels 4966 * have already called kvm_arch_flush_shadow_memslot() to 4967 * flush shadow mappings. For KVM_MR_CREATE we have no 4968 * previous mappings. So the only case to handle is 4969 * KVM_MR_FLAGS_ONLY when the KVM_MEM_LOG_DIRTY_PAGES bit 4970 * has been changed. 4971 * For radix guests, we flush on setting KVM_MEM_LOG_DIRTY_PAGES 4972 * to get rid of any THP PTEs in the partition-scoped page tables 4973 * so we can track dirtiness at the page level; we flush when 4974 * clearing KVM_MEM_LOG_DIRTY_PAGES so that we can go back to 4975 * using THP PTEs. 4976 */ 4977 if (change == KVM_MR_FLAGS_ONLY && kvm_is_radix(kvm) && 4978 ((new->flags ^ old->flags) & KVM_MEM_LOG_DIRTY_PAGES)) 4979 kvmppc_radix_flush_memslot(kvm, old); 4980 /* 4981 * If UV hasn't yet called H_SVM_INIT_START, don't register memslots. 4982 */ 4983 if (!kvm->arch.secure_guest) 4984 return; 4985 4986 switch (change) { 4987 case KVM_MR_CREATE: 4988 /* 4989 * @TODO kvmppc_uvmem_memslot_create() can fail and 4990 * return error. Fix this. 4991 */ 4992 kvmppc_uvmem_memslot_create(kvm, new); 4993 break; 4994 case KVM_MR_DELETE: 4995 kvmppc_uvmem_memslot_delete(kvm, old); 4996 break; 4997 default: 4998 /* TODO: Handle KVM_MR_MOVE */ 4999 break; 5000 } 5001 } 5002 5003 /* 5004 * Update LPCR values in kvm->arch and in vcores. 5005 * Caller must hold kvm->arch.mmu_setup_lock (for mutual exclusion 5006 * of kvm->arch.lpcr update). 5007 */ 5008 void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask) 5009 { 5010 long int i; 5011 u32 cores_done = 0; 5012 5013 if ((kvm->arch.lpcr & mask) == lpcr) 5014 return; 5015 5016 kvm->arch.lpcr = (kvm->arch.lpcr & ~mask) | lpcr; 5017 5018 for (i = 0; i < KVM_MAX_VCORES; ++i) { 5019 struct kvmppc_vcore *vc = kvm->arch.vcores[i]; 5020 if (!vc) 5021 continue; 5022 5023 spin_lock(&vc->lock); 5024 vc->lpcr = (vc->lpcr & ~mask) | lpcr; 5025 verify_lpcr(kvm, vc->lpcr); 5026 spin_unlock(&vc->lock); 5027 if (++cores_done >= kvm->arch.online_vcores) 5028 break; 5029 } 5030 } 5031 5032 void kvmppc_setup_partition_table(struct kvm *kvm) 5033 { 5034 unsigned long dw0, dw1; 5035 5036 if (!kvm_is_radix(kvm)) { 5037 /* PS field - page size for VRMA */ 5038 dw0 = ((kvm->arch.vrma_slb_v & SLB_VSID_L) >> 1) | 5039 ((kvm->arch.vrma_slb_v & SLB_VSID_LP) << 1); 5040 /* HTABSIZE and HTABORG fields */ 5041 dw0 |= kvm->arch.sdr1; 5042 5043 /* Second dword as set by userspace */ 5044 dw1 = kvm->arch.process_table; 5045 } else { 5046 dw0 = PATB_HR | radix__get_tree_size() | 5047 __pa(kvm->arch.pgtable) | RADIX_PGD_INDEX_SIZE; 5048 dw1 = PATB_GR | kvm->arch.process_table; 5049 } 5050 kvmhv_set_ptbl_entry(kvm->arch.lpid, dw0, dw1); 5051 } 5052 5053 /* 5054 * Set up HPT (hashed page table) and RMA (real-mode area). 5055 * Must be called with kvm->arch.mmu_setup_lock held. 5056 */ 5057 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu) 5058 { 5059 int err = 0; 5060 struct kvm *kvm = vcpu->kvm; 5061 unsigned long hva; 5062 struct kvm_memory_slot *memslot; 5063 struct vm_area_struct *vma; 5064 unsigned long lpcr = 0, senc; 5065 unsigned long psize, porder; 5066 int srcu_idx; 5067 5068 /* Allocate hashed page table (if not done already) and reset it */ 5069 if (!kvm->arch.hpt.virt) { 5070 int order = KVM_DEFAULT_HPT_ORDER; 5071 struct kvm_hpt_info info; 5072 5073 err = kvmppc_allocate_hpt(&info, order); 5074 /* If we get here, it means userspace didn't specify a 5075 * size explicitly. So, try successively smaller 5076 * sizes if the default failed. */ 5077 while ((err == -ENOMEM) && --order >= PPC_MIN_HPT_ORDER) 5078 err = kvmppc_allocate_hpt(&info, order); 5079 5080 if (err < 0) { 5081 pr_err("KVM: Couldn't alloc HPT\n"); 5082 goto out; 5083 } 5084 5085 kvmppc_set_hpt(kvm, &info); 5086 } 5087 5088 /* Look up the memslot for guest physical address 0 */ 5089 srcu_idx = srcu_read_lock(&kvm->srcu); 5090 memslot = gfn_to_memslot(kvm, 0); 5091 5092 /* We must have some memory at 0 by now */ 5093 err = -EINVAL; 5094 if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) 5095 goto out_srcu; 5096 5097 /* Look up the VMA for the start of this memory slot */ 5098 hva = memslot->userspace_addr; 5099 mmap_read_lock(kvm->mm); 5100 vma = vma_lookup(kvm->mm, hva); 5101 if (!vma || (vma->vm_flags & VM_IO)) 5102 goto up_out; 5103 5104 psize = vma_kernel_pagesize(vma); 5105 5106 mmap_read_unlock(kvm->mm); 5107 5108 /* We can handle 4k, 64k or 16M pages in the VRMA */ 5109 if (psize >= 0x1000000) 5110 psize = 0x1000000; 5111 else if (psize >= 0x10000) 5112 psize = 0x10000; 5113 else 5114 psize = 0x1000; 5115 porder = __ilog2(psize); 5116 5117 senc = slb_pgsize_encoding(psize); 5118 kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T | 5119 (VRMA_VSID << SLB_VSID_SHIFT_1T); 5120 /* Create HPTEs in the hash page table for the VRMA */ 5121 kvmppc_map_vrma(vcpu, memslot, porder); 5122 5123 /* Update VRMASD field in the LPCR */ 5124 if (!cpu_has_feature(CPU_FTR_ARCH_300)) { 5125 /* the -4 is to account for senc values starting at 0x10 */ 5126 lpcr = senc << (LPCR_VRMASD_SH - 4); 5127 kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD); 5128 } 5129 5130 /* Order updates to kvm->arch.lpcr etc. vs. mmu_ready */ 5131 smp_wmb(); 5132 err = 0; 5133 out_srcu: 5134 srcu_read_unlock(&kvm->srcu, srcu_idx); 5135 out: 5136 return err; 5137 5138 up_out: 5139 mmap_read_unlock(kvm->mm); 5140 goto out_srcu; 5141 } 5142 5143 /* 5144 * Must be called with kvm->arch.mmu_setup_lock held and 5145 * mmu_ready = 0 and no vcpus running. 5146 */ 5147 int kvmppc_switch_mmu_to_hpt(struct kvm *kvm) 5148 { 5149 unsigned long lpcr, lpcr_mask; 5150 5151 if (nesting_enabled(kvm)) 5152 kvmhv_release_all_nested(kvm); 5153 kvmppc_rmap_reset(kvm); 5154 kvm->arch.process_table = 0; 5155 /* Mutual exclusion with kvm_unmap_gfn_range etc. */ 5156 spin_lock(&kvm->mmu_lock); 5157 kvm->arch.radix = 0; 5158 spin_unlock(&kvm->mmu_lock); 5159 kvmppc_free_radix(kvm); 5160 5161 lpcr = LPCR_VPM1; 5162 lpcr_mask = LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR; 5163 if (cpu_has_feature(CPU_FTR_ARCH_31)) 5164 lpcr_mask |= LPCR_HAIL; 5165 kvmppc_update_lpcr(kvm, lpcr, lpcr_mask); 5166 5167 return 0; 5168 } 5169 5170 /* 5171 * Must be called with kvm->arch.mmu_setup_lock held and 5172 * mmu_ready = 0 and no vcpus running. 5173 */ 5174 int kvmppc_switch_mmu_to_radix(struct kvm *kvm) 5175 { 5176 unsigned long lpcr, lpcr_mask; 5177 int err; 5178 5179 err = kvmppc_init_vm_radix(kvm); 5180 if (err) 5181 return err; 5182 kvmppc_rmap_reset(kvm); 5183 /* Mutual exclusion with kvm_unmap_gfn_range etc. */ 5184 spin_lock(&kvm->mmu_lock); 5185 kvm->arch.radix = 1; 5186 spin_unlock(&kvm->mmu_lock); 5187 kvmppc_free_hpt(&kvm->arch.hpt); 5188 5189 lpcr = LPCR_UPRT | LPCR_GTSE | LPCR_HR; 5190 lpcr_mask = LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR; 5191 if (cpu_has_feature(CPU_FTR_ARCH_31)) { 5192 lpcr_mask |= LPCR_HAIL; 5193 if (cpu_has_feature(CPU_FTR_HVMODE) && 5194 (kvm->arch.host_lpcr & LPCR_HAIL)) 5195 lpcr |= LPCR_HAIL; 5196 } 5197 kvmppc_update_lpcr(kvm, lpcr, lpcr_mask); 5198 5199 return 0; 5200 } 5201 5202 #ifdef CONFIG_KVM_XICS 5203 /* 5204 * Allocate a per-core structure for managing state about which cores are 5205 * running in the host versus the guest and for exchanging data between 5206 * real mode KVM and CPU running in the host. 5207 * This is only done for the first VM. 5208 * The allocated structure stays even if all VMs have stopped. 5209 * It is only freed when the kvm-hv module is unloaded. 5210 * It's OK for this routine to fail, we just don't support host 5211 * core operations like redirecting H_IPI wakeups. 5212 */ 5213 void kvmppc_alloc_host_rm_ops(void) 5214 { 5215 struct kvmppc_host_rm_ops *ops; 5216 unsigned long l_ops; 5217 int cpu, core; 5218 int size; 5219 5220 if (cpu_has_feature(CPU_FTR_ARCH_300)) 5221 return; 5222 5223 /* Not the first time here ? */ 5224 if (kvmppc_host_rm_ops_hv != NULL) 5225 return; 5226 5227 ops = kzalloc(sizeof(struct kvmppc_host_rm_ops), GFP_KERNEL); 5228 if (!ops) 5229 return; 5230 5231 size = cpu_nr_cores() * sizeof(struct kvmppc_host_rm_core); 5232 ops->rm_core = kzalloc(size, GFP_KERNEL); 5233 5234 if (!ops->rm_core) { 5235 kfree(ops); 5236 return; 5237 } 5238 5239 cpus_read_lock(); 5240 5241 for (cpu = 0; cpu < nr_cpu_ids; cpu += threads_per_core) { 5242 if (!cpu_online(cpu)) 5243 continue; 5244 5245 core = cpu >> threads_shift; 5246 ops->rm_core[core].rm_state.in_host = 1; 5247 } 5248 5249 ops->vcpu_kick = kvmppc_fast_vcpu_kick_hv; 5250 5251 /* 5252 * Make the contents of the kvmppc_host_rm_ops structure visible 5253 * to other CPUs before we assign it to the global variable. 5254 * Do an atomic assignment (no locks used here), but if someone 5255 * beats us to it, just free our copy and return. 5256 */ 5257 smp_wmb(); 5258 l_ops = (unsigned long) ops; 5259 5260 if (cmpxchg64((unsigned long *)&kvmppc_host_rm_ops_hv, 0, l_ops)) { 5261 cpus_read_unlock(); 5262 kfree(ops->rm_core); 5263 kfree(ops); 5264 return; 5265 } 5266 5267 cpuhp_setup_state_nocalls_cpuslocked(CPUHP_KVM_PPC_BOOK3S_PREPARE, 5268 "ppc/kvm_book3s:prepare", 5269 kvmppc_set_host_core, 5270 kvmppc_clear_host_core); 5271 cpus_read_unlock(); 5272 } 5273 5274 void kvmppc_free_host_rm_ops(void) 5275 { 5276 if (kvmppc_host_rm_ops_hv) { 5277 cpuhp_remove_state_nocalls(CPUHP_KVM_PPC_BOOK3S_PREPARE); 5278 kfree(kvmppc_host_rm_ops_hv->rm_core); 5279 kfree(kvmppc_host_rm_ops_hv); 5280 kvmppc_host_rm_ops_hv = NULL; 5281 } 5282 } 5283 #endif 5284 5285 static int kvmppc_core_init_vm_hv(struct kvm *kvm) 5286 { 5287 unsigned long lpcr, lpid; 5288 int ret; 5289 5290 mutex_init(&kvm->arch.uvmem_lock); 5291 INIT_LIST_HEAD(&kvm->arch.uvmem_pfns); 5292 mutex_init(&kvm->arch.mmu_setup_lock); 5293 5294 /* Allocate the guest's logical partition ID */ 5295 5296 lpid = kvmppc_alloc_lpid(); 5297 if ((long)lpid < 0) 5298 return -ENOMEM; 5299 kvm->arch.lpid = lpid; 5300 5301 kvmppc_alloc_host_rm_ops(); 5302 5303 kvmhv_vm_nested_init(kvm); 5304 5305 /* 5306 * Since we don't flush the TLB when tearing down a VM, 5307 * and this lpid might have previously been used, 5308 * make sure we flush on each core before running the new VM. 5309 * On POWER9, the tlbie in mmu_partition_table_set_entry() 5310 * does this flush for us. 5311 */ 5312 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5313 cpumask_setall(&kvm->arch.need_tlb_flush); 5314 5315 /* Start out with the default set of hcalls enabled */ 5316 memcpy(kvm->arch.enabled_hcalls, default_enabled_hcalls, 5317 sizeof(kvm->arch.enabled_hcalls)); 5318 5319 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5320 kvm->arch.host_sdr1 = mfspr(SPRN_SDR1); 5321 5322 /* Init LPCR for virtual RMA mode */ 5323 if (cpu_has_feature(CPU_FTR_HVMODE)) { 5324 kvm->arch.host_lpid = mfspr(SPRN_LPID); 5325 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR); 5326 lpcr &= LPCR_PECE | LPCR_LPES; 5327 } else { 5328 /* 5329 * The L2 LPES mode will be set by the L0 according to whether 5330 * or not it needs to take external interrupts in HV mode. 5331 */ 5332 lpcr = 0; 5333 } 5334 lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE | 5335 LPCR_VPM0 | LPCR_VPM1; 5336 kvm->arch.vrma_slb_v = SLB_VSID_B_1T | 5337 (VRMA_VSID << SLB_VSID_SHIFT_1T); 5338 /* On POWER8 turn on online bit to enable PURR/SPURR */ 5339 if (cpu_has_feature(CPU_FTR_ARCH_207S)) 5340 lpcr |= LPCR_ONL; 5341 /* 5342 * On POWER9, VPM0 bit is reserved (VPM0=1 behaviour is assumed) 5343 * Set HVICE bit to enable hypervisor virtualization interrupts. 5344 * Set HEIC to prevent OS interrupts to go to hypervisor (should 5345 * be unnecessary but better safe than sorry in case we re-enable 5346 * EE in HV mode with this LPCR still set) 5347 */ 5348 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 5349 lpcr &= ~LPCR_VPM0; 5350 lpcr |= LPCR_HVICE | LPCR_HEIC; 5351 5352 /* 5353 * If xive is enabled, we route 0x500 interrupts directly 5354 * to the guest. 5355 */ 5356 if (xics_on_xive()) 5357 lpcr |= LPCR_LPES; 5358 } 5359 5360 /* 5361 * If the host uses radix, the guest starts out as radix. 5362 */ 5363 if (radix_enabled()) { 5364 kvm->arch.radix = 1; 5365 kvm->arch.mmu_ready = 1; 5366 lpcr &= ~LPCR_VPM1; 5367 lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR; 5368 if (cpu_has_feature(CPU_FTR_HVMODE) && 5369 cpu_has_feature(CPU_FTR_ARCH_31) && 5370 (kvm->arch.host_lpcr & LPCR_HAIL)) 5371 lpcr |= LPCR_HAIL; 5372 ret = kvmppc_init_vm_radix(kvm); 5373 if (ret) { 5374 kvmppc_free_lpid(kvm->arch.lpid); 5375 return ret; 5376 } 5377 kvmppc_setup_partition_table(kvm); 5378 } 5379 5380 verify_lpcr(kvm, lpcr); 5381 kvm->arch.lpcr = lpcr; 5382 5383 /* Initialization for future HPT resizes */ 5384 kvm->arch.resize_hpt = NULL; 5385 5386 /* 5387 * Work out how many sets the TLB has, for the use of 5388 * the TLB invalidation loop in book3s_hv_rmhandlers.S. 5389 */ 5390 if (cpu_has_feature(CPU_FTR_ARCH_31)) { 5391 /* 5392 * P10 will flush all the congruence class with a single tlbiel 5393 */ 5394 kvm->arch.tlb_sets = 1; 5395 } else if (radix_enabled()) 5396 kvm->arch.tlb_sets = POWER9_TLB_SETS_RADIX; /* 128 */ 5397 else if (cpu_has_feature(CPU_FTR_ARCH_300)) 5398 kvm->arch.tlb_sets = POWER9_TLB_SETS_HASH; /* 256 */ 5399 else if (cpu_has_feature(CPU_FTR_ARCH_207S)) 5400 kvm->arch.tlb_sets = POWER8_TLB_SETS; /* 512 */ 5401 else 5402 kvm->arch.tlb_sets = POWER7_TLB_SETS; /* 128 */ 5403 5404 /* 5405 * Track that we now have a HV mode VM active. This blocks secondary 5406 * CPU threads from coming online. 5407 */ 5408 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5409 kvm_hv_vm_activated(); 5410 5411 /* 5412 * Initialize smt_mode depending on processor. 5413 * POWER8 and earlier have to use "strict" threading, where 5414 * all vCPUs in a vcore have to run on the same (sub)core, 5415 * whereas on POWER9 the threads can each run a different 5416 * guest. 5417 */ 5418 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5419 kvm->arch.smt_mode = threads_per_subcore; 5420 else 5421 kvm->arch.smt_mode = 1; 5422 kvm->arch.emul_smt_mode = 1; 5423 5424 return 0; 5425 } 5426 5427 static int kvmppc_arch_create_vm_debugfs_hv(struct kvm *kvm) 5428 { 5429 kvmppc_mmu_debugfs_init(kvm); 5430 if (radix_enabled()) 5431 kvmhv_radix_debugfs_init(kvm); 5432 return 0; 5433 } 5434 5435 static void kvmppc_free_vcores(struct kvm *kvm) 5436 { 5437 long int i; 5438 5439 for (i = 0; i < KVM_MAX_VCORES; ++i) 5440 kfree(kvm->arch.vcores[i]); 5441 kvm->arch.online_vcores = 0; 5442 } 5443 5444 static void kvmppc_core_destroy_vm_hv(struct kvm *kvm) 5445 { 5446 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5447 kvm_hv_vm_deactivated(); 5448 5449 kvmppc_free_vcores(kvm); 5450 5451 5452 if (kvm_is_radix(kvm)) 5453 kvmppc_free_radix(kvm); 5454 else 5455 kvmppc_free_hpt(&kvm->arch.hpt); 5456 5457 /* Perform global invalidation and return lpid to the pool */ 5458 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 5459 if (nesting_enabled(kvm)) 5460 kvmhv_release_all_nested(kvm); 5461 kvm->arch.process_table = 0; 5462 if (kvm->arch.secure_guest) 5463 uv_svm_terminate(kvm->arch.lpid); 5464 kvmhv_set_ptbl_entry(kvm->arch.lpid, 0, 0); 5465 } 5466 5467 kvmppc_free_lpid(kvm->arch.lpid); 5468 5469 kvmppc_free_pimap(kvm); 5470 } 5471 5472 /* We don't need to emulate any privileged instructions or dcbz */ 5473 static int kvmppc_core_emulate_op_hv(struct kvm_vcpu *vcpu, 5474 unsigned int inst, int *advance) 5475 { 5476 return EMULATE_FAIL; 5477 } 5478 5479 static int kvmppc_core_emulate_mtspr_hv(struct kvm_vcpu *vcpu, int sprn, 5480 ulong spr_val) 5481 { 5482 return EMULATE_FAIL; 5483 } 5484 5485 static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn, 5486 ulong *spr_val) 5487 { 5488 return EMULATE_FAIL; 5489 } 5490 5491 static int kvmppc_core_check_processor_compat_hv(void) 5492 { 5493 if (cpu_has_feature(CPU_FTR_HVMODE) && 5494 cpu_has_feature(CPU_FTR_ARCH_206)) 5495 return 0; 5496 5497 /* POWER9 in radix mode is capable of being a nested hypervisor. */ 5498 if (cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled()) 5499 return 0; 5500 5501 return -EIO; 5502 } 5503 5504 #ifdef CONFIG_KVM_XICS 5505 5506 void kvmppc_free_pimap(struct kvm *kvm) 5507 { 5508 kfree(kvm->arch.pimap); 5509 } 5510 5511 static struct kvmppc_passthru_irqmap *kvmppc_alloc_pimap(void) 5512 { 5513 return kzalloc(sizeof(struct kvmppc_passthru_irqmap), GFP_KERNEL); 5514 } 5515 5516 static int kvmppc_set_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi) 5517 { 5518 struct irq_desc *desc; 5519 struct kvmppc_irq_map *irq_map; 5520 struct kvmppc_passthru_irqmap *pimap; 5521 struct irq_chip *chip; 5522 int i, rc = 0; 5523 struct irq_data *host_data; 5524 5525 if (!kvm_irq_bypass) 5526 return 1; 5527 5528 desc = irq_to_desc(host_irq); 5529 if (!desc) 5530 return -EIO; 5531 5532 mutex_lock(&kvm->lock); 5533 5534 pimap = kvm->arch.pimap; 5535 if (pimap == NULL) { 5536 /* First call, allocate structure to hold IRQ map */ 5537 pimap = kvmppc_alloc_pimap(); 5538 if (pimap == NULL) { 5539 mutex_unlock(&kvm->lock); 5540 return -ENOMEM; 5541 } 5542 kvm->arch.pimap = pimap; 5543 } 5544 5545 /* 5546 * For now, we only support interrupts for which the EOI operation 5547 * is an OPAL call followed by a write to XIRR, since that's 5548 * what our real-mode EOI code does, or a XIVE interrupt 5549 */ 5550 chip = irq_data_get_irq_chip(&desc->irq_data); 5551 if (!chip || !is_pnv_opal_msi(chip)) { 5552 pr_warn("kvmppc_set_passthru_irq_hv: Could not assign IRQ map for (%d,%d)\n", 5553 host_irq, guest_gsi); 5554 mutex_unlock(&kvm->lock); 5555 return -ENOENT; 5556 } 5557 5558 /* 5559 * See if we already have an entry for this guest IRQ number. 5560 * If it's mapped to a hardware IRQ number, that's an error, 5561 * otherwise re-use this entry. 5562 */ 5563 for (i = 0; i < pimap->n_mapped; i++) { 5564 if (guest_gsi == pimap->mapped[i].v_hwirq) { 5565 if (pimap->mapped[i].r_hwirq) { 5566 mutex_unlock(&kvm->lock); 5567 return -EINVAL; 5568 } 5569 break; 5570 } 5571 } 5572 5573 if (i == KVMPPC_PIRQ_MAPPED) { 5574 mutex_unlock(&kvm->lock); 5575 return -EAGAIN; /* table is full */ 5576 } 5577 5578 irq_map = &pimap->mapped[i]; 5579 5580 irq_map->v_hwirq = guest_gsi; 5581 irq_map->desc = desc; 5582 5583 /* 5584 * Order the above two stores before the next to serialize with 5585 * the KVM real mode handler. 5586 */ 5587 smp_wmb(); 5588 5589 /* 5590 * The 'host_irq' number is mapped in the PCI-MSI domain but 5591 * the underlying calls, which will EOI the interrupt in real 5592 * mode, need an HW IRQ number mapped in the XICS IRQ domain. 5593 */ 5594 host_data = irq_domain_get_irq_data(irq_get_default_host(), host_irq); 5595 irq_map->r_hwirq = (unsigned int)irqd_to_hwirq(host_data); 5596 5597 if (i == pimap->n_mapped) 5598 pimap->n_mapped++; 5599 5600 if (xics_on_xive()) 5601 rc = kvmppc_xive_set_mapped(kvm, guest_gsi, host_irq); 5602 else 5603 kvmppc_xics_set_mapped(kvm, guest_gsi, irq_map->r_hwirq); 5604 if (rc) 5605 irq_map->r_hwirq = 0; 5606 5607 mutex_unlock(&kvm->lock); 5608 5609 return 0; 5610 } 5611 5612 static int kvmppc_clr_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi) 5613 { 5614 struct irq_desc *desc; 5615 struct kvmppc_passthru_irqmap *pimap; 5616 int i, rc = 0; 5617 5618 if (!kvm_irq_bypass) 5619 return 0; 5620 5621 desc = irq_to_desc(host_irq); 5622 if (!desc) 5623 return -EIO; 5624 5625 mutex_lock(&kvm->lock); 5626 if (!kvm->arch.pimap) 5627 goto unlock; 5628 5629 pimap = kvm->arch.pimap; 5630 5631 for (i = 0; i < pimap->n_mapped; i++) { 5632 if (guest_gsi == pimap->mapped[i].v_hwirq) 5633 break; 5634 } 5635 5636 if (i == pimap->n_mapped) { 5637 mutex_unlock(&kvm->lock); 5638 return -ENODEV; 5639 } 5640 5641 if (xics_on_xive()) 5642 rc = kvmppc_xive_clr_mapped(kvm, guest_gsi, host_irq); 5643 else 5644 kvmppc_xics_clr_mapped(kvm, guest_gsi, pimap->mapped[i].r_hwirq); 5645 5646 /* invalidate the entry (what do do on error from the above ?) */ 5647 pimap->mapped[i].r_hwirq = 0; 5648 5649 /* 5650 * We don't free this structure even when the count goes to 5651 * zero. The structure is freed when we destroy the VM. 5652 */ 5653 unlock: 5654 mutex_unlock(&kvm->lock); 5655 return rc; 5656 } 5657 5658 static int kvmppc_irq_bypass_add_producer_hv(struct irq_bypass_consumer *cons, 5659 struct irq_bypass_producer *prod) 5660 { 5661 int ret = 0; 5662 struct kvm_kernel_irqfd *irqfd = 5663 container_of(cons, struct kvm_kernel_irqfd, consumer); 5664 5665 irqfd->producer = prod; 5666 5667 ret = kvmppc_set_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi); 5668 if (ret) 5669 pr_info("kvmppc_set_passthru_irq (irq %d, gsi %d) fails: %d\n", 5670 prod->irq, irqfd->gsi, ret); 5671 5672 return ret; 5673 } 5674 5675 static void kvmppc_irq_bypass_del_producer_hv(struct irq_bypass_consumer *cons, 5676 struct irq_bypass_producer *prod) 5677 { 5678 int ret; 5679 struct kvm_kernel_irqfd *irqfd = 5680 container_of(cons, struct kvm_kernel_irqfd, consumer); 5681 5682 irqfd->producer = NULL; 5683 5684 /* 5685 * When producer of consumer is unregistered, we change back to 5686 * default external interrupt handling mode - KVM real mode 5687 * will switch back to host. 5688 */ 5689 ret = kvmppc_clr_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi); 5690 if (ret) 5691 pr_warn("kvmppc_clr_passthru_irq (irq %d, gsi %d) fails: %d\n", 5692 prod->irq, irqfd->gsi, ret); 5693 } 5694 #endif 5695 5696 static long kvm_arch_vm_ioctl_hv(struct file *filp, 5697 unsigned int ioctl, unsigned long arg) 5698 { 5699 struct kvm *kvm __maybe_unused = filp->private_data; 5700 void __user *argp = (void __user *)arg; 5701 long r; 5702 5703 switch (ioctl) { 5704 5705 case KVM_PPC_ALLOCATE_HTAB: { 5706 u32 htab_order; 5707 5708 /* If we're a nested hypervisor, we currently only support radix */ 5709 if (kvmhv_on_pseries()) { 5710 r = -EOPNOTSUPP; 5711 break; 5712 } 5713 5714 r = -EFAULT; 5715 if (get_user(htab_order, (u32 __user *)argp)) 5716 break; 5717 r = kvmppc_alloc_reset_hpt(kvm, htab_order); 5718 if (r) 5719 break; 5720 r = 0; 5721 break; 5722 } 5723 5724 case KVM_PPC_GET_HTAB_FD: { 5725 struct kvm_get_htab_fd ghf; 5726 5727 r = -EFAULT; 5728 if (copy_from_user(&ghf, argp, sizeof(ghf))) 5729 break; 5730 r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf); 5731 break; 5732 } 5733 5734 case KVM_PPC_RESIZE_HPT_PREPARE: { 5735 struct kvm_ppc_resize_hpt rhpt; 5736 5737 r = -EFAULT; 5738 if (copy_from_user(&rhpt, argp, sizeof(rhpt))) 5739 break; 5740 5741 r = kvm_vm_ioctl_resize_hpt_prepare(kvm, &rhpt); 5742 break; 5743 } 5744 5745 case KVM_PPC_RESIZE_HPT_COMMIT: { 5746 struct kvm_ppc_resize_hpt rhpt; 5747 5748 r = -EFAULT; 5749 if (copy_from_user(&rhpt, argp, sizeof(rhpt))) 5750 break; 5751 5752 r = kvm_vm_ioctl_resize_hpt_commit(kvm, &rhpt); 5753 break; 5754 } 5755 5756 default: 5757 r = -ENOTTY; 5758 } 5759 5760 return r; 5761 } 5762 5763 /* 5764 * List of hcall numbers to enable by default. 5765 * For compatibility with old userspace, we enable by default 5766 * all hcalls that were implemented before the hcall-enabling 5767 * facility was added. Note this list should not include H_RTAS. 5768 */ 5769 static unsigned int default_hcall_list[] = { 5770 H_REMOVE, 5771 H_ENTER, 5772 H_READ, 5773 H_PROTECT, 5774 H_BULK_REMOVE, 5775 #ifdef CONFIG_SPAPR_TCE_IOMMU 5776 H_GET_TCE, 5777 H_PUT_TCE, 5778 #endif 5779 H_SET_DABR, 5780 H_SET_XDABR, 5781 H_CEDE, 5782 H_PROD, 5783 H_CONFER, 5784 H_REGISTER_VPA, 5785 #ifdef CONFIG_KVM_XICS 5786 H_EOI, 5787 H_CPPR, 5788 H_IPI, 5789 H_IPOLL, 5790 H_XIRR, 5791 H_XIRR_X, 5792 #endif 5793 0 5794 }; 5795 5796 static void init_default_hcalls(void) 5797 { 5798 int i; 5799 unsigned int hcall; 5800 5801 for (i = 0; default_hcall_list[i]; ++i) { 5802 hcall = default_hcall_list[i]; 5803 WARN_ON(!kvmppc_hcall_impl_hv(hcall)); 5804 __set_bit(hcall / 4, default_enabled_hcalls); 5805 } 5806 } 5807 5808 static int kvmhv_configure_mmu(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg) 5809 { 5810 unsigned long lpcr; 5811 int radix; 5812 int err; 5813 5814 /* If not on a POWER9, reject it */ 5815 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5816 return -ENODEV; 5817 5818 /* If any unknown flags set, reject it */ 5819 if (cfg->flags & ~(KVM_PPC_MMUV3_RADIX | KVM_PPC_MMUV3_GTSE)) 5820 return -EINVAL; 5821 5822 /* GR (guest radix) bit in process_table field must match */ 5823 radix = !!(cfg->flags & KVM_PPC_MMUV3_RADIX); 5824 if (!!(cfg->process_table & PATB_GR) != radix) 5825 return -EINVAL; 5826 5827 /* Process table size field must be reasonable, i.e. <= 24 */ 5828 if ((cfg->process_table & PRTS_MASK) > 24) 5829 return -EINVAL; 5830 5831 /* We can change a guest to/from radix now, if the host is radix */ 5832 if (radix && !radix_enabled()) 5833 return -EINVAL; 5834 5835 /* If we're a nested hypervisor, we currently only support radix */ 5836 if (kvmhv_on_pseries() && !radix) 5837 return -EINVAL; 5838 5839 mutex_lock(&kvm->arch.mmu_setup_lock); 5840 if (radix != kvm_is_radix(kvm)) { 5841 if (kvm->arch.mmu_ready) { 5842 kvm->arch.mmu_ready = 0; 5843 /* order mmu_ready vs. vcpus_running */ 5844 smp_mb(); 5845 if (atomic_read(&kvm->arch.vcpus_running)) { 5846 kvm->arch.mmu_ready = 1; 5847 err = -EBUSY; 5848 goto out_unlock; 5849 } 5850 } 5851 if (radix) 5852 err = kvmppc_switch_mmu_to_radix(kvm); 5853 else 5854 err = kvmppc_switch_mmu_to_hpt(kvm); 5855 if (err) 5856 goto out_unlock; 5857 } 5858 5859 kvm->arch.process_table = cfg->process_table; 5860 kvmppc_setup_partition_table(kvm); 5861 5862 lpcr = (cfg->flags & KVM_PPC_MMUV3_GTSE) ? LPCR_GTSE : 0; 5863 kvmppc_update_lpcr(kvm, lpcr, LPCR_GTSE); 5864 err = 0; 5865 5866 out_unlock: 5867 mutex_unlock(&kvm->arch.mmu_setup_lock); 5868 return err; 5869 } 5870 5871 static int kvmhv_enable_nested(struct kvm *kvm) 5872 { 5873 if (!nested) 5874 return -EPERM; 5875 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5876 return -ENODEV; 5877 if (!radix_enabled()) 5878 return -ENODEV; 5879 5880 /* kvm == NULL means the caller is testing if the capability exists */ 5881 if (kvm) 5882 kvm->arch.nested_enable = true; 5883 return 0; 5884 } 5885 5886 static int kvmhv_load_from_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr, 5887 int size) 5888 { 5889 int rc = -EINVAL; 5890 5891 if (kvmhv_vcpu_is_radix(vcpu)) { 5892 rc = kvmhv_copy_from_guest_radix(vcpu, *eaddr, ptr, size); 5893 5894 if (rc > 0) 5895 rc = -EINVAL; 5896 } 5897 5898 /* For now quadrants are the only way to access nested guest memory */ 5899 if (rc && vcpu->arch.nested) 5900 rc = -EAGAIN; 5901 5902 return rc; 5903 } 5904 5905 static int kvmhv_store_to_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr, 5906 int size) 5907 { 5908 int rc = -EINVAL; 5909 5910 if (kvmhv_vcpu_is_radix(vcpu)) { 5911 rc = kvmhv_copy_to_guest_radix(vcpu, *eaddr, ptr, size); 5912 5913 if (rc > 0) 5914 rc = -EINVAL; 5915 } 5916 5917 /* For now quadrants are the only way to access nested guest memory */ 5918 if (rc && vcpu->arch.nested) 5919 rc = -EAGAIN; 5920 5921 return rc; 5922 } 5923 5924 static void unpin_vpa_reset(struct kvm *kvm, struct kvmppc_vpa *vpa) 5925 { 5926 unpin_vpa(kvm, vpa); 5927 vpa->gpa = 0; 5928 vpa->pinned_addr = NULL; 5929 vpa->dirty = false; 5930 vpa->update_pending = 0; 5931 } 5932 5933 /* 5934 * Enable a guest to become a secure VM, or test whether 5935 * that could be enabled. 5936 * Called when the KVM_CAP_PPC_SECURE_GUEST capability is 5937 * tested (kvm == NULL) or enabled (kvm != NULL). 5938 */ 5939 static int kvmhv_enable_svm(struct kvm *kvm) 5940 { 5941 if (!kvmppc_uvmem_available()) 5942 return -EINVAL; 5943 if (kvm) 5944 kvm->arch.svm_enabled = 1; 5945 return 0; 5946 } 5947 5948 /* 5949 * IOCTL handler to turn off secure mode of guest 5950 * 5951 * - Release all device pages 5952 * - Issue ucall to terminate the guest on the UV side 5953 * - Unpin the VPA pages. 5954 * - Reinit the partition scoped page tables 5955 */ 5956 static int kvmhv_svm_off(struct kvm *kvm) 5957 { 5958 struct kvm_vcpu *vcpu; 5959 int mmu_was_ready; 5960 int srcu_idx; 5961 int ret = 0; 5962 unsigned long i; 5963 5964 if (!(kvm->arch.secure_guest & KVMPPC_SECURE_INIT_START)) 5965 return ret; 5966 5967 mutex_lock(&kvm->arch.mmu_setup_lock); 5968 mmu_was_ready = kvm->arch.mmu_ready; 5969 if (kvm->arch.mmu_ready) { 5970 kvm->arch.mmu_ready = 0; 5971 /* order mmu_ready vs. vcpus_running */ 5972 smp_mb(); 5973 if (atomic_read(&kvm->arch.vcpus_running)) { 5974 kvm->arch.mmu_ready = 1; 5975 ret = -EBUSY; 5976 goto out; 5977 } 5978 } 5979 5980 srcu_idx = srcu_read_lock(&kvm->srcu); 5981 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { 5982 struct kvm_memory_slot *memslot; 5983 struct kvm_memslots *slots = __kvm_memslots(kvm, i); 5984 int bkt; 5985 5986 if (!slots) 5987 continue; 5988 5989 kvm_for_each_memslot(memslot, bkt, slots) { 5990 kvmppc_uvmem_drop_pages(memslot, kvm, true); 5991 uv_unregister_mem_slot(kvm->arch.lpid, memslot->id); 5992 } 5993 } 5994 srcu_read_unlock(&kvm->srcu, srcu_idx); 5995 5996 ret = uv_svm_terminate(kvm->arch.lpid); 5997 if (ret != U_SUCCESS) { 5998 ret = -EINVAL; 5999 goto out; 6000 } 6001 6002 /* 6003 * When secure guest is reset, all the guest pages are sent 6004 * to UV via UV_PAGE_IN before the non-boot vcpus get a 6005 * chance to run and unpin their VPA pages. Unpinning of all 6006 * VPA pages is done here explicitly so that VPA pages 6007 * can be migrated to the secure side. 6008 * 6009 * This is required to for the secure SMP guest to reboot 6010 * correctly. 6011 */ 6012 kvm_for_each_vcpu(i, vcpu, kvm) { 6013 spin_lock(&vcpu->arch.vpa_update_lock); 6014 unpin_vpa_reset(kvm, &vcpu->arch.dtl); 6015 unpin_vpa_reset(kvm, &vcpu->arch.slb_shadow); 6016 unpin_vpa_reset(kvm, &vcpu->arch.vpa); 6017 spin_unlock(&vcpu->arch.vpa_update_lock); 6018 } 6019 6020 kvmppc_setup_partition_table(kvm); 6021 kvm->arch.secure_guest = 0; 6022 kvm->arch.mmu_ready = mmu_was_ready; 6023 out: 6024 mutex_unlock(&kvm->arch.mmu_setup_lock); 6025 return ret; 6026 } 6027 6028 static int kvmhv_enable_dawr1(struct kvm *kvm) 6029 { 6030 if (!cpu_has_feature(CPU_FTR_DAWR1)) 6031 return -ENODEV; 6032 6033 /* kvm == NULL means the caller is testing if the capability exists */ 6034 if (kvm) 6035 kvm->arch.dawr1_enabled = true; 6036 return 0; 6037 } 6038 6039 static bool kvmppc_hash_v3_possible(void) 6040 { 6041 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 6042 return false; 6043 6044 if (!cpu_has_feature(CPU_FTR_HVMODE)) 6045 return false; 6046 6047 /* 6048 * POWER9 chips before version 2.02 can't have some threads in 6049 * HPT mode and some in radix mode on the same core. 6050 */ 6051 if (radix_enabled()) { 6052 unsigned int pvr = mfspr(SPRN_PVR); 6053 if ((pvr >> 16) == PVR_POWER9 && 6054 (((pvr & 0xe000) == 0 && (pvr & 0xfff) < 0x202) || 6055 ((pvr & 0xe000) == 0x2000 && (pvr & 0xfff) < 0x101))) 6056 return false; 6057 } 6058 6059 return true; 6060 } 6061 6062 static struct kvmppc_ops kvm_ops_hv = { 6063 .get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv, 6064 .set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv, 6065 .get_one_reg = kvmppc_get_one_reg_hv, 6066 .set_one_reg = kvmppc_set_one_reg_hv, 6067 .vcpu_load = kvmppc_core_vcpu_load_hv, 6068 .vcpu_put = kvmppc_core_vcpu_put_hv, 6069 .inject_interrupt = kvmppc_inject_interrupt_hv, 6070 .set_msr = kvmppc_set_msr_hv, 6071 .vcpu_run = kvmppc_vcpu_run_hv, 6072 .vcpu_create = kvmppc_core_vcpu_create_hv, 6073 .vcpu_free = kvmppc_core_vcpu_free_hv, 6074 .check_requests = kvmppc_core_check_requests_hv, 6075 .get_dirty_log = kvm_vm_ioctl_get_dirty_log_hv, 6076 .flush_memslot = kvmppc_core_flush_memslot_hv, 6077 .prepare_memory_region = kvmppc_core_prepare_memory_region_hv, 6078 .commit_memory_region = kvmppc_core_commit_memory_region_hv, 6079 .unmap_gfn_range = kvm_unmap_gfn_range_hv, 6080 .age_gfn = kvm_age_gfn_hv, 6081 .test_age_gfn = kvm_test_age_gfn_hv, 6082 .set_spte_gfn = kvm_set_spte_gfn_hv, 6083 .free_memslot = kvmppc_core_free_memslot_hv, 6084 .init_vm = kvmppc_core_init_vm_hv, 6085 .destroy_vm = kvmppc_core_destroy_vm_hv, 6086 .get_smmu_info = kvm_vm_ioctl_get_smmu_info_hv, 6087 .emulate_op = kvmppc_core_emulate_op_hv, 6088 .emulate_mtspr = kvmppc_core_emulate_mtspr_hv, 6089 .emulate_mfspr = kvmppc_core_emulate_mfspr_hv, 6090 .fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv, 6091 .arch_vm_ioctl = kvm_arch_vm_ioctl_hv, 6092 .hcall_implemented = kvmppc_hcall_impl_hv, 6093 #ifdef CONFIG_KVM_XICS 6094 .irq_bypass_add_producer = kvmppc_irq_bypass_add_producer_hv, 6095 .irq_bypass_del_producer = kvmppc_irq_bypass_del_producer_hv, 6096 #endif 6097 .configure_mmu = kvmhv_configure_mmu, 6098 .get_rmmu_info = kvmhv_get_rmmu_info, 6099 .set_smt_mode = kvmhv_set_smt_mode, 6100 .enable_nested = kvmhv_enable_nested, 6101 .load_from_eaddr = kvmhv_load_from_eaddr, 6102 .store_to_eaddr = kvmhv_store_to_eaddr, 6103 .enable_svm = kvmhv_enable_svm, 6104 .svm_off = kvmhv_svm_off, 6105 .enable_dawr1 = kvmhv_enable_dawr1, 6106 .hash_v3_possible = kvmppc_hash_v3_possible, 6107 .create_vcpu_debugfs = kvmppc_arch_create_vcpu_debugfs_hv, 6108 .create_vm_debugfs = kvmppc_arch_create_vm_debugfs_hv, 6109 }; 6110 6111 static int kvm_init_subcore_bitmap(void) 6112 { 6113 int i, j; 6114 int nr_cores = cpu_nr_cores(); 6115 struct sibling_subcore_state *sibling_subcore_state; 6116 6117 for (i = 0; i < nr_cores; i++) { 6118 int first_cpu = i * threads_per_core; 6119 int node = cpu_to_node(first_cpu); 6120 6121 /* Ignore if it is already allocated. */ 6122 if (paca_ptrs[first_cpu]->sibling_subcore_state) 6123 continue; 6124 6125 sibling_subcore_state = 6126 kzalloc_node(sizeof(struct sibling_subcore_state), 6127 GFP_KERNEL, node); 6128 if (!sibling_subcore_state) 6129 return -ENOMEM; 6130 6131 6132 for (j = 0; j < threads_per_core; j++) { 6133 int cpu = first_cpu + j; 6134 6135 paca_ptrs[cpu]->sibling_subcore_state = 6136 sibling_subcore_state; 6137 } 6138 } 6139 return 0; 6140 } 6141 6142 static int kvmppc_radix_possible(void) 6143 { 6144 return cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled(); 6145 } 6146 6147 static int kvmppc_book3s_init_hv(void) 6148 { 6149 int r; 6150 6151 if (!tlbie_capable) { 6152 pr_err("KVM-HV: Host does not support TLBIE\n"); 6153 return -ENODEV; 6154 } 6155 6156 /* 6157 * FIXME!! Do we need to check on all cpus ? 6158 */ 6159 r = kvmppc_core_check_processor_compat_hv(); 6160 if (r < 0) 6161 return -ENODEV; 6162 6163 r = kvmhv_nested_init(); 6164 if (r) 6165 return r; 6166 6167 if (!cpu_has_feature(CPU_FTR_ARCH_300)) { 6168 r = kvm_init_subcore_bitmap(); 6169 if (r) 6170 goto err; 6171 } 6172 6173 /* 6174 * We need a way of accessing the XICS interrupt controller, 6175 * either directly, via paca_ptrs[cpu]->kvm_hstate.xics_phys, or 6176 * indirectly, via OPAL. 6177 */ 6178 #ifdef CONFIG_SMP 6179 if (!xics_on_xive() && !kvmhv_on_pseries() && 6180 !local_paca->kvm_hstate.xics_phys) { 6181 struct device_node *np; 6182 6183 np = of_find_compatible_node(NULL, NULL, "ibm,opal-intc"); 6184 if (!np) { 6185 pr_err("KVM-HV: Cannot determine method for accessing XICS\n"); 6186 r = -ENODEV; 6187 goto err; 6188 } 6189 /* presence of intc confirmed - node can be dropped again */ 6190 of_node_put(np); 6191 } 6192 #endif 6193 6194 init_default_hcalls(); 6195 6196 init_vcore_lists(); 6197 6198 r = kvmppc_mmu_hv_init(); 6199 if (r) 6200 goto err; 6201 6202 if (kvmppc_radix_possible()) { 6203 r = kvmppc_radix_init(); 6204 if (r) 6205 goto err; 6206 } 6207 6208 r = kvmppc_uvmem_init(); 6209 if (r < 0) { 6210 pr_err("KVM-HV: kvmppc_uvmem_init failed %d\n", r); 6211 return r; 6212 } 6213 6214 kvm_ops_hv.owner = THIS_MODULE; 6215 kvmppc_hv_ops = &kvm_ops_hv; 6216 6217 return 0; 6218 6219 err: 6220 kvmhv_nested_exit(); 6221 kvmppc_radix_exit(); 6222 6223 return r; 6224 } 6225 6226 static void kvmppc_book3s_exit_hv(void) 6227 { 6228 kvmppc_uvmem_free(); 6229 kvmppc_free_host_rm_ops(); 6230 if (kvmppc_radix_possible()) 6231 kvmppc_radix_exit(); 6232 kvmppc_hv_ops = NULL; 6233 kvmhv_nested_exit(); 6234 } 6235 6236 module_init(kvmppc_book3s_init_hv); 6237 module_exit(kvmppc_book3s_exit_hv); 6238 MODULE_LICENSE("GPL"); 6239 MODULE_ALIAS_MISCDEV(KVM_MINOR); 6240 MODULE_ALIAS("devname:kvm"); 6241