1 /* 2 * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> 3 * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved. 4 * 5 * Authors: 6 * Paul Mackerras <paulus@au1.ibm.com> 7 * Alexander Graf <agraf@suse.de> 8 * Kevin Wolf <mail@kevin-wolf.de> 9 * 10 * Description: KVM functions specific to running on Book 3S 11 * processors in hypervisor mode (specifically POWER7 and later). 12 * 13 * This file is derived from arch/powerpc/kvm/book3s.c, 14 * by Alexander Graf <agraf@suse.de>. 15 * 16 * This program is free software; you can redistribute it and/or modify 17 * it under the terms of the GNU General Public License, version 2, as 18 * published by the Free Software Foundation. 19 */ 20 21 #include <linux/kvm_host.h> 22 #include <linux/err.h> 23 #include <linux/slab.h> 24 #include <linux/preempt.h> 25 #include <linux/sched.h> 26 #include <linux/delay.h> 27 #include <linux/export.h> 28 #include <linux/fs.h> 29 #include <linux/anon_inodes.h> 30 #include <linux/cpu.h> 31 #include <linux/cpumask.h> 32 #include <linux/spinlock.h> 33 #include <linux/page-flags.h> 34 #include <linux/srcu.h> 35 #include <linux/miscdevice.h> 36 #include <linux/debugfs.h> 37 38 #include <asm/reg.h> 39 #include <asm/cputable.h> 40 #include <asm/cacheflush.h> 41 #include <asm/tlbflush.h> 42 #include <asm/uaccess.h> 43 #include <asm/io.h> 44 #include <asm/kvm_ppc.h> 45 #include <asm/kvm_book3s.h> 46 #include <asm/mmu_context.h> 47 #include <asm/lppaca.h> 48 #include <asm/processor.h> 49 #include <asm/cputhreads.h> 50 #include <asm/page.h> 51 #include <asm/hvcall.h> 52 #include <asm/switch_to.h> 53 #include <asm/smp.h> 54 #include <asm/dbell.h> 55 #include <asm/hmi.h> 56 #include <asm/pnv-pci.h> 57 #include <linux/gfp.h> 58 #include <linux/vmalloc.h> 59 #include <linux/highmem.h> 60 #include <linux/hugetlb.h> 61 #include <linux/kvm_irqfd.h> 62 #include <linux/irqbypass.h> 63 #include <linux/module.h> 64 #include <linux/compiler.h> 65 66 #include "book3s.h" 67 68 #define CREATE_TRACE_POINTS 69 #include "trace_hv.h" 70 71 /* #define EXIT_DEBUG */ 72 /* #define EXIT_DEBUG_SIMPLE */ 73 /* #define EXIT_DEBUG_INT */ 74 75 /* Used to indicate that a guest page fault needs to be handled */ 76 #define RESUME_PAGE_FAULT (RESUME_GUEST | RESUME_FLAG_ARCH1) 77 /* Used to indicate that a guest passthrough interrupt needs to be handled */ 78 #define RESUME_PASSTHROUGH (RESUME_GUEST | RESUME_FLAG_ARCH2) 79 80 /* Used as a "null" value for timebase values */ 81 #define TB_NIL (~(u64)0) 82 83 static DECLARE_BITMAP(default_enabled_hcalls, MAX_HCALL_OPCODE/4 + 1); 84 85 static int dynamic_mt_modes = 6; 86 module_param(dynamic_mt_modes, int, S_IRUGO | S_IWUSR); 87 MODULE_PARM_DESC(dynamic_mt_modes, "Set of allowed dynamic micro-threading modes: 0 (= none), 2, 4, or 6 (= 2 or 4)"); 88 static int target_smt_mode; 89 module_param(target_smt_mode, int, S_IRUGO | S_IWUSR); 90 MODULE_PARM_DESC(target_smt_mode, "Target threads per core (0 = max)"); 91 92 #ifdef CONFIG_KVM_XICS 93 static struct kernel_param_ops module_param_ops = { 94 .set = param_set_int, 95 .get = param_get_int, 96 }; 97 98 module_param_cb(kvm_irq_bypass, &module_param_ops, &kvm_irq_bypass, 99 S_IRUGO | S_IWUSR); 100 MODULE_PARM_DESC(kvm_irq_bypass, "Bypass passthrough interrupt optimization"); 101 102 module_param_cb(h_ipi_redirect, &module_param_ops, &h_ipi_redirect, 103 S_IRUGO | S_IWUSR); 104 MODULE_PARM_DESC(h_ipi_redirect, "Redirect H_IPI wakeup to a free host core"); 105 #endif 106 107 /* Maximum halt poll interval defaults to KVM_HALT_POLL_NS_DEFAULT */ 108 static unsigned int halt_poll_max_ns = KVM_HALT_POLL_NS_DEFAULT; 109 module_param(halt_poll_max_ns, uint, S_IRUGO | S_IWUSR); 110 MODULE_PARM_DESC(halt_poll_max_ns, "Maximum halt poll time in ns"); 111 112 /* Factor by which the vcore halt poll interval is grown, default is to double 113 */ 114 static unsigned int halt_poll_ns_grow = 2; 115 module_param(halt_poll_ns_grow, int, S_IRUGO); 116 MODULE_PARM_DESC(halt_poll_ns_grow, "Factor halt poll time is grown by"); 117 118 /* Factor by which the vcore halt poll interval is shrunk, default is to reset 119 */ 120 static unsigned int halt_poll_ns_shrink; 121 module_param(halt_poll_ns_shrink, int, S_IRUGO); 122 MODULE_PARM_DESC(halt_poll_ns_shrink, "Factor halt poll time is shrunk by"); 123 124 static void kvmppc_end_cede(struct kvm_vcpu *vcpu); 125 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu); 126 127 static inline struct kvm_vcpu *next_runnable_thread(struct kvmppc_vcore *vc, 128 int *ip) 129 { 130 int i = *ip; 131 struct kvm_vcpu *vcpu; 132 133 while (++i < MAX_SMT_THREADS) { 134 vcpu = READ_ONCE(vc->runnable_threads[i]); 135 if (vcpu) { 136 *ip = i; 137 return vcpu; 138 } 139 } 140 return NULL; 141 } 142 143 /* Used to traverse the list of runnable threads for a given vcore */ 144 #define for_each_runnable_thread(i, vcpu, vc) \ 145 for (i = -1; (vcpu = next_runnable_thread(vc, &i)); ) 146 147 static bool kvmppc_ipi_thread(int cpu) 148 { 149 /* On POWER8 for IPIs to threads in the same core, use msgsnd */ 150 if (cpu_has_feature(CPU_FTR_ARCH_207S)) { 151 preempt_disable(); 152 if (cpu_first_thread_sibling(cpu) == 153 cpu_first_thread_sibling(smp_processor_id())) { 154 unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER); 155 msg |= cpu_thread_in_core(cpu); 156 smp_mb(); 157 __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg)); 158 preempt_enable(); 159 return true; 160 } 161 preempt_enable(); 162 } 163 164 #if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP) 165 if (cpu >= 0 && cpu < nr_cpu_ids && paca[cpu].kvm_hstate.xics_phys) { 166 xics_wake_cpu(cpu); 167 return true; 168 } 169 #endif 170 171 return false; 172 } 173 174 static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu) 175 { 176 int cpu; 177 struct swait_queue_head *wqp; 178 179 wqp = kvm_arch_vcpu_wq(vcpu); 180 if (swait_active(wqp)) { 181 swake_up(wqp); 182 ++vcpu->stat.halt_wakeup; 183 } 184 185 if (kvmppc_ipi_thread(vcpu->arch.thread_cpu)) 186 return; 187 188 /* CPU points to the first thread of the core */ 189 cpu = vcpu->cpu; 190 if (cpu >= 0 && cpu < nr_cpu_ids && cpu_online(cpu)) 191 smp_send_reschedule(cpu); 192 } 193 194 /* 195 * We use the vcpu_load/put functions to measure stolen time. 196 * Stolen time is counted as time when either the vcpu is able to 197 * run as part of a virtual core, but the task running the vcore 198 * is preempted or sleeping, or when the vcpu needs something done 199 * in the kernel by the task running the vcpu, but that task is 200 * preempted or sleeping. Those two things have to be counted 201 * separately, since one of the vcpu tasks will take on the job 202 * of running the core, and the other vcpu tasks in the vcore will 203 * sleep waiting for it to do that, but that sleep shouldn't count 204 * as stolen time. 205 * 206 * Hence we accumulate stolen time when the vcpu can run as part of 207 * a vcore using vc->stolen_tb, and the stolen time when the vcpu 208 * needs its task to do other things in the kernel (for example, 209 * service a page fault) in busy_stolen. We don't accumulate 210 * stolen time for a vcore when it is inactive, or for a vcpu 211 * when it is in state RUNNING or NOTREADY. NOTREADY is a bit of 212 * a misnomer; it means that the vcpu task is not executing in 213 * the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in 214 * the kernel. We don't have any way of dividing up that time 215 * between time that the vcpu is genuinely stopped, time that 216 * the task is actively working on behalf of the vcpu, and time 217 * that the task is preempted, so we don't count any of it as 218 * stolen. 219 * 220 * Updates to busy_stolen are protected by arch.tbacct_lock; 221 * updates to vc->stolen_tb are protected by the vcore->stoltb_lock 222 * lock. The stolen times are measured in units of timebase ticks. 223 * (Note that the != TB_NIL checks below are purely defensive; 224 * they should never fail.) 225 */ 226 227 static void kvmppc_core_start_stolen(struct kvmppc_vcore *vc) 228 { 229 unsigned long flags; 230 231 spin_lock_irqsave(&vc->stoltb_lock, flags); 232 vc->preempt_tb = mftb(); 233 spin_unlock_irqrestore(&vc->stoltb_lock, flags); 234 } 235 236 static void kvmppc_core_end_stolen(struct kvmppc_vcore *vc) 237 { 238 unsigned long flags; 239 240 spin_lock_irqsave(&vc->stoltb_lock, flags); 241 if (vc->preempt_tb != TB_NIL) { 242 vc->stolen_tb += mftb() - vc->preempt_tb; 243 vc->preempt_tb = TB_NIL; 244 } 245 spin_unlock_irqrestore(&vc->stoltb_lock, flags); 246 } 247 248 static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu) 249 { 250 struct kvmppc_vcore *vc = vcpu->arch.vcore; 251 unsigned long flags; 252 253 /* 254 * We can test vc->runner without taking the vcore lock, 255 * because only this task ever sets vc->runner to this 256 * vcpu, and once it is set to this vcpu, only this task 257 * ever sets it to NULL. 258 */ 259 if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING) 260 kvmppc_core_end_stolen(vc); 261 262 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); 263 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST && 264 vcpu->arch.busy_preempt != TB_NIL) { 265 vcpu->arch.busy_stolen += mftb() - vcpu->arch.busy_preempt; 266 vcpu->arch.busy_preempt = TB_NIL; 267 } 268 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); 269 } 270 271 static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu) 272 { 273 struct kvmppc_vcore *vc = vcpu->arch.vcore; 274 unsigned long flags; 275 276 if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING) 277 kvmppc_core_start_stolen(vc); 278 279 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); 280 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST) 281 vcpu->arch.busy_preempt = mftb(); 282 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); 283 } 284 285 static void kvmppc_set_msr_hv(struct kvm_vcpu *vcpu, u64 msr) 286 { 287 /* 288 * Check for illegal transactional state bit combination 289 * and if we find it, force the TS field to a safe state. 290 */ 291 if ((msr & MSR_TS_MASK) == MSR_TS_MASK) 292 msr &= ~MSR_TS_MASK; 293 vcpu->arch.shregs.msr = msr; 294 kvmppc_end_cede(vcpu); 295 } 296 297 static void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr) 298 { 299 vcpu->arch.pvr = pvr; 300 } 301 302 static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat) 303 { 304 unsigned long pcr = 0; 305 struct kvmppc_vcore *vc = vcpu->arch.vcore; 306 307 if (arch_compat) { 308 switch (arch_compat) { 309 case PVR_ARCH_205: 310 /* 311 * If an arch bit is set in PCR, all the defined 312 * higher-order arch bits also have to be set. 313 */ 314 pcr = PCR_ARCH_206 | PCR_ARCH_205; 315 break; 316 case PVR_ARCH_206: 317 case PVR_ARCH_206p: 318 pcr = PCR_ARCH_206; 319 break; 320 case PVR_ARCH_207: 321 break; 322 default: 323 return -EINVAL; 324 } 325 326 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) { 327 /* POWER7 can't emulate POWER8 */ 328 if (!(pcr & PCR_ARCH_206)) 329 return -EINVAL; 330 pcr &= ~PCR_ARCH_206; 331 } 332 } 333 334 spin_lock(&vc->lock); 335 vc->arch_compat = arch_compat; 336 vc->pcr = pcr; 337 spin_unlock(&vc->lock); 338 339 return 0; 340 } 341 342 static void kvmppc_dump_regs(struct kvm_vcpu *vcpu) 343 { 344 int r; 345 346 pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id); 347 pr_err("pc = %.16lx msr = %.16llx trap = %x\n", 348 vcpu->arch.pc, vcpu->arch.shregs.msr, vcpu->arch.trap); 349 for (r = 0; r < 16; ++r) 350 pr_err("r%2d = %.16lx r%d = %.16lx\n", 351 r, kvmppc_get_gpr(vcpu, r), 352 r+16, kvmppc_get_gpr(vcpu, r+16)); 353 pr_err("ctr = %.16lx lr = %.16lx\n", 354 vcpu->arch.ctr, vcpu->arch.lr); 355 pr_err("srr0 = %.16llx srr1 = %.16llx\n", 356 vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1); 357 pr_err("sprg0 = %.16llx sprg1 = %.16llx\n", 358 vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1); 359 pr_err("sprg2 = %.16llx sprg3 = %.16llx\n", 360 vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3); 361 pr_err("cr = %.8x xer = %.16lx dsisr = %.8x\n", 362 vcpu->arch.cr, vcpu->arch.xer, vcpu->arch.shregs.dsisr); 363 pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar); 364 pr_err("fault dar = %.16lx dsisr = %.8x\n", 365 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); 366 pr_err("SLB (%d entries):\n", vcpu->arch.slb_max); 367 for (r = 0; r < vcpu->arch.slb_max; ++r) 368 pr_err(" ESID = %.16llx VSID = %.16llx\n", 369 vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv); 370 pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n", 371 vcpu->arch.vcore->lpcr, vcpu->kvm->arch.sdr1, 372 vcpu->arch.last_inst); 373 } 374 375 static struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id) 376 { 377 struct kvm_vcpu *ret; 378 379 mutex_lock(&kvm->lock); 380 ret = kvm_get_vcpu_by_id(kvm, id); 381 mutex_unlock(&kvm->lock); 382 return ret; 383 } 384 385 static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa) 386 { 387 vpa->__old_status |= LPPACA_OLD_SHARED_PROC; 388 vpa->yield_count = cpu_to_be32(1); 389 } 390 391 static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v, 392 unsigned long addr, unsigned long len) 393 { 394 /* check address is cacheline aligned */ 395 if (addr & (L1_CACHE_BYTES - 1)) 396 return -EINVAL; 397 spin_lock(&vcpu->arch.vpa_update_lock); 398 if (v->next_gpa != addr || v->len != len) { 399 v->next_gpa = addr; 400 v->len = addr ? len : 0; 401 v->update_pending = 1; 402 } 403 spin_unlock(&vcpu->arch.vpa_update_lock); 404 return 0; 405 } 406 407 /* Length for a per-processor buffer is passed in at offset 4 in the buffer */ 408 struct reg_vpa { 409 u32 dummy; 410 union { 411 __be16 hword; 412 __be32 word; 413 } length; 414 }; 415 416 static int vpa_is_registered(struct kvmppc_vpa *vpap) 417 { 418 if (vpap->update_pending) 419 return vpap->next_gpa != 0; 420 return vpap->pinned_addr != NULL; 421 } 422 423 static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu, 424 unsigned long flags, 425 unsigned long vcpuid, unsigned long vpa) 426 { 427 struct kvm *kvm = vcpu->kvm; 428 unsigned long len, nb; 429 void *va; 430 struct kvm_vcpu *tvcpu; 431 int err; 432 int subfunc; 433 struct kvmppc_vpa *vpap; 434 435 tvcpu = kvmppc_find_vcpu(kvm, vcpuid); 436 if (!tvcpu) 437 return H_PARAMETER; 438 439 subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK; 440 if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL || 441 subfunc == H_VPA_REG_SLB) { 442 /* Registering new area - address must be cache-line aligned */ 443 if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa) 444 return H_PARAMETER; 445 446 /* convert logical addr to kernel addr and read length */ 447 va = kvmppc_pin_guest_page(kvm, vpa, &nb); 448 if (va == NULL) 449 return H_PARAMETER; 450 if (subfunc == H_VPA_REG_VPA) 451 len = be16_to_cpu(((struct reg_vpa *)va)->length.hword); 452 else 453 len = be32_to_cpu(((struct reg_vpa *)va)->length.word); 454 kvmppc_unpin_guest_page(kvm, va, vpa, false); 455 456 /* Check length */ 457 if (len > nb || len < sizeof(struct reg_vpa)) 458 return H_PARAMETER; 459 } else { 460 vpa = 0; 461 len = 0; 462 } 463 464 err = H_PARAMETER; 465 vpap = NULL; 466 spin_lock(&tvcpu->arch.vpa_update_lock); 467 468 switch (subfunc) { 469 case H_VPA_REG_VPA: /* register VPA */ 470 if (len < sizeof(struct lppaca)) 471 break; 472 vpap = &tvcpu->arch.vpa; 473 err = 0; 474 break; 475 476 case H_VPA_REG_DTL: /* register DTL */ 477 if (len < sizeof(struct dtl_entry)) 478 break; 479 len -= len % sizeof(struct dtl_entry); 480 481 /* Check that they have previously registered a VPA */ 482 err = H_RESOURCE; 483 if (!vpa_is_registered(&tvcpu->arch.vpa)) 484 break; 485 486 vpap = &tvcpu->arch.dtl; 487 err = 0; 488 break; 489 490 case H_VPA_REG_SLB: /* register SLB shadow buffer */ 491 /* Check that they have previously registered a VPA */ 492 err = H_RESOURCE; 493 if (!vpa_is_registered(&tvcpu->arch.vpa)) 494 break; 495 496 vpap = &tvcpu->arch.slb_shadow; 497 err = 0; 498 break; 499 500 case H_VPA_DEREG_VPA: /* deregister VPA */ 501 /* Check they don't still have a DTL or SLB buf registered */ 502 err = H_RESOURCE; 503 if (vpa_is_registered(&tvcpu->arch.dtl) || 504 vpa_is_registered(&tvcpu->arch.slb_shadow)) 505 break; 506 507 vpap = &tvcpu->arch.vpa; 508 err = 0; 509 break; 510 511 case H_VPA_DEREG_DTL: /* deregister DTL */ 512 vpap = &tvcpu->arch.dtl; 513 err = 0; 514 break; 515 516 case H_VPA_DEREG_SLB: /* deregister SLB shadow buffer */ 517 vpap = &tvcpu->arch.slb_shadow; 518 err = 0; 519 break; 520 } 521 522 if (vpap) { 523 vpap->next_gpa = vpa; 524 vpap->len = len; 525 vpap->update_pending = 1; 526 } 527 528 spin_unlock(&tvcpu->arch.vpa_update_lock); 529 530 return err; 531 } 532 533 static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap) 534 { 535 struct kvm *kvm = vcpu->kvm; 536 void *va; 537 unsigned long nb; 538 unsigned long gpa; 539 540 /* 541 * We need to pin the page pointed to by vpap->next_gpa, 542 * but we can't call kvmppc_pin_guest_page under the lock 543 * as it does get_user_pages() and down_read(). So we 544 * have to drop the lock, pin the page, then get the lock 545 * again and check that a new area didn't get registered 546 * in the meantime. 547 */ 548 for (;;) { 549 gpa = vpap->next_gpa; 550 spin_unlock(&vcpu->arch.vpa_update_lock); 551 va = NULL; 552 nb = 0; 553 if (gpa) 554 va = kvmppc_pin_guest_page(kvm, gpa, &nb); 555 spin_lock(&vcpu->arch.vpa_update_lock); 556 if (gpa == vpap->next_gpa) 557 break; 558 /* sigh... unpin that one and try again */ 559 if (va) 560 kvmppc_unpin_guest_page(kvm, va, gpa, false); 561 } 562 563 vpap->update_pending = 0; 564 if (va && nb < vpap->len) { 565 /* 566 * If it's now too short, it must be that userspace 567 * has changed the mappings underlying guest memory, 568 * so unregister the region. 569 */ 570 kvmppc_unpin_guest_page(kvm, va, gpa, false); 571 va = NULL; 572 } 573 if (vpap->pinned_addr) 574 kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa, 575 vpap->dirty); 576 vpap->gpa = gpa; 577 vpap->pinned_addr = va; 578 vpap->dirty = false; 579 if (va) 580 vpap->pinned_end = va + vpap->len; 581 } 582 583 static void kvmppc_update_vpas(struct kvm_vcpu *vcpu) 584 { 585 if (!(vcpu->arch.vpa.update_pending || 586 vcpu->arch.slb_shadow.update_pending || 587 vcpu->arch.dtl.update_pending)) 588 return; 589 590 spin_lock(&vcpu->arch.vpa_update_lock); 591 if (vcpu->arch.vpa.update_pending) { 592 kvmppc_update_vpa(vcpu, &vcpu->arch.vpa); 593 if (vcpu->arch.vpa.pinned_addr) 594 init_vpa(vcpu, vcpu->arch.vpa.pinned_addr); 595 } 596 if (vcpu->arch.dtl.update_pending) { 597 kvmppc_update_vpa(vcpu, &vcpu->arch.dtl); 598 vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr; 599 vcpu->arch.dtl_index = 0; 600 } 601 if (vcpu->arch.slb_shadow.update_pending) 602 kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow); 603 spin_unlock(&vcpu->arch.vpa_update_lock); 604 } 605 606 /* 607 * Return the accumulated stolen time for the vcore up until `now'. 608 * The caller should hold the vcore lock. 609 */ 610 static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now) 611 { 612 u64 p; 613 unsigned long flags; 614 615 spin_lock_irqsave(&vc->stoltb_lock, flags); 616 p = vc->stolen_tb; 617 if (vc->vcore_state != VCORE_INACTIVE && 618 vc->preempt_tb != TB_NIL) 619 p += now - vc->preempt_tb; 620 spin_unlock_irqrestore(&vc->stoltb_lock, flags); 621 return p; 622 } 623 624 static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu, 625 struct kvmppc_vcore *vc) 626 { 627 struct dtl_entry *dt; 628 struct lppaca *vpa; 629 unsigned long stolen; 630 unsigned long core_stolen; 631 u64 now; 632 633 dt = vcpu->arch.dtl_ptr; 634 vpa = vcpu->arch.vpa.pinned_addr; 635 now = mftb(); 636 core_stolen = vcore_stolen_time(vc, now); 637 stolen = core_stolen - vcpu->arch.stolen_logged; 638 vcpu->arch.stolen_logged = core_stolen; 639 spin_lock_irq(&vcpu->arch.tbacct_lock); 640 stolen += vcpu->arch.busy_stolen; 641 vcpu->arch.busy_stolen = 0; 642 spin_unlock_irq(&vcpu->arch.tbacct_lock); 643 if (!dt || !vpa) 644 return; 645 memset(dt, 0, sizeof(struct dtl_entry)); 646 dt->dispatch_reason = 7; 647 dt->processor_id = cpu_to_be16(vc->pcpu + vcpu->arch.ptid); 648 dt->timebase = cpu_to_be64(now + vc->tb_offset); 649 dt->enqueue_to_dispatch_time = cpu_to_be32(stolen); 650 dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu)); 651 dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr); 652 ++dt; 653 if (dt == vcpu->arch.dtl.pinned_end) 654 dt = vcpu->arch.dtl.pinned_addr; 655 vcpu->arch.dtl_ptr = dt; 656 /* order writing *dt vs. writing vpa->dtl_idx */ 657 smp_wmb(); 658 vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index); 659 vcpu->arch.dtl.dirty = true; 660 } 661 662 static bool kvmppc_power8_compatible(struct kvm_vcpu *vcpu) 663 { 664 if (vcpu->arch.vcore->arch_compat >= PVR_ARCH_207) 665 return true; 666 if ((!vcpu->arch.vcore->arch_compat) && 667 cpu_has_feature(CPU_FTR_ARCH_207S)) 668 return true; 669 return false; 670 } 671 672 static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags, 673 unsigned long resource, unsigned long value1, 674 unsigned long value2) 675 { 676 switch (resource) { 677 case H_SET_MODE_RESOURCE_SET_CIABR: 678 if (!kvmppc_power8_compatible(vcpu)) 679 return H_P2; 680 if (value2) 681 return H_P4; 682 if (mflags) 683 return H_UNSUPPORTED_FLAG_START; 684 /* Guests can't breakpoint the hypervisor */ 685 if ((value1 & CIABR_PRIV) == CIABR_PRIV_HYPER) 686 return H_P3; 687 vcpu->arch.ciabr = value1; 688 return H_SUCCESS; 689 case H_SET_MODE_RESOURCE_SET_DAWR: 690 if (!kvmppc_power8_compatible(vcpu)) 691 return H_P2; 692 if (mflags) 693 return H_UNSUPPORTED_FLAG_START; 694 if (value2 & DABRX_HYP) 695 return H_P4; 696 vcpu->arch.dawr = value1; 697 vcpu->arch.dawrx = value2; 698 return H_SUCCESS; 699 default: 700 return H_TOO_HARD; 701 } 702 } 703 704 static int kvm_arch_vcpu_yield_to(struct kvm_vcpu *target) 705 { 706 struct kvmppc_vcore *vcore = target->arch.vcore; 707 708 /* 709 * We expect to have been called by the real mode handler 710 * (kvmppc_rm_h_confer()) which would have directly returned 711 * H_SUCCESS if the source vcore wasn't idle (e.g. if it may 712 * have useful work to do and should not confer) so we don't 713 * recheck that here. 714 */ 715 716 spin_lock(&vcore->lock); 717 if (target->arch.state == KVMPPC_VCPU_RUNNABLE && 718 vcore->vcore_state != VCORE_INACTIVE && 719 vcore->runner) 720 target = vcore->runner; 721 spin_unlock(&vcore->lock); 722 723 return kvm_vcpu_yield_to(target); 724 } 725 726 static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu) 727 { 728 int yield_count = 0; 729 struct lppaca *lppaca; 730 731 spin_lock(&vcpu->arch.vpa_update_lock); 732 lppaca = (struct lppaca *)vcpu->arch.vpa.pinned_addr; 733 if (lppaca) 734 yield_count = be32_to_cpu(lppaca->yield_count); 735 spin_unlock(&vcpu->arch.vpa_update_lock); 736 return yield_count; 737 } 738 739 int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu) 740 { 741 unsigned long req = kvmppc_get_gpr(vcpu, 3); 742 unsigned long target, ret = H_SUCCESS; 743 int yield_count; 744 struct kvm_vcpu *tvcpu; 745 int idx, rc; 746 747 if (req <= MAX_HCALL_OPCODE && 748 !test_bit(req/4, vcpu->kvm->arch.enabled_hcalls)) 749 return RESUME_HOST; 750 751 switch (req) { 752 case H_CEDE: 753 break; 754 case H_PROD: 755 target = kvmppc_get_gpr(vcpu, 4); 756 tvcpu = kvmppc_find_vcpu(vcpu->kvm, target); 757 if (!tvcpu) { 758 ret = H_PARAMETER; 759 break; 760 } 761 tvcpu->arch.prodded = 1; 762 smp_mb(); 763 if (vcpu->arch.ceded) { 764 if (swait_active(&vcpu->wq)) { 765 swake_up(&vcpu->wq); 766 vcpu->stat.halt_wakeup++; 767 } 768 } 769 break; 770 case H_CONFER: 771 target = kvmppc_get_gpr(vcpu, 4); 772 if (target == -1) 773 break; 774 tvcpu = kvmppc_find_vcpu(vcpu->kvm, target); 775 if (!tvcpu) { 776 ret = H_PARAMETER; 777 break; 778 } 779 yield_count = kvmppc_get_gpr(vcpu, 5); 780 if (kvmppc_get_yield_count(tvcpu) != yield_count) 781 break; 782 kvm_arch_vcpu_yield_to(tvcpu); 783 break; 784 case H_REGISTER_VPA: 785 ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4), 786 kvmppc_get_gpr(vcpu, 5), 787 kvmppc_get_gpr(vcpu, 6)); 788 break; 789 case H_RTAS: 790 if (list_empty(&vcpu->kvm->arch.rtas_tokens)) 791 return RESUME_HOST; 792 793 idx = srcu_read_lock(&vcpu->kvm->srcu); 794 rc = kvmppc_rtas_hcall(vcpu); 795 srcu_read_unlock(&vcpu->kvm->srcu, idx); 796 797 if (rc == -ENOENT) 798 return RESUME_HOST; 799 else if (rc == 0) 800 break; 801 802 /* Send the error out to userspace via KVM_RUN */ 803 return rc; 804 case H_LOGICAL_CI_LOAD: 805 ret = kvmppc_h_logical_ci_load(vcpu); 806 if (ret == H_TOO_HARD) 807 return RESUME_HOST; 808 break; 809 case H_LOGICAL_CI_STORE: 810 ret = kvmppc_h_logical_ci_store(vcpu); 811 if (ret == H_TOO_HARD) 812 return RESUME_HOST; 813 break; 814 case H_SET_MODE: 815 ret = kvmppc_h_set_mode(vcpu, kvmppc_get_gpr(vcpu, 4), 816 kvmppc_get_gpr(vcpu, 5), 817 kvmppc_get_gpr(vcpu, 6), 818 kvmppc_get_gpr(vcpu, 7)); 819 if (ret == H_TOO_HARD) 820 return RESUME_HOST; 821 break; 822 case H_XIRR: 823 case H_CPPR: 824 case H_EOI: 825 case H_IPI: 826 case H_IPOLL: 827 case H_XIRR_X: 828 if (kvmppc_xics_enabled(vcpu)) { 829 ret = kvmppc_xics_hcall(vcpu, req); 830 break; 831 } 832 return RESUME_HOST; 833 case H_PUT_TCE: 834 ret = kvmppc_h_put_tce(vcpu, kvmppc_get_gpr(vcpu, 4), 835 kvmppc_get_gpr(vcpu, 5), 836 kvmppc_get_gpr(vcpu, 6)); 837 if (ret == H_TOO_HARD) 838 return RESUME_HOST; 839 break; 840 case H_PUT_TCE_INDIRECT: 841 ret = kvmppc_h_put_tce_indirect(vcpu, kvmppc_get_gpr(vcpu, 4), 842 kvmppc_get_gpr(vcpu, 5), 843 kvmppc_get_gpr(vcpu, 6), 844 kvmppc_get_gpr(vcpu, 7)); 845 if (ret == H_TOO_HARD) 846 return RESUME_HOST; 847 break; 848 case H_STUFF_TCE: 849 ret = kvmppc_h_stuff_tce(vcpu, kvmppc_get_gpr(vcpu, 4), 850 kvmppc_get_gpr(vcpu, 5), 851 kvmppc_get_gpr(vcpu, 6), 852 kvmppc_get_gpr(vcpu, 7)); 853 if (ret == H_TOO_HARD) 854 return RESUME_HOST; 855 break; 856 default: 857 return RESUME_HOST; 858 } 859 kvmppc_set_gpr(vcpu, 3, ret); 860 vcpu->arch.hcall_needed = 0; 861 return RESUME_GUEST; 862 } 863 864 static int kvmppc_hcall_impl_hv(unsigned long cmd) 865 { 866 switch (cmd) { 867 case H_CEDE: 868 case H_PROD: 869 case H_CONFER: 870 case H_REGISTER_VPA: 871 case H_SET_MODE: 872 case H_LOGICAL_CI_LOAD: 873 case H_LOGICAL_CI_STORE: 874 #ifdef CONFIG_KVM_XICS 875 case H_XIRR: 876 case H_CPPR: 877 case H_EOI: 878 case H_IPI: 879 case H_IPOLL: 880 case H_XIRR_X: 881 #endif 882 return 1; 883 } 884 885 /* See if it's in the real-mode table */ 886 return kvmppc_hcall_impl_hv_realmode(cmd); 887 } 888 889 static int kvmppc_emulate_debug_inst(struct kvm_run *run, 890 struct kvm_vcpu *vcpu) 891 { 892 u32 last_inst; 893 894 if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) != 895 EMULATE_DONE) { 896 /* 897 * Fetch failed, so return to guest and 898 * try executing it again. 899 */ 900 return RESUME_GUEST; 901 } 902 903 if (last_inst == KVMPPC_INST_SW_BREAKPOINT) { 904 run->exit_reason = KVM_EXIT_DEBUG; 905 run->debug.arch.address = kvmppc_get_pc(vcpu); 906 return RESUME_HOST; 907 } else { 908 kvmppc_core_queue_program(vcpu, SRR1_PROGILL); 909 return RESUME_GUEST; 910 } 911 } 912 913 static int kvmppc_handle_exit_hv(struct kvm_run *run, struct kvm_vcpu *vcpu, 914 struct task_struct *tsk) 915 { 916 int r = RESUME_HOST; 917 918 vcpu->stat.sum_exits++; 919 920 /* 921 * This can happen if an interrupt occurs in the last stages 922 * of guest entry or the first stages of guest exit (i.e. after 923 * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV 924 * and before setting it to KVM_GUEST_MODE_HOST_HV). 925 * That can happen due to a bug, or due to a machine check 926 * occurring at just the wrong time. 927 */ 928 if (vcpu->arch.shregs.msr & MSR_HV) { 929 printk(KERN_EMERG "KVM trap in HV mode!\n"); 930 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n", 931 vcpu->arch.trap, kvmppc_get_pc(vcpu), 932 vcpu->arch.shregs.msr); 933 kvmppc_dump_regs(vcpu); 934 run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 935 run->hw.hardware_exit_reason = vcpu->arch.trap; 936 return RESUME_HOST; 937 } 938 run->exit_reason = KVM_EXIT_UNKNOWN; 939 run->ready_for_interrupt_injection = 1; 940 switch (vcpu->arch.trap) { 941 /* We're good on these - the host merely wanted to get our attention */ 942 case BOOK3S_INTERRUPT_HV_DECREMENTER: 943 vcpu->stat.dec_exits++; 944 r = RESUME_GUEST; 945 break; 946 case BOOK3S_INTERRUPT_EXTERNAL: 947 case BOOK3S_INTERRUPT_H_DOORBELL: 948 vcpu->stat.ext_intr_exits++; 949 r = RESUME_GUEST; 950 break; 951 /* HMI is hypervisor interrupt and host has handled it. Resume guest.*/ 952 case BOOK3S_INTERRUPT_HMI: 953 case BOOK3S_INTERRUPT_PERFMON: 954 r = RESUME_GUEST; 955 break; 956 case BOOK3S_INTERRUPT_MACHINE_CHECK: 957 /* 958 * Deliver a machine check interrupt to the guest. 959 * We have to do this, even if the host has handled the 960 * machine check, because machine checks use SRR0/1 and 961 * the interrupt might have trashed guest state in them. 962 */ 963 kvmppc_book3s_queue_irqprio(vcpu, 964 BOOK3S_INTERRUPT_MACHINE_CHECK); 965 r = RESUME_GUEST; 966 break; 967 case BOOK3S_INTERRUPT_PROGRAM: 968 { 969 ulong flags; 970 /* 971 * Normally program interrupts are delivered directly 972 * to the guest by the hardware, but we can get here 973 * as a result of a hypervisor emulation interrupt 974 * (e40) getting turned into a 700 by BML RTAS. 975 */ 976 flags = vcpu->arch.shregs.msr & 0x1f0000ull; 977 kvmppc_core_queue_program(vcpu, flags); 978 r = RESUME_GUEST; 979 break; 980 } 981 case BOOK3S_INTERRUPT_SYSCALL: 982 { 983 /* hcall - punt to userspace */ 984 int i; 985 986 /* hypercall with MSR_PR has already been handled in rmode, 987 * and never reaches here. 988 */ 989 990 run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3); 991 for (i = 0; i < 9; ++i) 992 run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i); 993 run->exit_reason = KVM_EXIT_PAPR_HCALL; 994 vcpu->arch.hcall_needed = 1; 995 r = RESUME_HOST; 996 break; 997 } 998 /* 999 * We get these next two if the guest accesses a page which it thinks 1000 * it has mapped but which is not actually present, either because 1001 * it is for an emulated I/O device or because the corresonding 1002 * host page has been paged out. Any other HDSI/HISI interrupts 1003 * have been handled already. 1004 */ 1005 case BOOK3S_INTERRUPT_H_DATA_STORAGE: 1006 r = RESUME_PAGE_FAULT; 1007 break; 1008 case BOOK3S_INTERRUPT_H_INST_STORAGE: 1009 vcpu->arch.fault_dar = kvmppc_get_pc(vcpu); 1010 vcpu->arch.fault_dsisr = 0; 1011 r = RESUME_PAGE_FAULT; 1012 break; 1013 /* 1014 * This occurs if the guest executes an illegal instruction. 1015 * If the guest debug is disabled, generate a program interrupt 1016 * to the guest. If guest debug is enabled, we need to check 1017 * whether the instruction is a software breakpoint instruction. 1018 * Accordingly return to Guest or Host. 1019 */ 1020 case BOOK3S_INTERRUPT_H_EMUL_ASSIST: 1021 if (vcpu->arch.emul_inst != KVM_INST_FETCH_FAILED) 1022 vcpu->arch.last_inst = kvmppc_need_byteswap(vcpu) ? 1023 swab32(vcpu->arch.emul_inst) : 1024 vcpu->arch.emul_inst; 1025 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) { 1026 r = kvmppc_emulate_debug_inst(run, vcpu); 1027 } else { 1028 kvmppc_core_queue_program(vcpu, SRR1_PROGILL); 1029 r = RESUME_GUEST; 1030 } 1031 break; 1032 /* 1033 * This occurs if the guest (kernel or userspace), does something that 1034 * is prohibited by HFSCR. We just generate a program interrupt to 1035 * the guest. 1036 */ 1037 case BOOK3S_INTERRUPT_H_FAC_UNAVAIL: 1038 kvmppc_core_queue_program(vcpu, SRR1_PROGILL); 1039 r = RESUME_GUEST; 1040 break; 1041 case BOOK3S_INTERRUPT_HV_RM_HARD: 1042 r = RESUME_PASSTHROUGH; 1043 break; 1044 default: 1045 kvmppc_dump_regs(vcpu); 1046 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n", 1047 vcpu->arch.trap, kvmppc_get_pc(vcpu), 1048 vcpu->arch.shregs.msr); 1049 run->hw.hardware_exit_reason = vcpu->arch.trap; 1050 r = RESUME_HOST; 1051 break; 1052 } 1053 1054 return r; 1055 } 1056 1057 static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu, 1058 struct kvm_sregs *sregs) 1059 { 1060 int i; 1061 1062 memset(sregs, 0, sizeof(struct kvm_sregs)); 1063 sregs->pvr = vcpu->arch.pvr; 1064 for (i = 0; i < vcpu->arch.slb_max; i++) { 1065 sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige; 1066 sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv; 1067 } 1068 1069 return 0; 1070 } 1071 1072 static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu, 1073 struct kvm_sregs *sregs) 1074 { 1075 int i, j; 1076 1077 /* Only accept the same PVR as the host's, since we can't spoof it */ 1078 if (sregs->pvr != vcpu->arch.pvr) 1079 return -EINVAL; 1080 1081 j = 0; 1082 for (i = 0; i < vcpu->arch.slb_nr; i++) { 1083 if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) { 1084 vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe; 1085 vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv; 1086 ++j; 1087 } 1088 } 1089 vcpu->arch.slb_max = j; 1090 1091 return 0; 1092 } 1093 1094 static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr, 1095 bool preserve_top32) 1096 { 1097 struct kvm *kvm = vcpu->kvm; 1098 struct kvmppc_vcore *vc = vcpu->arch.vcore; 1099 u64 mask; 1100 1101 mutex_lock(&kvm->lock); 1102 spin_lock(&vc->lock); 1103 /* 1104 * If ILE (interrupt little-endian) has changed, update the 1105 * MSR_LE bit in the intr_msr for each vcpu in this vcore. 1106 */ 1107 if ((new_lpcr & LPCR_ILE) != (vc->lpcr & LPCR_ILE)) { 1108 struct kvm_vcpu *vcpu; 1109 int i; 1110 1111 kvm_for_each_vcpu(i, vcpu, kvm) { 1112 if (vcpu->arch.vcore != vc) 1113 continue; 1114 if (new_lpcr & LPCR_ILE) 1115 vcpu->arch.intr_msr |= MSR_LE; 1116 else 1117 vcpu->arch.intr_msr &= ~MSR_LE; 1118 } 1119 } 1120 1121 /* 1122 * Userspace can only modify DPFD (default prefetch depth), 1123 * ILE (interrupt little-endian) and TC (translation control). 1124 * On POWER8 userspace can also modify AIL (alt. interrupt loc.) 1125 */ 1126 mask = LPCR_DPFD | LPCR_ILE | LPCR_TC; 1127 if (cpu_has_feature(CPU_FTR_ARCH_207S)) 1128 mask |= LPCR_AIL; 1129 1130 /* Broken 32-bit version of LPCR must not clear top bits */ 1131 if (preserve_top32) 1132 mask &= 0xFFFFFFFF; 1133 vc->lpcr = (vc->lpcr & ~mask) | (new_lpcr & mask); 1134 spin_unlock(&vc->lock); 1135 mutex_unlock(&kvm->lock); 1136 } 1137 1138 static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, 1139 union kvmppc_one_reg *val) 1140 { 1141 int r = 0; 1142 long int i; 1143 1144 switch (id) { 1145 case KVM_REG_PPC_DEBUG_INST: 1146 *val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT); 1147 break; 1148 case KVM_REG_PPC_HIOR: 1149 *val = get_reg_val(id, 0); 1150 break; 1151 case KVM_REG_PPC_DABR: 1152 *val = get_reg_val(id, vcpu->arch.dabr); 1153 break; 1154 case KVM_REG_PPC_DABRX: 1155 *val = get_reg_val(id, vcpu->arch.dabrx); 1156 break; 1157 case KVM_REG_PPC_DSCR: 1158 *val = get_reg_val(id, vcpu->arch.dscr); 1159 break; 1160 case KVM_REG_PPC_PURR: 1161 *val = get_reg_val(id, vcpu->arch.purr); 1162 break; 1163 case KVM_REG_PPC_SPURR: 1164 *val = get_reg_val(id, vcpu->arch.spurr); 1165 break; 1166 case KVM_REG_PPC_AMR: 1167 *val = get_reg_val(id, vcpu->arch.amr); 1168 break; 1169 case KVM_REG_PPC_UAMOR: 1170 *val = get_reg_val(id, vcpu->arch.uamor); 1171 break; 1172 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS: 1173 i = id - KVM_REG_PPC_MMCR0; 1174 *val = get_reg_val(id, vcpu->arch.mmcr[i]); 1175 break; 1176 case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8: 1177 i = id - KVM_REG_PPC_PMC1; 1178 *val = get_reg_val(id, vcpu->arch.pmc[i]); 1179 break; 1180 case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2: 1181 i = id - KVM_REG_PPC_SPMC1; 1182 *val = get_reg_val(id, vcpu->arch.spmc[i]); 1183 break; 1184 case KVM_REG_PPC_SIAR: 1185 *val = get_reg_val(id, vcpu->arch.siar); 1186 break; 1187 case KVM_REG_PPC_SDAR: 1188 *val = get_reg_val(id, vcpu->arch.sdar); 1189 break; 1190 case KVM_REG_PPC_SIER: 1191 *val = get_reg_val(id, vcpu->arch.sier); 1192 break; 1193 case KVM_REG_PPC_IAMR: 1194 *val = get_reg_val(id, vcpu->arch.iamr); 1195 break; 1196 case KVM_REG_PPC_PSPB: 1197 *val = get_reg_val(id, vcpu->arch.pspb); 1198 break; 1199 case KVM_REG_PPC_DPDES: 1200 *val = get_reg_val(id, vcpu->arch.vcore->dpdes); 1201 break; 1202 case KVM_REG_PPC_VTB: 1203 *val = get_reg_val(id, vcpu->arch.vcore->vtb); 1204 break; 1205 case KVM_REG_PPC_DAWR: 1206 *val = get_reg_val(id, vcpu->arch.dawr); 1207 break; 1208 case KVM_REG_PPC_DAWRX: 1209 *val = get_reg_val(id, vcpu->arch.dawrx); 1210 break; 1211 case KVM_REG_PPC_CIABR: 1212 *val = get_reg_val(id, vcpu->arch.ciabr); 1213 break; 1214 case KVM_REG_PPC_CSIGR: 1215 *val = get_reg_val(id, vcpu->arch.csigr); 1216 break; 1217 case KVM_REG_PPC_TACR: 1218 *val = get_reg_val(id, vcpu->arch.tacr); 1219 break; 1220 case KVM_REG_PPC_TCSCR: 1221 *val = get_reg_val(id, vcpu->arch.tcscr); 1222 break; 1223 case KVM_REG_PPC_PID: 1224 *val = get_reg_val(id, vcpu->arch.pid); 1225 break; 1226 case KVM_REG_PPC_ACOP: 1227 *val = get_reg_val(id, vcpu->arch.acop); 1228 break; 1229 case KVM_REG_PPC_WORT: 1230 *val = get_reg_val(id, vcpu->arch.wort); 1231 break; 1232 case KVM_REG_PPC_VPA_ADDR: 1233 spin_lock(&vcpu->arch.vpa_update_lock); 1234 *val = get_reg_val(id, vcpu->arch.vpa.next_gpa); 1235 spin_unlock(&vcpu->arch.vpa_update_lock); 1236 break; 1237 case KVM_REG_PPC_VPA_SLB: 1238 spin_lock(&vcpu->arch.vpa_update_lock); 1239 val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa; 1240 val->vpaval.length = vcpu->arch.slb_shadow.len; 1241 spin_unlock(&vcpu->arch.vpa_update_lock); 1242 break; 1243 case KVM_REG_PPC_VPA_DTL: 1244 spin_lock(&vcpu->arch.vpa_update_lock); 1245 val->vpaval.addr = vcpu->arch.dtl.next_gpa; 1246 val->vpaval.length = vcpu->arch.dtl.len; 1247 spin_unlock(&vcpu->arch.vpa_update_lock); 1248 break; 1249 case KVM_REG_PPC_TB_OFFSET: 1250 *val = get_reg_val(id, vcpu->arch.vcore->tb_offset); 1251 break; 1252 case KVM_REG_PPC_LPCR: 1253 case KVM_REG_PPC_LPCR_64: 1254 *val = get_reg_val(id, vcpu->arch.vcore->lpcr); 1255 break; 1256 case KVM_REG_PPC_PPR: 1257 *val = get_reg_val(id, vcpu->arch.ppr); 1258 break; 1259 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 1260 case KVM_REG_PPC_TFHAR: 1261 *val = get_reg_val(id, vcpu->arch.tfhar); 1262 break; 1263 case KVM_REG_PPC_TFIAR: 1264 *val = get_reg_val(id, vcpu->arch.tfiar); 1265 break; 1266 case KVM_REG_PPC_TEXASR: 1267 *val = get_reg_val(id, vcpu->arch.texasr); 1268 break; 1269 case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31: 1270 i = id - KVM_REG_PPC_TM_GPR0; 1271 *val = get_reg_val(id, vcpu->arch.gpr_tm[i]); 1272 break; 1273 case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63: 1274 { 1275 int j; 1276 i = id - KVM_REG_PPC_TM_VSR0; 1277 if (i < 32) 1278 for (j = 0; j < TS_FPRWIDTH; j++) 1279 val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j]; 1280 else { 1281 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 1282 val->vval = vcpu->arch.vr_tm.vr[i-32]; 1283 else 1284 r = -ENXIO; 1285 } 1286 break; 1287 } 1288 case KVM_REG_PPC_TM_CR: 1289 *val = get_reg_val(id, vcpu->arch.cr_tm); 1290 break; 1291 case KVM_REG_PPC_TM_LR: 1292 *val = get_reg_val(id, vcpu->arch.lr_tm); 1293 break; 1294 case KVM_REG_PPC_TM_CTR: 1295 *val = get_reg_val(id, vcpu->arch.ctr_tm); 1296 break; 1297 case KVM_REG_PPC_TM_FPSCR: 1298 *val = get_reg_val(id, vcpu->arch.fp_tm.fpscr); 1299 break; 1300 case KVM_REG_PPC_TM_AMR: 1301 *val = get_reg_val(id, vcpu->arch.amr_tm); 1302 break; 1303 case KVM_REG_PPC_TM_PPR: 1304 *val = get_reg_val(id, vcpu->arch.ppr_tm); 1305 break; 1306 case KVM_REG_PPC_TM_VRSAVE: 1307 *val = get_reg_val(id, vcpu->arch.vrsave_tm); 1308 break; 1309 case KVM_REG_PPC_TM_VSCR: 1310 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 1311 *val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]); 1312 else 1313 r = -ENXIO; 1314 break; 1315 case KVM_REG_PPC_TM_DSCR: 1316 *val = get_reg_val(id, vcpu->arch.dscr_tm); 1317 break; 1318 case KVM_REG_PPC_TM_TAR: 1319 *val = get_reg_val(id, vcpu->arch.tar_tm); 1320 break; 1321 #endif 1322 case KVM_REG_PPC_ARCH_COMPAT: 1323 *val = get_reg_val(id, vcpu->arch.vcore->arch_compat); 1324 break; 1325 default: 1326 r = -EINVAL; 1327 break; 1328 } 1329 1330 return r; 1331 } 1332 1333 static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, 1334 union kvmppc_one_reg *val) 1335 { 1336 int r = 0; 1337 long int i; 1338 unsigned long addr, len; 1339 1340 switch (id) { 1341 case KVM_REG_PPC_HIOR: 1342 /* Only allow this to be set to zero */ 1343 if (set_reg_val(id, *val)) 1344 r = -EINVAL; 1345 break; 1346 case KVM_REG_PPC_DABR: 1347 vcpu->arch.dabr = set_reg_val(id, *val); 1348 break; 1349 case KVM_REG_PPC_DABRX: 1350 vcpu->arch.dabrx = set_reg_val(id, *val) & ~DABRX_HYP; 1351 break; 1352 case KVM_REG_PPC_DSCR: 1353 vcpu->arch.dscr = set_reg_val(id, *val); 1354 break; 1355 case KVM_REG_PPC_PURR: 1356 vcpu->arch.purr = set_reg_val(id, *val); 1357 break; 1358 case KVM_REG_PPC_SPURR: 1359 vcpu->arch.spurr = set_reg_val(id, *val); 1360 break; 1361 case KVM_REG_PPC_AMR: 1362 vcpu->arch.amr = set_reg_val(id, *val); 1363 break; 1364 case KVM_REG_PPC_UAMOR: 1365 vcpu->arch.uamor = set_reg_val(id, *val); 1366 break; 1367 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS: 1368 i = id - KVM_REG_PPC_MMCR0; 1369 vcpu->arch.mmcr[i] = set_reg_val(id, *val); 1370 break; 1371 case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8: 1372 i = id - KVM_REG_PPC_PMC1; 1373 vcpu->arch.pmc[i] = set_reg_val(id, *val); 1374 break; 1375 case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2: 1376 i = id - KVM_REG_PPC_SPMC1; 1377 vcpu->arch.spmc[i] = set_reg_val(id, *val); 1378 break; 1379 case KVM_REG_PPC_SIAR: 1380 vcpu->arch.siar = set_reg_val(id, *val); 1381 break; 1382 case KVM_REG_PPC_SDAR: 1383 vcpu->arch.sdar = set_reg_val(id, *val); 1384 break; 1385 case KVM_REG_PPC_SIER: 1386 vcpu->arch.sier = set_reg_val(id, *val); 1387 break; 1388 case KVM_REG_PPC_IAMR: 1389 vcpu->arch.iamr = set_reg_val(id, *val); 1390 break; 1391 case KVM_REG_PPC_PSPB: 1392 vcpu->arch.pspb = set_reg_val(id, *val); 1393 break; 1394 case KVM_REG_PPC_DPDES: 1395 vcpu->arch.vcore->dpdes = set_reg_val(id, *val); 1396 break; 1397 case KVM_REG_PPC_VTB: 1398 vcpu->arch.vcore->vtb = set_reg_val(id, *val); 1399 break; 1400 case KVM_REG_PPC_DAWR: 1401 vcpu->arch.dawr = set_reg_val(id, *val); 1402 break; 1403 case KVM_REG_PPC_DAWRX: 1404 vcpu->arch.dawrx = set_reg_val(id, *val) & ~DAWRX_HYP; 1405 break; 1406 case KVM_REG_PPC_CIABR: 1407 vcpu->arch.ciabr = set_reg_val(id, *val); 1408 /* Don't allow setting breakpoints in hypervisor code */ 1409 if ((vcpu->arch.ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER) 1410 vcpu->arch.ciabr &= ~CIABR_PRIV; /* disable */ 1411 break; 1412 case KVM_REG_PPC_CSIGR: 1413 vcpu->arch.csigr = set_reg_val(id, *val); 1414 break; 1415 case KVM_REG_PPC_TACR: 1416 vcpu->arch.tacr = set_reg_val(id, *val); 1417 break; 1418 case KVM_REG_PPC_TCSCR: 1419 vcpu->arch.tcscr = set_reg_val(id, *val); 1420 break; 1421 case KVM_REG_PPC_PID: 1422 vcpu->arch.pid = set_reg_val(id, *val); 1423 break; 1424 case KVM_REG_PPC_ACOP: 1425 vcpu->arch.acop = set_reg_val(id, *val); 1426 break; 1427 case KVM_REG_PPC_WORT: 1428 vcpu->arch.wort = set_reg_val(id, *val); 1429 break; 1430 case KVM_REG_PPC_VPA_ADDR: 1431 addr = set_reg_val(id, *val); 1432 r = -EINVAL; 1433 if (!addr && (vcpu->arch.slb_shadow.next_gpa || 1434 vcpu->arch.dtl.next_gpa)) 1435 break; 1436 r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca)); 1437 break; 1438 case KVM_REG_PPC_VPA_SLB: 1439 addr = val->vpaval.addr; 1440 len = val->vpaval.length; 1441 r = -EINVAL; 1442 if (addr && !vcpu->arch.vpa.next_gpa) 1443 break; 1444 r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len); 1445 break; 1446 case KVM_REG_PPC_VPA_DTL: 1447 addr = val->vpaval.addr; 1448 len = val->vpaval.length; 1449 r = -EINVAL; 1450 if (addr && (len < sizeof(struct dtl_entry) || 1451 !vcpu->arch.vpa.next_gpa)) 1452 break; 1453 len -= len % sizeof(struct dtl_entry); 1454 r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len); 1455 break; 1456 case KVM_REG_PPC_TB_OFFSET: 1457 /* round up to multiple of 2^24 */ 1458 vcpu->arch.vcore->tb_offset = 1459 ALIGN(set_reg_val(id, *val), 1UL << 24); 1460 break; 1461 case KVM_REG_PPC_LPCR: 1462 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), true); 1463 break; 1464 case KVM_REG_PPC_LPCR_64: 1465 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), false); 1466 break; 1467 case KVM_REG_PPC_PPR: 1468 vcpu->arch.ppr = set_reg_val(id, *val); 1469 break; 1470 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 1471 case KVM_REG_PPC_TFHAR: 1472 vcpu->arch.tfhar = set_reg_val(id, *val); 1473 break; 1474 case KVM_REG_PPC_TFIAR: 1475 vcpu->arch.tfiar = set_reg_val(id, *val); 1476 break; 1477 case KVM_REG_PPC_TEXASR: 1478 vcpu->arch.texasr = set_reg_val(id, *val); 1479 break; 1480 case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31: 1481 i = id - KVM_REG_PPC_TM_GPR0; 1482 vcpu->arch.gpr_tm[i] = set_reg_val(id, *val); 1483 break; 1484 case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63: 1485 { 1486 int j; 1487 i = id - KVM_REG_PPC_TM_VSR0; 1488 if (i < 32) 1489 for (j = 0; j < TS_FPRWIDTH; j++) 1490 vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j]; 1491 else 1492 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 1493 vcpu->arch.vr_tm.vr[i-32] = val->vval; 1494 else 1495 r = -ENXIO; 1496 break; 1497 } 1498 case KVM_REG_PPC_TM_CR: 1499 vcpu->arch.cr_tm = set_reg_val(id, *val); 1500 break; 1501 case KVM_REG_PPC_TM_LR: 1502 vcpu->arch.lr_tm = set_reg_val(id, *val); 1503 break; 1504 case KVM_REG_PPC_TM_CTR: 1505 vcpu->arch.ctr_tm = set_reg_val(id, *val); 1506 break; 1507 case KVM_REG_PPC_TM_FPSCR: 1508 vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val); 1509 break; 1510 case KVM_REG_PPC_TM_AMR: 1511 vcpu->arch.amr_tm = set_reg_val(id, *val); 1512 break; 1513 case KVM_REG_PPC_TM_PPR: 1514 vcpu->arch.ppr_tm = set_reg_val(id, *val); 1515 break; 1516 case KVM_REG_PPC_TM_VRSAVE: 1517 vcpu->arch.vrsave_tm = set_reg_val(id, *val); 1518 break; 1519 case KVM_REG_PPC_TM_VSCR: 1520 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 1521 vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val); 1522 else 1523 r = - ENXIO; 1524 break; 1525 case KVM_REG_PPC_TM_DSCR: 1526 vcpu->arch.dscr_tm = set_reg_val(id, *val); 1527 break; 1528 case KVM_REG_PPC_TM_TAR: 1529 vcpu->arch.tar_tm = set_reg_val(id, *val); 1530 break; 1531 #endif 1532 case KVM_REG_PPC_ARCH_COMPAT: 1533 r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val)); 1534 break; 1535 default: 1536 r = -EINVAL; 1537 break; 1538 } 1539 1540 return r; 1541 } 1542 1543 static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int core) 1544 { 1545 struct kvmppc_vcore *vcore; 1546 1547 vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL); 1548 1549 if (vcore == NULL) 1550 return NULL; 1551 1552 spin_lock_init(&vcore->lock); 1553 spin_lock_init(&vcore->stoltb_lock); 1554 init_swait_queue_head(&vcore->wq); 1555 vcore->preempt_tb = TB_NIL; 1556 vcore->lpcr = kvm->arch.lpcr; 1557 vcore->first_vcpuid = core * threads_per_subcore; 1558 vcore->kvm = kvm; 1559 INIT_LIST_HEAD(&vcore->preempt_list); 1560 1561 return vcore; 1562 } 1563 1564 #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING 1565 static struct debugfs_timings_element { 1566 const char *name; 1567 size_t offset; 1568 } timings[] = { 1569 {"rm_entry", offsetof(struct kvm_vcpu, arch.rm_entry)}, 1570 {"rm_intr", offsetof(struct kvm_vcpu, arch.rm_intr)}, 1571 {"rm_exit", offsetof(struct kvm_vcpu, arch.rm_exit)}, 1572 {"guest", offsetof(struct kvm_vcpu, arch.guest_time)}, 1573 {"cede", offsetof(struct kvm_vcpu, arch.cede_time)}, 1574 }; 1575 1576 #define N_TIMINGS (sizeof(timings) / sizeof(timings[0])) 1577 1578 struct debugfs_timings_state { 1579 struct kvm_vcpu *vcpu; 1580 unsigned int buflen; 1581 char buf[N_TIMINGS * 100]; 1582 }; 1583 1584 static int debugfs_timings_open(struct inode *inode, struct file *file) 1585 { 1586 struct kvm_vcpu *vcpu = inode->i_private; 1587 struct debugfs_timings_state *p; 1588 1589 p = kzalloc(sizeof(*p), GFP_KERNEL); 1590 if (!p) 1591 return -ENOMEM; 1592 1593 kvm_get_kvm(vcpu->kvm); 1594 p->vcpu = vcpu; 1595 file->private_data = p; 1596 1597 return nonseekable_open(inode, file); 1598 } 1599 1600 static int debugfs_timings_release(struct inode *inode, struct file *file) 1601 { 1602 struct debugfs_timings_state *p = file->private_data; 1603 1604 kvm_put_kvm(p->vcpu->kvm); 1605 kfree(p); 1606 return 0; 1607 } 1608 1609 static ssize_t debugfs_timings_read(struct file *file, char __user *buf, 1610 size_t len, loff_t *ppos) 1611 { 1612 struct debugfs_timings_state *p = file->private_data; 1613 struct kvm_vcpu *vcpu = p->vcpu; 1614 char *s, *buf_end; 1615 struct kvmhv_tb_accumulator tb; 1616 u64 count; 1617 loff_t pos; 1618 ssize_t n; 1619 int i, loops; 1620 bool ok; 1621 1622 if (!p->buflen) { 1623 s = p->buf; 1624 buf_end = s + sizeof(p->buf); 1625 for (i = 0; i < N_TIMINGS; ++i) { 1626 struct kvmhv_tb_accumulator *acc; 1627 1628 acc = (struct kvmhv_tb_accumulator *) 1629 ((unsigned long)vcpu + timings[i].offset); 1630 ok = false; 1631 for (loops = 0; loops < 1000; ++loops) { 1632 count = acc->seqcount; 1633 if (!(count & 1)) { 1634 smp_rmb(); 1635 tb = *acc; 1636 smp_rmb(); 1637 if (count == acc->seqcount) { 1638 ok = true; 1639 break; 1640 } 1641 } 1642 udelay(1); 1643 } 1644 if (!ok) 1645 snprintf(s, buf_end - s, "%s: stuck\n", 1646 timings[i].name); 1647 else 1648 snprintf(s, buf_end - s, 1649 "%s: %llu %llu %llu %llu\n", 1650 timings[i].name, count / 2, 1651 tb_to_ns(tb.tb_total), 1652 tb_to_ns(tb.tb_min), 1653 tb_to_ns(tb.tb_max)); 1654 s += strlen(s); 1655 } 1656 p->buflen = s - p->buf; 1657 } 1658 1659 pos = *ppos; 1660 if (pos >= p->buflen) 1661 return 0; 1662 if (len > p->buflen - pos) 1663 len = p->buflen - pos; 1664 n = copy_to_user(buf, p->buf + pos, len); 1665 if (n) { 1666 if (n == len) 1667 return -EFAULT; 1668 len -= n; 1669 } 1670 *ppos = pos + len; 1671 return len; 1672 } 1673 1674 static ssize_t debugfs_timings_write(struct file *file, const char __user *buf, 1675 size_t len, loff_t *ppos) 1676 { 1677 return -EACCES; 1678 } 1679 1680 static const struct file_operations debugfs_timings_ops = { 1681 .owner = THIS_MODULE, 1682 .open = debugfs_timings_open, 1683 .release = debugfs_timings_release, 1684 .read = debugfs_timings_read, 1685 .write = debugfs_timings_write, 1686 .llseek = generic_file_llseek, 1687 }; 1688 1689 /* Create a debugfs directory for the vcpu */ 1690 static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id) 1691 { 1692 char buf[16]; 1693 struct kvm *kvm = vcpu->kvm; 1694 1695 snprintf(buf, sizeof(buf), "vcpu%u", id); 1696 if (IS_ERR_OR_NULL(kvm->arch.debugfs_dir)) 1697 return; 1698 vcpu->arch.debugfs_dir = debugfs_create_dir(buf, kvm->arch.debugfs_dir); 1699 if (IS_ERR_OR_NULL(vcpu->arch.debugfs_dir)) 1700 return; 1701 vcpu->arch.debugfs_timings = 1702 debugfs_create_file("timings", 0444, vcpu->arch.debugfs_dir, 1703 vcpu, &debugfs_timings_ops); 1704 } 1705 1706 #else /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ 1707 static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id) 1708 { 1709 } 1710 #endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ 1711 1712 static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm, 1713 unsigned int id) 1714 { 1715 struct kvm_vcpu *vcpu; 1716 int err = -EINVAL; 1717 int core; 1718 struct kvmppc_vcore *vcore; 1719 1720 core = id / threads_per_subcore; 1721 if (core >= KVM_MAX_VCORES) 1722 goto out; 1723 1724 err = -ENOMEM; 1725 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); 1726 if (!vcpu) 1727 goto out; 1728 1729 err = kvm_vcpu_init(vcpu, kvm, id); 1730 if (err) 1731 goto free_vcpu; 1732 1733 vcpu->arch.shared = &vcpu->arch.shregs; 1734 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE 1735 /* 1736 * The shared struct is never shared on HV, 1737 * so we can always use host endianness 1738 */ 1739 #ifdef __BIG_ENDIAN__ 1740 vcpu->arch.shared_big_endian = true; 1741 #else 1742 vcpu->arch.shared_big_endian = false; 1743 #endif 1744 #endif 1745 vcpu->arch.mmcr[0] = MMCR0_FC; 1746 vcpu->arch.ctrl = CTRL_RUNLATCH; 1747 /* default to host PVR, since we can't spoof it */ 1748 kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR)); 1749 spin_lock_init(&vcpu->arch.vpa_update_lock); 1750 spin_lock_init(&vcpu->arch.tbacct_lock); 1751 vcpu->arch.busy_preempt = TB_NIL; 1752 vcpu->arch.intr_msr = MSR_SF | MSR_ME; 1753 1754 kvmppc_mmu_book3s_hv_init(vcpu); 1755 1756 vcpu->arch.state = KVMPPC_VCPU_NOTREADY; 1757 1758 init_waitqueue_head(&vcpu->arch.cpu_run); 1759 1760 mutex_lock(&kvm->lock); 1761 vcore = kvm->arch.vcores[core]; 1762 if (!vcore) { 1763 vcore = kvmppc_vcore_create(kvm, core); 1764 kvm->arch.vcores[core] = vcore; 1765 kvm->arch.online_vcores++; 1766 } 1767 mutex_unlock(&kvm->lock); 1768 1769 if (!vcore) 1770 goto free_vcpu; 1771 1772 spin_lock(&vcore->lock); 1773 ++vcore->num_threads; 1774 spin_unlock(&vcore->lock); 1775 vcpu->arch.vcore = vcore; 1776 vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid; 1777 vcpu->arch.thread_cpu = -1; 1778 1779 vcpu->arch.cpu_type = KVM_CPU_3S_64; 1780 kvmppc_sanity_check(vcpu); 1781 1782 debugfs_vcpu_init(vcpu, id); 1783 1784 return vcpu; 1785 1786 free_vcpu: 1787 kmem_cache_free(kvm_vcpu_cache, vcpu); 1788 out: 1789 return ERR_PTR(err); 1790 } 1791 1792 static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa) 1793 { 1794 if (vpa->pinned_addr) 1795 kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa, 1796 vpa->dirty); 1797 } 1798 1799 static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu) 1800 { 1801 spin_lock(&vcpu->arch.vpa_update_lock); 1802 unpin_vpa(vcpu->kvm, &vcpu->arch.dtl); 1803 unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow); 1804 unpin_vpa(vcpu->kvm, &vcpu->arch.vpa); 1805 spin_unlock(&vcpu->arch.vpa_update_lock); 1806 kvm_vcpu_uninit(vcpu); 1807 kmem_cache_free(kvm_vcpu_cache, vcpu); 1808 } 1809 1810 static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu) 1811 { 1812 /* Indicate we want to get back into the guest */ 1813 return 1; 1814 } 1815 1816 static void kvmppc_set_timer(struct kvm_vcpu *vcpu) 1817 { 1818 unsigned long dec_nsec, now; 1819 1820 now = get_tb(); 1821 if (now > vcpu->arch.dec_expires) { 1822 /* decrementer has already gone negative */ 1823 kvmppc_core_queue_dec(vcpu); 1824 kvmppc_core_prepare_to_enter(vcpu); 1825 return; 1826 } 1827 dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC 1828 / tb_ticks_per_sec; 1829 hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec), 1830 HRTIMER_MODE_REL); 1831 vcpu->arch.timer_running = 1; 1832 } 1833 1834 static void kvmppc_end_cede(struct kvm_vcpu *vcpu) 1835 { 1836 vcpu->arch.ceded = 0; 1837 if (vcpu->arch.timer_running) { 1838 hrtimer_try_to_cancel(&vcpu->arch.dec_timer); 1839 vcpu->arch.timer_running = 0; 1840 } 1841 } 1842 1843 extern void __kvmppc_vcore_entry(void); 1844 1845 static void kvmppc_remove_runnable(struct kvmppc_vcore *vc, 1846 struct kvm_vcpu *vcpu) 1847 { 1848 u64 now; 1849 1850 if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE) 1851 return; 1852 spin_lock_irq(&vcpu->arch.tbacct_lock); 1853 now = mftb(); 1854 vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) - 1855 vcpu->arch.stolen_logged; 1856 vcpu->arch.busy_preempt = now; 1857 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; 1858 spin_unlock_irq(&vcpu->arch.tbacct_lock); 1859 --vc->n_runnable; 1860 WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], NULL); 1861 } 1862 1863 static int kvmppc_grab_hwthread(int cpu) 1864 { 1865 struct paca_struct *tpaca; 1866 long timeout = 10000; 1867 1868 tpaca = &paca[cpu]; 1869 1870 /* Ensure the thread won't go into the kernel if it wakes */ 1871 tpaca->kvm_hstate.kvm_vcpu = NULL; 1872 tpaca->kvm_hstate.kvm_vcore = NULL; 1873 tpaca->kvm_hstate.napping = 0; 1874 smp_wmb(); 1875 tpaca->kvm_hstate.hwthread_req = 1; 1876 1877 /* 1878 * If the thread is already executing in the kernel (e.g. handling 1879 * a stray interrupt), wait for it to get back to nap mode. 1880 * The smp_mb() is to ensure that our setting of hwthread_req 1881 * is visible before we look at hwthread_state, so if this 1882 * races with the code at system_reset_pSeries and the thread 1883 * misses our setting of hwthread_req, we are sure to see its 1884 * setting of hwthread_state, and vice versa. 1885 */ 1886 smp_mb(); 1887 while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) { 1888 if (--timeout <= 0) { 1889 pr_err("KVM: couldn't grab cpu %d\n", cpu); 1890 return -EBUSY; 1891 } 1892 udelay(1); 1893 } 1894 return 0; 1895 } 1896 1897 static void kvmppc_release_hwthread(int cpu) 1898 { 1899 struct paca_struct *tpaca; 1900 1901 tpaca = &paca[cpu]; 1902 tpaca->kvm_hstate.hwthread_req = 0; 1903 tpaca->kvm_hstate.kvm_vcpu = NULL; 1904 tpaca->kvm_hstate.kvm_vcore = NULL; 1905 tpaca->kvm_hstate.kvm_split_mode = NULL; 1906 } 1907 1908 static void kvmppc_start_thread(struct kvm_vcpu *vcpu, struct kvmppc_vcore *vc) 1909 { 1910 int cpu; 1911 struct paca_struct *tpaca; 1912 struct kvmppc_vcore *mvc = vc->master_vcore; 1913 1914 cpu = vc->pcpu; 1915 if (vcpu) { 1916 if (vcpu->arch.timer_running) { 1917 hrtimer_try_to_cancel(&vcpu->arch.dec_timer); 1918 vcpu->arch.timer_running = 0; 1919 } 1920 cpu += vcpu->arch.ptid; 1921 vcpu->cpu = mvc->pcpu; 1922 vcpu->arch.thread_cpu = cpu; 1923 } 1924 tpaca = &paca[cpu]; 1925 tpaca->kvm_hstate.kvm_vcpu = vcpu; 1926 tpaca->kvm_hstate.ptid = cpu - mvc->pcpu; 1927 /* Order stores to hstate.kvm_vcpu etc. before store to kvm_vcore */ 1928 smp_wmb(); 1929 tpaca->kvm_hstate.kvm_vcore = mvc; 1930 if (cpu != smp_processor_id()) 1931 kvmppc_ipi_thread(cpu); 1932 } 1933 1934 static void kvmppc_wait_for_nap(void) 1935 { 1936 int cpu = smp_processor_id(); 1937 int i, loops; 1938 1939 for (loops = 0; loops < 1000000; ++loops) { 1940 /* 1941 * Check if all threads are finished. 1942 * We set the vcore pointer when starting a thread 1943 * and the thread clears it when finished, so we look 1944 * for any threads that still have a non-NULL vcore ptr. 1945 */ 1946 for (i = 1; i < threads_per_subcore; ++i) 1947 if (paca[cpu + i].kvm_hstate.kvm_vcore) 1948 break; 1949 if (i == threads_per_subcore) { 1950 HMT_medium(); 1951 return; 1952 } 1953 HMT_low(); 1954 } 1955 HMT_medium(); 1956 for (i = 1; i < threads_per_subcore; ++i) 1957 if (paca[cpu + i].kvm_hstate.kvm_vcore) 1958 pr_err("KVM: CPU %d seems to be stuck\n", cpu + i); 1959 } 1960 1961 /* 1962 * Check that we are on thread 0 and that any other threads in 1963 * this core are off-line. Then grab the threads so they can't 1964 * enter the kernel. 1965 */ 1966 static int on_primary_thread(void) 1967 { 1968 int cpu = smp_processor_id(); 1969 int thr; 1970 1971 /* Are we on a primary subcore? */ 1972 if (cpu_thread_in_subcore(cpu)) 1973 return 0; 1974 1975 thr = 0; 1976 while (++thr < threads_per_subcore) 1977 if (cpu_online(cpu + thr)) 1978 return 0; 1979 1980 /* Grab all hw threads so they can't go into the kernel */ 1981 for (thr = 1; thr < threads_per_subcore; ++thr) { 1982 if (kvmppc_grab_hwthread(cpu + thr)) { 1983 /* Couldn't grab one; let the others go */ 1984 do { 1985 kvmppc_release_hwthread(cpu + thr); 1986 } while (--thr > 0); 1987 return 0; 1988 } 1989 } 1990 return 1; 1991 } 1992 1993 /* 1994 * A list of virtual cores for each physical CPU. 1995 * These are vcores that could run but their runner VCPU tasks are 1996 * (or may be) preempted. 1997 */ 1998 struct preempted_vcore_list { 1999 struct list_head list; 2000 spinlock_t lock; 2001 }; 2002 2003 static DEFINE_PER_CPU(struct preempted_vcore_list, preempted_vcores); 2004 2005 static void init_vcore_lists(void) 2006 { 2007 int cpu; 2008 2009 for_each_possible_cpu(cpu) { 2010 struct preempted_vcore_list *lp = &per_cpu(preempted_vcores, cpu); 2011 spin_lock_init(&lp->lock); 2012 INIT_LIST_HEAD(&lp->list); 2013 } 2014 } 2015 2016 static void kvmppc_vcore_preempt(struct kvmppc_vcore *vc) 2017 { 2018 struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores); 2019 2020 vc->vcore_state = VCORE_PREEMPT; 2021 vc->pcpu = smp_processor_id(); 2022 if (vc->num_threads < threads_per_subcore) { 2023 spin_lock(&lp->lock); 2024 list_add_tail(&vc->preempt_list, &lp->list); 2025 spin_unlock(&lp->lock); 2026 } 2027 2028 /* Start accumulating stolen time */ 2029 kvmppc_core_start_stolen(vc); 2030 } 2031 2032 static void kvmppc_vcore_end_preempt(struct kvmppc_vcore *vc) 2033 { 2034 struct preempted_vcore_list *lp; 2035 2036 kvmppc_core_end_stolen(vc); 2037 if (!list_empty(&vc->preempt_list)) { 2038 lp = &per_cpu(preempted_vcores, vc->pcpu); 2039 spin_lock(&lp->lock); 2040 list_del_init(&vc->preempt_list); 2041 spin_unlock(&lp->lock); 2042 } 2043 vc->vcore_state = VCORE_INACTIVE; 2044 } 2045 2046 /* 2047 * This stores information about the virtual cores currently 2048 * assigned to a physical core. 2049 */ 2050 struct core_info { 2051 int n_subcores; 2052 int max_subcore_threads; 2053 int total_threads; 2054 int subcore_threads[MAX_SUBCORES]; 2055 struct kvm *subcore_vm[MAX_SUBCORES]; 2056 struct list_head vcs[MAX_SUBCORES]; 2057 }; 2058 2059 /* 2060 * This mapping means subcores 0 and 1 can use threads 0-3 and 4-7 2061 * respectively in 2-way micro-threading (split-core) mode. 2062 */ 2063 static int subcore_thread_map[MAX_SUBCORES] = { 0, 4, 2, 6 }; 2064 2065 static void init_core_info(struct core_info *cip, struct kvmppc_vcore *vc) 2066 { 2067 int sub; 2068 2069 memset(cip, 0, sizeof(*cip)); 2070 cip->n_subcores = 1; 2071 cip->max_subcore_threads = vc->num_threads; 2072 cip->total_threads = vc->num_threads; 2073 cip->subcore_threads[0] = vc->num_threads; 2074 cip->subcore_vm[0] = vc->kvm; 2075 for (sub = 0; sub < MAX_SUBCORES; ++sub) 2076 INIT_LIST_HEAD(&cip->vcs[sub]); 2077 list_add_tail(&vc->preempt_list, &cip->vcs[0]); 2078 } 2079 2080 static bool subcore_config_ok(int n_subcores, int n_threads) 2081 { 2082 /* Can only dynamically split if unsplit to begin with */ 2083 if (n_subcores > 1 && threads_per_subcore < MAX_SMT_THREADS) 2084 return false; 2085 if (n_subcores > MAX_SUBCORES) 2086 return false; 2087 if (n_subcores > 1) { 2088 if (!(dynamic_mt_modes & 2)) 2089 n_subcores = 4; 2090 if (n_subcores > 2 && !(dynamic_mt_modes & 4)) 2091 return false; 2092 } 2093 2094 return n_subcores * roundup_pow_of_two(n_threads) <= MAX_SMT_THREADS; 2095 } 2096 2097 static void init_master_vcore(struct kvmppc_vcore *vc) 2098 { 2099 vc->master_vcore = vc; 2100 vc->entry_exit_map = 0; 2101 vc->in_guest = 0; 2102 vc->napping_threads = 0; 2103 vc->conferring_threads = 0; 2104 } 2105 2106 static bool can_dynamic_split(struct kvmppc_vcore *vc, struct core_info *cip) 2107 { 2108 int n_threads = vc->num_threads; 2109 int sub; 2110 2111 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) 2112 return false; 2113 2114 if (n_threads < cip->max_subcore_threads) 2115 n_threads = cip->max_subcore_threads; 2116 if (!subcore_config_ok(cip->n_subcores + 1, n_threads)) 2117 return false; 2118 cip->max_subcore_threads = n_threads; 2119 2120 sub = cip->n_subcores; 2121 ++cip->n_subcores; 2122 cip->total_threads += vc->num_threads; 2123 cip->subcore_threads[sub] = vc->num_threads; 2124 cip->subcore_vm[sub] = vc->kvm; 2125 init_master_vcore(vc); 2126 list_del(&vc->preempt_list); 2127 list_add_tail(&vc->preempt_list, &cip->vcs[sub]); 2128 2129 return true; 2130 } 2131 2132 /* 2133 * Work out whether it is possible to piggyback the execution of 2134 * vcore *pvc onto the execution of the other vcores described in *cip. 2135 */ 2136 static bool can_piggyback(struct kvmppc_vcore *pvc, struct core_info *cip, 2137 int target_threads) 2138 { 2139 if (cip->total_threads + pvc->num_threads > target_threads) 2140 return false; 2141 2142 return can_dynamic_split(pvc, cip); 2143 } 2144 2145 static void prepare_threads(struct kvmppc_vcore *vc) 2146 { 2147 int i; 2148 struct kvm_vcpu *vcpu; 2149 2150 for_each_runnable_thread(i, vcpu, vc) { 2151 if (signal_pending(vcpu->arch.run_task)) 2152 vcpu->arch.ret = -EINTR; 2153 else if (vcpu->arch.vpa.update_pending || 2154 vcpu->arch.slb_shadow.update_pending || 2155 vcpu->arch.dtl.update_pending) 2156 vcpu->arch.ret = RESUME_GUEST; 2157 else 2158 continue; 2159 kvmppc_remove_runnable(vc, vcpu); 2160 wake_up(&vcpu->arch.cpu_run); 2161 } 2162 } 2163 2164 static void collect_piggybacks(struct core_info *cip, int target_threads) 2165 { 2166 struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores); 2167 struct kvmppc_vcore *pvc, *vcnext; 2168 2169 spin_lock(&lp->lock); 2170 list_for_each_entry_safe(pvc, vcnext, &lp->list, preempt_list) { 2171 if (!spin_trylock(&pvc->lock)) 2172 continue; 2173 prepare_threads(pvc); 2174 if (!pvc->n_runnable) { 2175 list_del_init(&pvc->preempt_list); 2176 if (pvc->runner == NULL) { 2177 pvc->vcore_state = VCORE_INACTIVE; 2178 kvmppc_core_end_stolen(pvc); 2179 } 2180 spin_unlock(&pvc->lock); 2181 continue; 2182 } 2183 if (!can_piggyback(pvc, cip, target_threads)) { 2184 spin_unlock(&pvc->lock); 2185 continue; 2186 } 2187 kvmppc_core_end_stolen(pvc); 2188 pvc->vcore_state = VCORE_PIGGYBACK; 2189 if (cip->total_threads >= target_threads) 2190 break; 2191 } 2192 spin_unlock(&lp->lock); 2193 } 2194 2195 static void post_guest_process(struct kvmppc_vcore *vc, bool is_master) 2196 { 2197 int still_running = 0, i; 2198 u64 now; 2199 long ret; 2200 struct kvm_vcpu *vcpu; 2201 2202 spin_lock(&vc->lock); 2203 now = get_tb(); 2204 for_each_runnable_thread(i, vcpu, vc) { 2205 /* cancel pending dec exception if dec is positive */ 2206 if (now < vcpu->arch.dec_expires && 2207 kvmppc_core_pending_dec(vcpu)) 2208 kvmppc_core_dequeue_dec(vcpu); 2209 2210 trace_kvm_guest_exit(vcpu); 2211 2212 ret = RESUME_GUEST; 2213 if (vcpu->arch.trap) 2214 ret = kvmppc_handle_exit_hv(vcpu->arch.kvm_run, vcpu, 2215 vcpu->arch.run_task); 2216 2217 vcpu->arch.ret = ret; 2218 vcpu->arch.trap = 0; 2219 2220 if (is_kvmppc_resume_guest(vcpu->arch.ret)) { 2221 if (vcpu->arch.pending_exceptions) 2222 kvmppc_core_prepare_to_enter(vcpu); 2223 if (vcpu->arch.ceded) 2224 kvmppc_set_timer(vcpu); 2225 else 2226 ++still_running; 2227 } else { 2228 kvmppc_remove_runnable(vc, vcpu); 2229 wake_up(&vcpu->arch.cpu_run); 2230 } 2231 } 2232 list_del_init(&vc->preempt_list); 2233 if (!is_master) { 2234 if (still_running > 0) { 2235 kvmppc_vcore_preempt(vc); 2236 } else if (vc->runner) { 2237 vc->vcore_state = VCORE_PREEMPT; 2238 kvmppc_core_start_stolen(vc); 2239 } else { 2240 vc->vcore_state = VCORE_INACTIVE; 2241 } 2242 if (vc->n_runnable > 0 && vc->runner == NULL) { 2243 /* make sure there's a candidate runner awake */ 2244 i = -1; 2245 vcpu = next_runnable_thread(vc, &i); 2246 wake_up(&vcpu->arch.cpu_run); 2247 } 2248 } 2249 spin_unlock(&vc->lock); 2250 } 2251 2252 /* 2253 * Clear core from the list of active host cores as we are about to 2254 * enter the guest. Only do this if it is the primary thread of the 2255 * core (not if a subcore) that is entering the guest. 2256 */ 2257 static inline void kvmppc_clear_host_core(int cpu) 2258 { 2259 int core; 2260 2261 if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu)) 2262 return; 2263 /* 2264 * Memory barrier can be omitted here as we will do a smp_wmb() 2265 * later in kvmppc_start_thread and we need ensure that state is 2266 * visible to other CPUs only after we enter guest. 2267 */ 2268 core = cpu >> threads_shift; 2269 kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 0; 2270 } 2271 2272 /* 2273 * Advertise this core as an active host core since we exited the guest 2274 * Only need to do this if it is the primary thread of the core that is 2275 * exiting. 2276 */ 2277 static inline void kvmppc_set_host_core(int cpu) 2278 { 2279 int core; 2280 2281 if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu)) 2282 return; 2283 2284 /* 2285 * Memory barrier can be omitted here because we do a spin_unlock 2286 * immediately after this which provides the memory barrier. 2287 */ 2288 core = cpu >> threads_shift; 2289 kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 1; 2290 } 2291 2292 /* 2293 * Run a set of guest threads on a physical core. 2294 * Called with vc->lock held. 2295 */ 2296 static noinline void kvmppc_run_core(struct kvmppc_vcore *vc) 2297 { 2298 struct kvm_vcpu *vcpu; 2299 int i; 2300 int srcu_idx; 2301 struct core_info core_info; 2302 struct kvmppc_vcore *pvc, *vcnext; 2303 struct kvm_split_mode split_info, *sip; 2304 int split, subcore_size, active; 2305 int sub; 2306 bool thr0_done; 2307 unsigned long cmd_bit, stat_bit; 2308 int pcpu, thr; 2309 int target_threads; 2310 2311 /* 2312 * Remove from the list any threads that have a signal pending 2313 * or need a VPA update done 2314 */ 2315 prepare_threads(vc); 2316 2317 /* if the runner is no longer runnable, let the caller pick a new one */ 2318 if (vc->runner->arch.state != KVMPPC_VCPU_RUNNABLE) 2319 return; 2320 2321 /* 2322 * Initialize *vc. 2323 */ 2324 init_master_vcore(vc); 2325 vc->preempt_tb = TB_NIL; 2326 2327 /* 2328 * Make sure we are running on primary threads, and that secondary 2329 * threads are offline. Also check if the number of threads in this 2330 * guest are greater than the current system threads per guest. 2331 */ 2332 if ((threads_per_core > 1) && 2333 ((vc->num_threads > threads_per_subcore) || !on_primary_thread())) { 2334 for_each_runnable_thread(i, vcpu, vc) { 2335 vcpu->arch.ret = -EBUSY; 2336 kvmppc_remove_runnable(vc, vcpu); 2337 wake_up(&vcpu->arch.cpu_run); 2338 } 2339 goto out; 2340 } 2341 2342 /* 2343 * See if we could run any other vcores on the physical core 2344 * along with this one. 2345 */ 2346 init_core_info(&core_info, vc); 2347 pcpu = smp_processor_id(); 2348 target_threads = threads_per_subcore; 2349 if (target_smt_mode && target_smt_mode < target_threads) 2350 target_threads = target_smt_mode; 2351 if (vc->num_threads < target_threads) 2352 collect_piggybacks(&core_info, target_threads); 2353 2354 /* Decide on micro-threading (split-core) mode */ 2355 subcore_size = threads_per_subcore; 2356 cmd_bit = stat_bit = 0; 2357 split = core_info.n_subcores; 2358 sip = NULL; 2359 if (split > 1) { 2360 /* threads_per_subcore must be MAX_SMT_THREADS (8) here */ 2361 if (split == 2 && (dynamic_mt_modes & 2)) { 2362 cmd_bit = HID0_POWER8_1TO2LPAR; 2363 stat_bit = HID0_POWER8_2LPARMODE; 2364 } else { 2365 split = 4; 2366 cmd_bit = HID0_POWER8_1TO4LPAR; 2367 stat_bit = HID0_POWER8_4LPARMODE; 2368 } 2369 subcore_size = MAX_SMT_THREADS / split; 2370 sip = &split_info; 2371 memset(&split_info, 0, sizeof(split_info)); 2372 split_info.rpr = mfspr(SPRN_RPR); 2373 split_info.pmmar = mfspr(SPRN_PMMAR); 2374 split_info.ldbar = mfspr(SPRN_LDBAR); 2375 split_info.subcore_size = subcore_size; 2376 for (sub = 0; sub < core_info.n_subcores; ++sub) 2377 split_info.master_vcs[sub] = 2378 list_first_entry(&core_info.vcs[sub], 2379 struct kvmppc_vcore, preempt_list); 2380 /* order writes to split_info before kvm_split_mode pointer */ 2381 smp_wmb(); 2382 } 2383 pcpu = smp_processor_id(); 2384 for (thr = 0; thr < threads_per_subcore; ++thr) 2385 paca[pcpu + thr].kvm_hstate.kvm_split_mode = sip; 2386 2387 /* Initiate micro-threading (split-core) if required */ 2388 if (cmd_bit) { 2389 unsigned long hid0 = mfspr(SPRN_HID0); 2390 2391 hid0 |= cmd_bit | HID0_POWER8_DYNLPARDIS; 2392 mb(); 2393 mtspr(SPRN_HID0, hid0); 2394 isync(); 2395 for (;;) { 2396 hid0 = mfspr(SPRN_HID0); 2397 if (hid0 & stat_bit) 2398 break; 2399 cpu_relax(); 2400 } 2401 } 2402 2403 kvmppc_clear_host_core(pcpu); 2404 2405 /* Start all the threads */ 2406 active = 0; 2407 for (sub = 0; sub < core_info.n_subcores; ++sub) { 2408 thr = subcore_thread_map[sub]; 2409 thr0_done = false; 2410 active |= 1 << thr; 2411 list_for_each_entry(pvc, &core_info.vcs[sub], preempt_list) { 2412 pvc->pcpu = pcpu + thr; 2413 for_each_runnable_thread(i, vcpu, pvc) { 2414 kvmppc_start_thread(vcpu, pvc); 2415 kvmppc_create_dtl_entry(vcpu, pvc); 2416 trace_kvm_guest_enter(vcpu); 2417 if (!vcpu->arch.ptid) 2418 thr0_done = true; 2419 active |= 1 << (thr + vcpu->arch.ptid); 2420 } 2421 /* 2422 * We need to start the first thread of each subcore 2423 * even if it doesn't have a vcpu. 2424 */ 2425 if (pvc->master_vcore == pvc && !thr0_done) 2426 kvmppc_start_thread(NULL, pvc); 2427 thr += pvc->num_threads; 2428 } 2429 } 2430 2431 /* 2432 * Ensure that split_info.do_nap is set after setting 2433 * the vcore pointer in the PACA of the secondaries. 2434 */ 2435 smp_mb(); 2436 if (cmd_bit) 2437 split_info.do_nap = 1; /* ask secondaries to nap when done */ 2438 2439 /* 2440 * When doing micro-threading, poke the inactive threads as well. 2441 * This gets them to the nap instruction after kvm_do_nap, 2442 * which reduces the time taken to unsplit later. 2443 */ 2444 if (split > 1) 2445 for (thr = 1; thr < threads_per_subcore; ++thr) 2446 if (!(active & (1 << thr))) 2447 kvmppc_ipi_thread(pcpu + thr); 2448 2449 vc->vcore_state = VCORE_RUNNING; 2450 preempt_disable(); 2451 2452 trace_kvmppc_run_core(vc, 0); 2453 2454 for (sub = 0; sub < core_info.n_subcores; ++sub) 2455 list_for_each_entry(pvc, &core_info.vcs[sub], preempt_list) 2456 spin_unlock(&pvc->lock); 2457 2458 guest_enter(); 2459 2460 srcu_idx = srcu_read_lock(&vc->kvm->srcu); 2461 2462 __kvmppc_vcore_entry(); 2463 2464 srcu_read_unlock(&vc->kvm->srcu, srcu_idx); 2465 2466 spin_lock(&vc->lock); 2467 /* prevent other vcpu threads from doing kvmppc_start_thread() now */ 2468 vc->vcore_state = VCORE_EXITING; 2469 2470 /* wait for secondary threads to finish writing their state to memory */ 2471 kvmppc_wait_for_nap(); 2472 2473 /* Return to whole-core mode if we split the core earlier */ 2474 if (split > 1) { 2475 unsigned long hid0 = mfspr(SPRN_HID0); 2476 unsigned long loops = 0; 2477 2478 hid0 &= ~HID0_POWER8_DYNLPARDIS; 2479 stat_bit = HID0_POWER8_2LPARMODE | HID0_POWER8_4LPARMODE; 2480 mb(); 2481 mtspr(SPRN_HID0, hid0); 2482 isync(); 2483 for (;;) { 2484 hid0 = mfspr(SPRN_HID0); 2485 if (!(hid0 & stat_bit)) 2486 break; 2487 cpu_relax(); 2488 ++loops; 2489 } 2490 split_info.do_nap = 0; 2491 } 2492 2493 /* Let secondaries go back to the offline loop */ 2494 for (i = 0; i < threads_per_subcore; ++i) { 2495 kvmppc_release_hwthread(pcpu + i); 2496 if (sip && sip->napped[i]) 2497 kvmppc_ipi_thread(pcpu + i); 2498 } 2499 2500 kvmppc_set_host_core(pcpu); 2501 2502 spin_unlock(&vc->lock); 2503 2504 /* make sure updates to secondary vcpu structs are visible now */ 2505 smp_mb(); 2506 guest_exit(); 2507 2508 for (sub = 0; sub < core_info.n_subcores; ++sub) 2509 list_for_each_entry_safe(pvc, vcnext, &core_info.vcs[sub], 2510 preempt_list) 2511 post_guest_process(pvc, pvc == vc); 2512 2513 spin_lock(&vc->lock); 2514 preempt_enable(); 2515 2516 out: 2517 vc->vcore_state = VCORE_INACTIVE; 2518 trace_kvmppc_run_core(vc, 1); 2519 } 2520 2521 /* 2522 * Wait for some other vcpu thread to execute us, and 2523 * wake us up when we need to handle something in the host. 2524 */ 2525 static void kvmppc_wait_for_exec(struct kvmppc_vcore *vc, 2526 struct kvm_vcpu *vcpu, int wait_state) 2527 { 2528 DEFINE_WAIT(wait); 2529 2530 prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state); 2531 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) { 2532 spin_unlock(&vc->lock); 2533 schedule(); 2534 spin_lock(&vc->lock); 2535 } 2536 finish_wait(&vcpu->arch.cpu_run, &wait); 2537 } 2538 2539 static void grow_halt_poll_ns(struct kvmppc_vcore *vc) 2540 { 2541 /* 10us base */ 2542 if (vc->halt_poll_ns == 0 && halt_poll_ns_grow) 2543 vc->halt_poll_ns = 10000; 2544 else 2545 vc->halt_poll_ns *= halt_poll_ns_grow; 2546 2547 if (vc->halt_poll_ns > halt_poll_max_ns) 2548 vc->halt_poll_ns = halt_poll_max_ns; 2549 } 2550 2551 static void shrink_halt_poll_ns(struct kvmppc_vcore *vc) 2552 { 2553 if (halt_poll_ns_shrink == 0) 2554 vc->halt_poll_ns = 0; 2555 else 2556 vc->halt_poll_ns /= halt_poll_ns_shrink; 2557 } 2558 2559 /* Check to see if any of the runnable vcpus on the vcore have pending 2560 * exceptions or are no longer ceded 2561 */ 2562 static int kvmppc_vcore_check_block(struct kvmppc_vcore *vc) 2563 { 2564 struct kvm_vcpu *vcpu; 2565 int i; 2566 2567 for_each_runnable_thread(i, vcpu, vc) { 2568 if (vcpu->arch.pending_exceptions || !vcpu->arch.ceded) 2569 return 1; 2570 } 2571 2572 return 0; 2573 } 2574 2575 /* 2576 * All the vcpus in this vcore are idle, so wait for a decrementer 2577 * or external interrupt to one of the vcpus. vc->lock is held. 2578 */ 2579 static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc) 2580 { 2581 ktime_t cur, start_poll, start_wait; 2582 int do_sleep = 1; 2583 u64 block_ns; 2584 DECLARE_SWAITQUEUE(wait); 2585 2586 /* Poll for pending exceptions and ceded state */ 2587 cur = start_poll = ktime_get(); 2588 if (vc->halt_poll_ns) { 2589 ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns); 2590 ++vc->runner->stat.halt_attempted_poll; 2591 2592 vc->vcore_state = VCORE_POLLING; 2593 spin_unlock(&vc->lock); 2594 2595 do { 2596 if (kvmppc_vcore_check_block(vc)) { 2597 do_sleep = 0; 2598 break; 2599 } 2600 cur = ktime_get(); 2601 } while (single_task_running() && ktime_before(cur, stop)); 2602 2603 spin_lock(&vc->lock); 2604 vc->vcore_state = VCORE_INACTIVE; 2605 2606 if (!do_sleep) { 2607 ++vc->runner->stat.halt_successful_poll; 2608 goto out; 2609 } 2610 } 2611 2612 prepare_to_swait(&vc->wq, &wait, TASK_INTERRUPTIBLE); 2613 2614 if (kvmppc_vcore_check_block(vc)) { 2615 finish_swait(&vc->wq, &wait); 2616 do_sleep = 0; 2617 /* If we polled, count this as a successful poll */ 2618 if (vc->halt_poll_ns) 2619 ++vc->runner->stat.halt_successful_poll; 2620 goto out; 2621 } 2622 2623 start_wait = ktime_get(); 2624 2625 vc->vcore_state = VCORE_SLEEPING; 2626 trace_kvmppc_vcore_blocked(vc, 0); 2627 spin_unlock(&vc->lock); 2628 schedule(); 2629 finish_swait(&vc->wq, &wait); 2630 spin_lock(&vc->lock); 2631 vc->vcore_state = VCORE_INACTIVE; 2632 trace_kvmppc_vcore_blocked(vc, 1); 2633 ++vc->runner->stat.halt_successful_wait; 2634 2635 cur = ktime_get(); 2636 2637 out: 2638 block_ns = ktime_to_ns(cur) - ktime_to_ns(start_poll); 2639 2640 /* Attribute wait time */ 2641 if (do_sleep) { 2642 vc->runner->stat.halt_wait_ns += 2643 ktime_to_ns(cur) - ktime_to_ns(start_wait); 2644 /* Attribute failed poll time */ 2645 if (vc->halt_poll_ns) 2646 vc->runner->stat.halt_poll_fail_ns += 2647 ktime_to_ns(start_wait) - 2648 ktime_to_ns(start_poll); 2649 } else { 2650 /* Attribute successful poll time */ 2651 if (vc->halt_poll_ns) 2652 vc->runner->stat.halt_poll_success_ns += 2653 ktime_to_ns(cur) - 2654 ktime_to_ns(start_poll); 2655 } 2656 2657 /* Adjust poll time */ 2658 if (halt_poll_max_ns) { 2659 if (block_ns <= vc->halt_poll_ns) 2660 ; 2661 /* We slept and blocked for longer than the max halt time */ 2662 else if (vc->halt_poll_ns && block_ns > halt_poll_max_ns) 2663 shrink_halt_poll_ns(vc); 2664 /* We slept and our poll time is too small */ 2665 else if (vc->halt_poll_ns < halt_poll_max_ns && 2666 block_ns < halt_poll_max_ns) 2667 grow_halt_poll_ns(vc); 2668 } else 2669 vc->halt_poll_ns = 0; 2670 2671 trace_kvmppc_vcore_wakeup(do_sleep, block_ns); 2672 } 2673 2674 static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) 2675 { 2676 int n_ceded, i; 2677 struct kvmppc_vcore *vc; 2678 struct kvm_vcpu *v; 2679 2680 trace_kvmppc_run_vcpu_enter(vcpu); 2681 2682 kvm_run->exit_reason = 0; 2683 vcpu->arch.ret = RESUME_GUEST; 2684 vcpu->arch.trap = 0; 2685 kvmppc_update_vpas(vcpu); 2686 2687 /* 2688 * Synchronize with other threads in this virtual core 2689 */ 2690 vc = vcpu->arch.vcore; 2691 spin_lock(&vc->lock); 2692 vcpu->arch.ceded = 0; 2693 vcpu->arch.run_task = current; 2694 vcpu->arch.kvm_run = kvm_run; 2695 vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb()); 2696 vcpu->arch.state = KVMPPC_VCPU_RUNNABLE; 2697 vcpu->arch.busy_preempt = TB_NIL; 2698 WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], vcpu); 2699 ++vc->n_runnable; 2700 2701 /* 2702 * This happens the first time this is called for a vcpu. 2703 * If the vcore is already running, we may be able to start 2704 * this thread straight away and have it join in. 2705 */ 2706 if (!signal_pending(current)) { 2707 if (vc->vcore_state == VCORE_PIGGYBACK) { 2708 struct kvmppc_vcore *mvc = vc->master_vcore; 2709 if (spin_trylock(&mvc->lock)) { 2710 if (mvc->vcore_state == VCORE_RUNNING && 2711 !VCORE_IS_EXITING(mvc)) { 2712 kvmppc_create_dtl_entry(vcpu, vc); 2713 kvmppc_start_thread(vcpu, vc); 2714 trace_kvm_guest_enter(vcpu); 2715 } 2716 spin_unlock(&mvc->lock); 2717 } 2718 } else if (vc->vcore_state == VCORE_RUNNING && 2719 !VCORE_IS_EXITING(vc)) { 2720 kvmppc_create_dtl_entry(vcpu, vc); 2721 kvmppc_start_thread(vcpu, vc); 2722 trace_kvm_guest_enter(vcpu); 2723 } else if (vc->vcore_state == VCORE_SLEEPING) { 2724 swake_up(&vc->wq); 2725 } 2726 2727 } 2728 2729 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE && 2730 !signal_pending(current)) { 2731 if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL) 2732 kvmppc_vcore_end_preempt(vc); 2733 2734 if (vc->vcore_state != VCORE_INACTIVE) { 2735 kvmppc_wait_for_exec(vc, vcpu, TASK_INTERRUPTIBLE); 2736 continue; 2737 } 2738 for_each_runnable_thread(i, v, vc) { 2739 kvmppc_core_prepare_to_enter(v); 2740 if (signal_pending(v->arch.run_task)) { 2741 kvmppc_remove_runnable(vc, v); 2742 v->stat.signal_exits++; 2743 v->arch.kvm_run->exit_reason = KVM_EXIT_INTR; 2744 v->arch.ret = -EINTR; 2745 wake_up(&v->arch.cpu_run); 2746 } 2747 } 2748 if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE) 2749 break; 2750 n_ceded = 0; 2751 for_each_runnable_thread(i, v, vc) { 2752 if (!v->arch.pending_exceptions) 2753 n_ceded += v->arch.ceded; 2754 else 2755 v->arch.ceded = 0; 2756 } 2757 vc->runner = vcpu; 2758 if (n_ceded == vc->n_runnable) { 2759 kvmppc_vcore_blocked(vc); 2760 } else if (need_resched()) { 2761 kvmppc_vcore_preempt(vc); 2762 /* Let something else run */ 2763 cond_resched_lock(&vc->lock); 2764 if (vc->vcore_state == VCORE_PREEMPT) 2765 kvmppc_vcore_end_preempt(vc); 2766 } else { 2767 kvmppc_run_core(vc); 2768 } 2769 vc->runner = NULL; 2770 } 2771 2772 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE && 2773 (vc->vcore_state == VCORE_RUNNING || 2774 vc->vcore_state == VCORE_EXITING || 2775 vc->vcore_state == VCORE_PIGGYBACK)) 2776 kvmppc_wait_for_exec(vc, vcpu, TASK_UNINTERRUPTIBLE); 2777 2778 if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL) 2779 kvmppc_vcore_end_preempt(vc); 2780 2781 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) { 2782 kvmppc_remove_runnable(vc, vcpu); 2783 vcpu->stat.signal_exits++; 2784 kvm_run->exit_reason = KVM_EXIT_INTR; 2785 vcpu->arch.ret = -EINTR; 2786 } 2787 2788 if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) { 2789 /* Wake up some vcpu to run the core */ 2790 i = -1; 2791 v = next_runnable_thread(vc, &i); 2792 wake_up(&v->arch.cpu_run); 2793 } 2794 2795 trace_kvmppc_run_vcpu_exit(vcpu, kvm_run); 2796 spin_unlock(&vc->lock); 2797 return vcpu->arch.ret; 2798 } 2799 2800 static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu) 2801 { 2802 int r; 2803 int srcu_idx; 2804 2805 if (!vcpu->arch.sane) { 2806 run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 2807 return -EINVAL; 2808 } 2809 2810 kvmppc_core_prepare_to_enter(vcpu); 2811 2812 /* No need to go into the guest when all we'll do is come back out */ 2813 if (signal_pending(current)) { 2814 run->exit_reason = KVM_EXIT_INTR; 2815 return -EINTR; 2816 } 2817 2818 atomic_inc(&vcpu->kvm->arch.vcpus_running); 2819 /* Order vcpus_running vs. hpte_setup_done, see kvmppc_alloc_reset_hpt */ 2820 smp_mb(); 2821 2822 /* On the first time here, set up HTAB and VRMA */ 2823 if (!vcpu->kvm->arch.hpte_setup_done) { 2824 r = kvmppc_hv_setup_htab_rma(vcpu); 2825 if (r) 2826 goto out; 2827 } 2828 2829 flush_all_to_thread(current); 2830 2831 vcpu->arch.wqp = &vcpu->arch.vcore->wq; 2832 vcpu->arch.pgdir = current->mm->pgd; 2833 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; 2834 2835 do { 2836 r = kvmppc_run_vcpu(run, vcpu); 2837 2838 if (run->exit_reason == KVM_EXIT_PAPR_HCALL && 2839 !(vcpu->arch.shregs.msr & MSR_PR)) { 2840 trace_kvm_hcall_enter(vcpu); 2841 r = kvmppc_pseries_do_hcall(vcpu); 2842 trace_kvm_hcall_exit(vcpu, r); 2843 kvmppc_core_prepare_to_enter(vcpu); 2844 } else if (r == RESUME_PAGE_FAULT) { 2845 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 2846 r = kvmppc_book3s_hv_page_fault(run, vcpu, 2847 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); 2848 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 2849 } else if (r == RESUME_PASSTHROUGH) 2850 r = kvmppc_xics_rm_complete(vcpu, 0); 2851 } while (is_kvmppc_resume_guest(r)); 2852 2853 out: 2854 vcpu->arch.state = KVMPPC_VCPU_NOTREADY; 2855 atomic_dec(&vcpu->kvm->arch.vcpus_running); 2856 return r; 2857 } 2858 2859 static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps, 2860 int linux_psize) 2861 { 2862 struct mmu_psize_def *def = &mmu_psize_defs[linux_psize]; 2863 2864 if (!def->shift) 2865 return; 2866 (*sps)->page_shift = def->shift; 2867 (*sps)->slb_enc = def->sllp; 2868 (*sps)->enc[0].page_shift = def->shift; 2869 (*sps)->enc[0].pte_enc = def->penc[linux_psize]; 2870 /* 2871 * Add 16MB MPSS support if host supports it 2872 */ 2873 if (linux_psize != MMU_PAGE_16M && def->penc[MMU_PAGE_16M] != -1) { 2874 (*sps)->enc[1].page_shift = 24; 2875 (*sps)->enc[1].pte_enc = def->penc[MMU_PAGE_16M]; 2876 } 2877 (*sps)++; 2878 } 2879 2880 static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm, 2881 struct kvm_ppc_smmu_info *info) 2882 { 2883 struct kvm_ppc_one_seg_page_size *sps; 2884 2885 info->flags = KVM_PPC_PAGE_SIZES_REAL; 2886 if (mmu_has_feature(MMU_FTR_1T_SEGMENT)) 2887 info->flags |= KVM_PPC_1T_SEGMENTS; 2888 info->slb_size = mmu_slb_size; 2889 2890 /* We only support these sizes for now, and no muti-size segments */ 2891 sps = &info->sps[0]; 2892 kvmppc_add_seg_page_size(&sps, MMU_PAGE_4K); 2893 kvmppc_add_seg_page_size(&sps, MMU_PAGE_64K); 2894 kvmppc_add_seg_page_size(&sps, MMU_PAGE_16M); 2895 2896 return 0; 2897 } 2898 2899 /* 2900 * Get (and clear) the dirty memory log for a memory slot. 2901 */ 2902 static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm, 2903 struct kvm_dirty_log *log) 2904 { 2905 struct kvm_memslots *slots; 2906 struct kvm_memory_slot *memslot; 2907 int r; 2908 unsigned long n; 2909 2910 mutex_lock(&kvm->slots_lock); 2911 2912 r = -EINVAL; 2913 if (log->slot >= KVM_USER_MEM_SLOTS) 2914 goto out; 2915 2916 slots = kvm_memslots(kvm); 2917 memslot = id_to_memslot(slots, log->slot); 2918 r = -ENOENT; 2919 if (!memslot->dirty_bitmap) 2920 goto out; 2921 2922 n = kvm_dirty_bitmap_bytes(memslot); 2923 memset(memslot->dirty_bitmap, 0, n); 2924 2925 r = kvmppc_hv_get_dirty_log(kvm, memslot, memslot->dirty_bitmap); 2926 if (r) 2927 goto out; 2928 2929 r = -EFAULT; 2930 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) 2931 goto out; 2932 2933 r = 0; 2934 out: 2935 mutex_unlock(&kvm->slots_lock); 2936 return r; 2937 } 2938 2939 static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *free, 2940 struct kvm_memory_slot *dont) 2941 { 2942 if (!dont || free->arch.rmap != dont->arch.rmap) { 2943 vfree(free->arch.rmap); 2944 free->arch.rmap = NULL; 2945 } 2946 } 2947 2948 static int kvmppc_core_create_memslot_hv(struct kvm_memory_slot *slot, 2949 unsigned long npages) 2950 { 2951 slot->arch.rmap = vzalloc(npages * sizeof(*slot->arch.rmap)); 2952 if (!slot->arch.rmap) 2953 return -ENOMEM; 2954 2955 return 0; 2956 } 2957 2958 static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm, 2959 struct kvm_memory_slot *memslot, 2960 const struct kvm_userspace_memory_region *mem) 2961 { 2962 return 0; 2963 } 2964 2965 static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm, 2966 const struct kvm_userspace_memory_region *mem, 2967 const struct kvm_memory_slot *old, 2968 const struct kvm_memory_slot *new) 2969 { 2970 unsigned long npages = mem->memory_size >> PAGE_SHIFT; 2971 struct kvm_memslots *slots; 2972 struct kvm_memory_slot *memslot; 2973 2974 if (npages && old->npages) { 2975 /* 2976 * If modifying a memslot, reset all the rmap dirty bits. 2977 * If this is a new memslot, we don't need to do anything 2978 * since the rmap array starts out as all zeroes, 2979 * i.e. no pages are dirty. 2980 */ 2981 slots = kvm_memslots(kvm); 2982 memslot = id_to_memslot(slots, mem->slot); 2983 kvmppc_hv_get_dirty_log(kvm, memslot, NULL); 2984 } 2985 } 2986 2987 /* 2988 * Update LPCR values in kvm->arch and in vcores. 2989 * Caller must hold kvm->lock. 2990 */ 2991 void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask) 2992 { 2993 long int i; 2994 u32 cores_done = 0; 2995 2996 if ((kvm->arch.lpcr & mask) == lpcr) 2997 return; 2998 2999 kvm->arch.lpcr = (kvm->arch.lpcr & ~mask) | lpcr; 3000 3001 for (i = 0; i < KVM_MAX_VCORES; ++i) { 3002 struct kvmppc_vcore *vc = kvm->arch.vcores[i]; 3003 if (!vc) 3004 continue; 3005 spin_lock(&vc->lock); 3006 vc->lpcr = (vc->lpcr & ~mask) | lpcr; 3007 spin_unlock(&vc->lock); 3008 if (++cores_done >= kvm->arch.online_vcores) 3009 break; 3010 } 3011 } 3012 3013 static void kvmppc_mmu_destroy_hv(struct kvm_vcpu *vcpu) 3014 { 3015 return; 3016 } 3017 3018 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu) 3019 { 3020 int err = 0; 3021 struct kvm *kvm = vcpu->kvm; 3022 unsigned long hva; 3023 struct kvm_memory_slot *memslot; 3024 struct vm_area_struct *vma; 3025 unsigned long lpcr = 0, senc; 3026 unsigned long psize, porder; 3027 int srcu_idx; 3028 3029 mutex_lock(&kvm->lock); 3030 if (kvm->arch.hpte_setup_done) 3031 goto out; /* another vcpu beat us to it */ 3032 3033 /* Allocate hashed page table (if not done already) and reset it */ 3034 if (!kvm->arch.hpt_virt) { 3035 err = kvmppc_alloc_hpt(kvm, NULL); 3036 if (err) { 3037 pr_err("KVM: Couldn't alloc HPT\n"); 3038 goto out; 3039 } 3040 } 3041 3042 /* Look up the memslot for guest physical address 0 */ 3043 srcu_idx = srcu_read_lock(&kvm->srcu); 3044 memslot = gfn_to_memslot(kvm, 0); 3045 3046 /* We must have some memory at 0 by now */ 3047 err = -EINVAL; 3048 if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) 3049 goto out_srcu; 3050 3051 /* Look up the VMA for the start of this memory slot */ 3052 hva = memslot->userspace_addr; 3053 down_read(¤t->mm->mmap_sem); 3054 vma = find_vma(current->mm, hva); 3055 if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO)) 3056 goto up_out; 3057 3058 psize = vma_kernel_pagesize(vma); 3059 porder = __ilog2(psize); 3060 3061 up_read(¤t->mm->mmap_sem); 3062 3063 /* We can handle 4k, 64k or 16M pages in the VRMA */ 3064 err = -EINVAL; 3065 if (!(psize == 0x1000 || psize == 0x10000 || 3066 psize == 0x1000000)) 3067 goto out_srcu; 3068 3069 /* Update VRMASD field in the LPCR */ 3070 senc = slb_pgsize_encoding(psize); 3071 kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T | 3072 (VRMA_VSID << SLB_VSID_SHIFT_1T); 3073 /* the -4 is to account for senc values starting at 0x10 */ 3074 lpcr = senc << (LPCR_VRMASD_SH - 4); 3075 3076 /* Create HPTEs in the hash page table for the VRMA */ 3077 kvmppc_map_vrma(vcpu, memslot, porder); 3078 3079 kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD); 3080 3081 /* Order updates to kvm->arch.lpcr etc. vs. hpte_setup_done */ 3082 smp_wmb(); 3083 kvm->arch.hpte_setup_done = 1; 3084 err = 0; 3085 out_srcu: 3086 srcu_read_unlock(&kvm->srcu, srcu_idx); 3087 out: 3088 mutex_unlock(&kvm->lock); 3089 return err; 3090 3091 up_out: 3092 up_read(¤t->mm->mmap_sem); 3093 goto out_srcu; 3094 } 3095 3096 #ifdef CONFIG_KVM_XICS 3097 static int kvmppc_cpu_notify(struct notifier_block *self, unsigned long action, 3098 void *hcpu) 3099 { 3100 unsigned long cpu = (long)hcpu; 3101 3102 switch (action) { 3103 case CPU_UP_PREPARE: 3104 case CPU_UP_PREPARE_FROZEN: 3105 kvmppc_set_host_core(cpu); 3106 break; 3107 3108 #ifdef CONFIG_HOTPLUG_CPU 3109 case CPU_DEAD: 3110 case CPU_DEAD_FROZEN: 3111 case CPU_UP_CANCELED: 3112 case CPU_UP_CANCELED_FROZEN: 3113 kvmppc_clear_host_core(cpu); 3114 break; 3115 #endif 3116 default: 3117 break; 3118 } 3119 3120 return NOTIFY_OK; 3121 } 3122 3123 static struct notifier_block kvmppc_cpu_notifier = { 3124 .notifier_call = kvmppc_cpu_notify, 3125 }; 3126 3127 /* 3128 * Allocate a per-core structure for managing state about which cores are 3129 * running in the host versus the guest and for exchanging data between 3130 * real mode KVM and CPU running in the host. 3131 * This is only done for the first VM. 3132 * The allocated structure stays even if all VMs have stopped. 3133 * It is only freed when the kvm-hv module is unloaded. 3134 * It's OK for this routine to fail, we just don't support host 3135 * core operations like redirecting H_IPI wakeups. 3136 */ 3137 void kvmppc_alloc_host_rm_ops(void) 3138 { 3139 struct kvmppc_host_rm_ops *ops; 3140 unsigned long l_ops; 3141 int cpu, core; 3142 int size; 3143 3144 /* Not the first time here ? */ 3145 if (kvmppc_host_rm_ops_hv != NULL) 3146 return; 3147 3148 ops = kzalloc(sizeof(struct kvmppc_host_rm_ops), GFP_KERNEL); 3149 if (!ops) 3150 return; 3151 3152 size = cpu_nr_cores() * sizeof(struct kvmppc_host_rm_core); 3153 ops->rm_core = kzalloc(size, GFP_KERNEL); 3154 3155 if (!ops->rm_core) { 3156 kfree(ops); 3157 return; 3158 } 3159 3160 get_online_cpus(); 3161 3162 for (cpu = 0; cpu < nr_cpu_ids; cpu += threads_per_core) { 3163 if (!cpu_online(cpu)) 3164 continue; 3165 3166 core = cpu >> threads_shift; 3167 ops->rm_core[core].rm_state.in_host = 1; 3168 } 3169 3170 ops->vcpu_kick = kvmppc_fast_vcpu_kick_hv; 3171 3172 /* 3173 * Make the contents of the kvmppc_host_rm_ops structure visible 3174 * to other CPUs before we assign it to the global variable. 3175 * Do an atomic assignment (no locks used here), but if someone 3176 * beats us to it, just free our copy and return. 3177 */ 3178 smp_wmb(); 3179 l_ops = (unsigned long) ops; 3180 3181 if (cmpxchg64((unsigned long *)&kvmppc_host_rm_ops_hv, 0, l_ops)) { 3182 put_online_cpus(); 3183 kfree(ops->rm_core); 3184 kfree(ops); 3185 return; 3186 } 3187 3188 register_cpu_notifier(&kvmppc_cpu_notifier); 3189 3190 put_online_cpus(); 3191 } 3192 3193 void kvmppc_free_host_rm_ops(void) 3194 { 3195 if (kvmppc_host_rm_ops_hv) { 3196 unregister_cpu_notifier(&kvmppc_cpu_notifier); 3197 kfree(kvmppc_host_rm_ops_hv->rm_core); 3198 kfree(kvmppc_host_rm_ops_hv); 3199 kvmppc_host_rm_ops_hv = NULL; 3200 } 3201 } 3202 #endif 3203 3204 static int kvmppc_core_init_vm_hv(struct kvm *kvm) 3205 { 3206 unsigned long lpcr, lpid; 3207 char buf[32]; 3208 3209 /* Allocate the guest's logical partition ID */ 3210 3211 lpid = kvmppc_alloc_lpid(); 3212 if ((long)lpid < 0) 3213 return -ENOMEM; 3214 kvm->arch.lpid = lpid; 3215 3216 kvmppc_alloc_host_rm_ops(); 3217 3218 /* 3219 * Since we don't flush the TLB when tearing down a VM, 3220 * and this lpid might have previously been used, 3221 * make sure we flush on each core before running the new VM. 3222 */ 3223 cpumask_setall(&kvm->arch.need_tlb_flush); 3224 3225 /* Start out with the default set of hcalls enabled */ 3226 memcpy(kvm->arch.enabled_hcalls, default_enabled_hcalls, 3227 sizeof(kvm->arch.enabled_hcalls)); 3228 3229 kvm->arch.host_sdr1 = mfspr(SPRN_SDR1); 3230 3231 /* Init LPCR for virtual RMA mode */ 3232 kvm->arch.host_lpid = mfspr(SPRN_LPID); 3233 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR); 3234 lpcr &= LPCR_PECE | LPCR_LPES; 3235 lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE | 3236 LPCR_VPM0 | LPCR_VPM1; 3237 kvm->arch.vrma_slb_v = SLB_VSID_B_1T | 3238 (VRMA_VSID << SLB_VSID_SHIFT_1T); 3239 /* On POWER8 turn on online bit to enable PURR/SPURR */ 3240 if (cpu_has_feature(CPU_FTR_ARCH_207S)) 3241 lpcr |= LPCR_ONL; 3242 kvm->arch.lpcr = lpcr; 3243 3244 /* 3245 * Track that we now have a HV mode VM active. This blocks secondary 3246 * CPU threads from coming online. 3247 */ 3248 kvm_hv_vm_activated(); 3249 3250 /* 3251 * Create a debugfs directory for the VM 3252 */ 3253 snprintf(buf, sizeof(buf), "vm%d", current->pid); 3254 kvm->arch.debugfs_dir = debugfs_create_dir(buf, kvm_debugfs_dir); 3255 if (!IS_ERR_OR_NULL(kvm->arch.debugfs_dir)) 3256 kvmppc_mmu_debugfs_init(kvm); 3257 3258 return 0; 3259 } 3260 3261 static void kvmppc_free_vcores(struct kvm *kvm) 3262 { 3263 long int i; 3264 3265 for (i = 0; i < KVM_MAX_VCORES; ++i) 3266 kfree(kvm->arch.vcores[i]); 3267 kvm->arch.online_vcores = 0; 3268 } 3269 3270 static void kvmppc_core_destroy_vm_hv(struct kvm *kvm) 3271 { 3272 debugfs_remove_recursive(kvm->arch.debugfs_dir); 3273 3274 kvm_hv_vm_deactivated(); 3275 3276 kvmppc_free_vcores(kvm); 3277 3278 kvmppc_free_hpt(kvm); 3279 3280 kvmppc_free_pimap(kvm); 3281 } 3282 3283 /* We don't need to emulate any privileged instructions or dcbz */ 3284 static int kvmppc_core_emulate_op_hv(struct kvm_run *run, struct kvm_vcpu *vcpu, 3285 unsigned int inst, int *advance) 3286 { 3287 return EMULATE_FAIL; 3288 } 3289 3290 static int kvmppc_core_emulate_mtspr_hv(struct kvm_vcpu *vcpu, int sprn, 3291 ulong spr_val) 3292 { 3293 return EMULATE_FAIL; 3294 } 3295 3296 static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn, 3297 ulong *spr_val) 3298 { 3299 return EMULATE_FAIL; 3300 } 3301 3302 static int kvmppc_core_check_processor_compat_hv(void) 3303 { 3304 if (!cpu_has_feature(CPU_FTR_HVMODE) || 3305 !cpu_has_feature(CPU_FTR_ARCH_206)) 3306 return -EIO; 3307 /* 3308 * Disable KVM for Power9, untill the required bits merged. 3309 */ 3310 if (cpu_has_feature(CPU_FTR_ARCH_300)) 3311 return -EIO; 3312 3313 return 0; 3314 } 3315 3316 #ifdef CONFIG_KVM_XICS 3317 3318 void kvmppc_free_pimap(struct kvm *kvm) 3319 { 3320 kfree(kvm->arch.pimap); 3321 } 3322 3323 static struct kvmppc_passthru_irqmap *kvmppc_alloc_pimap(void) 3324 { 3325 return kzalloc(sizeof(struct kvmppc_passthru_irqmap), GFP_KERNEL); 3326 } 3327 3328 static int kvmppc_set_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi) 3329 { 3330 struct irq_desc *desc; 3331 struct kvmppc_irq_map *irq_map; 3332 struct kvmppc_passthru_irqmap *pimap; 3333 struct irq_chip *chip; 3334 int i; 3335 3336 if (!kvm_irq_bypass) 3337 return 1; 3338 3339 desc = irq_to_desc(host_irq); 3340 if (!desc) 3341 return -EIO; 3342 3343 mutex_lock(&kvm->lock); 3344 3345 pimap = kvm->arch.pimap; 3346 if (pimap == NULL) { 3347 /* First call, allocate structure to hold IRQ map */ 3348 pimap = kvmppc_alloc_pimap(); 3349 if (pimap == NULL) { 3350 mutex_unlock(&kvm->lock); 3351 return -ENOMEM; 3352 } 3353 kvm->arch.pimap = pimap; 3354 } 3355 3356 /* 3357 * For now, we only support interrupts for which the EOI operation 3358 * is an OPAL call followed by a write to XIRR, since that's 3359 * what our real-mode EOI code does. 3360 */ 3361 chip = irq_data_get_irq_chip(&desc->irq_data); 3362 if (!chip || !is_pnv_opal_msi(chip)) { 3363 pr_warn("kvmppc_set_passthru_irq_hv: Could not assign IRQ map for (%d,%d)\n", 3364 host_irq, guest_gsi); 3365 mutex_unlock(&kvm->lock); 3366 return -ENOENT; 3367 } 3368 3369 /* 3370 * See if we already have an entry for this guest IRQ number. 3371 * If it's mapped to a hardware IRQ number, that's an error, 3372 * otherwise re-use this entry. 3373 */ 3374 for (i = 0; i < pimap->n_mapped; i++) { 3375 if (guest_gsi == pimap->mapped[i].v_hwirq) { 3376 if (pimap->mapped[i].r_hwirq) { 3377 mutex_unlock(&kvm->lock); 3378 return -EINVAL; 3379 } 3380 break; 3381 } 3382 } 3383 3384 if (i == KVMPPC_PIRQ_MAPPED) { 3385 mutex_unlock(&kvm->lock); 3386 return -EAGAIN; /* table is full */ 3387 } 3388 3389 irq_map = &pimap->mapped[i]; 3390 3391 irq_map->v_hwirq = guest_gsi; 3392 irq_map->desc = desc; 3393 3394 /* 3395 * Order the above two stores before the next to serialize with 3396 * the KVM real mode handler. 3397 */ 3398 smp_wmb(); 3399 irq_map->r_hwirq = desc->irq_data.hwirq; 3400 3401 if (i == pimap->n_mapped) 3402 pimap->n_mapped++; 3403 3404 kvmppc_xics_set_mapped(kvm, guest_gsi, desc->irq_data.hwirq); 3405 3406 mutex_unlock(&kvm->lock); 3407 3408 return 0; 3409 } 3410 3411 static int kvmppc_clr_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi) 3412 { 3413 struct irq_desc *desc; 3414 struct kvmppc_passthru_irqmap *pimap; 3415 int i; 3416 3417 if (!kvm_irq_bypass) 3418 return 0; 3419 3420 desc = irq_to_desc(host_irq); 3421 if (!desc) 3422 return -EIO; 3423 3424 mutex_lock(&kvm->lock); 3425 3426 if (kvm->arch.pimap == NULL) { 3427 mutex_unlock(&kvm->lock); 3428 return 0; 3429 } 3430 pimap = kvm->arch.pimap; 3431 3432 for (i = 0; i < pimap->n_mapped; i++) { 3433 if (guest_gsi == pimap->mapped[i].v_hwirq) 3434 break; 3435 } 3436 3437 if (i == pimap->n_mapped) { 3438 mutex_unlock(&kvm->lock); 3439 return -ENODEV; 3440 } 3441 3442 kvmppc_xics_clr_mapped(kvm, guest_gsi, pimap->mapped[i].r_hwirq); 3443 3444 /* invalidate the entry */ 3445 pimap->mapped[i].r_hwirq = 0; 3446 3447 /* 3448 * We don't free this structure even when the count goes to 3449 * zero. The structure is freed when we destroy the VM. 3450 */ 3451 3452 mutex_unlock(&kvm->lock); 3453 return 0; 3454 } 3455 3456 static int kvmppc_irq_bypass_add_producer_hv(struct irq_bypass_consumer *cons, 3457 struct irq_bypass_producer *prod) 3458 { 3459 int ret = 0; 3460 struct kvm_kernel_irqfd *irqfd = 3461 container_of(cons, struct kvm_kernel_irqfd, consumer); 3462 3463 irqfd->producer = prod; 3464 3465 ret = kvmppc_set_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi); 3466 if (ret) 3467 pr_info("kvmppc_set_passthru_irq (irq %d, gsi %d) fails: %d\n", 3468 prod->irq, irqfd->gsi, ret); 3469 3470 return ret; 3471 } 3472 3473 static void kvmppc_irq_bypass_del_producer_hv(struct irq_bypass_consumer *cons, 3474 struct irq_bypass_producer *prod) 3475 { 3476 int ret; 3477 struct kvm_kernel_irqfd *irqfd = 3478 container_of(cons, struct kvm_kernel_irqfd, consumer); 3479 3480 irqfd->producer = NULL; 3481 3482 /* 3483 * When producer of consumer is unregistered, we change back to 3484 * default external interrupt handling mode - KVM real mode 3485 * will switch back to host. 3486 */ 3487 ret = kvmppc_clr_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi); 3488 if (ret) 3489 pr_warn("kvmppc_clr_passthru_irq (irq %d, gsi %d) fails: %d\n", 3490 prod->irq, irqfd->gsi, ret); 3491 } 3492 #endif 3493 3494 static long kvm_arch_vm_ioctl_hv(struct file *filp, 3495 unsigned int ioctl, unsigned long arg) 3496 { 3497 struct kvm *kvm __maybe_unused = filp->private_data; 3498 void __user *argp = (void __user *)arg; 3499 long r; 3500 3501 switch (ioctl) { 3502 3503 case KVM_PPC_ALLOCATE_HTAB: { 3504 u32 htab_order; 3505 3506 r = -EFAULT; 3507 if (get_user(htab_order, (u32 __user *)argp)) 3508 break; 3509 r = kvmppc_alloc_reset_hpt(kvm, &htab_order); 3510 if (r) 3511 break; 3512 r = -EFAULT; 3513 if (put_user(htab_order, (u32 __user *)argp)) 3514 break; 3515 r = 0; 3516 break; 3517 } 3518 3519 case KVM_PPC_GET_HTAB_FD: { 3520 struct kvm_get_htab_fd ghf; 3521 3522 r = -EFAULT; 3523 if (copy_from_user(&ghf, argp, sizeof(ghf))) 3524 break; 3525 r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf); 3526 break; 3527 } 3528 3529 default: 3530 r = -ENOTTY; 3531 } 3532 3533 return r; 3534 } 3535 3536 /* 3537 * List of hcall numbers to enable by default. 3538 * For compatibility with old userspace, we enable by default 3539 * all hcalls that were implemented before the hcall-enabling 3540 * facility was added. Note this list should not include H_RTAS. 3541 */ 3542 static unsigned int default_hcall_list[] = { 3543 H_REMOVE, 3544 H_ENTER, 3545 H_READ, 3546 H_PROTECT, 3547 H_BULK_REMOVE, 3548 H_GET_TCE, 3549 H_PUT_TCE, 3550 H_SET_DABR, 3551 H_SET_XDABR, 3552 H_CEDE, 3553 H_PROD, 3554 H_CONFER, 3555 H_REGISTER_VPA, 3556 #ifdef CONFIG_KVM_XICS 3557 H_EOI, 3558 H_CPPR, 3559 H_IPI, 3560 H_IPOLL, 3561 H_XIRR, 3562 H_XIRR_X, 3563 #endif 3564 0 3565 }; 3566 3567 static void init_default_hcalls(void) 3568 { 3569 int i; 3570 unsigned int hcall; 3571 3572 for (i = 0; default_hcall_list[i]; ++i) { 3573 hcall = default_hcall_list[i]; 3574 WARN_ON(!kvmppc_hcall_impl_hv(hcall)); 3575 __set_bit(hcall / 4, default_enabled_hcalls); 3576 } 3577 } 3578 3579 static struct kvmppc_ops kvm_ops_hv = { 3580 .get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv, 3581 .set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv, 3582 .get_one_reg = kvmppc_get_one_reg_hv, 3583 .set_one_reg = kvmppc_set_one_reg_hv, 3584 .vcpu_load = kvmppc_core_vcpu_load_hv, 3585 .vcpu_put = kvmppc_core_vcpu_put_hv, 3586 .set_msr = kvmppc_set_msr_hv, 3587 .vcpu_run = kvmppc_vcpu_run_hv, 3588 .vcpu_create = kvmppc_core_vcpu_create_hv, 3589 .vcpu_free = kvmppc_core_vcpu_free_hv, 3590 .check_requests = kvmppc_core_check_requests_hv, 3591 .get_dirty_log = kvm_vm_ioctl_get_dirty_log_hv, 3592 .flush_memslot = kvmppc_core_flush_memslot_hv, 3593 .prepare_memory_region = kvmppc_core_prepare_memory_region_hv, 3594 .commit_memory_region = kvmppc_core_commit_memory_region_hv, 3595 .unmap_hva = kvm_unmap_hva_hv, 3596 .unmap_hva_range = kvm_unmap_hva_range_hv, 3597 .age_hva = kvm_age_hva_hv, 3598 .test_age_hva = kvm_test_age_hva_hv, 3599 .set_spte_hva = kvm_set_spte_hva_hv, 3600 .mmu_destroy = kvmppc_mmu_destroy_hv, 3601 .free_memslot = kvmppc_core_free_memslot_hv, 3602 .create_memslot = kvmppc_core_create_memslot_hv, 3603 .init_vm = kvmppc_core_init_vm_hv, 3604 .destroy_vm = kvmppc_core_destroy_vm_hv, 3605 .get_smmu_info = kvm_vm_ioctl_get_smmu_info_hv, 3606 .emulate_op = kvmppc_core_emulate_op_hv, 3607 .emulate_mtspr = kvmppc_core_emulate_mtspr_hv, 3608 .emulate_mfspr = kvmppc_core_emulate_mfspr_hv, 3609 .fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv, 3610 .arch_vm_ioctl = kvm_arch_vm_ioctl_hv, 3611 .hcall_implemented = kvmppc_hcall_impl_hv, 3612 #ifdef CONFIG_KVM_XICS 3613 .irq_bypass_add_producer = kvmppc_irq_bypass_add_producer_hv, 3614 .irq_bypass_del_producer = kvmppc_irq_bypass_del_producer_hv, 3615 #endif 3616 }; 3617 3618 static int kvm_init_subcore_bitmap(void) 3619 { 3620 int i, j; 3621 int nr_cores = cpu_nr_cores(); 3622 struct sibling_subcore_state *sibling_subcore_state; 3623 3624 for (i = 0; i < nr_cores; i++) { 3625 int first_cpu = i * threads_per_core; 3626 int node = cpu_to_node(first_cpu); 3627 3628 /* Ignore if it is already allocated. */ 3629 if (paca[first_cpu].sibling_subcore_state) 3630 continue; 3631 3632 sibling_subcore_state = 3633 kmalloc_node(sizeof(struct sibling_subcore_state), 3634 GFP_KERNEL, node); 3635 if (!sibling_subcore_state) 3636 return -ENOMEM; 3637 3638 memset(sibling_subcore_state, 0, 3639 sizeof(struct sibling_subcore_state)); 3640 3641 for (j = 0; j < threads_per_core; j++) { 3642 int cpu = first_cpu + j; 3643 3644 paca[cpu].sibling_subcore_state = sibling_subcore_state; 3645 } 3646 } 3647 return 0; 3648 } 3649 3650 static int kvmppc_book3s_init_hv(void) 3651 { 3652 int r; 3653 /* 3654 * FIXME!! Do we need to check on all cpus ? 3655 */ 3656 r = kvmppc_core_check_processor_compat_hv(); 3657 if (r < 0) 3658 return -ENODEV; 3659 3660 r = kvm_init_subcore_bitmap(); 3661 if (r) 3662 return r; 3663 3664 kvm_ops_hv.owner = THIS_MODULE; 3665 kvmppc_hv_ops = &kvm_ops_hv; 3666 3667 init_default_hcalls(); 3668 3669 init_vcore_lists(); 3670 3671 r = kvmppc_mmu_hv_init(); 3672 return r; 3673 } 3674 3675 static void kvmppc_book3s_exit_hv(void) 3676 { 3677 kvmppc_free_host_rm_ops(); 3678 kvmppc_hv_ops = NULL; 3679 } 3680 3681 module_init(kvmppc_book3s_init_hv); 3682 module_exit(kvmppc_book3s_exit_hv); 3683 MODULE_LICENSE("GPL"); 3684 MODULE_ALIAS_MISCDEV(KVM_MINOR); 3685 MODULE_ALIAS("devname:kvm"); 3686