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 46 #include <asm/ftrace.h> 47 #include <asm/reg.h> 48 #include <asm/ppc-opcode.h> 49 #include <asm/asm-prototypes.h> 50 #include <asm/archrandom.h> 51 #include <asm/debug.h> 52 #include <asm/disassemble.h> 53 #include <asm/cputable.h> 54 #include <asm/cacheflush.h> 55 #include <linux/uaccess.h> 56 #include <asm/io.h> 57 #include <asm/kvm_ppc.h> 58 #include <asm/kvm_book3s.h> 59 #include <asm/mmu_context.h> 60 #include <asm/lppaca.h> 61 #include <asm/processor.h> 62 #include <asm/cputhreads.h> 63 #include <asm/page.h> 64 #include <asm/hvcall.h> 65 #include <asm/switch_to.h> 66 #include <asm/smp.h> 67 #include <asm/dbell.h> 68 #include <asm/hmi.h> 69 #include <asm/pnv-pci.h> 70 #include <asm/mmu.h> 71 #include <asm/opal.h> 72 #include <asm/xics.h> 73 #include <asm/xive.h> 74 #include <asm/hw_breakpoint.h> 75 #include <asm/kvm_book3s_uvmem.h> 76 #include <asm/ultravisor.h> 77 #include <asm/dtl.h> 78 79 #include "book3s.h" 80 81 #define CREATE_TRACE_POINTS 82 #include "trace_hv.h" 83 84 /* #define EXIT_DEBUG */ 85 /* #define EXIT_DEBUG_SIMPLE */ 86 /* #define EXIT_DEBUG_INT */ 87 88 /* Used to indicate that a guest page fault needs to be handled */ 89 #define RESUME_PAGE_FAULT (RESUME_GUEST | RESUME_FLAG_ARCH1) 90 /* Used to indicate that a guest passthrough interrupt needs to be handled */ 91 #define RESUME_PASSTHROUGH (RESUME_GUEST | RESUME_FLAG_ARCH2) 92 93 /* Used as a "null" value for timebase values */ 94 #define TB_NIL (~(u64)0) 95 96 static DECLARE_BITMAP(default_enabled_hcalls, MAX_HCALL_OPCODE/4 + 1); 97 98 static int dynamic_mt_modes = 6; 99 module_param(dynamic_mt_modes, int, 0644); 100 MODULE_PARM_DESC(dynamic_mt_modes, "Set of allowed dynamic micro-threading modes: 0 (= none), 2, 4, or 6 (= 2 or 4)"); 101 static int target_smt_mode; 102 module_param(target_smt_mode, int, 0644); 103 MODULE_PARM_DESC(target_smt_mode, "Target threads per core (0 = max)"); 104 105 static bool indep_threads_mode = true; 106 module_param(indep_threads_mode, bool, S_IRUGO | S_IWUSR); 107 MODULE_PARM_DESC(indep_threads_mode, "Independent-threads mode (only on POWER9)"); 108 109 static bool one_vm_per_core; 110 module_param(one_vm_per_core, bool, S_IRUGO | S_IWUSR); 111 MODULE_PARM_DESC(one_vm_per_core, "Only run vCPUs from the same VM on a core (requires indep_threads_mode=N)"); 112 113 #ifdef CONFIG_KVM_XICS 114 static struct kernel_param_ops module_param_ops = { 115 .set = param_set_int, 116 .get = param_get_int, 117 }; 118 119 module_param_cb(kvm_irq_bypass, &module_param_ops, &kvm_irq_bypass, 0644); 120 MODULE_PARM_DESC(kvm_irq_bypass, "Bypass passthrough interrupt optimization"); 121 122 module_param_cb(h_ipi_redirect, &module_param_ops, &h_ipi_redirect, 0644); 123 MODULE_PARM_DESC(h_ipi_redirect, "Redirect H_IPI wakeup to a free host core"); 124 #endif 125 126 /* If set, guests are allowed to create and control nested guests */ 127 static bool nested = true; 128 module_param(nested, bool, S_IRUGO | S_IWUSR); 129 MODULE_PARM_DESC(nested, "Enable nested virtualization (only on POWER9)"); 130 131 static inline bool nesting_enabled(struct kvm *kvm) 132 { 133 return kvm->arch.nested_enable && kvm_is_radix(kvm); 134 } 135 136 /* If set, the threads on each CPU core have to be in the same MMU mode */ 137 static bool no_mixing_hpt_and_radix; 138 139 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu); 140 141 /* 142 * RWMR values for POWER8. These control the rate at which PURR 143 * and SPURR count and should be set according to the number of 144 * online threads in the vcore being run. 145 */ 146 #define RWMR_RPA_P8_1THREAD 0x164520C62609AECAUL 147 #define RWMR_RPA_P8_2THREAD 0x7FFF2908450D8DA9UL 148 #define RWMR_RPA_P8_3THREAD 0x164520C62609AECAUL 149 #define RWMR_RPA_P8_4THREAD 0x199A421245058DA9UL 150 #define RWMR_RPA_P8_5THREAD 0x164520C62609AECAUL 151 #define RWMR_RPA_P8_6THREAD 0x164520C62609AECAUL 152 #define RWMR_RPA_P8_7THREAD 0x164520C62609AECAUL 153 #define RWMR_RPA_P8_8THREAD 0x164520C62609AECAUL 154 155 static unsigned long p8_rwmr_values[MAX_SMT_THREADS + 1] = { 156 RWMR_RPA_P8_1THREAD, 157 RWMR_RPA_P8_1THREAD, 158 RWMR_RPA_P8_2THREAD, 159 RWMR_RPA_P8_3THREAD, 160 RWMR_RPA_P8_4THREAD, 161 RWMR_RPA_P8_5THREAD, 162 RWMR_RPA_P8_6THREAD, 163 RWMR_RPA_P8_7THREAD, 164 RWMR_RPA_P8_8THREAD, 165 }; 166 167 static inline struct kvm_vcpu *next_runnable_thread(struct kvmppc_vcore *vc, 168 int *ip) 169 { 170 int i = *ip; 171 struct kvm_vcpu *vcpu; 172 173 while (++i < MAX_SMT_THREADS) { 174 vcpu = READ_ONCE(vc->runnable_threads[i]); 175 if (vcpu) { 176 *ip = i; 177 return vcpu; 178 } 179 } 180 return NULL; 181 } 182 183 /* Used to traverse the list of runnable threads for a given vcore */ 184 #define for_each_runnable_thread(i, vcpu, vc) \ 185 for (i = -1; (vcpu = next_runnable_thread(vc, &i)); ) 186 187 static bool kvmppc_ipi_thread(int cpu) 188 { 189 unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER); 190 191 /* If we're a nested hypervisor, fall back to ordinary IPIs for now */ 192 if (kvmhv_on_pseries()) 193 return false; 194 195 /* On POWER9 we can use msgsnd to IPI any cpu */ 196 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 197 msg |= get_hard_smp_processor_id(cpu); 198 smp_mb(); 199 __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg)); 200 return true; 201 } 202 203 /* On POWER8 for IPIs to threads in the same core, use msgsnd */ 204 if (cpu_has_feature(CPU_FTR_ARCH_207S)) { 205 preempt_disable(); 206 if (cpu_first_thread_sibling(cpu) == 207 cpu_first_thread_sibling(smp_processor_id())) { 208 msg |= cpu_thread_in_core(cpu); 209 smp_mb(); 210 __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg)); 211 preempt_enable(); 212 return true; 213 } 214 preempt_enable(); 215 } 216 217 #if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP) 218 if (cpu >= 0 && cpu < nr_cpu_ids) { 219 if (paca_ptrs[cpu]->kvm_hstate.xics_phys) { 220 xics_wake_cpu(cpu); 221 return true; 222 } 223 opal_int_set_mfrr(get_hard_smp_processor_id(cpu), IPI_PRIORITY); 224 return true; 225 } 226 #endif 227 228 return false; 229 } 230 231 static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu) 232 { 233 int cpu; 234 struct rcuwait *waitp; 235 236 waitp = kvm_arch_vcpu_get_wait(vcpu); 237 if (rcuwait_wake_up(waitp)) 238 ++vcpu->stat.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) 284 { 285 unsigned long flags; 286 287 spin_lock_irqsave(&vc->stoltb_lock, flags); 288 vc->preempt_tb = mftb(); 289 spin_unlock_irqrestore(&vc->stoltb_lock, flags); 290 } 291 292 static void kvmppc_core_end_stolen(struct kvmppc_vcore *vc) 293 { 294 unsigned long flags; 295 296 spin_lock_irqsave(&vc->stoltb_lock, flags); 297 if (vc->preempt_tb != TB_NIL) { 298 vc->stolen_tb += mftb() - vc->preempt_tb; 299 vc->preempt_tb = TB_NIL; 300 } 301 spin_unlock_irqrestore(&vc->stoltb_lock, flags); 302 } 303 304 static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu) 305 { 306 struct kvmppc_vcore *vc = vcpu->arch.vcore; 307 unsigned long flags; 308 309 /* 310 * We can test vc->runner without taking the vcore lock, 311 * because only this task ever sets vc->runner to this 312 * vcpu, and once it is set to this vcpu, only this task 313 * ever sets it to NULL. 314 */ 315 if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING) 316 kvmppc_core_end_stolen(vc); 317 318 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); 319 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST && 320 vcpu->arch.busy_preempt != TB_NIL) { 321 vcpu->arch.busy_stolen += mftb() - vcpu->arch.busy_preempt; 322 vcpu->arch.busy_preempt = TB_NIL; 323 } 324 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); 325 } 326 327 static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu) 328 { 329 struct kvmppc_vcore *vc = vcpu->arch.vcore; 330 unsigned long flags; 331 332 if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING) 333 kvmppc_core_start_stolen(vc); 334 335 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); 336 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST) 337 vcpu->arch.busy_preempt = mftb(); 338 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); 339 } 340 341 static void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr) 342 { 343 vcpu->arch.pvr = pvr; 344 } 345 346 /* Dummy value used in computing PCR value below */ 347 #define PCR_ARCH_31 (PCR_ARCH_300 << 1) 348 349 static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat) 350 { 351 unsigned long host_pcr_bit = 0, guest_pcr_bit = 0; 352 struct kvmppc_vcore *vc = vcpu->arch.vcore; 353 354 /* We can (emulate) our own architecture version and anything older */ 355 if (cpu_has_feature(CPU_FTR_ARCH_31)) 356 host_pcr_bit = PCR_ARCH_31; 357 else if (cpu_has_feature(CPU_FTR_ARCH_300)) 358 host_pcr_bit = PCR_ARCH_300; 359 else if (cpu_has_feature(CPU_FTR_ARCH_207S)) 360 host_pcr_bit = PCR_ARCH_207; 361 else if (cpu_has_feature(CPU_FTR_ARCH_206)) 362 host_pcr_bit = PCR_ARCH_206; 363 else 364 host_pcr_bit = PCR_ARCH_205; 365 366 /* Determine lowest PCR bit needed to run guest in given PVR level */ 367 guest_pcr_bit = host_pcr_bit; 368 if (arch_compat) { 369 switch (arch_compat) { 370 case PVR_ARCH_205: 371 guest_pcr_bit = PCR_ARCH_205; 372 break; 373 case PVR_ARCH_206: 374 case PVR_ARCH_206p: 375 guest_pcr_bit = PCR_ARCH_206; 376 break; 377 case PVR_ARCH_207: 378 guest_pcr_bit = PCR_ARCH_207; 379 break; 380 case PVR_ARCH_300: 381 guest_pcr_bit = PCR_ARCH_300; 382 break; 383 case PVR_ARCH_31: 384 guest_pcr_bit = PCR_ARCH_31; 385 break; 386 default: 387 return -EINVAL; 388 } 389 } 390 391 /* Check requested PCR bits don't exceed our capabilities */ 392 if (guest_pcr_bit > host_pcr_bit) 393 return -EINVAL; 394 395 spin_lock(&vc->lock); 396 vc->arch_compat = arch_compat; 397 /* 398 * Set all PCR bits for which guest_pcr_bit <= bit < host_pcr_bit 399 * Also set all reserved PCR bits 400 */ 401 vc->pcr = (host_pcr_bit - guest_pcr_bit) | PCR_MASK; 402 spin_unlock(&vc->lock); 403 404 return 0; 405 } 406 407 static void kvmppc_dump_regs(struct kvm_vcpu *vcpu) 408 { 409 int r; 410 411 pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id); 412 pr_err("pc = %.16lx msr = %.16llx trap = %x\n", 413 vcpu->arch.regs.nip, vcpu->arch.shregs.msr, vcpu->arch.trap); 414 for (r = 0; r < 16; ++r) 415 pr_err("r%2d = %.16lx r%d = %.16lx\n", 416 r, kvmppc_get_gpr(vcpu, r), 417 r+16, kvmppc_get_gpr(vcpu, r+16)); 418 pr_err("ctr = %.16lx lr = %.16lx\n", 419 vcpu->arch.regs.ctr, vcpu->arch.regs.link); 420 pr_err("srr0 = %.16llx srr1 = %.16llx\n", 421 vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1); 422 pr_err("sprg0 = %.16llx sprg1 = %.16llx\n", 423 vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1); 424 pr_err("sprg2 = %.16llx sprg3 = %.16llx\n", 425 vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3); 426 pr_err("cr = %.8lx xer = %.16lx dsisr = %.8x\n", 427 vcpu->arch.regs.ccr, vcpu->arch.regs.xer, vcpu->arch.shregs.dsisr); 428 pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar); 429 pr_err("fault dar = %.16lx dsisr = %.8x\n", 430 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); 431 pr_err("SLB (%d entries):\n", vcpu->arch.slb_max); 432 for (r = 0; r < vcpu->arch.slb_max; ++r) 433 pr_err(" ESID = %.16llx VSID = %.16llx\n", 434 vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv); 435 pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n", 436 vcpu->arch.vcore->lpcr, vcpu->kvm->arch.sdr1, 437 vcpu->arch.last_inst); 438 } 439 440 static struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id) 441 { 442 return kvm_get_vcpu_by_id(kvm, id); 443 } 444 445 static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa) 446 { 447 vpa->__old_status |= LPPACA_OLD_SHARED_PROC; 448 vpa->yield_count = cpu_to_be32(1); 449 } 450 451 static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v, 452 unsigned long addr, unsigned long len) 453 { 454 /* check address is cacheline aligned */ 455 if (addr & (L1_CACHE_BYTES - 1)) 456 return -EINVAL; 457 spin_lock(&vcpu->arch.vpa_update_lock); 458 if (v->next_gpa != addr || v->len != len) { 459 v->next_gpa = addr; 460 v->len = addr ? len : 0; 461 v->update_pending = 1; 462 } 463 spin_unlock(&vcpu->arch.vpa_update_lock); 464 return 0; 465 } 466 467 /* Length for a per-processor buffer is passed in at offset 4 in the buffer */ 468 struct reg_vpa { 469 u32 dummy; 470 union { 471 __be16 hword; 472 __be32 word; 473 } length; 474 }; 475 476 static int vpa_is_registered(struct kvmppc_vpa *vpap) 477 { 478 if (vpap->update_pending) 479 return vpap->next_gpa != 0; 480 return vpap->pinned_addr != NULL; 481 } 482 483 static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu, 484 unsigned long flags, 485 unsigned long vcpuid, unsigned long vpa) 486 { 487 struct kvm *kvm = vcpu->kvm; 488 unsigned long len, nb; 489 void *va; 490 struct kvm_vcpu *tvcpu; 491 int err; 492 int subfunc; 493 struct kvmppc_vpa *vpap; 494 495 tvcpu = kvmppc_find_vcpu(kvm, vcpuid); 496 if (!tvcpu) 497 return H_PARAMETER; 498 499 subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK; 500 if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL || 501 subfunc == H_VPA_REG_SLB) { 502 /* Registering new area - address must be cache-line aligned */ 503 if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa) 504 return H_PARAMETER; 505 506 /* convert logical addr to kernel addr and read length */ 507 va = kvmppc_pin_guest_page(kvm, vpa, &nb); 508 if (va == NULL) 509 return H_PARAMETER; 510 if (subfunc == H_VPA_REG_VPA) 511 len = be16_to_cpu(((struct reg_vpa *)va)->length.hword); 512 else 513 len = be32_to_cpu(((struct reg_vpa *)va)->length.word); 514 kvmppc_unpin_guest_page(kvm, va, vpa, false); 515 516 /* Check length */ 517 if (len > nb || len < sizeof(struct reg_vpa)) 518 return H_PARAMETER; 519 } else { 520 vpa = 0; 521 len = 0; 522 } 523 524 err = H_PARAMETER; 525 vpap = NULL; 526 spin_lock(&tvcpu->arch.vpa_update_lock); 527 528 switch (subfunc) { 529 case H_VPA_REG_VPA: /* register VPA */ 530 /* 531 * The size of our lppaca is 1kB because of the way we align 532 * it for the guest to avoid crossing a 4kB boundary. We only 533 * use 640 bytes of the structure though, so we should accept 534 * clients that set a size of 640. 535 */ 536 BUILD_BUG_ON(sizeof(struct lppaca) != 640); 537 if (len < sizeof(struct lppaca)) 538 break; 539 vpap = &tvcpu->arch.vpa; 540 err = 0; 541 break; 542 543 case H_VPA_REG_DTL: /* register DTL */ 544 if (len < sizeof(struct dtl_entry)) 545 break; 546 len -= len % sizeof(struct dtl_entry); 547 548 /* Check that they have previously registered a VPA */ 549 err = H_RESOURCE; 550 if (!vpa_is_registered(&tvcpu->arch.vpa)) 551 break; 552 553 vpap = &tvcpu->arch.dtl; 554 err = 0; 555 break; 556 557 case H_VPA_REG_SLB: /* register SLB shadow buffer */ 558 /* Check that they have previously registered a VPA */ 559 err = H_RESOURCE; 560 if (!vpa_is_registered(&tvcpu->arch.vpa)) 561 break; 562 563 vpap = &tvcpu->arch.slb_shadow; 564 err = 0; 565 break; 566 567 case H_VPA_DEREG_VPA: /* deregister VPA */ 568 /* Check they don't still have a DTL or SLB buf registered */ 569 err = H_RESOURCE; 570 if (vpa_is_registered(&tvcpu->arch.dtl) || 571 vpa_is_registered(&tvcpu->arch.slb_shadow)) 572 break; 573 574 vpap = &tvcpu->arch.vpa; 575 err = 0; 576 break; 577 578 case H_VPA_DEREG_DTL: /* deregister DTL */ 579 vpap = &tvcpu->arch.dtl; 580 err = 0; 581 break; 582 583 case H_VPA_DEREG_SLB: /* deregister SLB shadow buffer */ 584 vpap = &tvcpu->arch.slb_shadow; 585 err = 0; 586 break; 587 } 588 589 if (vpap) { 590 vpap->next_gpa = vpa; 591 vpap->len = len; 592 vpap->update_pending = 1; 593 } 594 595 spin_unlock(&tvcpu->arch.vpa_update_lock); 596 597 return err; 598 } 599 600 static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap) 601 { 602 struct kvm *kvm = vcpu->kvm; 603 void *va; 604 unsigned long nb; 605 unsigned long gpa; 606 607 /* 608 * We need to pin the page pointed to by vpap->next_gpa, 609 * but we can't call kvmppc_pin_guest_page under the lock 610 * as it does get_user_pages() and down_read(). So we 611 * have to drop the lock, pin the page, then get the lock 612 * again and check that a new area didn't get registered 613 * in the meantime. 614 */ 615 for (;;) { 616 gpa = vpap->next_gpa; 617 spin_unlock(&vcpu->arch.vpa_update_lock); 618 va = NULL; 619 nb = 0; 620 if (gpa) 621 va = kvmppc_pin_guest_page(kvm, gpa, &nb); 622 spin_lock(&vcpu->arch.vpa_update_lock); 623 if (gpa == vpap->next_gpa) 624 break; 625 /* sigh... unpin that one and try again */ 626 if (va) 627 kvmppc_unpin_guest_page(kvm, va, gpa, false); 628 } 629 630 vpap->update_pending = 0; 631 if (va && nb < vpap->len) { 632 /* 633 * If it's now too short, it must be that userspace 634 * has changed the mappings underlying guest memory, 635 * so unregister the region. 636 */ 637 kvmppc_unpin_guest_page(kvm, va, gpa, false); 638 va = NULL; 639 } 640 if (vpap->pinned_addr) 641 kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa, 642 vpap->dirty); 643 vpap->gpa = gpa; 644 vpap->pinned_addr = va; 645 vpap->dirty = false; 646 if (va) 647 vpap->pinned_end = va + vpap->len; 648 } 649 650 static void kvmppc_update_vpas(struct kvm_vcpu *vcpu) 651 { 652 if (!(vcpu->arch.vpa.update_pending || 653 vcpu->arch.slb_shadow.update_pending || 654 vcpu->arch.dtl.update_pending)) 655 return; 656 657 spin_lock(&vcpu->arch.vpa_update_lock); 658 if (vcpu->arch.vpa.update_pending) { 659 kvmppc_update_vpa(vcpu, &vcpu->arch.vpa); 660 if (vcpu->arch.vpa.pinned_addr) 661 init_vpa(vcpu, vcpu->arch.vpa.pinned_addr); 662 } 663 if (vcpu->arch.dtl.update_pending) { 664 kvmppc_update_vpa(vcpu, &vcpu->arch.dtl); 665 vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr; 666 vcpu->arch.dtl_index = 0; 667 } 668 if (vcpu->arch.slb_shadow.update_pending) 669 kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow); 670 spin_unlock(&vcpu->arch.vpa_update_lock); 671 } 672 673 /* 674 * Return the accumulated stolen time for the vcore up until `now'. 675 * The caller should hold the vcore lock. 676 */ 677 static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now) 678 { 679 u64 p; 680 unsigned long flags; 681 682 spin_lock_irqsave(&vc->stoltb_lock, flags); 683 p = vc->stolen_tb; 684 if (vc->vcore_state != VCORE_INACTIVE && 685 vc->preempt_tb != TB_NIL) 686 p += now - vc->preempt_tb; 687 spin_unlock_irqrestore(&vc->stoltb_lock, flags); 688 return p; 689 } 690 691 static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu, 692 struct kvmppc_vcore *vc) 693 { 694 struct dtl_entry *dt; 695 struct lppaca *vpa; 696 unsigned long stolen; 697 unsigned long core_stolen; 698 u64 now; 699 unsigned long flags; 700 701 dt = vcpu->arch.dtl_ptr; 702 vpa = vcpu->arch.vpa.pinned_addr; 703 now = mftb(); 704 core_stolen = vcore_stolen_time(vc, now); 705 stolen = core_stolen - vcpu->arch.stolen_logged; 706 vcpu->arch.stolen_logged = core_stolen; 707 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); 708 stolen += vcpu->arch.busy_stolen; 709 vcpu->arch.busy_stolen = 0; 710 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); 711 if (!dt || !vpa) 712 return; 713 memset(dt, 0, sizeof(struct dtl_entry)); 714 dt->dispatch_reason = 7; 715 dt->processor_id = cpu_to_be16(vc->pcpu + vcpu->arch.ptid); 716 dt->timebase = cpu_to_be64(now + vc->tb_offset); 717 dt->enqueue_to_dispatch_time = cpu_to_be32(stolen); 718 dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu)); 719 dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr); 720 ++dt; 721 if (dt == vcpu->arch.dtl.pinned_end) 722 dt = vcpu->arch.dtl.pinned_addr; 723 vcpu->arch.dtl_ptr = dt; 724 /* order writing *dt vs. writing vpa->dtl_idx */ 725 smp_wmb(); 726 vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index); 727 vcpu->arch.dtl.dirty = true; 728 } 729 730 /* See if there is a doorbell interrupt pending for a vcpu */ 731 static bool kvmppc_doorbell_pending(struct kvm_vcpu *vcpu) 732 { 733 int thr; 734 struct kvmppc_vcore *vc; 735 736 if (vcpu->arch.doorbell_request) 737 return true; 738 /* 739 * Ensure that the read of vcore->dpdes comes after the read 740 * of vcpu->doorbell_request. This barrier matches the 741 * smp_wmb() in kvmppc_guest_entry_inject(). 742 */ 743 smp_rmb(); 744 vc = vcpu->arch.vcore; 745 thr = vcpu->vcpu_id - vc->first_vcpuid; 746 return !!(vc->dpdes & (1 << thr)); 747 } 748 749 static bool kvmppc_power8_compatible(struct kvm_vcpu *vcpu) 750 { 751 if (vcpu->arch.vcore->arch_compat >= PVR_ARCH_207) 752 return true; 753 if ((!vcpu->arch.vcore->arch_compat) && 754 cpu_has_feature(CPU_FTR_ARCH_207S)) 755 return true; 756 return false; 757 } 758 759 static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags, 760 unsigned long resource, unsigned long value1, 761 unsigned long value2) 762 { 763 switch (resource) { 764 case H_SET_MODE_RESOURCE_SET_CIABR: 765 if (!kvmppc_power8_compatible(vcpu)) 766 return H_P2; 767 if (value2) 768 return H_P4; 769 if (mflags) 770 return H_UNSUPPORTED_FLAG_START; 771 /* Guests can't breakpoint the hypervisor */ 772 if ((value1 & CIABR_PRIV) == CIABR_PRIV_HYPER) 773 return H_P3; 774 vcpu->arch.ciabr = value1; 775 return H_SUCCESS; 776 case H_SET_MODE_RESOURCE_SET_DAWR0: 777 if (!kvmppc_power8_compatible(vcpu)) 778 return H_P2; 779 if (!ppc_breakpoint_available()) 780 return H_P2; 781 if (mflags) 782 return H_UNSUPPORTED_FLAG_START; 783 if (value2 & DABRX_HYP) 784 return H_P4; 785 vcpu->arch.dawr = value1; 786 vcpu->arch.dawrx = value2; 787 return H_SUCCESS; 788 case H_SET_MODE_RESOURCE_ADDR_TRANS_MODE: 789 /* KVM does not support mflags=2 (AIL=2) */ 790 if (mflags != 0 && mflags != 3) 791 return H_UNSUPPORTED_FLAG_START; 792 return H_TOO_HARD; 793 default: 794 return H_TOO_HARD; 795 } 796 } 797 798 /* Copy guest memory in place - must reside within a single memslot */ 799 static int kvmppc_copy_guest(struct kvm *kvm, gpa_t to, gpa_t from, 800 unsigned long len) 801 { 802 struct kvm_memory_slot *to_memslot = NULL; 803 struct kvm_memory_slot *from_memslot = NULL; 804 unsigned long to_addr, from_addr; 805 int r; 806 807 /* Get HPA for from address */ 808 from_memslot = gfn_to_memslot(kvm, from >> PAGE_SHIFT); 809 if (!from_memslot) 810 return -EFAULT; 811 if ((from + len) >= ((from_memslot->base_gfn + from_memslot->npages) 812 << PAGE_SHIFT)) 813 return -EINVAL; 814 from_addr = gfn_to_hva_memslot(from_memslot, from >> PAGE_SHIFT); 815 if (kvm_is_error_hva(from_addr)) 816 return -EFAULT; 817 from_addr |= (from & (PAGE_SIZE - 1)); 818 819 /* Get HPA for to address */ 820 to_memslot = gfn_to_memslot(kvm, to >> PAGE_SHIFT); 821 if (!to_memslot) 822 return -EFAULT; 823 if ((to + len) >= ((to_memslot->base_gfn + to_memslot->npages) 824 << PAGE_SHIFT)) 825 return -EINVAL; 826 to_addr = gfn_to_hva_memslot(to_memslot, to >> PAGE_SHIFT); 827 if (kvm_is_error_hva(to_addr)) 828 return -EFAULT; 829 to_addr |= (to & (PAGE_SIZE - 1)); 830 831 /* Perform copy */ 832 r = raw_copy_in_user((void __user *)to_addr, (void __user *)from_addr, 833 len); 834 if (r) 835 return -EFAULT; 836 mark_page_dirty(kvm, to >> PAGE_SHIFT); 837 return 0; 838 } 839 840 static long kvmppc_h_page_init(struct kvm_vcpu *vcpu, unsigned long flags, 841 unsigned long dest, unsigned long src) 842 { 843 u64 pg_sz = SZ_4K; /* 4K page size */ 844 u64 pg_mask = SZ_4K - 1; 845 int ret; 846 847 /* Check for invalid flags (H_PAGE_SET_LOANED covers all CMO flags) */ 848 if (flags & ~(H_ICACHE_INVALIDATE | H_ICACHE_SYNCHRONIZE | 849 H_ZERO_PAGE | H_COPY_PAGE | H_PAGE_SET_LOANED)) 850 return H_PARAMETER; 851 852 /* dest (and src if copy_page flag set) must be page aligned */ 853 if ((dest & pg_mask) || ((flags & H_COPY_PAGE) && (src & pg_mask))) 854 return H_PARAMETER; 855 856 /* zero and/or copy the page as determined by the flags */ 857 if (flags & H_COPY_PAGE) { 858 ret = kvmppc_copy_guest(vcpu->kvm, dest, src, pg_sz); 859 if (ret < 0) 860 return H_PARAMETER; 861 } else if (flags & H_ZERO_PAGE) { 862 ret = kvm_clear_guest(vcpu->kvm, dest, pg_sz); 863 if (ret < 0) 864 return H_PARAMETER; 865 } 866 867 /* We can ignore the remaining flags */ 868 869 return H_SUCCESS; 870 } 871 872 static int kvm_arch_vcpu_yield_to(struct kvm_vcpu *target) 873 { 874 struct kvmppc_vcore *vcore = target->arch.vcore; 875 876 /* 877 * We expect to have been called by the real mode handler 878 * (kvmppc_rm_h_confer()) which would have directly returned 879 * H_SUCCESS if the source vcore wasn't idle (e.g. if it may 880 * have useful work to do and should not confer) so we don't 881 * recheck that here. 882 */ 883 884 spin_lock(&vcore->lock); 885 if (target->arch.state == KVMPPC_VCPU_RUNNABLE && 886 vcore->vcore_state != VCORE_INACTIVE && 887 vcore->runner) 888 target = vcore->runner; 889 spin_unlock(&vcore->lock); 890 891 return kvm_vcpu_yield_to(target); 892 } 893 894 static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu) 895 { 896 int yield_count = 0; 897 struct lppaca *lppaca; 898 899 spin_lock(&vcpu->arch.vpa_update_lock); 900 lppaca = (struct lppaca *)vcpu->arch.vpa.pinned_addr; 901 if (lppaca) 902 yield_count = be32_to_cpu(lppaca->yield_count); 903 spin_unlock(&vcpu->arch.vpa_update_lock); 904 return yield_count; 905 } 906 907 int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu) 908 { 909 unsigned long req = kvmppc_get_gpr(vcpu, 3); 910 unsigned long target, ret = H_SUCCESS; 911 int yield_count; 912 struct kvm_vcpu *tvcpu; 913 int idx, rc; 914 915 if (req <= MAX_HCALL_OPCODE && 916 !test_bit(req/4, vcpu->kvm->arch.enabled_hcalls)) 917 return RESUME_HOST; 918 919 switch (req) { 920 case H_CEDE: 921 break; 922 case H_PROD: 923 target = kvmppc_get_gpr(vcpu, 4); 924 tvcpu = kvmppc_find_vcpu(vcpu->kvm, target); 925 if (!tvcpu) { 926 ret = H_PARAMETER; 927 break; 928 } 929 tvcpu->arch.prodded = 1; 930 smp_mb(); 931 if (tvcpu->arch.ceded) 932 kvmppc_fast_vcpu_kick_hv(tvcpu); 933 break; 934 case H_CONFER: 935 target = kvmppc_get_gpr(vcpu, 4); 936 if (target == -1) 937 break; 938 tvcpu = kvmppc_find_vcpu(vcpu->kvm, target); 939 if (!tvcpu) { 940 ret = H_PARAMETER; 941 break; 942 } 943 yield_count = kvmppc_get_gpr(vcpu, 5); 944 if (kvmppc_get_yield_count(tvcpu) != yield_count) 945 break; 946 kvm_arch_vcpu_yield_to(tvcpu); 947 break; 948 case H_REGISTER_VPA: 949 ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4), 950 kvmppc_get_gpr(vcpu, 5), 951 kvmppc_get_gpr(vcpu, 6)); 952 break; 953 case H_RTAS: 954 if (list_empty(&vcpu->kvm->arch.rtas_tokens)) 955 return RESUME_HOST; 956 957 idx = srcu_read_lock(&vcpu->kvm->srcu); 958 rc = kvmppc_rtas_hcall(vcpu); 959 srcu_read_unlock(&vcpu->kvm->srcu, idx); 960 961 if (rc == -ENOENT) 962 return RESUME_HOST; 963 else if (rc == 0) 964 break; 965 966 /* Send the error out to userspace via KVM_RUN */ 967 return rc; 968 case H_LOGICAL_CI_LOAD: 969 ret = kvmppc_h_logical_ci_load(vcpu); 970 if (ret == H_TOO_HARD) 971 return RESUME_HOST; 972 break; 973 case H_LOGICAL_CI_STORE: 974 ret = kvmppc_h_logical_ci_store(vcpu); 975 if (ret == H_TOO_HARD) 976 return RESUME_HOST; 977 break; 978 case H_SET_MODE: 979 ret = kvmppc_h_set_mode(vcpu, kvmppc_get_gpr(vcpu, 4), 980 kvmppc_get_gpr(vcpu, 5), 981 kvmppc_get_gpr(vcpu, 6), 982 kvmppc_get_gpr(vcpu, 7)); 983 if (ret == H_TOO_HARD) 984 return RESUME_HOST; 985 break; 986 case H_XIRR: 987 case H_CPPR: 988 case H_EOI: 989 case H_IPI: 990 case H_IPOLL: 991 case H_XIRR_X: 992 if (kvmppc_xics_enabled(vcpu)) { 993 if (xics_on_xive()) { 994 ret = H_NOT_AVAILABLE; 995 return RESUME_GUEST; 996 } 997 ret = kvmppc_xics_hcall(vcpu, req); 998 break; 999 } 1000 return RESUME_HOST; 1001 case H_SET_DABR: 1002 ret = kvmppc_h_set_dabr(vcpu, kvmppc_get_gpr(vcpu, 4)); 1003 break; 1004 case H_SET_XDABR: 1005 ret = kvmppc_h_set_xdabr(vcpu, kvmppc_get_gpr(vcpu, 4), 1006 kvmppc_get_gpr(vcpu, 5)); 1007 break; 1008 #ifdef CONFIG_SPAPR_TCE_IOMMU 1009 case H_GET_TCE: 1010 ret = kvmppc_h_get_tce(vcpu, kvmppc_get_gpr(vcpu, 4), 1011 kvmppc_get_gpr(vcpu, 5)); 1012 if (ret == H_TOO_HARD) 1013 return RESUME_HOST; 1014 break; 1015 case H_PUT_TCE: 1016 ret = kvmppc_h_put_tce(vcpu, kvmppc_get_gpr(vcpu, 4), 1017 kvmppc_get_gpr(vcpu, 5), 1018 kvmppc_get_gpr(vcpu, 6)); 1019 if (ret == H_TOO_HARD) 1020 return RESUME_HOST; 1021 break; 1022 case H_PUT_TCE_INDIRECT: 1023 ret = kvmppc_h_put_tce_indirect(vcpu, kvmppc_get_gpr(vcpu, 4), 1024 kvmppc_get_gpr(vcpu, 5), 1025 kvmppc_get_gpr(vcpu, 6), 1026 kvmppc_get_gpr(vcpu, 7)); 1027 if (ret == H_TOO_HARD) 1028 return RESUME_HOST; 1029 break; 1030 case H_STUFF_TCE: 1031 ret = kvmppc_h_stuff_tce(vcpu, kvmppc_get_gpr(vcpu, 4), 1032 kvmppc_get_gpr(vcpu, 5), 1033 kvmppc_get_gpr(vcpu, 6), 1034 kvmppc_get_gpr(vcpu, 7)); 1035 if (ret == H_TOO_HARD) 1036 return RESUME_HOST; 1037 break; 1038 #endif 1039 case H_RANDOM: 1040 if (!powernv_get_random_long(&vcpu->arch.regs.gpr[4])) 1041 ret = H_HARDWARE; 1042 break; 1043 1044 case H_SET_PARTITION_TABLE: 1045 ret = H_FUNCTION; 1046 if (nesting_enabled(vcpu->kvm)) 1047 ret = kvmhv_set_partition_table(vcpu); 1048 break; 1049 case H_ENTER_NESTED: 1050 ret = H_FUNCTION; 1051 if (!nesting_enabled(vcpu->kvm)) 1052 break; 1053 ret = kvmhv_enter_nested_guest(vcpu); 1054 if (ret == H_INTERRUPT) { 1055 kvmppc_set_gpr(vcpu, 3, 0); 1056 vcpu->arch.hcall_needed = 0; 1057 return -EINTR; 1058 } else if (ret == H_TOO_HARD) { 1059 kvmppc_set_gpr(vcpu, 3, 0); 1060 vcpu->arch.hcall_needed = 0; 1061 return RESUME_HOST; 1062 } 1063 break; 1064 case H_TLB_INVALIDATE: 1065 ret = H_FUNCTION; 1066 if (nesting_enabled(vcpu->kvm)) 1067 ret = kvmhv_do_nested_tlbie(vcpu); 1068 break; 1069 case H_COPY_TOFROM_GUEST: 1070 ret = H_FUNCTION; 1071 if (nesting_enabled(vcpu->kvm)) 1072 ret = kvmhv_copy_tofrom_guest_nested(vcpu); 1073 break; 1074 case H_PAGE_INIT: 1075 ret = kvmppc_h_page_init(vcpu, kvmppc_get_gpr(vcpu, 4), 1076 kvmppc_get_gpr(vcpu, 5), 1077 kvmppc_get_gpr(vcpu, 6)); 1078 break; 1079 case H_SVM_PAGE_IN: 1080 ret = H_UNSUPPORTED; 1081 if (kvmppc_get_srr1(vcpu) & MSR_S) 1082 ret = kvmppc_h_svm_page_in(vcpu->kvm, 1083 kvmppc_get_gpr(vcpu, 4), 1084 kvmppc_get_gpr(vcpu, 5), 1085 kvmppc_get_gpr(vcpu, 6)); 1086 break; 1087 case H_SVM_PAGE_OUT: 1088 ret = H_UNSUPPORTED; 1089 if (kvmppc_get_srr1(vcpu) & MSR_S) 1090 ret = kvmppc_h_svm_page_out(vcpu->kvm, 1091 kvmppc_get_gpr(vcpu, 4), 1092 kvmppc_get_gpr(vcpu, 5), 1093 kvmppc_get_gpr(vcpu, 6)); 1094 break; 1095 case H_SVM_INIT_START: 1096 ret = H_UNSUPPORTED; 1097 if (kvmppc_get_srr1(vcpu) & MSR_S) 1098 ret = kvmppc_h_svm_init_start(vcpu->kvm); 1099 break; 1100 case H_SVM_INIT_DONE: 1101 ret = H_UNSUPPORTED; 1102 if (kvmppc_get_srr1(vcpu) & MSR_S) 1103 ret = kvmppc_h_svm_init_done(vcpu->kvm); 1104 break; 1105 case H_SVM_INIT_ABORT: 1106 /* 1107 * Even if that call is made by the Ultravisor, the SSR1 value 1108 * is the guest context one, with the secure bit clear as it has 1109 * not yet been secured. So we can't check it here. 1110 * Instead the kvm->arch.secure_guest flag is checked inside 1111 * kvmppc_h_svm_init_abort(). 1112 */ 1113 ret = kvmppc_h_svm_init_abort(vcpu->kvm); 1114 break; 1115 1116 default: 1117 return RESUME_HOST; 1118 } 1119 kvmppc_set_gpr(vcpu, 3, ret); 1120 vcpu->arch.hcall_needed = 0; 1121 return RESUME_GUEST; 1122 } 1123 1124 /* 1125 * Handle H_CEDE in the nested virtualization case where we haven't 1126 * called the real-mode hcall handlers in book3s_hv_rmhandlers.S. 1127 * This has to be done early, not in kvmppc_pseries_do_hcall(), so 1128 * that the cede logic in kvmppc_run_single_vcpu() works properly. 1129 */ 1130 static void kvmppc_nested_cede(struct kvm_vcpu *vcpu) 1131 { 1132 vcpu->arch.shregs.msr |= MSR_EE; 1133 vcpu->arch.ceded = 1; 1134 smp_mb(); 1135 if (vcpu->arch.prodded) { 1136 vcpu->arch.prodded = 0; 1137 smp_mb(); 1138 vcpu->arch.ceded = 0; 1139 } 1140 } 1141 1142 static int kvmppc_hcall_impl_hv(unsigned long cmd) 1143 { 1144 switch (cmd) { 1145 case H_CEDE: 1146 case H_PROD: 1147 case H_CONFER: 1148 case H_REGISTER_VPA: 1149 case H_SET_MODE: 1150 case H_LOGICAL_CI_LOAD: 1151 case H_LOGICAL_CI_STORE: 1152 #ifdef CONFIG_KVM_XICS 1153 case H_XIRR: 1154 case H_CPPR: 1155 case H_EOI: 1156 case H_IPI: 1157 case H_IPOLL: 1158 case H_XIRR_X: 1159 #endif 1160 case H_PAGE_INIT: 1161 return 1; 1162 } 1163 1164 /* See if it's in the real-mode table */ 1165 return kvmppc_hcall_impl_hv_realmode(cmd); 1166 } 1167 1168 static int kvmppc_emulate_debug_inst(struct kvm_vcpu *vcpu) 1169 { 1170 u32 last_inst; 1171 1172 if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) != 1173 EMULATE_DONE) { 1174 /* 1175 * Fetch failed, so return to guest and 1176 * try executing it again. 1177 */ 1178 return RESUME_GUEST; 1179 } 1180 1181 if (last_inst == KVMPPC_INST_SW_BREAKPOINT) { 1182 vcpu->run->exit_reason = KVM_EXIT_DEBUG; 1183 vcpu->run->debug.arch.address = kvmppc_get_pc(vcpu); 1184 return RESUME_HOST; 1185 } else { 1186 kvmppc_core_queue_program(vcpu, SRR1_PROGILL); 1187 return RESUME_GUEST; 1188 } 1189 } 1190 1191 static void do_nothing(void *x) 1192 { 1193 } 1194 1195 static unsigned long kvmppc_read_dpdes(struct kvm_vcpu *vcpu) 1196 { 1197 int thr, cpu, pcpu, nthreads; 1198 struct kvm_vcpu *v; 1199 unsigned long dpdes; 1200 1201 nthreads = vcpu->kvm->arch.emul_smt_mode; 1202 dpdes = 0; 1203 cpu = vcpu->vcpu_id & ~(nthreads - 1); 1204 for (thr = 0; thr < nthreads; ++thr, ++cpu) { 1205 v = kvmppc_find_vcpu(vcpu->kvm, cpu); 1206 if (!v) 1207 continue; 1208 /* 1209 * If the vcpu is currently running on a physical cpu thread, 1210 * interrupt it in order to pull it out of the guest briefly, 1211 * which will update its vcore->dpdes value. 1212 */ 1213 pcpu = READ_ONCE(v->cpu); 1214 if (pcpu >= 0) 1215 smp_call_function_single(pcpu, do_nothing, NULL, 1); 1216 if (kvmppc_doorbell_pending(v)) 1217 dpdes |= 1 << thr; 1218 } 1219 return dpdes; 1220 } 1221 1222 /* 1223 * On POWER9, emulate doorbell-related instructions in order to 1224 * give the guest the illusion of running on a multi-threaded core. 1225 * The instructions emulated are msgsndp, msgclrp, mfspr TIR, 1226 * and mfspr DPDES. 1227 */ 1228 static int kvmppc_emulate_doorbell_instr(struct kvm_vcpu *vcpu) 1229 { 1230 u32 inst, rb, thr; 1231 unsigned long arg; 1232 struct kvm *kvm = vcpu->kvm; 1233 struct kvm_vcpu *tvcpu; 1234 1235 if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &inst) != EMULATE_DONE) 1236 return RESUME_GUEST; 1237 if (get_op(inst) != 31) 1238 return EMULATE_FAIL; 1239 rb = get_rb(inst); 1240 thr = vcpu->vcpu_id & (kvm->arch.emul_smt_mode - 1); 1241 switch (get_xop(inst)) { 1242 case OP_31_XOP_MSGSNDP: 1243 arg = kvmppc_get_gpr(vcpu, rb); 1244 if (((arg >> 27) & 0xf) != PPC_DBELL_SERVER) 1245 break; 1246 arg &= 0x3f; 1247 if (arg >= kvm->arch.emul_smt_mode) 1248 break; 1249 tvcpu = kvmppc_find_vcpu(kvm, vcpu->vcpu_id - thr + arg); 1250 if (!tvcpu) 1251 break; 1252 if (!tvcpu->arch.doorbell_request) { 1253 tvcpu->arch.doorbell_request = 1; 1254 kvmppc_fast_vcpu_kick_hv(tvcpu); 1255 } 1256 break; 1257 case OP_31_XOP_MSGCLRP: 1258 arg = kvmppc_get_gpr(vcpu, rb); 1259 if (((arg >> 27) & 0xf) != PPC_DBELL_SERVER) 1260 break; 1261 vcpu->arch.vcore->dpdes = 0; 1262 vcpu->arch.doorbell_request = 0; 1263 break; 1264 case OP_31_XOP_MFSPR: 1265 switch (get_sprn(inst)) { 1266 case SPRN_TIR: 1267 arg = thr; 1268 break; 1269 case SPRN_DPDES: 1270 arg = kvmppc_read_dpdes(vcpu); 1271 break; 1272 default: 1273 return EMULATE_FAIL; 1274 } 1275 kvmppc_set_gpr(vcpu, get_rt(inst), arg); 1276 break; 1277 default: 1278 return EMULATE_FAIL; 1279 } 1280 kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4); 1281 return RESUME_GUEST; 1282 } 1283 1284 static int kvmppc_handle_exit_hv(struct kvm_vcpu *vcpu, 1285 struct task_struct *tsk) 1286 { 1287 struct kvm_run *run = vcpu->run; 1288 int r = RESUME_HOST; 1289 1290 vcpu->stat.sum_exits++; 1291 1292 /* 1293 * This can happen if an interrupt occurs in the last stages 1294 * of guest entry or the first stages of guest exit (i.e. after 1295 * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV 1296 * and before setting it to KVM_GUEST_MODE_HOST_HV). 1297 * That can happen due to a bug, or due to a machine check 1298 * occurring at just the wrong time. 1299 */ 1300 if (vcpu->arch.shregs.msr & MSR_HV) { 1301 printk(KERN_EMERG "KVM trap in HV mode!\n"); 1302 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n", 1303 vcpu->arch.trap, kvmppc_get_pc(vcpu), 1304 vcpu->arch.shregs.msr); 1305 kvmppc_dump_regs(vcpu); 1306 run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 1307 run->hw.hardware_exit_reason = vcpu->arch.trap; 1308 return RESUME_HOST; 1309 } 1310 run->exit_reason = KVM_EXIT_UNKNOWN; 1311 run->ready_for_interrupt_injection = 1; 1312 switch (vcpu->arch.trap) { 1313 /* We're good on these - the host merely wanted to get our attention */ 1314 case BOOK3S_INTERRUPT_HV_DECREMENTER: 1315 vcpu->stat.dec_exits++; 1316 r = RESUME_GUEST; 1317 break; 1318 case BOOK3S_INTERRUPT_EXTERNAL: 1319 case BOOK3S_INTERRUPT_H_DOORBELL: 1320 case BOOK3S_INTERRUPT_H_VIRT: 1321 vcpu->stat.ext_intr_exits++; 1322 r = RESUME_GUEST; 1323 break; 1324 /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/ 1325 case BOOK3S_INTERRUPT_HMI: 1326 case BOOK3S_INTERRUPT_PERFMON: 1327 case BOOK3S_INTERRUPT_SYSTEM_RESET: 1328 r = RESUME_GUEST; 1329 break; 1330 case BOOK3S_INTERRUPT_MACHINE_CHECK: 1331 /* Print the MCE event to host console. */ 1332 machine_check_print_event_info(&vcpu->arch.mce_evt, false, true); 1333 1334 /* 1335 * If the guest can do FWNMI, exit to userspace so it can 1336 * deliver a FWNMI to the guest. 1337 * Otherwise we synthesize a machine check for the guest 1338 * so that it knows that the machine check occurred. 1339 */ 1340 if (!vcpu->kvm->arch.fwnmi_enabled) { 1341 ulong flags = vcpu->arch.shregs.msr & 0x083c0000; 1342 kvmppc_core_queue_machine_check(vcpu, flags); 1343 r = RESUME_GUEST; 1344 break; 1345 } 1346 1347 /* Exit to guest with KVM_EXIT_NMI as exit reason */ 1348 run->exit_reason = KVM_EXIT_NMI; 1349 run->hw.hardware_exit_reason = vcpu->arch.trap; 1350 /* Clear out the old NMI status from run->flags */ 1351 run->flags &= ~KVM_RUN_PPC_NMI_DISP_MASK; 1352 /* Now set the NMI status */ 1353 if (vcpu->arch.mce_evt.disposition == MCE_DISPOSITION_RECOVERED) 1354 run->flags |= KVM_RUN_PPC_NMI_DISP_FULLY_RECOV; 1355 else 1356 run->flags |= KVM_RUN_PPC_NMI_DISP_NOT_RECOV; 1357 1358 r = RESUME_HOST; 1359 break; 1360 case BOOK3S_INTERRUPT_PROGRAM: 1361 { 1362 ulong flags; 1363 /* 1364 * Normally program interrupts are delivered directly 1365 * to the guest by the hardware, but we can get here 1366 * as a result of a hypervisor emulation interrupt 1367 * (e40) getting turned into a 700 by BML RTAS. 1368 */ 1369 flags = vcpu->arch.shregs.msr & 0x1f0000ull; 1370 kvmppc_core_queue_program(vcpu, flags); 1371 r = RESUME_GUEST; 1372 break; 1373 } 1374 case BOOK3S_INTERRUPT_SYSCALL: 1375 { 1376 /* hcall - punt to userspace */ 1377 int i; 1378 1379 /* hypercall with MSR_PR has already been handled in rmode, 1380 * and never reaches here. 1381 */ 1382 1383 run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3); 1384 for (i = 0; i < 9; ++i) 1385 run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i); 1386 run->exit_reason = KVM_EXIT_PAPR_HCALL; 1387 vcpu->arch.hcall_needed = 1; 1388 r = RESUME_HOST; 1389 break; 1390 } 1391 /* 1392 * We get these next two if the guest accesses a page which it thinks 1393 * it has mapped but which is not actually present, either because 1394 * it is for an emulated I/O device or because the corresonding 1395 * host page has been paged out. Any other HDSI/HISI interrupts 1396 * have been handled already. 1397 */ 1398 case BOOK3S_INTERRUPT_H_DATA_STORAGE: 1399 r = RESUME_PAGE_FAULT; 1400 break; 1401 case BOOK3S_INTERRUPT_H_INST_STORAGE: 1402 vcpu->arch.fault_dar = kvmppc_get_pc(vcpu); 1403 vcpu->arch.fault_dsisr = vcpu->arch.shregs.msr & 1404 DSISR_SRR1_MATCH_64S; 1405 if (vcpu->arch.shregs.msr & HSRR1_HISI_WRITE) 1406 vcpu->arch.fault_dsisr |= DSISR_ISSTORE; 1407 r = RESUME_PAGE_FAULT; 1408 break; 1409 /* 1410 * This occurs if the guest executes an illegal instruction. 1411 * If the guest debug is disabled, generate a program interrupt 1412 * to the guest. If guest debug is enabled, we need to check 1413 * whether the instruction is a software breakpoint instruction. 1414 * Accordingly return to Guest or Host. 1415 */ 1416 case BOOK3S_INTERRUPT_H_EMUL_ASSIST: 1417 if (vcpu->arch.emul_inst != KVM_INST_FETCH_FAILED) 1418 vcpu->arch.last_inst = kvmppc_need_byteswap(vcpu) ? 1419 swab32(vcpu->arch.emul_inst) : 1420 vcpu->arch.emul_inst; 1421 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) { 1422 r = kvmppc_emulate_debug_inst(vcpu); 1423 } else { 1424 kvmppc_core_queue_program(vcpu, SRR1_PROGILL); 1425 r = RESUME_GUEST; 1426 } 1427 break; 1428 /* 1429 * This occurs if the guest (kernel or userspace), does something that 1430 * is prohibited by HFSCR. 1431 * On POWER9, this could be a doorbell instruction that we need 1432 * to emulate. 1433 * Otherwise, we just generate a program interrupt to the guest. 1434 */ 1435 case BOOK3S_INTERRUPT_H_FAC_UNAVAIL: 1436 r = EMULATE_FAIL; 1437 if (((vcpu->arch.hfscr >> 56) == FSCR_MSGP_LG) && 1438 cpu_has_feature(CPU_FTR_ARCH_300)) 1439 r = kvmppc_emulate_doorbell_instr(vcpu); 1440 if (r == EMULATE_FAIL) { 1441 kvmppc_core_queue_program(vcpu, SRR1_PROGILL); 1442 r = RESUME_GUEST; 1443 } 1444 break; 1445 1446 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 1447 case BOOK3S_INTERRUPT_HV_SOFTPATCH: 1448 /* 1449 * This occurs for various TM-related instructions that 1450 * we need to emulate on POWER9 DD2.2. We have already 1451 * handled the cases where the guest was in real-suspend 1452 * mode and was transitioning to transactional state. 1453 */ 1454 r = kvmhv_p9_tm_emulation(vcpu); 1455 break; 1456 #endif 1457 1458 case BOOK3S_INTERRUPT_HV_RM_HARD: 1459 r = RESUME_PASSTHROUGH; 1460 break; 1461 default: 1462 kvmppc_dump_regs(vcpu); 1463 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n", 1464 vcpu->arch.trap, kvmppc_get_pc(vcpu), 1465 vcpu->arch.shregs.msr); 1466 run->hw.hardware_exit_reason = vcpu->arch.trap; 1467 r = RESUME_HOST; 1468 break; 1469 } 1470 1471 return r; 1472 } 1473 1474 static int kvmppc_handle_nested_exit(struct kvm_vcpu *vcpu) 1475 { 1476 int r; 1477 int srcu_idx; 1478 1479 vcpu->stat.sum_exits++; 1480 1481 /* 1482 * This can happen if an interrupt occurs in the last stages 1483 * of guest entry or the first stages of guest exit (i.e. after 1484 * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV 1485 * and before setting it to KVM_GUEST_MODE_HOST_HV). 1486 * That can happen due to a bug, or due to a machine check 1487 * occurring at just the wrong time. 1488 */ 1489 if (vcpu->arch.shregs.msr & MSR_HV) { 1490 pr_emerg("KVM trap in HV mode while nested!\n"); 1491 pr_emerg("trap=0x%x | pc=0x%lx | msr=0x%llx\n", 1492 vcpu->arch.trap, kvmppc_get_pc(vcpu), 1493 vcpu->arch.shregs.msr); 1494 kvmppc_dump_regs(vcpu); 1495 return RESUME_HOST; 1496 } 1497 switch (vcpu->arch.trap) { 1498 /* We're good on these - the host merely wanted to get our attention */ 1499 case BOOK3S_INTERRUPT_HV_DECREMENTER: 1500 vcpu->stat.dec_exits++; 1501 r = RESUME_GUEST; 1502 break; 1503 case BOOK3S_INTERRUPT_EXTERNAL: 1504 vcpu->stat.ext_intr_exits++; 1505 r = RESUME_HOST; 1506 break; 1507 case BOOK3S_INTERRUPT_H_DOORBELL: 1508 case BOOK3S_INTERRUPT_H_VIRT: 1509 vcpu->stat.ext_intr_exits++; 1510 r = RESUME_GUEST; 1511 break; 1512 /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/ 1513 case BOOK3S_INTERRUPT_HMI: 1514 case BOOK3S_INTERRUPT_PERFMON: 1515 case BOOK3S_INTERRUPT_SYSTEM_RESET: 1516 r = RESUME_GUEST; 1517 break; 1518 case BOOK3S_INTERRUPT_MACHINE_CHECK: 1519 /* Pass the machine check to the L1 guest */ 1520 r = RESUME_HOST; 1521 /* Print the MCE event to host console. */ 1522 machine_check_print_event_info(&vcpu->arch.mce_evt, false, true); 1523 break; 1524 /* 1525 * We get these next two if the guest accesses a page which it thinks 1526 * it has mapped but which is not actually present, either because 1527 * it is for an emulated I/O device or because the corresonding 1528 * host page has been paged out. 1529 */ 1530 case BOOK3S_INTERRUPT_H_DATA_STORAGE: 1531 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 1532 r = kvmhv_nested_page_fault(vcpu); 1533 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 1534 break; 1535 case BOOK3S_INTERRUPT_H_INST_STORAGE: 1536 vcpu->arch.fault_dar = kvmppc_get_pc(vcpu); 1537 vcpu->arch.fault_dsisr = kvmppc_get_msr(vcpu) & 1538 DSISR_SRR1_MATCH_64S; 1539 if (vcpu->arch.shregs.msr & HSRR1_HISI_WRITE) 1540 vcpu->arch.fault_dsisr |= DSISR_ISSTORE; 1541 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 1542 r = kvmhv_nested_page_fault(vcpu); 1543 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 1544 break; 1545 1546 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 1547 case BOOK3S_INTERRUPT_HV_SOFTPATCH: 1548 /* 1549 * This occurs for various TM-related instructions that 1550 * we need to emulate on POWER9 DD2.2. We have already 1551 * handled the cases where the guest was in real-suspend 1552 * mode and was transitioning to transactional state. 1553 */ 1554 r = kvmhv_p9_tm_emulation(vcpu); 1555 break; 1556 #endif 1557 1558 case BOOK3S_INTERRUPT_HV_RM_HARD: 1559 vcpu->arch.trap = 0; 1560 r = RESUME_GUEST; 1561 if (!xics_on_xive()) 1562 kvmppc_xics_rm_complete(vcpu, 0); 1563 break; 1564 default: 1565 r = RESUME_HOST; 1566 break; 1567 } 1568 1569 return r; 1570 } 1571 1572 static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu, 1573 struct kvm_sregs *sregs) 1574 { 1575 int i; 1576 1577 memset(sregs, 0, sizeof(struct kvm_sregs)); 1578 sregs->pvr = vcpu->arch.pvr; 1579 for (i = 0; i < vcpu->arch.slb_max; i++) { 1580 sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige; 1581 sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv; 1582 } 1583 1584 return 0; 1585 } 1586 1587 static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu, 1588 struct kvm_sregs *sregs) 1589 { 1590 int i, j; 1591 1592 /* Only accept the same PVR as the host's, since we can't spoof it */ 1593 if (sregs->pvr != vcpu->arch.pvr) 1594 return -EINVAL; 1595 1596 j = 0; 1597 for (i = 0; i < vcpu->arch.slb_nr; i++) { 1598 if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) { 1599 vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe; 1600 vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv; 1601 ++j; 1602 } 1603 } 1604 vcpu->arch.slb_max = j; 1605 1606 return 0; 1607 } 1608 1609 static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr, 1610 bool preserve_top32) 1611 { 1612 struct kvm *kvm = vcpu->kvm; 1613 struct kvmppc_vcore *vc = vcpu->arch.vcore; 1614 u64 mask; 1615 1616 spin_lock(&vc->lock); 1617 /* 1618 * If ILE (interrupt little-endian) has changed, update the 1619 * MSR_LE bit in the intr_msr for each vcpu in this vcore. 1620 */ 1621 if ((new_lpcr & LPCR_ILE) != (vc->lpcr & LPCR_ILE)) { 1622 struct kvm_vcpu *vcpu; 1623 int i; 1624 1625 kvm_for_each_vcpu(i, vcpu, kvm) { 1626 if (vcpu->arch.vcore != vc) 1627 continue; 1628 if (new_lpcr & LPCR_ILE) 1629 vcpu->arch.intr_msr |= MSR_LE; 1630 else 1631 vcpu->arch.intr_msr &= ~MSR_LE; 1632 } 1633 } 1634 1635 /* 1636 * Userspace can only modify DPFD (default prefetch depth), 1637 * ILE (interrupt little-endian) and TC (translation control). 1638 * On POWER8 and POWER9 userspace can also modify AIL (alt. interrupt loc.). 1639 */ 1640 mask = LPCR_DPFD | LPCR_ILE | LPCR_TC; 1641 if (cpu_has_feature(CPU_FTR_ARCH_207S)) 1642 mask |= LPCR_AIL; 1643 /* 1644 * On POWER9, allow userspace to enable large decrementer for the 1645 * guest, whether or not the host has it enabled. 1646 */ 1647 if (cpu_has_feature(CPU_FTR_ARCH_300)) 1648 mask |= LPCR_LD; 1649 1650 /* Broken 32-bit version of LPCR must not clear top bits */ 1651 if (preserve_top32) 1652 mask &= 0xFFFFFFFF; 1653 vc->lpcr = (vc->lpcr & ~mask) | (new_lpcr & mask); 1654 spin_unlock(&vc->lock); 1655 } 1656 1657 static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, 1658 union kvmppc_one_reg *val) 1659 { 1660 int r = 0; 1661 long int i; 1662 1663 switch (id) { 1664 case KVM_REG_PPC_DEBUG_INST: 1665 *val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT); 1666 break; 1667 case KVM_REG_PPC_HIOR: 1668 *val = get_reg_val(id, 0); 1669 break; 1670 case KVM_REG_PPC_DABR: 1671 *val = get_reg_val(id, vcpu->arch.dabr); 1672 break; 1673 case KVM_REG_PPC_DABRX: 1674 *val = get_reg_val(id, vcpu->arch.dabrx); 1675 break; 1676 case KVM_REG_PPC_DSCR: 1677 *val = get_reg_val(id, vcpu->arch.dscr); 1678 break; 1679 case KVM_REG_PPC_PURR: 1680 *val = get_reg_val(id, vcpu->arch.purr); 1681 break; 1682 case KVM_REG_PPC_SPURR: 1683 *val = get_reg_val(id, vcpu->arch.spurr); 1684 break; 1685 case KVM_REG_PPC_AMR: 1686 *val = get_reg_val(id, vcpu->arch.amr); 1687 break; 1688 case KVM_REG_PPC_UAMOR: 1689 *val = get_reg_val(id, vcpu->arch.uamor); 1690 break; 1691 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCR1: 1692 i = id - KVM_REG_PPC_MMCR0; 1693 *val = get_reg_val(id, vcpu->arch.mmcr[i]); 1694 break; 1695 case KVM_REG_PPC_MMCR2: 1696 *val = get_reg_val(id, vcpu->arch.mmcr[2]); 1697 break; 1698 case KVM_REG_PPC_MMCRA: 1699 *val = get_reg_val(id, vcpu->arch.mmcra); 1700 break; 1701 case KVM_REG_PPC_MMCRS: 1702 *val = get_reg_val(id, vcpu->arch.mmcrs); 1703 break; 1704 case KVM_REG_PPC_MMCR3: 1705 *val = get_reg_val(id, vcpu->arch.mmcr[3]); 1706 break; 1707 case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8: 1708 i = id - KVM_REG_PPC_PMC1; 1709 *val = get_reg_val(id, vcpu->arch.pmc[i]); 1710 break; 1711 case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2: 1712 i = id - KVM_REG_PPC_SPMC1; 1713 *val = get_reg_val(id, vcpu->arch.spmc[i]); 1714 break; 1715 case KVM_REG_PPC_SIAR: 1716 *val = get_reg_val(id, vcpu->arch.siar); 1717 break; 1718 case KVM_REG_PPC_SDAR: 1719 *val = get_reg_val(id, vcpu->arch.sdar); 1720 break; 1721 case KVM_REG_PPC_SIER: 1722 *val = get_reg_val(id, vcpu->arch.sier[0]); 1723 break; 1724 case KVM_REG_PPC_SIER2: 1725 *val = get_reg_val(id, vcpu->arch.sier[1]); 1726 break; 1727 case KVM_REG_PPC_SIER3: 1728 *val = get_reg_val(id, vcpu->arch.sier[2]); 1729 break; 1730 case KVM_REG_PPC_IAMR: 1731 *val = get_reg_val(id, vcpu->arch.iamr); 1732 break; 1733 case KVM_REG_PPC_PSPB: 1734 *val = get_reg_val(id, vcpu->arch.pspb); 1735 break; 1736 case KVM_REG_PPC_DPDES: 1737 /* 1738 * On POWER9, where we are emulating msgsndp etc., 1739 * we return 1 bit for each vcpu, which can come from 1740 * either vcore->dpdes or doorbell_request. 1741 * On POWER8, doorbell_request is 0. 1742 */ 1743 *val = get_reg_val(id, vcpu->arch.vcore->dpdes | 1744 vcpu->arch.doorbell_request); 1745 break; 1746 case KVM_REG_PPC_VTB: 1747 *val = get_reg_val(id, vcpu->arch.vcore->vtb); 1748 break; 1749 case KVM_REG_PPC_DAWR: 1750 *val = get_reg_val(id, vcpu->arch.dawr); 1751 break; 1752 case KVM_REG_PPC_DAWRX: 1753 *val = get_reg_val(id, vcpu->arch.dawrx); 1754 break; 1755 case KVM_REG_PPC_CIABR: 1756 *val = get_reg_val(id, vcpu->arch.ciabr); 1757 break; 1758 case KVM_REG_PPC_CSIGR: 1759 *val = get_reg_val(id, vcpu->arch.csigr); 1760 break; 1761 case KVM_REG_PPC_TACR: 1762 *val = get_reg_val(id, vcpu->arch.tacr); 1763 break; 1764 case KVM_REG_PPC_TCSCR: 1765 *val = get_reg_val(id, vcpu->arch.tcscr); 1766 break; 1767 case KVM_REG_PPC_PID: 1768 *val = get_reg_val(id, vcpu->arch.pid); 1769 break; 1770 case KVM_REG_PPC_ACOP: 1771 *val = get_reg_val(id, vcpu->arch.acop); 1772 break; 1773 case KVM_REG_PPC_WORT: 1774 *val = get_reg_val(id, vcpu->arch.wort); 1775 break; 1776 case KVM_REG_PPC_TIDR: 1777 *val = get_reg_val(id, vcpu->arch.tid); 1778 break; 1779 case KVM_REG_PPC_PSSCR: 1780 *val = get_reg_val(id, vcpu->arch.psscr); 1781 break; 1782 case KVM_REG_PPC_VPA_ADDR: 1783 spin_lock(&vcpu->arch.vpa_update_lock); 1784 *val = get_reg_val(id, vcpu->arch.vpa.next_gpa); 1785 spin_unlock(&vcpu->arch.vpa_update_lock); 1786 break; 1787 case KVM_REG_PPC_VPA_SLB: 1788 spin_lock(&vcpu->arch.vpa_update_lock); 1789 val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa; 1790 val->vpaval.length = vcpu->arch.slb_shadow.len; 1791 spin_unlock(&vcpu->arch.vpa_update_lock); 1792 break; 1793 case KVM_REG_PPC_VPA_DTL: 1794 spin_lock(&vcpu->arch.vpa_update_lock); 1795 val->vpaval.addr = vcpu->arch.dtl.next_gpa; 1796 val->vpaval.length = vcpu->arch.dtl.len; 1797 spin_unlock(&vcpu->arch.vpa_update_lock); 1798 break; 1799 case KVM_REG_PPC_TB_OFFSET: 1800 *val = get_reg_val(id, vcpu->arch.vcore->tb_offset); 1801 break; 1802 case KVM_REG_PPC_LPCR: 1803 case KVM_REG_PPC_LPCR_64: 1804 *val = get_reg_val(id, vcpu->arch.vcore->lpcr); 1805 break; 1806 case KVM_REG_PPC_PPR: 1807 *val = get_reg_val(id, vcpu->arch.ppr); 1808 break; 1809 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 1810 case KVM_REG_PPC_TFHAR: 1811 *val = get_reg_val(id, vcpu->arch.tfhar); 1812 break; 1813 case KVM_REG_PPC_TFIAR: 1814 *val = get_reg_val(id, vcpu->arch.tfiar); 1815 break; 1816 case KVM_REG_PPC_TEXASR: 1817 *val = get_reg_val(id, vcpu->arch.texasr); 1818 break; 1819 case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31: 1820 i = id - KVM_REG_PPC_TM_GPR0; 1821 *val = get_reg_val(id, vcpu->arch.gpr_tm[i]); 1822 break; 1823 case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63: 1824 { 1825 int j; 1826 i = id - KVM_REG_PPC_TM_VSR0; 1827 if (i < 32) 1828 for (j = 0; j < TS_FPRWIDTH; j++) 1829 val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j]; 1830 else { 1831 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 1832 val->vval = vcpu->arch.vr_tm.vr[i-32]; 1833 else 1834 r = -ENXIO; 1835 } 1836 break; 1837 } 1838 case KVM_REG_PPC_TM_CR: 1839 *val = get_reg_val(id, vcpu->arch.cr_tm); 1840 break; 1841 case KVM_REG_PPC_TM_XER: 1842 *val = get_reg_val(id, vcpu->arch.xer_tm); 1843 break; 1844 case KVM_REG_PPC_TM_LR: 1845 *val = get_reg_val(id, vcpu->arch.lr_tm); 1846 break; 1847 case KVM_REG_PPC_TM_CTR: 1848 *val = get_reg_val(id, vcpu->arch.ctr_tm); 1849 break; 1850 case KVM_REG_PPC_TM_FPSCR: 1851 *val = get_reg_val(id, vcpu->arch.fp_tm.fpscr); 1852 break; 1853 case KVM_REG_PPC_TM_AMR: 1854 *val = get_reg_val(id, vcpu->arch.amr_tm); 1855 break; 1856 case KVM_REG_PPC_TM_PPR: 1857 *val = get_reg_val(id, vcpu->arch.ppr_tm); 1858 break; 1859 case KVM_REG_PPC_TM_VRSAVE: 1860 *val = get_reg_val(id, vcpu->arch.vrsave_tm); 1861 break; 1862 case KVM_REG_PPC_TM_VSCR: 1863 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 1864 *val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]); 1865 else 1866 r = -ENXIO; 1867 break; 1868 case KVM_REG_PPC_TM_DSCR: 1869 *val = get_reg_val(id, vcpu->arch.dscr_tm); 1870 break; 1871 case KVM_REG_PPC_TM_TAR: 1872 *val = get_reg_val(id, vcpu->arch.tar_tm); 1873 break; 1874 #endif 1875 case KVM_REG_PPC_ARCH_COMPAT: 1876 *val = get_reg_val(id, vcpu->arch.vcore->arch_compat); 1877 break; 1878 case KVM_REG_PPC_DEC_EXPIRY: 1879 *val = get_reg_val(id, vcpu->arch.dec_expires + 1880 vcpu->arch.vcore->tb_offset); 1881 break; 1882 case KVM_REG_PPC_ONLINE: 1883 *val = get_reg_val(id, vcpu->arch.online); 1884 break; 1885 case KVM_REG_PPC_PTCR: 1886 *val = get_reg_val(id, vcpu->kvm->arch.l1_ptcr); 1887 break; 1888 default: 1889 r = -EINVAL; 1890 break; 1891 } 1892 1893 return r; 1894 } 1895 1896 static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, 1897 union kvmppc_one_reg *val) 1898 { 1899 int r = 0; 1900 long int i; 1901 unsigned long addr, len; 1902 1903 switch (id) { 1904 case KVM_REG_PPC_HIOR: 1905 /* Only allow this to be set to zero */ 1906 if (set_reg_val(id, *val)) 1907 r = -EINVAL; 1908 break; 1909 case KVM_REG_PPC_DABR: 1910 vcpu->arch.dabr = set_reg_val(id, *val); 1911 break; 1912 case KVM_REG_PPC_DABRX: 1913 vcpu->arch.dabrx = set_reg_val(id, *val) & ~DABRX_HYP; 1914 break; 1915 case KVM_REG_PPC_DSCR: 1916 vcpu->arch.dscr = set_reg_val(id, *val); 1917 break; 1918 case KVM_REG_PPC_PURR: 1919 vcpu->arch.purr = set_reg_val(id, *val); 1920 break; 1921 case KVM_REG_PPC_SPURR: 1922 vcpu->arch.spurr = set_reg_val(id, *val); 1923 break; 1924 case KVM_REG_PPC_AMR: 1925 vcpu->arch.amr = set_reg_val(id, *val); 1926 break; 1927 case KVM_REG_PPC_UAMOR: 1928 vcpu->arch.uamor = set_reg_val(id, *val); 1929 break; 1930 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCR1: 1931 i = id - KVM_REG_PPC_MMCR0; 1932 vcpu->arch.mmcr[i] = set_reg_val(id, *val); 1933 break; 1934 case KVM_REG_PPC_MMCR2: 1935 vcpu->arch.mmcr[2] = set_reg_val(id, *val); 1936 break; 1937 case KVM_REG_PPC_MMCRA: 1938 vcpu->arch.mmcra = set_reg_val(id, *val); 1939 break; 1940 case KVM_REG_PPC_MMCRS: 1941 vcpu->arch.mmcrs = set_reg_val(id, *val); 1942 break; 1943 case KVM_REG_PPC_MMCR3: 1944 *val = get_reg_val(id, vcpu->arch.mmcr[3]); 1945 break; 1946 case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8: 1947 i = id - KVM_REG_PPC_PMC1; 1948 vcpu->arch.pmc[i] = set_reg_val(id, *val); 1949 break; 1950 case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2: 1951 i = id - KVM_REG_PPC_SPMC1; 1952 vcpu->arch.spmc[i] = set_reg_val(id, *val); 1953 break; 1954 case KVM_REG_PPC_SIAR: 1955 vcpu->arch.siar = set_reg_val(id, *val); 1956 break; 1957 case KVM_REG_PPC_SDAR: 1958 vcpu->arch.sdar = set_reg_val(id, *val); 1959 break; 1960 case KVM_REG_PPC_SIER: 1961 vcpu->arch.sier[0] = set_reg_val(id, *val); 1962 break; 1963 case KVM_REG_PPC_SIER2: 1964 vcpu->arch.sier[1] = set_reg_val(id, *val); 1965 break; 1966 case KVM_REG_PPC_SIER3: 1967 vcpu->arch.sier[2] = set_reg_val(id, *val); 1968 break; 1969 case KVM_REG_PPC_IAMR: 1970 vcpu->arch.iamr = set_reg_val(id, *val); 1971 break; 1972 case KVM_REG_PPC_PSPB: 1973 vcpu->arch.pspb = set_reg_val(id, *val); 1974 break; 1975 case KVM_REG_PPC_DPDES: 1976 vcpu->arch.vcore->dpdes = set_reg_val(id, *val); 1977 break; 1978 case KVM_REG_PPC_VTB: 1979 vcpu->arch.vcore->vtb = set_reg_val(id, *val); 1980 break; 1981 case KVM_REG_PPC_DAWR: 1982 vcpu->arch.dawr = set_reg_val(id, *val); 1983 break; 1984 case KVM_REG_PPC_DAWRX: 1985 vcpu->arch.dawrx = set_reg_val(id, *val) & ~DAWRX_HYP; 1986 break; 1987 case KVM_REG_PPC_CIABR: 1988 vcpu->arch.ciabr = set_reg_val(id, *val); 1989 /* Don't allow setting breakpoints in hypervisor code */ 1990 if ((vcpu->arch.ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER) 1991 vcpu->arch.ciabr &= ~CIABR_PRIV; /* disable */ 1992 break; 1993 case KVM_REG_PPC_CSIGR: 1994 vcpu->arch.csigr = set_reg_val(id, *val); 1995 break; 1996 case KVM_REG_PPC_TACR: 1997 vcpu->arch.tacr = set_reg_val(id, *val); 1998 break; 1999 case KVM_REG_PPC_TCSCR: 2000 vcpu->arch.tcscr = set_reg_val(id, *val); 2001 break; 2002 case KVM_REG_PPC_PID: 2003 vcpu->arch.pid = set_reg_val(id, *val); 2004 break; 2005 case KVM_REG_PPC_ACOP: 2006 vcpu->arch.acop = set_reg_val(id, *val); 2007 break; 2008 case KVM_REG_PPC_WORT: 2009 vcpu->arch.wort = set_reg_val(id, *val); 2010 break; 2011 case KVM_REG_PPC_TIDR: 2012 vcpu->arch.tid = set_reg_val(id, *val); 2013 break; 2014 case KVM_REG_PPC_PSSCR: 2015 vcpu->arch.psscr = set_reg_val(id, *val) & PSSCR_GUEST_VIS; 2016 break; 2017 case KVM_REG_PPC_VPA_ADDR: 2018 addr = set_reg_val(id, *val); 2019 r = -EINVAL; 2020 if (!addr && (vcpu->arch.slb_shadow.next_gpa || 2021 vcpu->arch.dtl.next_gpa)) 2022 break; 2023 r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca)); 2024 break; 2025 case KVM_REG_PPC_VPA_SLB: 2026 addr = val->vpaval.addr; 2027 len = val->vpaval.length; 2028 r = -EINVAL; 2029 if (addr && !vcpu->arch.vpa.next_gpa) 2030 break; 2031 r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len); 2032 break; 2033 case KVM_REG_PPC_VPA_DTL: 2034 addr = val->vpaval.addr; 2035 len = val->vpaval.length; 2036 r = -EINVAL; 2037 if (addr && (len < sizeof(struct dtl_entry) || 2038 !vcpu->arch.vpa.next_gpa)) 2039 break; 2040 len -= len % sizeof(struct dtl_entry); 2041 r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len); 2042 break; 2043 case KVM_REG_PPC_TB_OFFSET: 2044 /* round up to multiple of 2^24 */ 2045 vcpu->arch.vcore->tb_offset = 2046 ALIGN(set_reg_val(id, *val), 1UL << 24); 2047 break; 2048 case KVM_REG_PPC_LPCR: 2049 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), true); 2050 break; 2051 case KVM_REG_PPC_LPCR_64: 2052 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), false); 2053 break; 2054 case KVM_REG_PPC_PPR: 2055 vcpu->arch.ppr = set_reg_val(id, *val); 2056 break; 2057 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 2058 case KVM_REG_PPC_TFHAR: 2059 vcpu->arch.tfhar = set_reg_val(id, *val); 2060 break; 2061 case KVM_REG_PPC_TFIAR: 2062 vcpu->arch.tfiar = set_reg_val(id, *val); 2063 break; 2064 case KVM_REG_PPC_TEXASR: 2065 vcpu->arch.texasr = set_reg_val(id, *val); 2066 break; 2067 case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31: 2068 i = id - KVM_REG_PPC_TM_GPR0; 2069 vcpu->arch.gpr_tm[i] = set_reg_val(id, *val); 2070 break; 2071 case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63: 2072 { 2073 int j; 2074 i = id - KVM_REG_PPC_TM_VSR0; 2075 if (i < 32) 2076 for (j = 0; j < TS_FPRWIDTH; j++) 2077 vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j]; 2078 else 2079 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 2080 vcpu->arch.vr_tm.vr[i-32] = val->vval; 2081 else 2082 r = -ENXIO; 2083 break; 2084 } 2085 case KVM_REG_PPC_TM_CR: 2086 vcpu->arch.cr_tm = set_reg_val(id, *val); 2087 break; 2088 case KVM_REG_PPC_TM_XER: 2089 vcpu->arch.xer_tm = set_reg_val(id, *val); 2090 break; 2091 case KVM_REG_PPC_TM_LR: 2092 vcpu->arch.lr_tm = set_reg_val(id, *val); 2093 break; 2094 case KVM_REG_PPC_TM_CTR: 2095 vcpu->arch.ctr_tm = set_reg_val(id, *val); 2096 break; 2097 case KVM_REG_PPC_TM_FPSCR: 2098 vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val); 2099 break; 2100 case KVM_REG_PPC_TM_AMR: 2101 vcpu->arch.amr_tm = set_reg_val(id, *val); 2102 break; 2103 case KVM_REG_PPC_TM_PPR: 2104 vcpu->arch.ppr_tm = set_reg_val(id, *val); 2105 break; 2106 case KVM_REG_PPC_TM_VRSAVE: 2107 vcpu->arch.vrsave_tm = set_reg_val(id, *val); 2108 break; 2109 case KVM_REG_PPC_TM_VSCR: 2110 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 2111 vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val); 2112 else 2113 r = - ENXIO; 2114 break; 2115 case KVM_REG_PPC_TM_DSCR: 2116 vcpu->arch.dscr_tm = set_reg_val(id, *val); 2117 break; 2118 case KVM_REG_PPC_TM_TAR: 2119 vcpu->arch.tar_tm = set_reg_val(id, *val); 2120 break; 2121 #endif 2122 case KVM_REG_PPC_ARCH_COMPAT: 2123 r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val)); 2124 break; 2125 case KVM_REG_PPC_DEC_EXPIRY: 2126 vcpu->arch.dec_expires = set_reg_val(id, *val) - 2127 vcpu->arch.vcore->tb_offset; 2128 break; 2129 case KVM_REG_PPC_ONLINE: 2130 i = set_reg_val(id, *val); 2131 if (i && !vcpu->arch.online) 2132 atomic_inc(&vcpu->arch.vcore->online_count); 2133 else if (!i && vcpu->arch.online) 2134 atomic_dec(&vcpu->arch.vcore->online_count); 2135 vcpu->arch.online = i; 2136 break; 2137 case KVM_REG_PPC_PTCR: 2138 vcpu->kvm->arch.l1_ptcr = set_reg_val(id, *val); 2139 break; 2140 default: 2141 r = -EINVAL; 2142 break; 2143 } 2144 2145 return r; 2146 } 2147 2148 /* 2149 * On POWER9, threads are independent and can be in different partitions. 2150 * Therefore we consider each thread to be a subcore. 2151 * There is a restriction that all threads have to be in the same 2152 * MMU mode (radix or HPT), unfortunately, but since we only support 2153 * HPT guests on a HPT host so far, that isn't an impediment yet. 2154 */ 2155 static int threads_per_vcore(struct kvm *kvm) 2156 { 2157 if (kvm->arch.threads_indep) 2158 return 1; 2159 return threads_per_subcore; 2160 } 2161 2162 static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int id) 2163 { 2164 struct kvmppc_vcore *vcore; 2165 2166 vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL); 2167 2168 if (vcore == NULL) 2169 return NULL; 2170 2171 spin_lock_init(&vcore->lock); 2172 spin_lock_init(&vcore->stoltb_lock); 2173 rcuwait_init(&vcore->wait); 2174 vcore->preempt_tb = TB_NIL; 2175 vcore->lpcr = kvm->arch.lpcr; 2176 vcore->first_vcpuid = id; 2177 vcore->kvm = kvm; 2178 INIT_LIST_HEAD(&vcore->preempt_list); 2179 2180 return vcore; 2181 } 2182 2183 #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING 2184 static struct debugfs_timings_element { 2185 const char *name; 2186 size_t offset; 2187 } timings[] = { 2188 {"rm_entry", offsetof(struct kvm_vcpu, arch.rm_entry)}, 2189 {"rm_intr", offsetof(struct kvm_vcpu, arch.rm_intr)}, 2190 {"rm_exit", offsetof(struct kvm_vcpu, arch.rm_exit)}, 2191 {"guest", offsetof(struct kvm_vcpu, arch.guest_time)}, 2192 {"cede", offsetof(struct kvm_vcpu, arch.cede_time)}, 2193 }; 2194 2195 #define N_TIMINGS (ARRAY_SIZE(timings)) 2196 2197 struct debugfs_timings_state { 2198 struct kvm_vcpu *vcpu; 2199 unsigned int buflen; 2200 char buf[N_TIMINGS * 100]; 2201 }; 2202 2203 static int debugfs_timings_open(struct inode *inode, struct file *file) 2204 { 2205 struct kvm_vcpu *vcpu = inode->i_private; 2206 struct debugfs_timings_state *p; 2207 2208 p = kzalloc(sizeof(*p), GFP_KERNEL); 2209 if (!p) 2210 return -ENOMEM; 2211 2212 kvm_get_kvm(vcpu->kvm); 2213 p->vcpu = vcpu; 2214 file->private_data = p; 2215 2216 return nonseekable_open(inode, file); 2217 } 2218 2219 static int debugfs_timings_release(struct inode *inode, struct file *file) 2220 { 2221 struct debugfs_timings_state *p = file->private_data; 2222 2223 kvm_put_kvm(p->vcpu->kvm); 2224 kfree(p); 2225 return 0; 2226 } 2227 2228 static ssize_t debugfs_timings_read(struct file *file, char __user *buf, 2229 size_t len, loff_t *ppos) 2230 { 2231 struct debugfs_timings_state *p = file->private_data; 2232 struct kvm_vcpu *vcpu = p->vcpu; 2233 char *s, *buf_end; 2234 struct kvmhv_tb_accumulator tb; 2235 u64 count; 2236 loff_t pos; 2237 ssize_t n; 2238 int i, loops; 2239 bool ok; 2240 2241 if (!p->buflen) { 2242 s = p->buf; 2243 buf_end = s + sizeof(p->buf); 2244 for (i = 0; i < N_TIMINGS; ++i) { 2245 struct kvmhv_tb_accumulator *acc; 2246 2247 acc = (struct kvmhv_tb_accumulator *) 2248 ((unsigned long)vcpu + timings[i].offset); 2249 ok = false; 2250 for (loops = 0; loops < 1000; ++loops) { 2251 count = acc->seqcount; 2252 if (!(count & 1)) { 2253 smp_rmb(); 2254 tb = *acc; 2255 smp_rmb(); 2256 if (count == acc->seqcount) { 2257 ok = true; 2258 break; 2259 } 2260 } 2261 udelay(1); 2262 } 2263 if (!ok) 2264 snprintf(s, buf_end - s, "%s: stuck\n", 2265 timings[i].name); 2266 else 2267 snprintf(s, buf_end - s, 2268 "%s: %llu %llu %llu %llu\n", 2269 timings[i].name, count / 2, 2270 tb_to_ns(tb.tb_total), 2271 tb_to_ns(tb.tb_min), 2272 tb_to_ns(tb.tb_max)); 2273 s += strlen(s); 2274 } 2275 p->buflen = s - p->buf; 2276 } 2277 2278 pos = *ppos; 2279 if (pos >= p->buflen) 2280 return 0; 2281 if (len > p->buflen - pos) 2282 len = p->buflen - pos; 2283 n = copy_to_user(buf, p->buf + pos, len); 2284 if (n) { 2285 if (n == len) 2286 return -EFAULT; 2287 len -= n; 2288 } 2289 *ppos = pos + len; 2290 return len; 2291 } 2292 2293 static ssize_t debugfs_timings_write(struct file *file, const char __user *buf, 2294 size_t len, loff_t *ppos) 2295 { 2296 return -EACCES; 2297 } 2298 2299 static const struct file_operations debugfs_timings_ops = { 2300 .owner = THIS_MODULE, 2301 .open = debugfs_timings_open, 2302 .release = debugfs_timings_release, 2303 .read = debugfs_timings_read, 2304 .write = debugfs_timings_write, 2305 .llseek = generic_file_llseek, 2306 }; 2307 2308 /* Create a debugfs directory for the vcpu */ 2309 static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id) 2310 { 2311 char buf[16]; 2312 struct kvm *kvm = vcpu->kvm; 2313 2314 snprintf(buf, sizeof(buf), "vcpu%u", id); 2315 vcpu->arch.debugfs_dir = debugfs_create_dir(buf, kvm->arch.debugfs_dir); 2316 debugfs_create_file("timings", 0444, vcpu->arch.debugfs_dir, vcpu, 2317 &debugfs_timings_ops); 2318 } 2319 2320 #else /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ 2321 static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id) 2322 { 2323 } 2324 #endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ 2325 2326 static int kvmppc_core_vcpu_create_hv(struct kvm_vcpu *vcpu) 2327 { 2328 int err; 2329 int core; 2330 struct kvmppc_vcore *vcore; 2331 struct kvm *kvm; 2332 unsigned int id; 2333 2334 kvm = vcpu->kvm; 2335 id = vcpu->vcpu_id; 2336 2337 vcpu->arch.shared = &vcpu->arch.shregs; 2338 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE 2339 /* 2340 * The shared struct is never shared on HV, 2341 * so we can always use host endianness 2342 */ 2343 #ifdef __BIG_ENDIAN__ 2344 vcpu->arch.shared_big_endian = true; 2345 #else 2346 vcpu->arch.shared_big_endian = false; 2347 #endif 2348 #endif 2349 vcpu->arch.mmcr[0] = MMCR0_FC; 2350 vcpu->arch.ctrl = CTRL_RUNLATCH; 2351 /* default to host PVR, since we can't spoof it */ 2352 kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR)); 2353 spin_lock_init(&vcpu->arch.vpa_update_lock); 2354 spin_lock_init(&vcpu->arch.tbacct_lock); 2355 vcpu->arch.busy_preempt = TB_NIL; 2356 vcpu->arch.intr_msr = MSR_SF | MSR_ME; 2357 2358 /* 2359 * Set the default HFSCR for the guest from the host value. 2360 * This value is only used on POWER9. 2361 * On POWER9, we want to virtualize the doorbell facility, so we 2362 * don't set the HFSCR_MSGP bit, and that causes those instructions 2363 * to trap and then we emulate them. 2364 */ 2365 vcpu->arch.hfscr = HFSCR_TAR | HFSCR_EBB | HFSCR_PM | HFSCR_BHRB | 2366 HFSCR_DSCR | HFSCR_VECVSX | HFSCR_FP | HFSCR_PREFIX; 2367 if (cpu_has_feature(CPU_FTR_HVMODE)) { 2368 vcpu->arch.hfscr &= mfspr(SPRN_HFSCR); 2369 if (cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) 2370 vcpu->arch.hfscr |= HFSCR_TM; 2371 } 2372 if (cpu_has_feature(CPU_FTR_TM_COMP)) 2373 vcpu->arch.hfscr |= HFSCR_TM; 2374 2375 kvmppc_mmu_book3s_hv_init(vcpu); 2376 2377 vcpu->arch.state = KVMPPC_VCPU_NOTREADY; 2378 2379 init_waitqueue_head(&vcpu->arch.cpu_run); 2380 2381 mutex_lock(&kvm->lock); 2382 vcore = NULL; 2383 err = -EINVAL; 2384 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 2385 if (id >= (KVM_MAX_VCPUS * kvm->arch.emul_smt_mode)) { 2386 pr_devel("KVM: VCPU ID too high\n"); 2387 core = KVM_MAX_VCORES; 2388 } else { 2389 BUG_ON(kvm->arch.smt_mode != 1); 2390 core = kvmppc_pack_vcpu_id(kvm, id); 2391 } 2392 } else { 2393 core = id / kvm->arch.smt_mode; 2394 } 2395 if (core < KVM_MAX_VCORES) { 2396 vcore = kvm->arch.vcores[core]; 2397 if (vcore && cpu_has_feature(CPU_FTR_ARCH_300)) { 2398 pr_devel("KVM: collision on id %u", id); 2399 vcore = NULL; 2400 } else if (!vcore) { 2401 /* 2402 * Take mmu_setup_lock for mutual exclusion 2403 * with kvmppc_update_lpcr(). 2404 */ 2405 err = -ENOMEM; 2406 vcore = kvmppc_vcore_create(kvm, 2407 id & ~(kvm->arch.smt_mode - 1)); 2408 mutex_lock(&kvm->arch.mmu_setup_lock); 2409 kvm->arch.vcores[core] = vcore; 2410 kvm->arch.online_vcores++; 2411 mutex_unlock(&kvm->arch.mmu_setup_lock); 2412 } 2413 } 2414 mutex_unlock(&kvm->lock); 2415 2416 if (!vcore) 2417 return err; 2418 2419 spin_lock(&vcore->lock); 2420 ++vcore->num_threads; 2421 spin_unlock(&vcore->lock); 2422 vcpu->arch.vcore = vcore; 2423 vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid; 2424 vcpu->arch.thread_cpu = -1; 2425 vcpu->arch.prev_cpu = -1; 2426 2427 vcpu->arch.cpu_type = KVM_CPU_3S_64; 2428 kvmppc_sanity_check(vcpu); 2429 2430 debugfs_vcpu_init(vcpu, id); 2431 2432 return 0; 2433 } 2434 2435 static int kvmhv_set_smt_mode(struct kvm *kvm, unsigned long smt_mode, 2436 unsigned long flags) 2437 { 2438 int err; 2439 int esmt = 0; 2440 2441 if (flags) 2442 return -EINVAL; 2443 if (smt_mode > MAX_SMT_THREADS || !is_power_of_2(smt_mode)) 2444 return -EINVAL; 2445 if (!cpu_has_feature(CPU_FTR_ARCH_300)) { 2446 /* 2447 * On POWER8 (or POWER7), the threading mode is "strict", 2448 * so we pack smt_mode vcpus per vcore. 2449 */ 2450 if (smt_mode > threads_per_subcore) 2451 return -EINVAL; 2452 } else { 2453 /* 2454 * On POWER9, the threading mode is "loose", 2455 * so each vcpu gets its own vcore. 2456 */ 2457 esmt = smt_mode; 2458 smt_mode = 1; 2459 } 2460 mutex_lock(&kvm->lock); 2461 err = -EBUSY; 2462 if (!kvm->arch.online_vcores) { 2463 kvm->arch.smt_mode = smt_mode; 2464 kvm->arch.emul_smt_mode = esmt; 2465 err = 0; 2466 } 2467 mutex_unlock(&kvm->lock); 2468 2469 return err; 2470 } 2471 2472 static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa) 2473 { 2474 if (vpa->pinned_addr) 2475 kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa, 2476 vpa->dirty); 2477 } 2478 2479 static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu) 2480 { 2481 spin_lock(&vcpu->arch.vpa_update_lock); 2482 unpin_vpa(vcpu->kvm, &vcpu->arch.dtl); 2483 unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow); 2484 unpin_vpa(vcpu->kvm, &vcpu->arch.vpa); 2485 spin_unlock(&vcpu->arch.vpa_update_lock); 2486 } 2487 2488 static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu) 2489 { 2490 /* Indicate we want to get back into the guest */ 2491 return 1; 2492 } 2493 2494 static void kvmppc_set_timer(struct kvm_vcpu *vcpu) 2495 { 2496 unsigned long dec_nsec, now; 2497 2498 now = get_tb(); 2499 if (now > vcpu->arch.dec_expires) { 2500 /* decrementer has already gone negative */ 2501 kvmppc_core_queue_dec(vcpu); 2502 kvmppc_core_prepare_to_enter(vcpu); 2503 return; 2504 } 2505 dec_nsec = tb_to_ns(vcpu->arch.dec_expires - now); 2506 hrtimer_start(&vcpu->arch.dec_timer, dec_nsec, HRTIMER_MODE_REL); 2507 vcpu->arch.timer_running = 1; 2508 } 2509 2510 extern int __kvmppc_vcore_entry(void); 2511 2512 static void kvmppc_remove_runnable(struct kvmppc_vcore *vc, 2513 struct kvm_vcpu *vcpu) 2514 { 2515 u64 now; 2516 2517 if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE) 2518 return; 2519 spin_lock_irq(&vcpu->arch.tbacct_lock); 2520 now = mftb(); 2521 vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) - 2522 vcpu->arch.stolen_logged; 2523 vcpu->arch.busy_preempt = now; 2524 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; 2525 spin_unlock_irq(&vcpu->arch.tbacct_lock); 2526 --vc->n_runnable; 2527 WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], NULL); 2528 } 2529 2530 static int kvmppc_grab_hwthread(int cpu) 2531 { 2532 struct paca_struct *tpaca; 2533 long timeout = 10000; 2534 2535 tpaca = paca_ptrs[cpu]; 2536 2537 /* Ensure the thread won't go into the kernel if it wakes */ 2538 tpaca->kvm_hstate.kvm_vcpu = NULL; 2539 tpaca->kvm_hstate.kvm_vcore = NULL; 2540 tpaca->kvm_hstate.napping = 0; 2541 smp_wmb(); 2542 tpaca->kvm_hstate.hwthread_req = 1; 2543 2544 /* 2545 * If the thread is already executing in the kernel (e.g. handling 2546 * a stray interrupt), wait for it to get back to nap mode. 2547 * The smp_mb() is to ensure that our setting of hwthread_req 2548 * is visible before we look at hwthread_state, so if this 2549 * races with the code at system_reset_pSeries and the thread 2550 * misses our setting of hwthread_req, we are sure to see its 2551 * setting of hwthread_state, and vice versa. 2552 */ 2553 smp_mb(); 2554 while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) { 2555 if (--timeout <= 0) { 2556 pr_err("KVM: couldn't grab cpu %d\n", cpu); 2557 return -EBUSY; 2558 } 2559 udelay(1); 2560 } 2561 return 0; 2562 } 2563 2564 static void kvmppc_release_hwthread(int cpu) 2565 { 2566 struct paca_struct *tpaca; 2567 2568 tpaca = paca_ptrs[cpu]; 2569 tpaca->kvm_hstate.hwthread_req = 0; 2570 tpaca->kvm_hstate.kvm_vcpu = NULL; 2571 tpaca->kvm_hstate.kvm_vcore = NULL; 2572 tpaca->kvm_hstate.kvm_split_mode = NULL; 2573 } 2574 2575 static void radix_flush_cpu(struct kvm *kvm, int cpu, struct kvm_vcpu *vcpu) 2576 { 2577 struct kvm_nested_guest *nested = vcpu->arch.nested; 2578 cpumask_t *cpu_in_guest; 2579 int i; 2580 2581 cpu = cpu_first_thread_sibling(cpu); 2582 if (nested) { 2583 cpumask_set_cpu(cpu, &nested->need_tlb_flush); 2584 cpu_in_guest = &nested->cpu_in_guest; 2585 } else { 2586 cpumask_set_cpu(cpu, &kvm->arch.need_tlb_flush); 2587 cpu_in_guest = &kvm->arch.cpu_in_guest; 2588 } 2589 /* 2590 * Make sure setting of bit in need_tlb_flush precedes 2591 * testing of cpu_in_guest bits. The matching barrier on 2592 * the other side is the first smp_mb() in kvmppc_run_core(). 2593 */ 2594 smp_mb(); 2595 for (i = 0; i < threads_per_core; ++i) 2596 if (cpumask_test_cpu(cpu + i, cpu_in_guest)) 2597 smp_call_function_single(cpu + i, do_nothing, NULL, 1); 2598 } 2599 2600 static void kvmppc_prepare_radix_vcpu(struct kvm_vcpu *vcpu, int pcpu) 2601 { 2602 struct kvm_nested_guest *nested = vcpu->arch.nested; 2603 struct kvm *kvm = vcpu->kvm; 2604 int prev_cpu; 2605 2606 if (!cpu_has_feature(CPU_FTR_HVMODE)) 2607 return; 2608 2609 if (nested) 2610 prev_cpu = nested->prev_cpu[vcpu->arch.nested_vcpu_id]; 2611 else 2612 prev_cpu = vcpu->arch.prev_cpu; 2613 2614 /* 2615 * With radix, the guest can do TLB invalidations itself, 2616 * and it could choose to use the local form (tlbiel) if 2617 * it is invalidating a translation that has only ever been 2618 * used on one vcpu. However, that doesn't mean it has 2619 * only ever been used on one physical cpu, since vcpus 2620 * can move around between pcpus. To cope with this, when 2621 * a vcpu moves from one pcpu to another, we need to tell 2622 * any vcpus running on the same core as this vcpu previously 2623 * ran to flush the TLB. The TLB is shared between threads, 2624 * so we use a single bit in .need_tlb_flush for all 4 threads. 2625 */ 2626 if (prev_cpu != pcpu) { 2627 if (prev_cpu >= 0 && 2628 cpu_first_thread_sibling(prev_cpu) != 2629 cpu_first_thread_sibling(pcpu)) 2630 radix_flush_cpu(kvm, prev_cpu, vcpu); 2631 if (nested) 2632 nested->prev_cpu[vcpu->arch.nested_vcpu_id] = pcpu; 2633 else 2634 vcpu->arch.prev_cpu = pcpu; 2635 } 2636 } 2637 2638 static void kvmppc_start_thread(struct kvm_vcpu *vcpu, struct kvmppc_vcore *vc) 2639 { 2640 int cpu; 2641 struct paca_struct *tpaca; 2642 struct kvm *kvm = vc->kvm; 2643 2644 cpu = vc->pcpu; 2645 if (vcpu) { 2646 if (vcpu->arch.timer_running) { 2647 hrtimer_try_to_cancel(&vcpu->arch.dec_timer); 2648 vcpu->arch.timer_running = 0; 2649 } 2650 cpu += vcpu->arch.ptid; 2651 vcpu->cpu = vc->pcpu; 2652 vcpu->arch.thread_cpu = cpu; 2653 cpumask_set_cpu(cpu, &kvm->arch.cpu_in_guest); 2654 } 2655 tpaca = paca_ptrs[cpu]; 2656 tpaca->kvm_hstate.kvm_vcpu = vcpu; 2657 tpaca->kvm_hstate.ptid = cpu - vc->pcpu; 2658 tpaca->kvm_hstate.fake_suspend = 0; 2659 /* Order stores to hstate.kvm_vcpu etc. before store to kvm_vcore */ 2660 smp_wmb(); 2661 tpaca->kvm_hstate.kvm_vcore = vc; 2662 if (cpu != smp_processor_id()) 2663 kvmppc_ipi_thread(cpu); 2664 } 2665 2666 static void kvmppc_wait_for_nap(int n_threads) 2667 { 2668 int cpu = smp_processor_id(); 2669 int i, loops; 2670 2671 if (n_threads <= 1) 2672 return; 2673 for (loops = 0; loops < 1000000; ++loops) { 2674 /* 2675 * Check if all threads are finished. 2676 * We set the vcore pointer when starting a thread 2677 * and the thread clears it when finished, so we look 2678 * for any threads that still have a non-NULL vcore ptr. 2679 */ 2680 for (i = 1; i < n_threads; ++i) 2681 if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore) 2682 break; 2683 if (i == n_threads) { 2684 HMT_medium(); 2685 return; 2686 } 2687 HMT_low(); 2688 } 2689 HMT_medium(); 2690 for (i = 1; i < n_threads; ++i) 2691 if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore) 2692 pr_err("KVM: CPU %d seems to be stuck\n", cpu + i); 2693 } 2694 2695 /* 2696 * Check that we are on thread 0 and that any other threads in 2697 * this core are off-line. Then grab the threads so they can't 2698 * enter the kernel. 2699 */ 2700 static int on_primary_thread(void) 2701 { 2702 int cpu = smp_processor_id(); 2703 int thr; 2704 2705 /* Are we on a primary subcore? */ 2706 if (cpu_thread_in_subcore(cpu)) 2707 return 0; 2708 2709 thr = 0; 2710 while (++thr < threads_per_subcore) 2711 if (cpu_online(cpu + thr)) 2712 return 0; 2713 2714 /* Grab all hw threads so they can't go into the kernel */ 2715 for (thr = 1; thr < threads_per_subcore; ++thr) { 2716 if (kvmppc_grab_hwthread(cpu + thr)) { 2717 /* Couldn't grab one; let the others go */ 2718 do { 2719 kvmppc_release_hwthread(cpu + thr); 2720 } while (--thr > 0); 2721 return 0; 2722 } 2723 } 2724 return 1; 2725 } 2726 2727 /* 2728 * A list of virtual cores for each physical CPU. 2729 * These are vcores that could run but their runner VCPU tasks are 2730 * (or may be) preempted. 2731 */ 2732 struct preempted_vcore_list { 2733 struct list_head list; 2734 spinlock_t lock; 2735 }; 2736 2737 static DEFINE_PER_CPU(struct preempted_vcore_list, preempted_vcores); 2738 2739 static void init_vcore_lists(void) 2740 { 2741 int cpu; 2742 2743 for_each_possible_cpu(cpu) { 2744 struct preempted_vcore_list *lp = &per_cpu(preempted_vcores, cpu); 2745 spin_lock_init(&lp->lock); 2746 INIT_LIST_HEAD(&lp->list); 2747 } 2748 } 2749 2750 static void kvmppc_vcore_preempt(struct kvmppc_vcore *vc) 2751 { 2752 struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores); 2753 2754 vc->vcore_state = VCORE_PREEMPT; 2755 vc->pcpu = smp_processor_id(); 2756 if (vc->num_threads < threads_per_vcore(vc->kvm)) { 2757 spin_lock(&lp->lock); 2758 list_add_tail(&vc->preempt_list, &lp->list); 2759 spin_unlock(&lp->lock); 2760 } 2761 2762 /* Start accumulating stolen time */ 2763 kvmppc_core_start_stolen(vc); 2764 } 2765 2766 static void kvmppc_vcore_end_preempt(struct kvmppc_vcore *vc) 2767 { 2768 struct preempted_vcore_list *lp; 2769 2770 kvmppc_core_end_stolen(vc); 2771 if (!list_empty(&vc->preempt_list)) { 2772 lp = &per_cpu(preempted_vcores, vc->pcpu); 2773 spin_lock(&lp->lock); 2774 list_del_init(&vc->preempt_list); 2775 spin_unlock(&lp->lock); 2776 } 2777 vc->vcore_state = VCORE_INACTIVE; 2778 } 2779 2780 /* 2781 * This stores information about the virtual cores currently 2782 * assigned to a physical core. 2783 */ 2784 struct core_info { 2785 int n_subcores; 2786 int max_subcore_threads; 2787 int total_threads; 2788 int subcore_threads[MAX_SUBCORES]; 2789 struct kvmppc_vcore *vc[MAX_SUBCORES]; 2790 }; 2791 2792 /* 2793 * This mapping means subcores 0 and 1 can use threads 0-3 and 4-7 2794 * respectively in 2-way micro-threading (split-core) mode on POWER8. 2795 */ 2796 static int subcore_thread_map[MAX_SUBCORES] = { 0, 4, 2, 6 }; 2797 2798 static void init_core_info(struct core_info *cip, struct kvmppc_vcore *vc) 2799 { 2800 memset(cip, 0, sizeof(*cip)); 2801 cip->n_subcores = 1; 2802 cip->max_subcore_threads = vc->num_threads; 2803 cip->total_threads = vc->num_threads; 2804 cip->subcore_threads[0] = vc->num_threads; 2805 cip->vc[0] = vc; 2806 } 2807 2808 static bool subcore_config_ok(int n_subcores, int n_threads) 2809 { 2810 /* 2811 * POWER9 "SMT4" cores are permanently in what is effectively a 4-way 2812 * split-core mode, with one thread per subcore. 2813 */ 2814 if (cpu_has_feature(CPU_FTR_ARCH_300)) 2815 return n_subcores <= 4 && n_threads == 1; 2816 2817 /* On POWER8, can only dynamically split if unsplit to begin with */ 2818 if (n_subcores > 1 && threads_per_subcore < MAX_SMT_THREADS) 2819 return false; 2820 if (n_subcores > MAX_SUBCORES) 2821 return false; 2822 if (n_subcores > 1) { 2823 if (!(dynamic_mt_modes & 2)) 2824 n_subcores = 4; 2825 if (n_subcores > 2 && !(dynamic_mt_modes & 4)) 2826 return false; 2827 } 2828 2829 return n_subcores * roundup_pow_of_two(n_threads) <= MAX_SMT_THREADS; 2830 } 2831 2832 static void init_vcore_to_run(struct kvmppc_vcore *vc) 2833 { 2834 vc->entry_exit_map = 0; 2835 vc->in_guest = 0; 2836 vc->napping_threads = 0; 2837 vc->conferring_threads = 0; 2838 vc->tb_offset_applied = 0; 2839 } 2840 2841 static bool can_dynamic_split(struct kvmppc_vcore *vc, struct core_info *cip) 2842 { 2843 int n_threads = vc->num_threads; 2844 int sub; 2845 2846 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) 2847 return false; 2848 2849 /* In one_vm_per_core mode, require all vcores to be from the same vm */ 2850 if (one_vm_per_core && vc->kvm != cip->vc[0]->kvm) 2851 return false; 2852 2853 /* Some POWER9 chips require all threads to be in the same MMU mode */ 2854 if (no_mixing_hpt_and_radix && 2855 kvm_is_radix(vc->kvm) != kvm_is_radix(cip->vc[0]->kvm)) 2856 return false; 2857 2858 if (n_threads < cip->max_subcore_threads) 2859 n_threads = cip->max_subcore_threads; 2860 if (!subcore_config_ok(cip->n_subcores + 1, n_threads)) 2861 return false; 2862 cip->max_subcore_threads = n_threads; 2863 2864 sub = cip->n_subcores; 2865 ++cip->n_subcores; 2866 cip->total_threads += vc->num_threads; 2867 cip->subcore_threads[sub] = vc->num_threads; 2868 cip->vc[sub] = vc; 2869 init_vcore_to_run(vc); 2870 list_del_init(&vc->preempt_list); 2871 2872 return true; 2873 } 2874 2875 /* 2876 * Work out whether it is possible to piggyback the execution of 2877 * vcore *pvc onto the execution of the other vcores described in *cip. 2878 */ 2879 static bool can_piggyback(struct kvmppc_vcore *pvc, struct core_info *cip, 2880 int target_threads) 2881 { 2882 if (cip->total_threads + pvc->num_threads > target_threads) 2883 return false; 2884 2885 return can_dynamic_split(pvc, cip); 2886 } 2887 2888 static void prepare_threads(struct kvmppc_vcore *vc) 2889 { 2890 int i; 2891 struct kvm_vcpu *vcpu; 2892 2893 for_each_runnable_thread(i, vcpu, vc) { 2894 if (signal_pending(vcpu->arch.run_task)) 2895 vcpu->arch.ret = -EINTR; 2896 else if (vcpu->arch.vpa.update_pending || 2897 vcpu->arch.slb_shadow.update_pending || 2898 vcpu->arch.dtl.update_pending) 2899 vcpu->arch.ret = RESUME_GUEST; 2900 else 2901 continue; 2902 kvmppc_remove_runnable(vc, vcpu); 2903 wake_up(&vcpu->arch.cpu_run); 2904 } 2905 } 2906 2907 static void collect_piggybacks(struct core_info *cip, int target_threads) 2908 { 2909 struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores); 2910 struct kvmppc_vcore *pvc, *vcnext; 2911 2912 spin_lock(&lp->lock); 2913 list_for_each_entry_safe(pvc, vcnext, &lp->list, preempt_list) { 2914 if (!spin_trylock(&pvc->lock)) 2915 continue; 2916 prepare_threads(pvc); 2917 if (!pvc->n_runnable || !pvc->kvm->arch.mmu_ready) { 2918 list_del_init(&pvc->preempt_list); 2919 if (pvc->runner == NULL) { 2920 pvc->vcore_state = VCORE_INACTIVE; 2921 kvmppc_core_end_stolen(pvc); 2922 } 2923 spin_unlock(&pvc->lock); 2924 continue; 2925 } 2926 if (!can_piggyback(pvc, cip, target_threads)) { 2927 spin_unlock(&pvc->lock); 2928 continue; 2929 } 2930 kvmppc_core_end_stolen(pvc); 2931 pvc->vcore_state = VCORE_PIGGYBACK; 2932 if (cip->total_threads >= target_threads) 2933 break; 2934 } 2935 spin_unlock(&lp->lock); 2936 } 2937 2938 static bool recheck_signals_and_mmu(struct core_info *cip) 2939 { 2940 int sub, i; 2941 struct kvm_vcpu *vcpu; 2942 struct kvmppc_vcore *vc; 2943 2944 for (sub = 0; sub < cip->n_subcores; ++sub) { 2945 vc = cip->vc[sub]; 2946 if (!vc->kvm->arch.mmu_ready) 2947 return true; 2948 for_each_runnable_thread(i, vcpu, vc) 2949 if (signal_pending(vcpu->arch.run_task)) 2950 return true; 2951 } 2952 return false; 2953 } 2954 2955 static void post_guest_process(struct kvmppc_vcore *vc, bool is_master) 2956 { 2957 int still_running = 0, i; 2958 u64 now; 2959 long ret; 2960 struct kvm_vcpu *vcpu; 2961 2962 spin_lock(&vc->lock); 2963 now = get_tb(); 2964 for_each_runnable_thread(i, vcpu, vc) { 2965 /* 2966 * It's safe to unlock the vcore in the loop here, because 2967 * for_each_runnable_thread() is safe against removal of 2968 * the vcpu, and the vcore state is VCORE_EXITING here, 2969 * so any vcpus becoming runnable will have their arch.trap 2970 * set to zero and can't actually run in the guest. 2971 */ 2972 spin_unlock(&vc->lock); 2973 /* cancel pending dec exception if dec is positive */ 2974 if (now < vcpu->arch.dec_expires && 2975 kvmppc_core_pending_dec(vcpu)) 2976 kvmppc_core_dequeue_dec(vcpu); 2977 2978 trace_kvm_guest_exit(vcpu); 2979 2980 ret = RESUME_GUEST; 2981 if (vcpu->arch.trap) 2982 ret = kvmppc_handle_exit_hv(vcpu, 2983 vcpu->arch.run_task); 2984 2985 vcpu->arch.ret = ret; 2986 vcpu->arch.trap = 0; 2987 2988 spin_lock(&vc->lock); 2989 if (is_kvmppc_resume_guest(vcpu->arch.ret)) { 2990 if (vcpu->arch.pending_exceptions) 2991 kvmppc_core_prepare_to_enter(vcpu); 2992 if (vcpu->arch.ceded) 2993 kvmppc_set_timer(vcpu); 2994 else 2995 ++still_running; 2996 } else { 2997 kvmppc_remove_runnable(vc, vcpu); 2998 wake_up(&vcpu->arch.cpu_run); 2999 } 3000 } 3001 if (!is_master) { 3002 if (still_running > 0) { 3003 kvmppc_vcore_preempt(vc); 3004 } else if (vc->runner) { 3005 vc->vcore_state = VCORE_PREEMPT; 3006 kvmppc_core_start_stolen(vc); 3007 } else { 3008 vc->vcore_state = VCORE_INACTIVE; 3009 } 3010 if (vc->n_runnable > 0 && vc->runner == NULL) { 3011 /* make sure there's a candidate runner awake */ 3012 i = -1; 3013 vcpu = next_runnable_thread(vc, &i); 3014 wake_up(&vcpu->arch.cpu_run); 3015 } 3016 } 3017 spin_unlock(&vc->lock); 3018 } 3019 3020 /* 3021 * Clear core from the list of active host cores as we are about to 3022 * enter the guest. Only do this if it is the primary thread of the 3023 * core (not if a subcore) that is entering the guest. 3024 */ 3025 static inline int kvmppc_clear_host_core(unsigned int cpu) 3026 { 3027 int core; 3028 3029 if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu)) 3030 return 0; 3031 /* 3032 * Memory barrier can be omitted here as we will do a smp_wmb() 3033 * later in kvmppc_start_thread and we need ensure that state is 3034 * visible to other CPUs only after we enter guest. 3035 */ 3036 core = cpu >> threads_shift; 3037 kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 0; 3038 return 0; 3039 } 3040 3041 /* 3042 * Advertise this core as an active host core since we exited the guest 3043 * Only need to do this if it is the primary thread of the core that is 3044 * exiting. 3045 */ 3046 static inline int kvmppc_set_host_core(unsigned int cpu) 3047 { 3048 int core; 3049 3050 if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu)) 3051 return 0; 3052 3053 /* 3054 * Memory barrier can be omitted here because we do a spin_unlock 3055 * immediately after this which provides the memory barrier. 3056 */ 3057 core = cpu >> threads_shift; 3058 kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 1; 3059 return 0; 3060 } 3061 3062 static void set_irq_happened(int trap) 3063 { 3064 switch (trap) { 3065 case BOOK3S_INTERRUPT_EXTERNAL: 3066 local_paca->irq_happened |= PACA_IRQ_EE; 3067 break; 3068 case BOOK3S_INTERRUPT_H_DOORBELL: 3069 local_paca->irq_happened |= PACA_IRQ_DBELL; 3070 break; 3071 case BOOK3S_INTERRUPT_HMI: 3072 local_paca->irq_happened |= PACA_IRQ_HMI; 3073 break; 3074 case BOOK3S_INTERRUPT_SYSTEM_RESET: 3075 replay_system_reset(); 3076 break; 3077 } 3078 } 3079 3080 /* 3081 * Run a set of guest threads on a physical core. 3082 * Called with vc->lock held. 3083 */ 3084 static noinline void kvmppc_run_core(struct kvmppc_vcore *vc) 3085 { 3086 struct kvm_vcpu *vcpu; 3087 int i; 3088 int srcu_idx; 3089 struct core_info core_info; 3090 struct kvmppc_vcore *pvc; 3091 struct kvm_split_mode split_info, *sip; 3092 int split, subcore_size, active; 3093 int sub; 3094 bool thr0_done; 3095 unsigned long cmd_bit, stat_bit; 3096 int pcpu, thr; 3097 int target_threads; 3098 int controlled_threads; 3099 int trap; 3100 bool is_power8; 3101 bool hpt_on_radix; 3102 3103 /* 3104 * Remove from the list any threads that have a signal pending 3105 * or need a VPA update done 3106 */ 3107 prepare_threads(vc); 3108 3109 /* if the runner is no longer runnable, let the caller pick a new one */ 3110 if (vc->runner->arch.state != KVMPPC_VCPU_RUNNABLE) 3111 return; 3112 3113 /* 3114 * Initialize *vc. 3115 */ 3116 init_vcore_to_run(vc); 3117 vc->preempt_tb = TB_NIL; 3118 3119 /* 3120 * Number of threads that we will be controlling: the same as 3121 * the number of threads per subcore, except on POWER9, 3122 * where it's 1 because the threads are (mostly) independent. 3123 */ 3124 controlled_threads = threads_per_vcore(vc->kvm); 3125 3126 /* 3127 * Make sure we are running on primary threads, and that secondary 3128 * threads are offline. Also check if the number of threads in this 3129 * guest are greater than the current system threads per guest. 3130 * On POWER9, we need to be not in independent-threads mode if 3131 * this is a HPT guest on a radix host machine where the 3132 * CPU threads may not be in different MMU modes. 3133 */ 3134 hpt_on_radix = no_mixing_hpt_and_radix && radix_enabled() && 3135 !kvm_is_radix(vc->kvm); 3136 if (((controlled_threads > 1) && 3137 ((vc->num_threads > threads_per_subcore) || !on_primary_thread())) || 3138 (hpt_on_radix && vc->kvm->arch.threads_indep)) { 3139 for_each_runnable_thread(i, vcpu, vc) { 3140 vcpu->arch.ret = -EBUSY; 3141 kvmppc_remove_runnable(vc, vcpu); 3142 wake_up(&vcpu->arch.cpu_run); 3143 } 3144 goto out; 3145 } 3146 3147 /* 3148 * See if we could run any other vcores on the physical core 3149 * along with this one. 3150 */ 3151 init_core_info(&core_info, vc); 3152 pcpu = smp_processor_id(); 3153 target_threads = controlled_threads; 3154 if (target_smt_mode && target_smt_mode < target_threads) 3155 target_threads = target_smt_mode; 3156 if (vc->num_threads < target_threads) 3157 collect_piggybacks(&core_info, target_threads); 3158 3159 /* 3160 * On radix, arrange for TLB flushing if necessary. 3161 * This has to be done before disabling interrupts since 3162 * it uses smp_call_function(). 3163 */ 3164 pcpu = smp_processor_id(); 3165 if (kvm_is_radix(vc->kvm)) { 3166 for (sub = 0; sub < core_info.n_subcores; ++sub) 3167 for_each_runnable_thread(i, vcpu, core_info.vc[sub]) 3168 kvmppc_prepare_radix_vcpu(vcpu, pcpu); 3169 } 3170 3171 /* 3172 * Hard-disable interrupts, and check resched flag and signals. 3173 * If we need to reschedule or deliver a signal, clean up 3174 * and return without going into the guest(s). 3175 * If the mmu_ready flag has been cleared, don't go into the 3176 * guest because that means a HPT resize operation is in progress. 3177 */ 3178 local_irq_disable(); 3179 hard_irq_disable(); 3180 if (lazy_irq_pending() || need_resched() || 3181 recheck_signals_and_mmu(&core_info)) { 3182 local_irq_enable(); 3183 vc->vcore_state = VCORE_INACTIVE; 3184 /* Unlock all except the primary vcore */ 3185 for (sub = 1; sub < core_info.n_subcores; ++sub) { 3186 pvc = core_info.vc[sub]; 3187 /* Put back on to the preempted vcores list */ 3188 kvmppc_vcore_preempt(pvc); 3189 spin_unlock(&pvc->lock); 3190 } 3191 for (i = 0; i < controlled_threads; ++i) 3192 kvmppc_release_hwthread(pcpu + i); 3193 return; 3194 } 3195 3196 kvmppc_clear_host_core(pcpu); 3197 3198 /* Decide on micro-threading (split-core) mode */ 3199 subcore_size = threads_per_subcore; 3200 cmd_bit = stat_bit = 0; 3201 split = core_info.n_subcores; 3202 sip = NULL; 3203 is_power8 = cpu_has_feature(CPU_FTR_ARCH_207S) 3204 && !cpu_has_feature(CPU_FTR_ARCH_300); 3205 3206 if (split > 1 || hpt_on_radix) { 3207 sip = &split_info; 3208 memset(&split_info, 0, sizeof(split_info)); 3209 for (sub = 0; sub < core_info.n_subcores; ++sub) 3210 split_info.vc[sub] = core_info.vc[sub]; 3211 3212 if (is_power8) { 3213 if (split == 2 && (dynamic_mt_modes & 2)) { 3214 cmd_bit = HID0_POWER8_1TO2LPAR; 3215 stat_bit = HID0_POWER8_2LPARMODE; 3216 } else { 3217 split = 4; 3218 cmd_bit = HID0_POWER8_1TO4LPAR; 3219 stat_bit = HID0_POWER8_4LPARMODE; 3220 } 3221 subcore_size = MAX_SMT_THREADS / split; 3222 split_info.rpr = mfspr(SPRN_RPR); 3223 split_info.pmmar = mfspr(SPRN_PMMAR); 3224 split_info.ldbar = mfspr(SPRN_LDBAR); 3225 split_info.subcore_size = subcore_size; 3226 } else { 3227 split_info.subcore_size = 1; 3228 if (hpt_on_radix) { 3229 /* Use the split_info for LPCR/LPIDR changes */ 3230 split_info.lpcr_req = vc->lpcr; 3231 split_info.lpidr_req = vc->kvm->arch.lpid; 3232 split_info.host_lpcr = vc->kvm->arch.host_lpcr; 3233 split_info.do_set = 1; 3234 } 3235 } 3236 3237 /* order writes to split_info before kvm_split_mode pointer */ 3238 smp_wmb(); 3239 } 3240 3241 for (thr = 0; thr < controlled_threads; ++thr) { 3242 struct paca_struct *paca = paca_ptrs[pcpu + thr]; 3243 3244 paca->kvm_hstate.tid = thr; 3245 paca->kvm_hstate.napping = 0; 3246 paca->kvm_hstate.kvm_split_mode = sip; 3247 } 3248 3249 /* Initiate micro-threading (split-core) on POWER8 if required */ 3250 if (cmd_bit) { 3251 unsigned long hid0 = mfspr(SPRN_HID0); 3252 3253 hid0 |= cmd_bit | HID0_POWER8_DYNLPARDIS; 3254 mb(); 3255 mtspr(SPRN_HID0, hid0); 3256 isync(); 3257 for (;;) { 3258 hid0 = mfspr(SPRN_HID0); 3259 if (hid0 & stat_bit) 3260 break; 3261 cpu_relax(); 3262 } 3263 } 3264 3265 /* 3266 * On POWER8, set RWMR register. 3267 * Since it only affects PURR and SPURR, it doesn't affect 3268 * the host, so we don't save/restore the host value. 3269 */ 3270 if (is_power8) { 3271 unsigned long rwmr_val = RWMR_RPA_P8_8THREAD; 3272 int n_online = atomic_read(&vc->online_count); 3273 3274 /* 3275 * Use the 8-thread value if we're doing split-core 3276 * or if the vcore's online count looks bogus. 3277 */ 3278 if (split == 1 && threads_per_subcore == MAX_SMT_THREADS && 3279 n_online >= 1 && n_online <= MAX_SMT_THREADS) 3280 rwmr_val = p8_rwmr_values[n_online]; 3281 mtspr(SPRN_RWMR, rwmr_val); 3282 } 3283 3284 /* Start all the threads */ 3285 active = 0; 3286 for (sub = 0; sub < core_info.n_subcores; ++sub) { 3287 thr = is_power8 ? subcore_thread_map[sub] : sub; 3288 thr0_done = false; 3289 active |= 1 << thr; 3290 pvc = core_info.vc[sub]; 3291 pvc->pcpu = pcpu + thr; 3292 for_each_runnable_thread(i, vcpu, pvc) { 3293 kvmppc_start_thread(vcpu, pvc); 3294 kvmppc_create_dtl_entry(vcpu, pvc); 3295 trace_kvm_guest_enter(vcpu); 3296 if (!vcpu->arch.ptid) 3297 thr0_done = true; 3298 active |= 1 << (thr + vcpu->arch.ptid); 3299 } 3300 /* 3301 * We need to start the first thread of each subcore 3302 * even if it doesn't have a vcpu. 3303 */ 3304 if (!thr0_done) 3305 kvmppc_start_thread(NULL, pvc); 3306 } 3307 3308 /* 3309 * Ensure that split_info.do_nap is set after setting 3310 * the vcore pointer in the PACA of the secondaries. 3311 */ 3312 smp_mb(); 3313 3314 /* 3315 * When doing micro-threading, poke the inactive threads as well. 3316 * This gets them to the nap instruction after kvm_do_nap, 3317 * which reduces the time taken to unsplit later. 3318 * For POWER9 HPT guest on radix host, we need all the secondary 3319 * threads woken up so they can do the LPCR/LPIDR change. 3320 */ 3321 if (cmd_bit || hpt_on_radix) { 3322 split_info.do_nap = 1; /* ask secondaries to nap when done */ 3323 for (thr = 1; thr < threads_per_subcore; ++thr) 3324 if (!(active & (1 << thr))) 3325 kvmppc_ipi_thread(pcpu + thr); 3326 } 3327 3328 vc->vcore_state = VCORE_RUNNING; 3329 preempt_disable(); 3330 3331 trace_kvmppc_run_core(vc, 0); 3332 3333 for (sub = 0; sub < core_info.n_subcores; ++sub) 3334 spin_unlock(&core_info.vc[sub]->lock); 3335 3336 guest_enter_irqoff(); 3337 3338 srcu_idx = srcu_read_lock(&vc->kvm->srcu); 3339 3340 this_cpu_disable_ftrace(); 3341 3342 /* 3343 * Interrupts will be enabled once we get into the guest, 3344 * so tell lockdep that we're about to enable interrupts. 3345 */ 3346 trace_hardirqs_on(); 3347 3348 trap = __kvmppc_vcore_entry(); 3349 3350 trace_hardirqs_off(); 3351 3352 this_cpu_enable_ftrace(); 3353 3354 srcu_read_unlock(&vc->kvm->srcu, srcu_idx); 3355 3356 set_irq_happened(trap); 3357 3358 spin_lock(&vc->lock); 3359 /* prevent other vcpu threads from doing kvmppc_start_thread() now */ 3360 vc->vcore_state = VCORE_EXITING; 3361 3362 /* wait for secondary threads to finish writing their state to memory */ 3363 kvmppc_wait_for_nap(controlled_threads); 3364 3365 /* Return to whole-core mode if we split the core earlier */ 3366 if (cmd_bit) { 3367 unsigned long hid0 = mfspr(SPRN_HID0); 3368 unsigned long loops = 0; 3369 3370 hid0 &= ~HID0_POWER8_DYNLPARDIS; 3371 stat_bit = HID0_POWER8_2LPARMODE | HID0_POWER8_4LPARMODE; 3372 mb(); 3373 mtspr(SPRN_HID0, hid0); 3374 isync(); 3375 for (;;) { 3376 hid0 = mfspr(SPRN_HID0); 3377 if (!(hid0 & stat_bit)) 3378 break; 3379 cpu_relax(); 3380 ++loops; 3381 } 3382 } else if (hpt_on_radix) { 3383 /* Wait for all threads to have seen final sync */ 3384 for (thr = 1; thr < controlled_threads; ++thr) { 3385 struct paca_struct *paca = paca_ptrs[pcpu + thr]; 3386 3387 while (paca->kvm_hstate.kvm_split_mode) { 3388 HMT_low(); 3389 barrier(); 3390 } 3391 HMT_medium(); 3392 } 3393 } 3394 split_info.do_nap = 0; 3395 3396 kvmppc_set_host_core(pcpu); 3397 3398 local_irq_enable(); 3399 guest_exit(); 3400 3401 /* Let secondaries go back to the offline loop */ 3402 for (i = 0; i < controlled_threads; ++i) { 3403 kvmppc_release_hwthread(pcpu + i); 3404 if (sip && sip->napped[i]) 3405 kvmppc_ipi_thread(pcpu + i); 3406 cpumask_clear_cpu(pcpu + i, &vc->kvm->arch.cpu_in_guest); 3407 } 3408 3409 spin_unlock(&vc->lock); 3410 3411 /* make sure updates to secondary vcpu structs are visible now */ 3412 smp_mb(); 3413 3414 preempt_enable(); 3415 3416 for (sub = 0; sub < core_info.n_subcores; ++sub) { 3417 pvc = core_info.vc[sub]; 3418 post_guest_process(pvc, pvc == vc); 3419 } 3420 3421 spin_lock(&vc->lock); 3422 3423 out: 3424 vc->vcore_state = VCORE_INACTIVE; 3425 trace_kvmppc_run_core(vc, 1); 3426 } 3427 3428 /* 3429 * Load up hypervisor-mode registers on P9. 3430 */ 3431 static int kvmhv_load_hv_regs_and_go(struct kvm_vcpu *vcpu, u64 time_limit, 3432 unsigned long lpcr) 3433 { 3434 struct kvmppc_vcore *vc = vcpu->arch.vcore; 3435 s64 hdec; 3436 u64 tb, purr, spurr; 3437 int trap; 3438 unsigned long host_hfscr = mfspr(SPRN_HFSCR); 3439 unsigned long host_ciabr = mfspr(SPRN_CIABR); 3440 unsigned long host_dawr = mfspr(SPRN_DAWR0); 3441 unsigned long host_dawrx = mfspr(SPRN_DAWRX0); 3442 unsigned long host_psscr = mfspr(SPRN_PSSCR); 3443 unsigned long host_pidr = mfspr(SPRN_PID); 3444 3445 hdec = time_limit - mftb(); 3446 if (hdec < 0) 3447 return BOOK3S_INTERRUPT_HV_DECREMENTER; 3448 mtspr(SPRN_HDEC, hdec); 3449 3450 if (vc->tb_offset) { 3451 u64 new_tb = mftb() + vc->tb_offset; 3452 mtspr(SPRN_TBU40, new_tb); 3453 tb = mftb(); 3454 if ((tb & 0xffffff) < (new_tb & 0xffffff)) 3455 mtspr(SPRN_TBU40, new_tb + 0x1000000); 3456 vc->tb_offset_applied = vc->tb_offset; 3457 } 3458 3459 if (vc->pcr) 3460 mtspr(SPRN_PCR, vc->pcr | PCR_MASK); 3461 mtspr(SPRN_DPDES, vc->dpdes); 3462 mtspr(SPRN_VTB, vc->vtb); 3463 3464 local_paca->kvm_hstate.host_purr = mfspr(SPRN_PURR); 3465 local_paca->kvm_hstate.host_spurr = mfspr(SPRN_SPURR); 3466 mtspr(SPRN_PURR, vcpu->arch.purr); 3467 mtspr(SPRN_SPURR, vcpu->arch.spurr); 3468 3469 if (dawr_enabled()) { 3470 mtspr(SPRN_DAWR0, vcpu->arch.dawr); 3471 mtspr(SPRN_DAWRX0, vcpu->arch.dawrx); 3472 } 3473 mtspr(SPRN_CIABR, vcpu->arch.ciabr); 3474 mtspr(SPRN_IC, vcpu->arch.ic); 3475 mtspr(SPRN_PID, vcpu->arch.pid); 3476 3477 mtspr(SPRN_PSSCR, vcpu->arch.psscr | PSSCR_EC | 3478 (local_paca->kvm_hstate.fake_suspend << PSSCR_FAKE_SUSPEND_LG)); 3479 3480 mtspr(SPRN_HFSCR, vcpu->arch.hfscr); 3481 3482 mtspr(SPRN_SPRG0, vcpu->arch.shregs.sprg0); 3483 mtspr(SPRN_SPRG1, vcpu->arch.shregs.sprg1); 3484 mtspr(SPRN_SPRG2, vcpu->arch.shregs.sprg2); 3485 mtspr(SPRN_SPRG3, vcpu->arch.shregs.sprg3); 3486 3487 mtspr(SPRN_AMOR, ~0UL); 3488 3489 mtspr(SPRN_LPCR, lpcr); 3490 isync(); 3491 3492 kvmppc_xive_push_vcpu(vcpu); 3493 3494 mtspr(SPRN_SRR0, vcpu->arch.shregs.srr0); 3495 mtspr(SPRN_SRR1, vcpu->arch.shregs.srr1); 3496 3497 trap = __kvmhv_vcpu_entry_p9(vcpu); 3498 3499 /* Advance host PURR/SPURR by the amount used by guest */ 3500 purr = mfspr(SPRN_PURR); 3501 spurr = mfspr(SPRN_SPURR); 3502 mtspr(SPRN_PURR, local_paca->kvm_hstate.host_purr + 3503 purr - vcpu->arch.purr); 3504 mtspr(SPRN_SPURR, local_paca->kvm_hstate.host_spurr + 3505 spurr - vcpu->arch.spurr); 3506 vcpu->arch.purr = purr; 3507 vcpu->arch.spurr = spurr; 3508 3509 vcpu->arch.ic = mfspr(SPRN_IC); 3510 vcpu->arch.pid = mfspr(SPRN_PID); 3511 vcpu->arch.psscr = mfspr(SPRN_PSSCR) & PSSCR_GUEST_VIS; 3512 3513 vcpu->arch.shregs.sprg0 = mfspr(SPRN_SPRG0); 3514 vcpu->arch.shregs.sprg1 = mfspr(SPRN_SPRG1); 3515 vcpu->arch.shregs.sprg2 = mfspr(SPRN_SPRG2); 3516 vcpu->arch.shregs.sprg3 = mfspr(SPRN_SPRG3); 3517 3518 /* Preserve PSSCR[FAKE_SUSPEND] until we've called kvmppc_save_tm_hv */ 3519 mtspr(SPRN_PSSCR, host_psscr | 3520 (local_paca->kvm_hstate.fake_suspend << PSSCR_FAKE_SUSPEND_LG)); 3521 mtspr(SPRN_HFSCR, host_hfscr); 3522 mtspr(SPRN_CIABR, host_ciabr); 3523 mtspr(SPRN_DAWR0, host_dawr); 3524 mtspr(SPRN_DAWRX0, host_dawrx); 3525 mtspr(SPRN_PID, host_pidr); 3526 3527 /* 3528 * Since this is radix, do a eieio; tlbsync; ptesync sequence in 3529 * case we interrupted the guest between a tlbie and a ptesync. 3530 */ 3531 asm volatile("eieio; tlbsync; ptesync"); 3532 3533 mtspr(SPRN_LPID, vcpu->kvm->arch.host_lpid); /* restore host LPID */ 3534 isync(); 3535 3536 vc->dpdes = mfspr(SPRN_DPDES); 3537 vc->vtb = mfspr(SPRN_VTB); 3538 mtspr(SPRN_DPDES, 0); 3539 if (vc->pcr) 3540 mtspr(SPRN_PCR, PCR_MASK); 3541 3542 if (vc->tb_offset_applied) { 3543 u64 new_tb = mftb() - vc->tb_offset_applied; 3544 mtspr(SPRN_TBU40, new_tb); 3545 tb = mftb(); 3546 if ((tb & 0xffffff) < (new_tb & 0xffffff)) 3547 mtspr(SPRN_TBU40, new_tb + 0x1000000); 3548 vc->tb_offset_applied = 0; 3549 } 3550 3551 mtspr(SPRN_HDEC, 0x7fffffff); 3552 mtspr(SPRN_LPCR, vcpu->kvm->arch.host_lpcr); 3553 3554 return trap; 3555 } 3556 3557 /* 3558 * Virtual-mode guest entry for POWER9 and later when the host and 3559 * guest are both using the radix MMU. The LPIDR has already been set. 3560 */ 3561 int kvmhv_p9_guest_entry(struct kvm_vcpu *vcpu, u64 time_limit, 3562 unsigned long lpcr) 3563 { 3564 struct kvmppc_vcore *vc = vcpu->arch.vcore; 3565 unsigned long host_dscr = mfspr(SPRN_DSCR); 3566 unsigned long host_tidr = mfspr(SPRN_TIDR); 3567 unsigned long host_iamr = mfspr(SPRN_IAMR); 3568 unsigned long host_amr = mfspr(SPRN_AMR); 3569 s64 dec; 3570 u64 tb; 3571 int trap, save_pmu; 3572 3573 dec = mfspr(SPRN_DEC); 3574 tb = mftb(); 3575 if (dec < 512) 3576 return BOOK3S_INTERRUPT_HV_DECREMENTER; 3577 local_paca->kvm_hstate.dec_expires = dec + tb; 3578 if (local_paca->kvm_hstate.dec_expires < time_limit) 3579 time_limit = local_paca->kvm_hstate.dec_expires; 3580 3581 vcpu->arch.ceded = 0; 3582 3583 kvmhv_save_host_pmu(); /* saves it to PACA kvm_hstate */ 3584 3585 kvmppc_subcore_enter_guest(); 3586 3587 vc->entry_exit_map = 1; 3588 vc->in_guest = 1; 3589 3590 if (vcpu->arch.vpa.pinned_addr) { 3591 struct lppaca *lp = vcpu->arch.vpa.pinned_addr; 3592 u32 yield_count = be32_to_cpu(lp->yield_count) + 1; 3593 lp->yield_count = cpu_to_be32(yield_count); 3594 vcpu->arch.vpa.dirty = 1; 3595 } 3596 3597 if (cpu_has_feature(CPU_FTR_TM) || 3598 cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) 3599 kvmppc_restore_tm_hv(vcpu, vcpu->arch.shregs.msr, true); 3600 3601 kvmhv_load_guest_pmu(vcpu); 3602 3603 msr_check_and_set(MSR_FP | MSR_VEC | MSR_VSX); 3604 load_fp_state(&vcpu->arch.fp); 3605 #ifdef CONFIG_ALTIVEC 3606 load_vr_state(&vcpu->arch.vr); 3607 #endif 3608 mtspr(SPRN_VRSAVE, vcpu->arch.vrsave); 3609 3610 mtspr(SPRN_DSCR, vcpu->arch.dscr); 3611 mtspr(SPRN_IAMR, vcpu->arch.iamr); 3612 mtspr(SPRN_PSPB, vcpu->arch.pspb); 3613 mtspr(SPRN_FSCR, vcpu->arch.fscr); 3614 mtspr(SPRN_TAR, vcpu->arch.tar); 3615 mtspr(SPRN_EBBHR, vcpu->arch.ebbhr); 3616 mtspr(SPRN_EBBRR, vcpu->arch.ebbrr); 3617 mtspr(SPRN_BESCR, vcpu->arch.bescr); 3618 mtspr(SPRN_WORT, vcpu->arch.wort); 3619 mtspr(SPRN_TIDR, vcpu->arch.tid); 3620 mtspr(SPRN_DAR, vcpu->arch.shregs.dar); 3621 mtspr(SPRN_DSISR, vcpu->arch.shregs.dsisr); 3622 mtspr(SPRN_AMR, vcpu->arch.amr); 3623 mtspr(SPRN_UAMOR, vcpu->arch.uamor); 3624 3625 if (!(vcpu->arch.ctrl & 1)) 3626 mtspr(SPRN_CTRLT, mfspr(SPRN_CTRLF) & ~1); 3627 3628 mtspr(SPRN_DEC, vcpu->arch.dec_expires - mftb()); 3629 3630 if (kvmhv_on_pseries()) { 3631 /* 3632 * We need to save and restore the guest visible part of the 3633 * psscr (i.e. using SPRN_PSSCR_PR) since the hypervisor 3634 * doesn't do this for us. Note only required if pseries since 3635 * this is done in kvmhv_load_hv_regs_and_go() below otherwise. 3636 */ 3637 unsigned long host_psscr; 3638 /* call our hypervisor to load up HV regs and go */ 3639 struct hv_guest_state hvregs; 3640 3641 host_psscr = mfspr(SPRN_PSSCR_PR); 3642 mtspr(SPRN_PSSCR_PR, vcpu->arch.psscr); 3643 kvmhv_save_hv_regs(vcpu, &hvregs); 3644 hvregs.lpcr = lpcr; 3645 vcpu->arch.regs.msr = vcpu->arch.shregs.msr; 3646 hvregs.version = HV_GUEST_STATE_VERSION; 3647 if (vcpu->arch.nested) { 3648 hvregs.lpid = vcpu->arch.nested->shadow_lpid; 3649 hvregs.vcpu_token = vcpu->arch.nested_vcpu_id; 3650 } else { 3651 hvregs.lpid = vcpu->kvm->arch.lpid; 3652 hvregs.vcpu_token = vcpu->vcpu_id; 3653 } 3654 hvregs.hdec_expiry = time_limit; 3655 trap = plpar_hcall_norets(H_ENTER_NESTED, __pa(&hvregs), 3656 __pa(&vcpu->arch.regs)); 3657 kvmhv_restore_hv_return_state(vcpu, &hvregs); 3658 vcpu->arch.shregs.msr = vcpu->arch.regs.msr; 3659 vcpu->arch.shregs.dar = mfspr(SPRN_DAR); 3660 vcpu->arch.shregs.dsisr = mfspr(SPRN_DSISR); 3661 vcpu->arch.psscr = mfspr(SPRN_PSSCR_PR); 3662 mtspr(SPRN_PSSCR_PR, host_psscr); 3663 3664 /* H_CEDE has to be handled now, not later */ 3665 if (trap == BOOK3S_INTERRUPT_SYSCALL && !vcpu->arch.nested && 3666 kvmppc_get_gpr(vcpu, 3) == H_CEDE) { 3667 kvmppc_nested_cede(vcpu); 3668 kvmppc_set_gpr(vcpu, 3, 0); 3669 trap = 0; 3670 } 3671 } else { 3672 trap = kvmhv_load_hv_regs_and_go(vcpu, time_limit, lpcr); 3673 } 3674 3675 vcpu->arch.slb_max = 0; 3676 dec = mfspr(SPRN_DEC); 3677 if (!(lpcr & LPCR_LD)) /* Sign extend if not using large decrementer */ 3678 dec = (s32) dec; 3679 tb = mftb(); 3680 vcpu->arch.dec_expires = dec + tb; 3681 vcpu->cpu = -1; 3682 vcpu->arch.thread_cpu = -1; 3683 vcpu->arch.ctrl = mfspr(SPRN_CTRLF); 3684 3685 vcpu->arch.iamr = mfspr(SPRN_IAMR); 3686 vcpu->arch.pspb = mfspr(SPRN_PSPB); 3687 vcpu->arch.fscr = mfspr(SPRN_FSCR); 3688 vcpu->arch.tar = mfspr(SPRN_TAR); 3689 vcpu->arch.ebbhr = mfspr(SPRN_EBBHR); 3690 vcpu->arch.ebbrr = mfspr(SPRN_EBBRR); 3691 vcpu->arch.bescr = mfspr(SPRN_BESCR); 3692 vcpu->arch.wort = mfspr(SPRN_WORT); 3693 vcpu->arch.tid = mfspr(SPRN_TIDR); 3694 vcpu->arch.amr = mfspr(SPRN_AMR); 3695 vcpu->arch.uamor = mfspr(SPRN_UAMOR); 3696 vcpu->arch.dscr = mfspr(SPRN_DSCR); 3697 3698 mtspr(SPRN_PSPB, 0); 3699 mtspr(SPRN_WORT, 0); 3700 mtspr(SPRN_UAMOR, 0); 3701 mtspr(SPRN_DSCR, host_dscr); 3702 mtspr(SPRN_TIDR, host_tidr); 3703 mtspr(SPRN_IAMR, host_iamr); 3704 mtspr(SPRN_PSPB, 0); 3705 3706 if (host_amr != vcpu->arch.amr) 3707 mtspr(SPRN_AMR, host_amr); 3708 3709 msr_check_and_set(MSR_FP | MSR_VEC | MSR_VSX); 3710 store_fp_state(&vcpu->arch.fp); 3711 #ifdef CONFIG_ALTIVEC 3712 store_vr_state(&vcpu->arch.vr); 3713 #endif 3714 vcpu->arch.vrsave = mfspr(SPRN_VRSAVE); 3715 3716 if (cpu_has_feature(CPU_FTR_TM) || 3717 cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) 3718 kvmppc_save_tm_hv(vcpu, vcpu->arch.shregs.msr, true); 3719 3720 save_pmu = 1; 3721 if (vcpu->arch.vpa.pinned_addr) { 3722 struct lppaca *lp = vcpu->arch.vpa.pinned_addr; 3723 u32 yield_count = be32_to_cpu(lp->yield_count) + 1; 3724 lp->yield_count = cpu_to_be32(yield_count); 3725 vcpu->arch.vpa.dirty = 1; 3726 save_pmu = lp->pmcregs_in_use; 3727 } 3728 /* Must save pmu if this guest is capable of running nested guests */ 3729 save_pmu |= nesting_enabled(vcpu->kvm); 3730 3731 kvmhv_save_guest_pmu(vcpu, save_pmu); 3732 3733 vc->entry_exit_map = 0x101; 3734 vc->in_guest = 0; 3735 3736 mtspr(SPRN_DEC, local_paca->kvm_hstate.dec_expires - mftb()); 3737 mtspr(SPRN_SPRG_VDSO_WRITE, local_paca->sprg_vdso); 3738 3739 kvmhv_load_host_pmu(); 3740 3741 kvmppc_subcore_exit_guest(); 3742 3743 return trap; 3744 } 3745 3746 /* 3747 * Wait for some other vcpu thread to execute us, and 3748 * wake us up when we need to handle something in the host. 3749 */ 3750 static void kvmppc_wait_for_exec(struct kvmppc_vcore *vc, 3751 struct kvm_vcpu *vcpu, int wait_state) 3752 { 3753 DEFINE_WAIT(wait); 3754 3755 prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state); 3756 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) { 3757 spin_unlock(&vc->lock); 3758 schedule(); 3759 spin_lock(&vc->lock); 3760 } 3761 finish_wait(&vcpu->arch.cpu_run, &wait); 3762 } 3763 3764 static void grow_halt_poll_ns(struct kvmppc_vcore *vc) 3765 { 3766 if (!halt_poll_ns_grow) 3767 return; 3768 3769 vc->halt_poll_ns *= halt_poll_ns_grow; 3770 if (vc->halt_poll_ns < halt_poll_ns_grow_start) 3771 vc->halt_poll_ns = halt_poll_ns_grow_start; 3772 } 3773 3774 static void shrink_halt_poll_ns(struct kvmppc_vcore *vc) 3775 { 3776 if (halt_poll_ns_shrink == 0) 3777 vc->halt_poll_ns = 0; 3778 else 3779 vc->halt_poll_ns /= halt_poll_ns_shrink; 3780 } 3781 3782 #ifdef CONFIG_KVM_XICS 3783 static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu) 3784 { 3785 if (!xics_on_xive()) 3786 return false; 3787 return vcpu->arch.irq_pending || vcpu->arch.xive_saved_state.pipr < 3788 vcpu->arch.xive_saved_state.cppr; 3789 } 3790 #else 3791 static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu) 3792 { 3793 return false; 3794 } 3795 #endif /* CONFIG_KVM_XICS */ 3796 3797 static bool kvmppc_vcpu_woken(struct kvm_vcpu *vcpu) 3798 { 3799 if (vcpu->arch.pending_exceptions || vcpu->arch.prodded || 3800 kvmppc_doorbell_pending(vcpu) || xive_interrupt_pending(vcpu)) 3801 return true; 3802 3803 return false; 3804 } 3805 3806 /* 3807 * Check to see if any of the runnable vcpus on the vcore have pending 3808 * exceptions or are no longer ceded 3809 */ 3810 static int kvmppc_vcore_check_block(struct kvmppc_vcore *vc) 3811 { 3812 struct kvm_vcpu *vcpu; 3813 int i; 3814 3815 for_each_runnable_thread(i, vcpu, vc) { 3816 if (!vcpu->arch.ceded || kvmppc_vcpu_woken(vcpu)) 3817 return 1; 3818 } 3819 3820 return 0; 3821 } 3822 3823 /* 3824 * All the vcpus in this vcore are idle, so wait for a decrementer 3825 * or external interrupt to one of the vcpus. vc->lock is held. 3826 */ 3827 static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc) 3828 { 3829 ktime_t cur, start_poll, start_wait; 3830 int do_sleep = 1; 3831 u64 block_ns; 3832 3833 /* Poll for pending exceptions and ceded state */ 3834 cur = start_poll = ktime_get(); 3835 if (vc->halt_poll_ns) { 3836 ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns); 3837 ++vc->runner->stat.halt_attempted_poll; 3838 3839 vc->vcore_state = VCORE_POLLING; 3840 spin_unlock(&vc->lock); 3841 3842 do { 3843 if (kvmppc_vcore_check_block(vc)) { 3844 do_sleep = 0; 3845 break; 3846 } 3847 cur = ktime_get(); 3848 } while (single_task_running() && ktime_before(cur, stop)); 3849 3850 spin_lock(&vc->lock); 3851 vc->vcore_state = VCORE_INACTIVE; 3852 3853 if (!do_sleep) { 3854 ++vc->runner->stat.halt_successful_poll; 3855 goto out; 3856 } 3857 } 3858 3859 prepare_to_rcuwait(&vc->wait); 3860 set_current_state(TASK_INTERRUPTIBLE); 3861 if (kvmppc_vcore_check_block(vc)) { 3862 finish_rcuwait(&vc->wait); 3863 do_sleep = 0; 3864 /* If we polled, count this as a successful poll */ 3865 if (vc->halt_poll_ns) 3866 ++vc->runner->stat.halt_successful_poll; 3867 goto out; 3868 } 3869 3870 start_wait = ktime_get(); 3871 3872 vc->vcore_state = VCORE_SLEEPING; 3873 trace_kvmppc_vcore_blocked(vc, 0); 3874 spin_unlock(&vc->lock); 3875 schedule(); 3876 finish_rcuwait(&vc->wait); 3877 spin_lock(&vc->lock); 3878 vc->vcore_state = VCORE_INACTIVE; 3879 trace_kvmppc_vcore_blocked(vc, 1); 3880 ++vc->runner->stat.halt_successful_wait; 3881 3882 cur = ktime_get(); 3883 3884 out: 3885 block_ns = ktime_to_ns(cur) - ktime_to_ns(start_poll); 3886 3887 /* Attribute wait time */ 3888 if (do_sleep) { 3889 vc->runner->stat.halt_wait_ns += 3890 ktime_to_ns(cur) - ktime_to_ns(start_wait); 3891 /* Attribute failed poll time */ 3892 if (vc->halt_poll_ns) 3893 vc->runner->stat.halt_poll_fail_ns += 3894 ktime_to_ns(start_wait) - 3895 ktime_to_ns(start_poll); 3896 } else { 3897 /* Attribute successful poll time */ 3898 if (vc->halt_poll_ns) 3899 vc->runner->stat.halt_poll_success_ns += 3900 ktime_to_ns(cur) - 3901 ktime_to_ns(start_poll); 3902 } 3903 3904 /* Adjust poll time */ 3905 if (halt_poll_ns) { 3906 if (block_ns <= vc->halt_poll_ns) 3907 ; 3908 /* We slept and blocked for longer than the max halt time */ 3909 else if (vc->halt_poll_ns && block_ns > halt_poll_ns) 3910 shrink_halt_poll_ns(vc); 3911 /* We slept and our poll time is too small */ 3912 else if (vc->halt_poll_ns < halt_poll_ns && 3913 block_ns < halt_poll_ns) 3914 grow_halt_poll_ns(vc); 3915 if (vc->halt_poll_ns > halt_poll_ns) 3916 vc->halt_poll_ns = halt_poll_ns; 3917 } else 3918 vc->halt_poll_ns = 0; 3919 3920 trace_kvmppc_vcore_wakeup(do_sleep, block_ns); 3921 } 3922 3923 /* 3924 * This never fails for a radix guest, as none of the operations it does 3925 * for a radix guest can fail or have a way to report failure. 3926 * kvmhv_run_single_vcpu() relies on this fact. 3927 */ 3928 static int kvmhv_setup_mmu(struct kvm_vcpu *vcpu) 3929 { 3930 int r = 0; 3931 struct kvm *kvm = vcpu->kvm; 3932 3933 mutex_lock(&kvm->arch.mmu_setup_lock); 3934 if (!kvm->arch.mmu_ready) { 3935 if (!kvm_is_radix(kvm)) 3936 r = kvmppc_hv_setup_htab_rma(vcpu); 3937 if (!r) { 3938 if (cpu_has_feature(CPU_FTR_ARCH_300)) 3939 kvmppc_setup_partition_table(kvm); 3940 kvm->arch.mmu_ready = 1; 3941 } 3942 } 3943 mutex_unlock(&kvm->arch.mmu_setup_lock); 3944 return r; 3945 } 3946 3947 static int kvmppc_run_vcpu(struct kvm_vcpu *vcpu) 3948 { 3949 struct kvm_run *run = vcpu->run; 3950 int n_ceded, i, r; 3951 struct kvmppc_vcore *vc; 3952 struct kvm_vcpu *v; 3953 3954 trace_kvmppc_run_vcpu_enter(vcpu); 3955 3956 run->exit_reason = 0; 3957 vcpu->arch.ret = RESUME_GUEST; 3958 vcpu->arch.trap = 0; 3959 kvmppc_update_vpas(vcpu); 3960 3961 /* 3962 * Synchronize with other threads in this virtual core 3963 */ 3964 vc = vcpu->arch.vcore; 3965 spin_lock(&vc->lock); 3966 vcpu->arch.ceded = 0; 3967 vcpu->arch.run_task = current; 3968 vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb()); 3969 vcpu->arch.state = KVMPPC_VCPU_RUNNABLE; 3970 vcpu->arch.busy_preempt = TB_NIL; 3971 WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], vcpu); 3972 ++vc->n_runnable; 3973 3974 /* 3975 * This happens the first time this is called for a vcpu. 3976 * If the vcore is already running, we may be able to start 3977 * this thread straight away and have it join in. 3978 */ 3979 if (!signal_pending(current)) { 3980 if ((vc->vcore_state == VCORE_PIGGYBACK || 3981 vc->vcore_state == VCORE_RUNNING) && 3982 !VCORE_IS_EXITING(vc)) { 3983 kvmppc_create_dtl_entry(vcpu, vc); 3984 kvmppc_start_thread(vcpu, vc); 3985 trace_kvm_guest_enter(vcpu); 3986 } else if (vc->vcore_state == VCORE_SLEEPING) { 3987 rcuwait_wake_up(&vc->wait); 3988 } 3989 3990 } 3991 3992 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE && 3993 !signal_pending(current)) { 3994 /* See if the MMU is ready to go */ 3995 if (!vcpu->kvm->arch.mmu_ready) { 3996 spin_unlock(&vc->lock); 3997 r = kvmhv_setup_mmu(vcpu); 3998 spin_lock(&vc->lock); 3999 if (r) { 4000 run->exit_reason = KVM_EXIT_FAIL_ENTRY; 4001 run->fail_entry. 4002 hardware_entry_failure_reason = 0; 4003 vcpu->arch.ret = r; 4004 break; 4005 } 4006 } 4007 4008 if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL) 4009 kvmppc_vcore_end_preempt(vc); 4010 4011 if (vc->vcore_state != VCORE_INACTIVE) { 4012 kvmppc_wait_for_exec(vc, vcpu, TASK_INTERRUPTIBLE); 4013 continue; 4014 } 4015 for_each_runnable_thread(i, v, vc) { 4016 kvmppc_core_prepare_to_enter(v); 4017 if (signal_pending(v->arch.run_task)) { 4018 kvmppc_remove_runnable(vc, v); 4019 v->stat.signal_exits++; 4020 v->run->exit_reason = KVM_EXIT_INTR; 4021 v->arch.ret = -EINTR; 4022 wake_up(&v->arch.cpu_run); 4023 } 4024 } 4025 if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE) 4026 break; 4027 n_ceded = 0; 4028 for_each_runnable_thread(i, v, vc) { 4029 if (!kvmppc_vcpu_woken(v)) 4030 n_ceded += v->arch.ceded; 4031 else 4032 v->arch.ceded = 0; 4033 } 4034 vc->runner = vcpu; 4035 if (n_ceded == vc->n_runnable) { 4036 kvmppc_vcore_blocked(vc); 4037 } else if (need_resched()) { 4038 kvmppc_vcore_preempt(vc); 4039 /* Let something else run */ 4040 cond_resched_lock(&vc->lock); 4041 if (vc->vcore_state == VCORE_PREEMPT) 4042 kvmppc_vcore_end_preempt(vc); 4043 } else { 4044 kvmppc_run_core(vc); 4045 } 4046 vc->runner = NULL; 4047 } 4048 4049 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE && 4050 (vc->vcore_state == VCORE_RUNNING || 4051 vc->vcore_state == VCORE_EXITING || 4052 vc->vcore_state == VCORE_PIGGYBACK)) 4053 kvmppc_wait_for_exec(vc, vcpu, TASK_UNINTERRUPTIBLE); 4054 4055 if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL) 4056 kvmppc_vcore_end_preempt(vc); 4057 4058 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) { 4059 kvmppc_remove_runnable(vc, vcpu); 4060 vcpu->stat.signal_exits++; 4061 run->exit_reason = KVM_EXIT_INTR; 4062 vcpu->arch.ret = -EINTR; 4063 } 4064 4065 if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) { 4066 /* Wake up some vcpu to run the core */ 4067 i = -1; 4068 v = next_runnable_thread(vc, &i); 4069 wake_up(&v->arch.cpu_run); 4070 } 4071 4072 trace_kvmppc_run_vcpu_exit(vcpu); 4073 spin_unlock(&vc->lock); 4074 return vcpu->arch.ret; 4075 } 4076 4077 int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit, 4078 unsigned long lpcr) 4079 { 4080 struct kvm_run *run = vcpu->run; 4081 int trap, r, pcpu; 4082 int srcu_idx, lpid; 4083 struct kvmppc_vcore *vc; 4084 struct kvm *kvm = vcpu->kvm; 4085 struct kvm_nested_guest *nested = vcpu->arch.nested; 4086 4087 trace_kvmppc_run_vcpu_enter(vcpu); 4088 4089 run->exit_reason = 0; 4090 vcpu->arch.ret = RESUME_GUEST; 4091 vcpu->arch.trap = 0; 4092 4093 vc = vcpu->arch.vcore; 4094 vcpu->arch.ceded = 0; 4095 vcpu->arch.run_task = current; 4096 vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb()); 4097 vcpu->arch.state = KVMPPC_VCPU_RUNNABLE; 4098 vcpu->arch.busy_preempt = TB_NIL; 4099 vcpu->arch.last_inst = KVM_INST_FETCH_FAILED; 4100 vc->runnable_threads[0] = vcpu; 4101 vc->n_runnable = 1; 4102 vc->runner = vcpu; 4103 4104 /* See if the MMU is ready to go */ 4105 if (!kvm->arch.mmu_ready) 4106 kvmhv_setup_mmu(vcpu); 4107 4108 if (need_resched()) 4109 cond_resched(); 4110 4111 kvmppc_update_vpas(vcpu); 4112 4113 init_vcore_to_run(vc); 4114 vc->preempt_tb = TB_NIL; 4115 4116 preempt_disable(); 4117 pcpu = smp_processor_id(); 4118 vc->pcpu = pcpu; 4119 kvmppc_prepare_radix_vcpu(vcpu, pcpu); 4120 4121 local_irq_disable(); 4122 hard_irq_disable(); 4123 if (signal_pending(current)) 4124 goto sigpend; 4125 if (lazy_irq_pending() || need_resched() || !kvm->arch.mmu_ready) 4126 goto out; 4127 4128 if (!nested) { 4129 kvmppc_core_prepare_to_enter(vcpu); 4130 if (vcpu->arch.doorbell_request) { 4131 vc->dpdes = 1; 4132 smp_wmb(); 4133 vcpu->arch.doorbell_request = 0; 4134 } 4135 if (test_bit(BOOK3S_IRQPRIO_EXTERNAL, 4136 &vcpu->arch.pending_exceptions)) 4137 lpcr |= LPCR_MER; 4138 } else if (vcpu->arch.pending_exceptions || 4139 vcpu->arch.doorbell_request || 4140 xive_interrupt_pending(vcpu)) { 4141 vcpu->arch.ret = RESUME_HOST; 4142 goto out; 4143 } 4144 4145 kvmppc_clear_host_core(pcpu); 4146 4147 local_paca->kvm_hstate.tid = 0; 4148 local_paca->kvm_hstate.napping = 0; 4149 local_paca->kvm_hstate.kvm_split_mode = NULL; 4150 kvmppc_start_thread(vcpu, vc); 4151 kvmppc_create_dtl_entry(vcpu, vc); 4152 trace_kvm_guest_enter(vcpu); 4153 4154 vc->vcore_state = VCORE_RUNNING; 4155 trace_kvmppc_run_core(vc, 0); 4156 4157 if (cpu_has_feature(CPU_FTR_HVMODE)) { 4158 lpid = nested ? nested->shadow_lpid : kvm->arch.lpid; 4159 mtspr(SPRN_LPID, lpid); 4160 isync(); 4161 kvmppc_check_need_tlb_flush(kvm, pcpu, nested); 4162 } 4163 4164 guest_enter_irqoff(); 4165 4166 srcu_idx = srcu_read_lock(&kvm->srcu); 4167 4168 this_cpu_disable_ftrace(); 4169 4170 /* Tell lockdep that we're about to enable interrupts */ 4171 trace_hardirqs_on(); 4172 4173 trap = kvmhv_p9_guest_entry(vcpu, time_limit, lpcr); 4174 vcpu->arch.trap = trap; 4175 4176 trace_hardirqs_off(); 4177 4178 this_cpu_enable_ftrace(); 4179 4180 srcu_read_unlock(&kvm->srcu, srcu_idx); 4181 4182 if (cpu_has_feature(CPU_FTR_HVMODE)) { 4183 mtspr(SPRN_LPID, kvm->arch.host_lpid); 4184 isync(); 4185 } 4186 4187 set_irq_happened(trap); 4188 4189 kvmppc_set_host_core(pcpu); 4190 4191 local_irq_enable(); 4192 guest_exit(); 4193 4194 cpumask_clear_cpu(pcpu, &kvm->arch.cpu_in_guest); 4195 4196 preempt_enable(); 4197 4198 /* 4199 * cancel pending decrementer exception if DEC is now positive, or if 4200 * entering a nested guest in which case the decrementer is now owned 4201 * by L2 and the L1 decrementer is provided in hdec_expires 4202 */ 4203 if (kvmppc_core_pending_dec(vcpu) && 4204 ((get_tb() < vcpu->arch.dec_expires) || 4205 (trap == BOOK3S_INTERRUPT_SYSCALL && 4206 kvmppc_get_gpr(vcpu, 3) == H_ENTER_NESTED))) 4207 kvmppc_core_dequeue_dec(vcpu); 4208 4209 trace_kvm_guest_exit(vcpu); 4210 r = RESUME_GUEST; 4211 if (trap) { 4212 if (!nested) 4213 r = kvmppc_handle_exit_hv(vcpu, current); 4214 else 4215 r = kvmppc_handle_nested_exit(vcpu); 4216 } 4217 vcpu->arch.ret = r; 4218 4219 if (is_kvmppc_resume_guest(r) && vcpu->arch.ceded && 4220 !kvmppc_vcpu_woken(vcpu)) { 4221 kvmppc_set_timer(vcpu); 4222 while (vcpu->arch.ceded && !kvmppc_vcpu_woken(vcpu)) { 4223 if (signal_pending(current)) { 4224 vcpu->stat.signal_exits++; 4225 run->exit_reason = KVM_EXIT_INTR; 4226 vcpu->arch.ret = -EINTR; 4227 break; 4228 } 4229 spin_lock(&vc->lock); 4230 kvmppc_vcore_blocked(vc); 4231 spin_unlock(&vc->lock); 4232 } 4233 } 4234 vcpu->arch.ceded = 0; 4235 4236 vc->vcore_state = VCORE_INACTIVE; 4237 trace_kvmppc_run_core(vc, 1); 4238 4239 done: 4240 kvmppc_remove_runnable(vc, vcpu); 4241 trace_kvmppc_run_vcpu_exit(vcpu); 4242 4243 return vcpu->arch.ret; 4244 4245 sigpend: 4246 vcpu->stat.signal_exits++; 4247 run->exit_reason = KVM_EXIT_INTR; 4248 vcpu->arch.ret = -EINTR; 4249 out: 4250 local_irq_enable(); 4251 preempt_enable(); 4252 goto done; 4253 } 4254 4255 static int kvmppc_vcpu_run_hv(struct kvm_vcpu *vcpu) 4256 { 4257 struct kvm_run *run = vcpu->run; 4258 int r; 4259 int srcu_idx; 4260 unsigned long ebb_regs[3] = {}; /* shut up GCC */ 4261 unsigned long user_tar = 0; 4262 unsigned int user_vrsave; 4263 struct kvm *kvm; 4264 4265 if (!vcpu->arch.sane) { 4266 run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 4267 return -EINVAL; 4268 } 4269 4270 /* 4271 * Don't allow entry with a suspended transaction, because 4272 * the guest entry/exit code will lose it. 4273 * If the guest has TM enabled, save away their TM-related SPRs 4274 * (they will get restored by the TM unavailable interrupt). 4275 */ 4276 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 4277 if (cpu_has_feature(CPU_FTR_TM) && current->thread.regs && 4278 (current->thread.regs->msr & MSR_TM)) { 4279 if (MSR_TM_ACTIVE(current->thread.regs->msr)) { 4280 run->exit_reason = KVM_EXIT_FAIL_ENTRY; 4281 run->fail_entry.hardware_entry_failure_reason = 0; 4282 return -EINVAL; 4283 } 4284 /* Enable TM so we can read the TM SPRs */ 4285 mtmsr(mfmsr() | MSR_TM); 4286 current->thread.tm_tfhar = mfspr(SPRN_TFHAR); 4287 current->thread.tm_tfiar = mfspr(SPRN_TFIAR); 4288 current->thread.tm_texasr = mfspr(SPRN_TEXASR); 4289 current->thread.regs->msr &= ~MSR_TM; 4290 } 4291 #endif 4292 4293 /* 4294 * Force online to 1 for the sake of old userspace which doesn't 4295 * set it. 4296 */ 4297 if (!vcpu->arch.online) { 4298 atomic_inc(&vcpu->arch.vcore->online_count); 4299 vcpu->arch.online = 1; 4300 } 4301 4302 kvmppc_core_prepare_to_enter(vcpu); 4303 4304 /* No need to go into the guest when all we'll do is come back out */ 4305 if (signal_pending(current)) { 4306 run->exit_reason = KVM_EXIT_INTR; 4307 return -EINTR; 4308 } 4309 4310 kvm = vcpu->kvm; 4311 atomic_inc(&kvm->arch.vcpus_running); 4312 /* Order vcpus_running vs. mmu_ready, see kvmppc_alloc_reset_hpt */ 4313 smp_mb(); 4314 4315 flush_all_to_thread(current); 4316 4317 /* Save userspace EBB and other register values */ 4318 if (cpu_has_feature(CPU_FTR_ARCH_207S)) { 4319 ebb_regs[0] = mfspr(SPRN_EBBHR); 4320 ebb_regs[1] = mfspr(SPRN_EBBRR); 4321 ebb_regs[2] = mfspr(SPRN_BESCR); 4322 user_tar = mfspr(SPRN_TAR); 4323 } 4324 user_vrsave = mfspr(SPRN_VRSAVE); 4325 4326 vcpu->arch.waitp = &vcpu->arch.vcore->wait; 4327 vcpu->arch.pgdir = kvm->mm->pgd; 4328 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; 4329 4330 do { 4331 /* 4332 * The early POWER9 chips that can't mix radix and HPT threads 4333 * on the same core also need the workaround for the problem 4334 * where the TLB would prefetch entries in the guest exit path 4335 * for radix guests using the guest PIDR value and LPID 0. 4336 * The workaround is in the old path (kvmppc_run_vcpu()) 4337 * but not the new path (kvmhv_run_single_vcpu()). 4338 */ 4339 if (kvm->arch.threads_indep && kvm_is_radix(kvm) && 4340 !no_mixing_hpt_and_radix) 4341 r = kvmhv_run_single_vcpu(vcpu, ~(u64)0, 4342 vcpu->arch.vcore->lpcr); 4343 else 4344 r = kvmppc_run_vcpu(vcpu); 4345 4346 if (run->exit_reason == KVM_EXIT_PAPR_HCALL && 4347 !(vcpu->arch.shregs.msr & MSR_PR)) { 4348 trace_kvm_hcall_enter(vcpu); 4349 r = kvmppc_pseries_do_hcall(vcpu); 4350 trace_kvm_hcall_exit(vcpu, r); 4351 kvmppc_core_prepare_to_enter(vcpu); 4352 } else if (r == RESUME_PAGE_FAULT) { 4353 srcu_idx = srcu_read_lock(&kvm->srcu); 4354 r = kvmppc_book3s_hv_page_fault(vcpu, 4355 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); 4356 srcu_read_unlock(&kvm->srcu, srcu_idx); 4357 } else if (r == RESUME_PASSTHROUGH) { 4358 if (WARN_ON(xics_on_xive())) 4359 r = H_SUCCESS; 4360 else 4361 r = kvmppc_xics_rm_complete(vcpu, 0); 4362 } 4363 } while (is_kvmppc_resume_guest(r)); 4364 4365 /* Restore userspace EBB and other register values */ 4366 if (cpu_has_feature(CPU_FTR_ARCH_207S)) { 4367 mtspr(SPRN_EBBHR, ebb_regs[0]); 4368 mtspr(SPRN_EBBRR, ebb_regs[1]); 4369 mtspr(SPRN_BESCR, ebb_regs[2]); 4370 mtspr(SPRN_TAR, user_tar); 4371 mtspr(SPRN_FSCR, current->thread.fscr); 4372 } 4373 mtspr(SPRN_VRSAVE, user_vrsave); 4374 4375 vcpu->arch.state = KVMPPC_VCPU_NOTREADY; 4376 atomic_dec(&kvm->arch.vcpus_running); 4377 return r; 4378 } 4379 4380 static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps, 4381 int shift, int sllp) 4382 { 4383 (*sps)->page_shift = shift; 4384 (*sps)->slb_enc = sllp; 4385 (*sps)->enc[0].page_shift = shift; 4386 (*sps)->enc[0].pte_enc = kvmppc_pgsize_lp_encoding(shift, shift); 4387 /* 4388 * Add 16MB MPSS support (may get filtered out by userspace) 4389 */ 4390 if (shift != 24) { 4391 int penc = kvmppc_pgsize_lp_encoding(shift, 24); 4392 if (penc != -1) { 4393 (*sps)->enc[1].page_shift = 24; 4394 (*sps)->enc[1].pte_enc = penc; 4395 } 4396 } 4397 (*sps)++; 4398 } 4399 4400 static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm, 4401 struct kvm_ppc_smmu_info *info) 4402 { 4403 struct kvm_ppc_one_seg_page_size *sps; 4404 4405 /* 4406 * POWER7, POWER8 and POWER9 all support 32 storage keys for data. 4407 * POWER7 doesn't support keys for instruction accesses, 4408 * POWER8 and POWER9 do. 4409 */ 4410 info->data_keys = 32; 4411 info->instr_keys = cpu_has_feature(CPU_FTR_ARCH_207S) ? 32 : 0; 4412 4413 /* POWER7, 8 and 9 all have 1T segments and 32-entry SLB */ 4414 info->flags = KVM_PPC_PAGE_SIZES_REAL | KVM_PPC_1T_SEGMENTS; 4415 info->slb_size = 32; 4416 4417 /* We only support these sizes for now, and no muti-size segments */ 4418 sps = &info->sps[0]; 4419 kvmppc_add_seg_page_size(&sps, 12, 0); 4420 kvmppc_add_seg_page_size(&sps, 16, SLB_VSID_L | SLB_VSID_LP_01); 4421 kvmppc_add_seg_page_size(&sps, 24, SLB_VSID_L); 4422 4423 /* If running as a nested hypervisor, we don't support HPT guests */ 4424 if (kvmhv_on_pseries()) 4425 info->flags |= KVM_PPC_NO_HASH; 4426 4427 return 0; 4428 } 4429 4430 /* 4431 * Get (and clear) the dirty memory log for a memory slot. 4432 */ 4433 static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm, 4434 struct kvm_dirty_log *log) 4435 { 4436 struct kvm_memslots *slots; 4437 struct kvm_memory_slot *memslot; 4438 int i, r; 4439 unsigned long n; 4440 unsigned long *buf, *p; 4441 struct kvm_vcpu *vcpu; 4442 4443 mutex_lock(&kvm->slots_lock); 4444 4445 r = -EINVAL; 4446 if (log->slot >= KVM_USER_MEM_SLOTS) 4447 goto out; 4448 4449 slots = kvm_memslots(kvm); 4450 memslot = id_to_memslot(slots, log->slot); 4451 r = -ENOENT; 4452 if (!memslot || !memslot->dirty_bitmap) 4453 goto out; 4454 4455 /* 4456 * Use second half of bitmap area because both HPT and radix 4457 * accumulate bits in the first half. 4458 */ 4459 n = kvm_dirty_bitmap_bytes(memslot); 4460 buf = memslot->dirty_bitmap + n / sizeof(long); 4461 memset(buf, 0, n); 4462 4463 if (kvm_is_radix(kvm)) 4464 r = kvmppc_hv_get_dirty_log_radix(kvm, memslot, buf); 4465 else 4466 r = kvmppc_hv_get_dirty_log_hpt(kvm, memslot, buf); 4467 if (r) 4468 goto out; 4469 4470 /* 4471 * We accumulate dirty bits in the first half of the 4472 * memslot's dirty_bitmap area, for when pages are paged 4473 * out or modified by the host directly. Pick up these 4474 * bits and add them to the map. 4475 */ 4476 p = memslot->dirty_bitmap; 4477 for (i = 0; i < n / sizeof(long); ++i) 4478 buf[i] |= xchg(&p[i], 0); 4479 4480 /* Harvest dirty bits from VPA and DTL updates */ 4481 /* Note: we never modify the SLB shadow buffer areas */ 4482 kvm_for_each_vcpu(i, vcpu, kvm) { 4483 spin_lock(&vcpu->arch.vpa_update_lock); 4484 kvmppc_harvest_vpa_dirty(&vcpu->arch.vpa, memslot, buf); 4485 kvmppc_harvest_vpa_dirty(&vcpu->arch.dtl, memslot, buf); 4486 spin_unlock(&vcpu->arch.vpa_update_lock); 4487 } 4488 4489 r = -EFAULT; 4490 if (copy_to_user(log->dirty_bitmap, buf, n)) 4491 goto out; 4492 4493 r = 0; 4494 out: 4495 mutex_unlock(&kvm->slots_lock); 4496 return r; 4497 } 4498 4499 static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *slot) 4500 { 4501 vfree(slot->arch.rmap); 4502 slot->arch.rmap = NULL; 4503 } 4504 4505 static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm, 4506 struct kvm_memory_slot *slot, 4507 const struct kvm_userspace_memory_region *mem, 4508 enum kvm_mr_change change) 4509 { 4510 unsigned long npages = mem->memory_size >> PAGE_SHIFT; 4511 4512 if (change == KVM_MR_CREATE) { 4513 slot->arch.rmap = vzalloc(array_size(npages, 4514 sizeof(*slot->arch.rmap))); 4515 if (!slot->arch.rmap) 4516 return -ENOMEM; 4517 } 4518 4519 return 0; 4520 } 4521 4522 static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm, 4523 const struct kvm_userspace_memory_region *mem, 4524 const struct kvm_memory_slot *old, 4525 const struct kvm_memory_slot *new, 4526 enum kvm_mr_change change) 4527 { 4528 unsigned long npages = mem->memory_size >> PAGE_SHIFT; 4529 4530 /* 4531 * If we are making a new memslot, it might make 4532 * some address that was previously cached as emulated 4533 * MMIO be no longer emulated MMIO, so invalidate 4534 * all the caches of emulated MMIO translations. 4535 */ 4536 if (npages) 4537 atomic64_inc(&kvm->arch.mmio_update); 4538 4539 /* 4540 * For change == KVM_MR_MOVE or KVM_MR_DELETE, higher levels 4541 * have already called kvm_arch_flush_shadow_memslot() to 4542 * flush shadow mappings. For KVM_MR_CREATE we have no 4543 * previous mappings. So the only case to handle is 4544 * KVM_MR_FLAGS_ONLY when the KVM_MEM_LOG_DIRTY_PAGES bit 4545 * has been changed. 4546 * For radix guests, we flush on setting KVM_MEM_LOG_DIRTY_PAGES 4547 * to get rid of any THP PTEs in the partition-scoped page tables 4548 * so we can track dirtiness at the page level; we flush when 4549 * clearing KVM_MEM_LOG_DIRTY_PAGES so that we can go back to 4550 * using THP PTEs. 4551 */ 4552 if (change == KVM_MR_FLAGS_ONLY && kvm_is_radix(kvm) && 4553 ((new->flags ^ old->flags) & KVM_MEM_LOG_DIRTY_PAGES)) 4554 kvmppc_radix_flush_memslot(kvm, old); 4555 /* 4556 * If UV hasn't yet called H_SVM_INIT_START, don't register memslots. 4557 */ 4558 if (!kvm->arch.secure_guest) 4559 return; 4560 4561 switch (change) { 4562 case KVM_MR_CREATE: 4563 /* 4564 * @TODO kvmppc_uvmem_memslot_create() can fail and 4565 * return error. Fix this. 4566 */ 4567 kvmppc_uvmem_memslot_create(kvm, new); 4568 break; 4569 case KVM_MR_DELETE: 4570 kvmppc_uvmem_memslot_delete(kvm, old); 4571 break; 4572 default: 4573 /* TODO: Handle KVM_MR_MOVE */ 4574 break; 4575 } 4576 } 4577 4578 /* 4579 * Update LPCR values in kvm->arch and in vcores. 4580 * Caller must hold kvm->arch.mmu_setup_lock (for mutual exclusion 4581 * of kvm->arch.lpcr update). 4582 */ 4583 void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask) 4584 { 4585 long int i; 4586 u32 cores_done = 0; 4587 4588 if ((kvm->arch.lpcr & mask) == lpcr) 4589 return; 4590 4591 kvm->arch.lpcr = (kvm->arch.lpcr & ~mask) | lpcr; 4592 4593 for (i = 0; i < KVM_MAX_VCORES; ++i) { 4594 struct kvmppc_vcore *vc = kvm->arch.vcores[i]; 4595 if (!vc) 4596 continue; 4597 spin_lock(&vc->lock); 4598 vc->lpcr = (vc->lpcr & ~mask) | lpcr; 4599 spin_unlock(&vc->lock); 4600 if (++cores_done >= kvm->arch.online_vcores) 4601 break; 4602 } 4603 } 4604 4605 void kvmppc_setup_partition_table(struct kvm *kvm) 4606 { 4607 unsigned long dw0, dw1; 4608 4609 if (!kvm_is_radix(kvm)) { 4610 /* PS field - page size for VRMA */ 4611 dw0 = ((kvm->arch.vrma_slb_v & SLB_VSID_L) >> 1) | 4612 ((kvm->arch.vrma_slb_v & SLB_VSID_LP) << 1); 4613 /* HTABSIZE and HTABORG fields */ 4614 dw0 |= kvm->arch.sdr1; 4615 4616 /* Second dword as set by userspace */ 4617 dw1 = kvm->arch.process_table; 4618 } else { 4619 dw0 = PATB_HR | radix__get_tree_size() | 4620 __pa(kvm->arch.pgtable) | RADIX_PGD_INDEX_SIZE; 4621 dw1 = PATB_GR | kvm->arch.process_table; 4622 } 4623 kvmhv_set_ptbl_entry(kvm->arch.lpid, dw0, dw1); 4624 } 4625 4626 /* 4627 * Set up HPT (hashed page table) and RMA (real-mode area). 4628 * Must be called with kvm->arch.mmu_setup_lock held. 4629 */ 4630 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu) 4631 { 4632 int err = 0; 4633 struct kvm *kvm = vcpu->kvm; 4634 unsigned long hva; 4635 struct kvm_memory_slot *memslot; 4636 struct vm_area_struct *vma; 4637 unsigned long lpcr = 0, senc; 4638 unsigned long psize, porder; 4639 int srcu_idx; 4640 4641 /* Allocate hashed page table (if not done already) and reset it */ 4642 if (!kvm->arch.hpt.virt) { 4643 int order = KVM_DEFAULT_HPT_ORDER; 4644 struct kvm_hpt_info info; 4645 4646 err = kvmppc_allocate_hpt(&info, order); 4647 /* If we get here, it means userspace didn't specify a 4648 * size explicitly. So, try successively smaller 4649 * sizes if the default failed. */ 4650 while ((err == -ENOMEM) && --order >= PPC_MIN_HPT_ORDER) 4651 err = kvmppc_allocate_hpt(&info, order); 4652 4653 if (err < 0) { 4654 pr_err("KVM: Couldn't alloc HPT\n"); 4655 goto out; 4656 } 4657 4658 kvmppc_set_hpt(kvm, &info); 4659 } 4660 4661 /* Look up the memslot for guest physical address 0 */ 4662 srcu_idx = srcu_read_lock(&kvm->srcu); 4663 memslot = gfn_to_memslot(kvm, 0); 4664 4665 /* We must have some memory at 0 by now */ 4666 err = -EINVAL; 4667 if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) 4668 goto out_srcu; 4669 4670 /* Look up the VMA for the start of this memory slot */ 4671 hva = memslot->userspace_addr; 4672 mmap_read_lock(kvm->mm); 4673 vma = find_vma(kvm->mm, hva); 4674 if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO)) 4675 goto up_out; 4676 4677 psize = vma_kernel_pagesize(vma); 4678 4679 mmap_read_unlock(kvm->mm); 4680 4681 /* We can handle 4k, 64k or 16M pages in the VRMA */ 4682 if (psize >= 0x1000000) 4683 psize = 0x1000000; 4684 else if (psize >= 0x10000) 4685 psize = 0x10000; 4686 else 4687 psize = 0x1000; 4688 porder = __ilog2(psize); 4689 4690 senc = slb_pgsize_encoding(psize); 4691 kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T | 4692 (VRMA_VSID << SLB_VSID_SHIFT_1T); 4693 /* Create HPTEs in the hash page table for the VRMA */ 4694 kvmppc_map_vrma(vcpu, memslot, porder); 4695 4696 /* Update VRMASD field in the LPCR */ 4697 if (!cpu_has_feature(CPU_FTR_ARCH_300)) { 4698 /* the -4 is to account for senc values starting at 0x10 */ 4699 lpcr = senc << (LPCR_VRMASD_SH - 4); 4700 kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD); 4701 } 4702 4703 /* Order updates to kvm->arch.lpcr etc. vs. mmu_ready */ 4704 smp_wmb(); 4705 err = 0; 4706 out_srcu: 4707 srcu_read_unlock(&kvm->srcu, srcu_idx); 4708 out: 4709 return err; 4710 4711 up_out: 4712 mmap_read_unlock(kvm->mm); 4713 goto out_srcu; 4714 } 4715 4716 /* 4717 * Must be called with kvm->arch.mmu_setup_lock held and 4718 * mmu_ready = 0 and no vcpus running. 4719 */ 4720 int kvmppc_switch_mmu_to_hpt(struct kvm *kvm) 4721 { 4722 if (nesting_enabled(kvm)) 4723 kvmhv_release_all_nested(kvm); 4724 kvmppc_rmap_reset(kvm); 4725 kvm->arch.process_table = 0; 4726 /* Mutual exclusion with kvm_unmap_hva_range etc. */ 4727 spin_lock(&kvm->mmu_lock); 4728 kvm->arch.radix = 0; 4729 spin_unlock(&kvm->mmu_lock); 4730 kvmppc_free_radix(kvm); 4731 kvmppc_update_lpcr(kvm, LPCR_VPM1, 4732 LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR); 4733 return 0; 4734 } 4735 4736 /* 4737 * Must be called with kvm->arch.mmu_setup_lock held and 4738 * mmu_ready = 0 and no vcpus running. 4739 */ 4740 int kvmppc_switch_mmu_to_radix(struct kvm *kvm) 4741 { 4742 int err; 4743 4744 err = kvmppc_init_vm_radix(kvm); 4745 if (err) 4746 return err; 4747 kvmppc_rmap_reset(kvm); 4748 /* Mutual exclusion with kvm_unmap_hva_range etc. */ 4749 spin_lock(&kvm->mmu_lock); 4750 kvm->arch.radix = 1; 4751 spin_unlock(&kvm->mmu_lock); 4752 kvmppc_free_hpt(&kvm->arch.hpt); 4753 kvmppc_update_lpcr(kvm, LPCR_UPRT | LPCR_GTSE | LPCR_HR, 4754 LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR); 4755 return 0; 4756 } 4757 4758 #ifdef CONFIG_KVM_XICS 4759 /* 4760 * Allocate a per-core structure for managing state about which cores are 4761 * running in the host versus the guest and for exchanging data between 4762 * real mode KVM and CPU running in the host. 4763 * This is only done for the first VM. 4764 * The allocated structure stays even if all VMs have stopped. 4765 * It is only freed when the kvm-hv module is unloaded. 4766 * It's OK for this routine to fail, we just don't support host 4767 * core operations like redirecting H_IPI wakeups. 4768 */ 4769 void kvmppc_alloc_host_rm_ops(void) 4770 { 4771 struct kvmppc_host_rm_ops *ops; 4772 unsigned long l_ops; 4773 int cpu, core; 4774 int size; 4775 4776 /* Not the first time here ? */ 4777 if (kvmppc_host_rm_ops_hv != NULL) 4778 return; 4779 4780 ops = kzalloc(sizeof(struct kvmppc_host_rm_ops), GFP_KERNEL); 4781 if (!ops) 4782 return; 4783 4784 size = cpu_nr_cores() * sizeof(struct kvmppc_host_rm_core); 4785 ops->rm_core = kzalloc(size, GFP_KERNEL); 4786 4787 if (!ops->rm_core) { 4788 kfree(ops); 4789 return; 4790 } 4791 4792 cpus_read_lock(); 4793 4794 for (cpu = 0; cpu < nr_cpu_ids; cpu += threads_per_core) { 4795 if (!cpu_online(cpu)) 4796 continue; 4797 4798 core = cpu >> threads_shift; 4799 ops->rm_core[core].rm_state.in_host = 1; 4800 } 4801 4802 ops->vcpu_kick = kvmppc_fast_vcpu_kick_hv; 4803 4804 /* 4805 * Make the contents of the kvmppc_host_rm_ops structure visible 4806 * to other CPUs before we assign it to the global variable. 4807 * Do an atomic assignment (no locks used here), but if someone 4808 * beats us to it, just free our copy and return. 4809 */ 4810 smp_wmb(); 4811 l_ops = (unsigned long) ops; 4812 4813 if (cmpxchg64((unsigned long *)&kvmppc_host_rm_ops_hv, 0, l_ops)) { 4814 cpus_read_unlock(); 4815 kfree(ops->rm_core); 4816 kfree(ops); 4817 return; 4818 } 4819 4820 cpuhp_setup_state_nocalls_cpuslocked(CPUHP_KVM_PPC_BOOK3S_PREPARE, 4821 "ppc/kvm_book3s:prepare", 4822 kvmppc_set_host_core, 4823 kvmppc_clear_host_core); 4824 cpus_read_unlock(); 4825 } 4826 4827 void kvmppc_free_host_rm_ops(void) 4828 { 4829 if (kvmppc_host_rm_ops_hv) { 4830 cpuhp_remove_state_nocalls(CPUHP_KVM_PPC_BOOK3S_PREPARE); 4831 kfree(kvmppc_host_rm_ops_hv->rm_core); 4832 kfree(kvmppc_host_rm_ops_hv); 4833 kvmppc_host_rm_ops_hv = NULL; 4834 } 4835 } 4836 #endif 4837 4838 static int kvmppc_core_init_vm_hv(struct kvm *kvm) 4839 { 4840 unsigned long lpcr, lpid; 4841 char buf[32]; 4842 int ret; 4843 4844 mutex_init(&kvm->arch.uvmem_lock); 4845 INIT_LIST_HEAD(&kvm->arch.uvmem_pfns); 4846 mutex_init(&kvm->arch.mmu_setup_lock); 4847 4848 /* Allocate the guest's logical partition ID */ 4849 4850 lpid = kvmppc_alloc_lpid(); 4851 if ((long)lpid < 0) 4852 return -ENOMEM; 4853 kvm->arch.lpid = lpid; 4854 4855 kvmppc_alloc_host_rm_ops(); 4856 4857 kvmhv_vm_nested_init(kvm); 4858 4859 /* 4860 * Since we don't flush the TLB when tearing down a VM, 4861 * and this lpid might have previously been used, 4862 * make sure we flush on each core before running the new VM. 4863 * On POWER9, the tlbie in mmu_partition_table_set_entry() 4864 * does this flush for us. 4865 */ 4866 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 4867 cpumask_setall(&kvm->arch.need_tlb_flush); 4868 4869 /* Start out with the default set of hcalls enabled */ 4870 memcpy(kvm->arch.enabled_hcalls, default_enabled_hcalls, 4871 sizeof(kvm->arch.enabled_hcalls)); 4872 4873 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 4874 kvm->arch.host_sdr1 = mfspr(SPRN_SDR1); 4875 4876 /* Init LPCR for virtual RMA mode */ 4877 if (cpu_has_feature(CPU_FTR_HVMODE)) { 4878 kvm->arch.host_lpid = mfspr(SPRN_LPID); 4879 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR); 4880 lpcr &= LPCR_PECE | LPCR_LPES; 4881 } else { 4882 lpcr = 0; 4883 } 4884 lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE | 4885 LPCR_VPM0 | LPCR_VPM1; 4886 kvm->arch.vrma_slb_v = SLB_VSID_B_1T | 4887 (VRMA_VSID << SLB_VSID_SHIFT_1T); 4888 /* On POWER8 turn on online bit to enable PURR/SPURR */ 4889 if (cpu_has_feature(CPU_FTR_ARCH_207S)) 4890 lpcr |= LPCR_ONL; 4891 /* 4892 * On POWER9, VPM0 bit is reserved (VPM0=1 behaviour is assumed) 4893 * Set HVICE bit to enable hypervisor virtualization interrupts. 4894 * Set HEIC to prevent OS interrupts to go to hypervisor (should 4895 * be unnecessary but better safe than sorry in case we re-enable 4896 * EE in HV mode with this LPCR still set) 4897 */ 4898 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 4899 lpcr &= ~LPCR_VPM0; 4900 lpcr |= LPCR_HVICE | LPCR_HEIC; 4901 4902 /* 4903 * If xive is enabled, we route 0x500 interrupts directly 4904 * to the guest. 4905 */ 4906 if (xics_on_xive()) 4907 lpcr |= LPCR_LPES; 4908 } 4909 4910 /* 4911 * If the host uses radix, the guest starts out as radix. 4912 */ 4913 if (radix_enabled()) { 4914 kvm->arch.radix = 1; 4915 kvm->arch.mmu_ready = 1; 4916 lpcr &= ~LPCR_VPM1; 4917 lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR; 4918 ret = kvmppc_init_vm_radix(kvm); 4919 if (ret) { 4920 kvmppc_free_lpid(kvm->arch.lpid); 4921 return ret; 4922 } 4923 kvmppc_setup_partition_table(kvm); 4924 } 4925 4926 kvm->arch.lpcr = lpcr; 4927 4928 /* Initialization for future HPT resizes */ 4929 kvm->arch.resize_hpt = NULL; 4930 4931 /* 4932 * Work out how many sets the TLB has, for the use of 4933 * the TLB invalidation loop in book3s_hv_rmhandlers.S. 4934 */ 4935 if (radix_enabled()) 4936 kvm->arch.tlb_sets = POWER9_TLB_SETS_RADIX; /* 128 */ 4937 else if (cpu_has_feature(CPU_FTR_ARCH_300)) 4938 kvm->arch.tlb_sets = POWER9_TLB_SETS_HASH; /* 256 */ 4939 else if (cpu_has_feature(CPU_FTR_ARCH_207S)) 4940 kvm->arch.tlb_sets = POWER8_TLB_SETS; /* 512 */ 4941 else 4942 kvm->arch.tlb_sets = POWER7_TLB_SETS; /* 128 */ 4943 4944 /* 4945 * Track that we now have a HV mode VM active. This blocks secondary 4946 * CPU threads from coming online. 4947 * On POWER9, we only need to do this if the "indep_threads_mode" 4948 * module parameter has been set to N. 4949 */ 4950 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 4951 if (!indep_threads_mode && !cpu_has_feature(CPU_FTR_HVMODE)) { 4952 pr_warn("KVM: Ignoring indep_threads_mode=N in nested hypervisor\n"); 4953 kvm->arch.threads_indep = true; 4954 } else { 4955 kvm->arch.threads_indep = indep_threads_mode; 4956 } 4957 } 4958 if (!kvm->arch.threads_indep) 4959 kvm_hv_vm_activated(); 4960 4961 /* 4962 * Initialize smt_mode depending on processor. 4963 * POWER8 and earlier have to use "strict" threading, where 4964 * all vCPUs in a vcore have to run on the same (sub)core, 4965 * whereas on POWER9 the threads can each run a different 4966 * guest. 4967 */ 4968 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 4969 kvm->arch.smt_mode = threads_per_subcore; 4970 else 4971 kvm->arch.smt_mode = 1; 4972 kvm->arch.emul_smt_mode = 1; 4973 4974 /* 4975 * Create a debugfs directory for the VM 4976 */ 4977 snprintf(buf, sizeof(buf), "vm%d", current->pid); 4978 kvm->arch.debugfs_dir = debugfs_create_dir(buf, kvm_debugfs_dir); 4979 kvmppc_mmu_debugfs_init(kvm); 4980 if (radix_enabled()) 4981 kvmhv_radix_debugfs_init(kvm); 4982 4983 return 0; 4984 } 4985 4986 static void kvmppc_free_vcores(struct kvm *kvm) 4987 { 4988 long int i; 4989 4990 for (i = 0; i < KVM_MAX_VCORES; ++i) 4991 kfree(kvm->arch.vcores[i]); 4992 kvm->arch.online_vcores = 0; 4993 } 4994 4995 static void kvmppc_core_destroy_vm_hv(struct kvm *kvm) 4996 { 4997 debugfs_remove_recursive(kvm->arch.debugfs_dir); 4998 4999 if (!kvm->arch.threads_indep) 5000 kvm_hv_vm_deactivated(); 5001 5002 kvmppc_free_vcores(kvm); 5003 5004 5005 if (kvm_is_radix(kvm)) 5006 kvmppc_free_radix(kvm); 5007 else 5008 kvmppc_free_hpt(&kvm->arch.hpt); 5009 5010 /* Perform global invalidation and return lpid to the pool */ 5011 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 5012 if (nesting_enabled(kvm)) 5013 kvmhv_release_all_nested(kvm); 5014 kvm->arch.process_table = 0; 5015 if (kvm->arch.secure_guest) 5016 uv_svm_terminate(kvm->arch.lpid); 5017 kvmhv_set_ptbl_entry(kvm->arch.lpid, 0, 0); 5018 } 5019 5020 kvmppc_free_lpid(kvm->arch.lpid); 5021 5022 kvmppc_free_pimap(kvm); 5023 } 5024 5025 /* We don't need to emulate any privileged instructions or dcbz */ 5026 static int kvmppc_core_emulate_op_hv(struct kvm_vcpu *vcpu, 5027 unsigned int inst, int *advance) 5028 { 5029 return EMULATE_FAIL; 5030 } 5031 5032 static int kvmppc_core_emulate_mtspr_hv(struct kvm_vcpu *vcpu, int sprn, 5033 ulong spr_val) 5034 { 5035 return EMULATE_FAIL; 5036 } 5037 5038 static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn, 5039 ulong *spr_val) 5040 { 5041 return EMULATE_FAIL; 5042 } 5043 5044 static int kvmppc_core_check_processor_compat_hv(void) 5045 { 5046 if (cpu_has_feature(CPU_FTR_HVMODE) && 5047 cpu_has_feature(CPU_FTR_ARCH_206)) 5048 return 0; 5049 5050 /* POWER9 in radix mode is capable of being a nested hypervisor. */ 5051 if (cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled()) 5052 return 0; 5053 5054 return -EIO; 5055 } 5056 5057 #ifdef CONFIG_KVM_XICS 5058 5059 void kvmppc_free_pimap(struct kvm *kvm) 5060 { 5061 kfree(kvm->arch.pimap); 5062 } 5063 5064 static struct kvmppc_passthru_irqmap *kvmppc_alloc_pimap(void) 5065 { 5066 return kzalloc(sizeof(struct kvmppc_passthru_irqmap), GFP_KERNEL); 5067 } 5068 5069 static int kvmppc_set_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi) 5070 { 5071 struct irq_desc *desc; 5072 struct kvmppc_irq_map *irq_map; 5073 struct kvmppc_passthru_irqmap *pimap; 5074 struct irq_chip *chip; 5075 int i, rc = 0; 5076 5077 if (!kvm_irq_bypass) 5078 return 1; 5079 5080 desc = irq_to_desc(host_irq); 5081 if (!desc) 5082 return -EIO; 5083 5084 mutex_lock(&kvm->lock); 5085 5086 pimap = kvm->arch.pimap; 5087 if (pimap == NULL) { 5088 /* First call, allocate structure to hold IRQ map */ 5089 pimap = kvmppc_alloc_pimap(); 5090 if (pimap == NULL) { 5091 mutex_unlock(&kvm->lock); 5092 return -ENOMEM; 5093 } 5094 kvm->arch.pimap = pimap; 5095 } 5096 5097 /* 5098 * For now, we only support interrupts for which the EOI operation 5099 * is an OPAL call followed by a write to XIRR, since that's 5100 * what our real-mode EOI code does, or a XIVE interrupt 5101 */ 5102 chip = irq_data_get_irq_chip(&desc->irq_data); 5103 if (!chip || !(is_pnv_opal_msi(chip) || is_xive_irq(chip))) { 5104 pr_warn("kvmppc_set_passthru_irq_hv: Could not assign IRQ map for (%d,%d)\n", 5105 host_irq, guest_gsi); 5106 mutex_unlock(&kvm->lock); 5107 return -ENOENT; 5108 } 5109 5110 /* 5111 * See if we already have an entry for this guest IRQ number. 5112 * If it's mapped to a hardware IRQ number, that's an error, 5113 * otherwise re-use this entry. 5114 */ 5115 for (i = 0; i < pimap->n_mapped; i++) { 5116 if (guest_gsi == pimap->mapped[i].v_hwirq) { 5117 if (pimap->mapped[i].r_hwirq) { 5118 mutex_unlock(&kvm->lock); 5119 return -EINVAL; 5120 } 5121 break; 5122 } 5123 } 5124 5125 if (i == KVMPPC_PIRQ_MAPPED) { 5126 mutex_unlock(&kvm->lock); 5127 return -EAGAIN; /* table is full */ 5128 } 5129 5130 irq_map = &pimap->mapped[i]; 5131 5132 irq_map->v_hwirq = guest_gsi; 5133 irq_map->desc = desc; 5134 5135 /* 5136 * Order the above two stores before the next to serialize with 5137 * the KVM real mode handler. 5138 */ 5139 smp_wmb(); 5140 irq_map->r_hwirq = desc->irq_data.hwirq; 5141 5142 if (i == pimap->n_mapped) 5143 pimap->n_mapped++; 5144 5145 if (xics_on_xive()) 5146 rc = kvmppc_xive_set_mapped(kvm, guest_gsi, desc); 5147 else 5148 kvmppc_xics_set_mapped(kvm, guest_gsi, desc->irq_data.hwirq); 5149 if (rc) 5150 irq_map->r_hwirq = 0; 5151 5152 mutex_unlock(&kvm->lock); 5153 5154 return 0; 5155 } 5156 5157 static int kvmppc_clr_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi) 5158 { 5159 struct irq_desc *desc; 5160 struct kvmppc_passthru_irqmap *pimap; 5161 int i, rc = 0; 5162 5163 if (!kvm_irq_bypass) 5164 return 0; 5165 5166 desc = irq_to_desc(host_irq); 5167 if (!desc) 5168 return -EIO; 5169 5170 mutex_lock(&kvm->lock); 5171 if (!kvm->arch.pimap) 5172 goto unlock; 5173 5174 pimap = kvm->arch.pimap; 5175 5176 for (i = 0; i < pimap->n_mapped; i++) { 5177 if (guest_gsi == pimap->mapped[i].v_hwirq) 5178 break; 5179 } 5180 5181 if (i == pimap->n_mapped) { 5182 mutex_unlock(&kvm->lock); 5183 return -ENODEV; 5184 } 5185 5186 if (xics_on_xive()) 5187 rc = kvmppc_xive_clr_mapped(kvm, guest_gsi, pimap->mapped[i].desc); 5188 else 5189 kvmppc_xics_clr_mapped(kvm, guest_gsi, pimap->mapped[i].r_hwirq); 5190 5191 /* invalidate the entry (what do do on error from the above ?) */ 5192 pimap->mapped[i].r_hwirq = 0; 5193 5194 /* 5195 * We don't free this structure even when the count goes to 5196 * zero. The structure is freed when we destroy the VM. 5197 */ 5198 unlock: 5199 mutex_unlock(&kvm->lock); 5200 return rc; 5201 } 5202 5203 static int kvmppc_irq_bypass_add_producer_hv(struct irq_bypass_consumer *cons, 5204 struct irq_bypass_producer *prod) 5205 { 5206 int ret = 0; 5207 struct kvm_kernel_irqfd *irqfd = 5208 container_of(cons, struct kvm_kernel_irqfd, consumer); 5209 5210 irqfd->producer = prod; 5211 5212 ret = kvmppc_set_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi); 5213 if (ret) 5214 pr_info("kvmppc_set_passthru_irq (irq %d, gsi %d) fails: %d\n", 5215 prod->irq, irqfd->gsi, ret); 5216 5217 return ret; 5218 } 5219 5220 static void kvmppc_irq_bypass_del_producer_hv(struct irq_bypass_consumer *cons, 5221 struct irq_bypass_producer *prod) 5222 { 5223 int ret; 5224 struct kvm_kernel_irqfd *irqfd = 5225 container_of(cons, struct kvm_kernel_irqfd, consumer); 5226 5227 irqfd->producer = NULL; 5228 5229 /* 5230 * When producer of consumer is unregistered, we change back to 5231 * default external interrupt handling mode - KVM real mode 5232 * will switch back to host. 5233 */ 5234 ret = kvmppc_clr_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi); 5235 if (ret) 5236 pr_warn("kvmppc_clr_passthru_irq (irq %d, gsi %d) fails: %d\n", 5237 prod->irq, irqfd->gsi, ret); 5238 } 5239 #endif 5240 5241 static long kvm_arch_vm_ioctl_hv(struct file *filp, 5242 unsigned int ioctl, unsigned long arg) 5243 { 5244 struct kvm *kvm __maybe_unused = filp->private_data; 5245 void __user *argp = (void __user *)arg; 5246 long r; 5247 5248 switch (ioctl) { 5249 5250 case KVM_PPC_ALLOCATE_HTAB: { 5251 u32 htab_order; 5252 5253 r = -EFAULT; 5254 if (get_user(htab_order, (u32 __user *)argp)) 5255 break; 5256 r = kvmppc_alloc_reset_hpt(kvm, htab_order); 5257 if (r) 5258 break; 5259 r = 0; 5260 break; 5261 } 5262 5263 case KVM_PPC_GET_HTAB_FD: { 5264 struct kvm_get_htab_fd ghf; 5265 5266 r = -EFAULT; 5267 if (copy_from_user(&ghf, argp, sizeof(ghf))) 5268 break; 5269 r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf); 5270 break; 5271 } 5272 5273 case KVM_PPC_RESIZE_HPT_PREPARE: { 5274 struct kvm_ppc_resize_hpt rhpt; 5275 5276 r = -EFAULT; 5277 if (copy_from_user(&rhpt, argp, sizeof(rhpt))) 5278 break; 5279 5280 r = kvm_vm_ioctl_resize_hpt_prepare(kvm, &rhpt); 5281 break; 5282 } 5283 5284 case KVM_PPC_RESIZE_HPT_COMMIT: { 5285 struct kvm_ppc_resize_hpt rhpt; 5286 5287 r = -EFAULT; 5288 if (copy_from_user(&rhpt, argp, sizeof(rhpt))) 5289 break; 5290 5291 r = kvm_vm_ioctl_resize_hpt_commit(kvm, &rhpt); 5292 break; 5293 } 5294 5295 default: 5296 r = -ENOTTY; 5297 } 5298 5299 return r; 5300 } 5301 5302 /* 5303 * List of hcall numbers to enable by default. 5304 * For compatibility with old userspace, we enable by default 5305 * all hcalls that were implemented before the hcall-enabling 5306 * facility was added. Note this list should not include H_RTAS. 5307 */ 5308 static unsigned int default_hcall_list[] = { 5309 H_REMOVE, 5310 H_ENTER, 5311 H_READ, 5312 H_PROTECT, 5313 H_BULK_REMOVE, 5314 H_GET_TCE, 5315 H_PUT_TCE, 5316 H_SET_DABR, 5317 H_SET_XDABR, 5318 H_CEDE, 5319 H_PROD, 5320 H_CONFER, 5321 H_REGISTER_VPA, 5322 #ifdef CONFIG_KVM_XICS 5323 H_EOI, 5324 H_CPPR, 5325 H_IPI, 5326 H_IPOLL, 5327 H_XIRR, 5328 H_XIRR_X, 5329 #endif 5330 0 5331 }; 5332 5333 static void init_default_hcalls(void) 5334 { 5335 int i; 5336 unsigned int hcall; 5337 5338 for (i = 0; default_hcall_list[i]; ++i) { 5339 hcall = default_hcall_list[i]; 5340 WARN_ON(!kvmppc_hcall_impl_hv(hcall)); 5341 __set_bit(hcall / 4, default_enabled_hcalls); 5342 } 5343 } 5344 5345 static int kvmhv_configure_mmu(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg) 5346 { 5347 unsigned long lpcr; 5348 int radix; 5349 int err; 5350 5351 /* If not on a POWER9, reject it */ 5352 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5353 return -ENODEV; 5354 5355 /* If any unknown flags set, reject it */ 5356 if (cfg->flags & ~(KVM_PPC_MMUV3_RADIX | KVM_PPC_MMUV3_GTSE)) 5357 return -EINVAL; 5358 5359 /* GR (guest radix) bit in process_table field must match */ 5360 radix = !!(cfg->flags & KVM_PPC_MMUV3_RADIX); 5361 if (!!(cfg->process_table & PATB_GR) != radix) 5362 return -EINVAL; 5363 5364 /* Process table size field must be reasonable, i.e. <= 24 */ 5365 if ((cfg->process_table & PRTS_MASK) > 24) 5366 return -EINVAL; 5367 5368 /* We can change a guest to/from radix now, if the host is radix */ 5369 if (radix && !radix_enabled()) 5370 return -EINVAL; 5371 5372 /* If we're a nested hypervisor, we currently only support radix */ 5373 if (kvmhv_on_pseries() && !radix) 5374 return -EINVAL; 5375 5376 mutex_lock(&kvm->arch.mmu_setup_lock); 5377 if (radix != kvm_is_radix(kvm)) { 5378 if (kvm->arch.mmu_ready) { 5379 kvm->arch.mmu_ready = 0; 5380 /* order mmu_ready vs. vcpus_running */ 5381 smp_mb(); 5382 if (atomic_read(&kvm->arch.vcpus_running)) { 5383 kvm->arch.mmu_ready = 1; 5384 err = -EBUSY; 5385 goto out_unlock; 5386 } 5387 } 5388 if (radix) 5389 err = kvmppc_switch_mmu_to_radix(kvm); 5390 else 5391 err = kvmppc_switch_mmu_to_hpt(kvm); 5392 if (err) 5393 goto out_unlock; 5394 } 5395 5396 kvm->arch.process_table = cfg->process_table; 5397 kvmppc_setup_partition_table(kvm); 5398 5399 lpcr = (cfg->flags & KVM_PPC_MMUV3_GTSE) ? LPCR_GTSE : 0; 5400 kvmppc_update_lpcr(kvm, lpcr, LPCR_GTSE); 5401 err = 0; 5402 5403 out_unlock: 5404 mutex_unlock(&kvm->arch.mmu_setup_lock); 5405 return err; 5406 } 5407 5408 static int kvmhv_enable_nested(struct kvm *kvm) 5409 { 5410 if (!nested) 5411 return -EPERM; 5412 if (!cpu_has_feature(CPU_FTR_ARCH_300) || no_mixing_hpt_and_radix) 5413 return -ENODEV; 5414 5415 /* kvm == NULL means the caller is testing if the capability exists */ 5416 if (kvm) 5417 kvm->arch.nested_enable = true; 5418 return 0; 5419 } 5420 5421 static int kvmhv_load_from_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr, 5422 int size) 5423 { 5424 int rc = -EINVAL; 5425 5426 if (kvmhv_vcpu_is_radix(vcpu)) { 5427 rc = kvmhv_copy_from_guest_radix(vcpu, *eaddr, ptr, size); 5428 5429 if (rc > 0) 5430 rc = -EINVAL; 5431 } 5432 5433 /* For now quadrants are the only way to access nested guest memory */ 5434 if (rc && vcpu->arch.nested) 5435 rc = -EAGAIN; 5436 5437 return rc; 5438 } 5439 5440 static int kvmhv_store_to_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr, 5441 int size) 5442 { 5443 int rc = -EINVAL; 5444 5445 if (kvmhv_vcpu_is_radix(vcpu)) { 5446 rc = kvmhv_copy_to_guest_radix(vcpu, *eaddr, ptr, size); 5447 5448 if (rc > 0) 5449 rc = -EINVAL; 5450 } 5451 5452 /* For now quadrants are the only way to access nested guest memory */ 5453 if (rc && vcpu->arch.nested) 5454 rc = -EAGAIN; 5455 5456 return rc; 5457 } 5458 5459 static void unpin_vpa_reset(struct kvm *kvm, struct kvmppc_vpa *vpa) 5460 { 5461 unpin_vpa(kvm, vpa); 5462 vpa->gpa = 0; 5463 vpa->pinned_addr = NULL; 5464 vpa->dirty = false; 5465 vpa->update_pending = 0; 5466 } 5467 5468 /* 5469 * Enable a guest to become a secure VM, or test whether 5470 * that could be enabled. 5471 * Called when the KVM_CAP_PPC_SECURE_GUEST capability is 5472 * tested (kvm == NULL) or enabled (kvm != NULL). 5473 */ 5474 static int kvmhv_enable_svm(struct kvm *kvm) 5475 { 5476 if (!kvmppc_uvmem_available()) 5477 return -EINVAL; 5478 if (kvm) 5479 kvm->arch.svm_enabled = 1; 5480 return 0; 5481 } 5482 5483 /* 5484 * IOCTL handler to turn off secure mode of guest 5485 * 5486 * - Release all device pages 5487 * - Issue ucall to terminate the guest on the UV side 5488 * - Unpin the VPA pages. 5489 * - Reinit the partition scoped page tables 5490 */ 5491 static int kvmhv_svm_off(struct kvm *kvm) 5492 { 5493 struct kvm_vcpu *vcpu; 5494 int mmu_was_ready; 5495 int srcu_idx; 5496 int ret = 0; 5497 int i; 5498 5499 if (!(kvm->arch.secure_guest & KVMPPC_SECURE_INIT_START)) 5500 return ret; 5501 5502 mutex_lock(&kvm->arch.mmu_setup_lock); 5503 mmu_was_ready = kvm->arch.mmu_ready; 5504 if (kvm->arch.mmu_ready) { 5505 kvm->arch.mmu_ready = 0; 5506 /* order mmu_ready vs. vcpus_running */ 5507 smp_mb(); 5508 if (atomic_read(&kvm->arch.vcpus_running)) { 5509 kvm->arch.mmu_ready = 1; 5510 ret = -EBUSY; 5511 goto out; 5512 } 5513 } 5514 5515 srcu_idx = srcu_read_lock(&kvm->srcu); 5516 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { 5517 struct kvm_memory_slot *memslot; 5518 struct kvm_memslots *slots = __kvm_memslots(kvm, i); 5519 5520 if (!slots) 5521 continue; 5522 5523 kvm_for_each_memslot(memslot, slots) { 5524 kvmppc_uvmem_drop_pages(memslot, kvm, true); 5525 uv_unregister_mem_slot(kvm->arch.lpid, memslot->id); 5526 } 5527 } 5528 srcu_read_unlock(&kvm->srcu, srcu_idx); 5529 5530 ret = uv_svm_terminate(kvm->arch.lpid); 5531 if (ret != U_SUCCESS) { 5532 ret = -EINVAL; 5533 goto out; 5534 } 5535 5536 /* 5537 * When secure guest is reset, all the guest pages are sent 5538 * to UV via UV_PAGE_IN before the non-boot vcpus get a 5539 * chance to run and unpin their VPA pages. Unpinning of all 5540 * VPA pages is done here explicitly so that VPA pages 5541 * can be migrated to the secure side. 5542 * 5543 * This is required to for the secure SMP guest to reboot 5544 * correctly. 5545 */ 5546 kvm_for_each_vcpu(i, vcpu, kvm) { 5547 spin_lock(&vcpu->arch.vpa_update_lock); 5548 unpin_vpa_reset(kvm, &vcpu->arch.dtl); 5549 unpin_vpa_reset(kvm, &vcpu->arch.slb_shadow); 5550 unpin_vpa_reset(kvm, &vcpu->arch.vpa); 5551 spin_unlock(&vcpu->arch.vpa_update_lock); 5552 } 5553 5554 kvmppc_setup_partition_table(kvm); 5555 kvm->arch.secure_guest = 0; 5556 kvm->arch.mmu_ready = mmu_was_ready; 5557 out: 5558 mutex_unlock(&kvm->arch.mmu_setup_lock); 5559 return ret; 5560 } 5561 5562 static struct kvmppc_ops kvm_ops_hv = { 5563 .get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv, 5564 .set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv, 5565 .get_one_reg = kvmppc_get_one_reg_hv, 5566 .set_one_reg = kvmppc_set_one_reg_hv, 5567 .vcpu_load = kvmppc_core_vcpu_load_hv, 5568 .vcpu_put = kvmppc_core_vcpu_put_hv, 5569 .inject_interrupt = kvmppc_inject_interrupt_hv, 5570 .set_msr = kvmppc_set_msr_hv, 5571 .vcpu_run = kvmppc_vcpu_run_hv, 5572 .vcpu_create = kvmppc_core_vcpu_create_hv, 5573 .vcpu_free = kvmppc_core_vcpu_free_hv, 5574 .check_requests = kvmppc_core_check_requests_hv, 5575 .get_dirty_log = kvm_vm_ioctl_get_dirty_log_hv, 5576 .flush_memslot = kvmppc_core_flush_memslot_hv, 5577 .prepare_memory_region = kvmppc_core_prepare_memory_region_hv, 5578 .commit_memory_region = kvmppc_core_commit_memory_region_hv, 5579 .unmap_hva_range = kvm_unmap_hva_range_hv, 5580 .age_hva = kvm_age_hva_hv, 5581 .test_age_hva = kvm_test_age_hva_hv, 5582 .set_spte_hva = kvm_set_spte_hva_hv, 5583 .free_memslot = kvmppc_core_free_memslot_hv, 5584 .init_vm = kvmppc_core_init_vm_hv, 5585 .destroy_vm = kvmppc_core_destroy_vm_hv, 5586 .get_smmu_info = kvm_vm_ioctl_get_smmu_info_hv, 5587 .emulate_op = kvmppc_core_emulate_op_hv, 5588 .emulate_mtspr = kvmppc_core_emulate_mtspr_hv, 5589 .emulate_mfspr = kvmppc_core_emulate_mfspr_hv, 5590 .fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv, 5591 .arch_vm_ioctl = kvm_arch_vm_ioctl_hv, 5592 .hcall_implemented = kvmppc_hcall_impl_hv, 5593 #ifdef CONFIG_KVM_XICS 5594 .irq_bypass_add_producer = kvmppc_irq_bypass_add_producer_hv, 5595 .irq_bypass_del_producer = kvmppc_irq_bypass_del_producer_hv, 5596 #endif 5597 .configure_mmu = kvmhv_configure_mmu, 5598 .get_rmmu_info = kvmhv_get_rmmu_info, 5599 .set_smt_mode = kvmhv_set_smt_mode, 5600 .enable_nested = kvmhv_enable_nested, 5601 .load_from_eaddr = kvmhv_load_from_eaddr, 5602 .store_to_eaddr = kvmhv_store_to_eaddr, 5603 .enable_svm = kvmhv_enable_svm, 5604 .svm_off = kvmhv_svm_off, 5605 }; 5606 5607 static int kvm_init_subcore_bitmap(void) 5608 { 5609 int i, j; 5610 int nr_cores = cpu_nr_cores(); 5611 struct sibling_subcore_state *sibling_subcore_state; 5612 5613 for (i = 0; i < nr_cores; i++) { 5614 int first_cpu = i * threads_per_core; 5615 int node = cpu_to_node(first_cpu); 5616 5617 /* Ignore if it is already allocated. */ 5618 if (paca_ptrs[first_cpu]->sibling_subcore_state) 5619 continue; 5620 5621 sibling_subcore_state = 5622 kzalloc_node(sizeof(struct sibling_subcore_state), 5623 GFP_KERNEL, node); 5624 if (!sibling_subcore_state) 5625 return -ENOMEM; 5626 5627 5628 for (j = 0; j < threads_per_core; j++) { 5629 int cpu = first_cpu + j; 5630 5631 paca_ptrs[cpu]->sibling_subcore_state = 5632 sibling_subcore_state; 5633 } 5634 } 5635 return 0; 5636 } 5637 5638 static int kvmppc_radix_possible(void) 5639 { 5640 return cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled(); 5641 } 5642 5643 static int kvmppc_book3s_init_hv(void) 5644 { 5645 int r; 5646 5647 if (!tlbie_capable) { 5648 pr_err("KVM-HV: Host does not support TLBIE\n"); 5649 return -ENODEV; 5650 } 5651 5652 /* 5653 * FIXME!! Do we need to check on all cpus ? 5654 */ 5655 r = kvmppc_core_check_processor_compat_hv(); 5656 if (r < 0) 5657 return -ENODEV; 5658 5659 r = kvmhv_nested_init(); 5660 if (r) 5661 return r; 5662 5663 r = kvm_init_subcore_bitmap(); 5664 if (r) 5665 return r; 5666 5667 /* 5668 * We need a way of accessing the XICS interrupt controller, 5669 * either directly, via paca_ptrs[cpu]->kvm_hstate.xics_phys, or 5670 * indirectly, via OPAL. 5671 */ 5672 #ifdef CONFIG_SMP 5673 if (!xics_on_xive() && !kvmhv_on_pseries() && 5674 !local_paca->kvm_hstate.xics_phys) { 5675 struct device_node *np; 5676 5677 np = of_find_compatible_node(NULL, NULL, "ibm,opal-intc"); 5678 if (!np) { 5679 pr_err("KVM-HV: Cannot determine method for accessing XICS\n"); 5680 return -ENODEV; 5681 } 5682 /* presence of intc confirmed - node can be dropped again */ 5683 of_node_put(np); 5684 } 5685 #endif 5686 5687 kvm_ops_hv.owner = THIS_MODULE; 5688 kvmppc_hv_ops = &kvm_ops_hv; 5689 5690 init_default_hcalls(); 5691 5692 init_vcore_lists(); 5693 5694 r = kvmppc_mmu_hv_init(); 5695 if (r) 5696 return r; 5697 5698 if (kvmppc_radix_possible()) 5699 r = kvmppc_radix_init(); 5700 5701 /* 5702 * POWER9 chips before version 2.02 can't have some threads in 5703 * HPT mode and some in radix mode on the same core. 5704 */ 5705 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 5706 unsigned int pvr = mfspr(SPRN_PVR); 5707 if ((pvr >> 16) == PVR_POWER9 && 5708 (((pvr & 0xe000) == 0 && (pvr & 0xfff) < 0x202) || 5709 ((pvr & 0xe000) == 0x2000 && (pvr & 0xfff) < 0x101))) 5710 no_mixing_hpt_and_radix = true; 5711 } 5712 5713 r = kvmppc_uvmem_init(); 5714 if (r < 0) 5715 pr_err("KVM-HV: kvmppc_uvmem_init failed %d\n", r); 5716 5717 return r; 5718 } 5719 5720 static void kvmppc_book3s_exit_hv(void) 5721 { 5722 kvmppc_uvmem_free(); 5723 kvmppc_free_host_rm_ops(); 5724 if (kvmppc_radix_possible()) 5725 kvmppc_radix_exit(); 5726 kvmppc_hv_ops = NULL; 5727 kvmhv_nested_exit(); 5728 } 5729 5730 module_init(kvmppc_book3s_init_hv); 5731 module_exit(kvmppc_book3s_exit_hv); 5732 MODULE_LICENSE("GPL"); 5733 MODULE_ALIAS_MISCDEV(KVM_MINOR); 5734 MODULE_ALIAS("devname:kvm"); 5735