1 /* 2 * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved. 3 * 4 * Authors: 5 * Alexander Graf <agraf@suse.de> 6 * Kevin Wolf <mail@kevin-wolf.de> 7 * Paul Mackerras <paulus@samba.org> 8 * 9 * Description: 10 * Functions relating to running KVM on Book 3S processors where 11 * we don't have access to hypervisor mode, and we run the guest 12 * in problem state (user mode). 13 * 14 * This file is derived from arch/powerpc/kvm/44x.c, 15 * by Hollis Blanchard <hollisb@us.ibm.com>. 16 * 17 * This program is free software; you can redistribute it and/or modify 18 * it under the terms of the GNU General Public License, version 2, as 19 * published by the Free Software Foundation. 20 */ 21 22 #include <linux/kvm_host.h> 23 #include <linux/export.h> 24 #include <linux/err.h> 25 #include <linux/slab.h> 26 27 #include <asm/reg.h> 28 #include <asm/cputable.h> 29 #include <asm/cacheflush.h> 30 #include <asm/tlbflush.h> 31 #include <asm/uaccess.h> 32 #include <asm/io.h> 33 #include <asm/kvm_ppc.h> 34 #include <asm/kvm_book3s.h> 35 #include <asm/mmu_context.h> 36 #include <linux/gfp.h> 37 #include <linux/sched.h> 38 #include <linux/vmalloc.h> 39 #include <linux/highmem.h> 40 41 #include "trace.h" 42 43 /* #define EXIT_DEBUG */ 44 /* #define DEBUG_EXT */ 45 46 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr, 47 ulong msr); 48 49 /* Some compatibility defines */ 50 #ifdef CONFIG_PPC_BOOK3S_32 51 #define MSR_USER32 MSR_USER 52 #define MSR_USER64 MSR_USER 53 #define HW_PAGE_SIZE PAGE_SIZE 54 #endif 55 56 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 57 { 58 #ifdef CONFIG_PPC_BOOK3S_64 59 memcpy(to_svcpu(vcpu)->slb, to_book3s(vcpu)->slb_shadow, sizeof(to_svcpu(vcpu)->slb)); 60 memcpy(&get_paca()->shadow_vcpu, to_book3s(vcpu)->shadow_vcpu, 61 sizeof(get_paca()->shadow_vcpu)); 62 to_svcpu(vcpu)->slb_max = to_book3s(vcpu)->slb_shadow_max; 63 #endif 64 65 #ifdef CONFIG_PPC_BOOK3S_32 66 current->thread.kvm_shadow_vcpu = to_book3s(vcpu)->shadow_vcpu; 67 #endif 68 } 69 70 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu) 71 { 72 #ifdef CONFIG_PPC_BOOK3S_64 73 memcpy(to_book3s(vcpu)->slb_shadow, to_svcpu(vcpu)->slb, sizeof(to_svcpu(vcpu)->slb)); 74 memcpy(to_book3s(vcpu)->shadow_vcpu, &get_paca()->shadow_vcpu, 75 sizeof(get_paca()->shadow_vcpu)); 76 to_book3s(vcpu)->slb_shadow_max = to_svcpu(vcpu)->slb_max; 77 #endif 78 79 kvmppc_giveup_ext(vcpu, MSR_FP); 80 kvmppc_giveup_ext(vcpu, MSR_VEC); 81 kvmppc_giveup_ext(vcpu, MSR_VSX); 82 } 83 84 static void kvmppc_recalc_shadow_msr(struct kvm_vcpu *vcpu) 85 { 86 ulong smsr = vcpu->arch.shared->msr; 87 88 /* Guest MSR values */ 89 smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE | MSR_DE; 90 /* Process MSR values */ 91 smsr |= MSR_ME | MSR_RI | MSR_IR | MSR_DR | MSR_PR | MSR_EE; 92 /* External providers the guest reserved */ 93 smsr |= (vcpu->arch.shared->msr & vcpu->arch.guest_owned_ext); 94 /* 64-bit Process MSR values */ 95 #ifdef CONFIG_PPC_BOOK3S_64 96 smsr |= MSR_ISF | MSR_HV; 97 #endif 98 vcpu->arch.shadow_msr = smsr; 99 } 100 101 void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr) 102 { 103 ulong old_msr = vcpu->arch.shared->msr; 104 105 #ifdef EXIT_DEBUG 106 printk(KERN_INFO "KVM: Set MSR to 0x%llx\n", msr); 107 #endif 108 109 msr &= to_book3s(vcpu)->msr_mask; 110 vcpu->arch.shared->msr = msr; 111 kvmppc_recalc_shadow_msr(vcpu); 112 113 if (msr & MSR_POW) { 114 if (!vcpu->arch.pending_exceptions) { 115 kvm_vcpu_block(vcpu); 116 vcpu->stat.halt_wakeup++; 117 118 /* Unset POW bit after we woke up */ 119 msr &= ~MSR_POW; 120 vcpu->arch.shared->msr = msr; 121 } 122 } 123 124 if ((vcpu->arch.shared->msr & (MSR_PR|MSR_IR|MSR_DR)) != 125 (old_msr & (MSR_PR|MSR_IR|MSR_DR))) { 126 kvmppc_mmu_flush_segments(vcpu); 127 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)); 128 129 /* Preload magic page segment when in kernel mode */ 130 if (!(msr & MSR_PR) && vcpu->arch.magic_page_pa) { 131 struct kvm_vcpu_arch *a = &vcpu->arch; 132 133 if (msr & MSR_DR) 134 kvmppc_mmu_map_segment(vcpu, a->magic_page_ea); 135 else 136 kvmppc_mmu_map_segment(vcpu, a->magic_page_pa); 137 } 138 } 139 140 /* Preload FPU if it's enabled */ 141 if (vcpu->arch.shared->msr & MSR_FP) 142 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP); 143 } 144 145 void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr) 146 { 147 u32 host_pvr; 148 149 vcpu->arch.hflags &= ~BOOK3S_HFLAG_SLB; 150 vcpu->arch.pvr = pvr; 151 #ifdef CONFIG_PPC_BOOK3S_64 152 if ((pvr >= 0x330000) && (pvr < 0x70330000)) { 153 kvmppc_mmu_book3s_64_init(vcpu); 154 if (!to_book3s(vcpu)->hior_sregs) 155 to_book3s(vcpu)->hior = 0xfff00000; 156 to_book3s(vcpu)->msr_mask = 0xffffffffffffffffULL; 157 vcpu->arch.cpu_type = KVM_CPU_3S_64; 158 } else 159 #endif 160 { 161 kvmppc_mmu_book3s_32_init(vcpu); 162 if (!to_book3s(vcpu)->hior_sregs) 163 to_book3s(vcpu)->hior = 0; 164 to_book3s(vcpu)->msr_mask = 0xffffffffULL; 165 vcpu->arch.cpu_type = KVM_CPU_3S_32; 166 } 167 168 kvmppc_sanity_check(vcpu); 169 170 /* If we are in hypervisor level on 970, we can tell the CPU to 171 * treat DCBZ as 32 bytes store */ 172 vcpu->arch.hflags &= ~BOOK3S_HFLAG_DCBZ32; 173 if (vcpu->arch.mmu.is_dcbz32(vcpu) && (mfmsr() & MSR_HV) && 174 !strcmp(cur_cpu_spec->platform, "ppc970")) 175 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32; 176 177 /* Cell performs badly if MSR_FEx are set. So let's hope nobody 178 really needs them in a VM on Cell and force disable them. */ 179 if (!strcmp(cur_cpu_spec->platform, "ppc-cell-be")) 180 to_book3s(vcpu)->msr_mask &= ~(MSR_FE0 | MSR_FE1); 181 182 #ifdef CONFIG_PPC_BOOK3S_32 183 /* 32 bit Book3S always has 32 byte dcbz */ 184 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32; 185 #endif 186 187 /* On some CPUs we can execute paired single operations natively */ 188 asm ( "mfpvr %0" : "=r"(host_pvr)); 189 switch (host_pvr) { 190 case 0x00080200: /* lonestar 2.0 */ 191 case 0x00088202: /* lonestar 2.2 */ 192 case 0x70000100: /* gekko 1.0 */ 193 case 0x00080100: /* gekko 2.0 */ 194 case 0x00083203: /* gekko 2.3a */ 195 case 0x00083213: /* gekko 2.3b */ 196 case 0x00083204: /* gekko 2.4 */ 197 case 0x00083214: /* gekko 2.4e (8SE) - retail HW2 */ 198 case 0x00087200: /* broadway */ 199 vcpu->arch.hflags |= BOOK3S_HFLAG_NATIVE_PS; 200 /* Enable HID2.PSE - in case we need it later */ 201 mtspr(SPRN_HID2_GEKKO, mfspr(SPRN_HID2_GEKKO) | (1 << 29)); 202 } 203 } 204 205 /* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To 206 * make Book3s_32 Linux work on Book3s_64, we have to make sure we trap dcbz to 207 * emulate 32 bytes dcbz length. 208 * 209 * The Book3s_64 inventors also realized this case and implemented a special bit 210 * in the HID5 register, which is a hypervisor ressource. Thus we can't use it. 211 * 212 * My approach here is to patch the dcbz instruction on executing pages. 213 */ 214 static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte) 215 { 216 struct page *hpage; 217 u64 hpage_offset; 218 u32 *page; 219 int i; 220 221 hpage = gfn_to_page(vcpu->kvm, pte->raddr >> PAGE_SHIFT); 222 if (is_error_page(hpage)) { 223 kvm_release_page_clean(hpage); 224 return; 225 } 226 227 hpage_offset = pte->raddr & ~PAGE_MASK; 228 hpage_offset &= ~0xFFFULL; 229 hpage_offset /= 4; 230 231 get_page(hpage); 232 page = kmap_atomic(hpage, KM_USER0); 233 234 /* patch dcbz into reserved instruction, so we trap */ 235 for (i=hpage_offset; i < hpage_offset + (HW_PAGE_SIZE / 4); i++) 236 if ((page[i] & 0xff0007ff) == INS_DCBZ) 237 page[i] &= 0xfffffff7; 238 239 kunmap_atomic(page, KM_USER0); 240 put_page(hpage); 241 } 242 243 static int kvmppc_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) 244 { 245 ulong mp_pa = vcpu->arch.magic_page_pa; 246 247 if (unlikely(mp_pa) && 248 unlikely((mp_pa & KVM_PAM) >> PAGE_SHIFT == gfn)) { 249 return 1; 250 } 251 252 return kvm_is_visible_gfn(vcpu->kvm, gfn); 253 } 254 255 int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu, 256 ulong eaddr, int vec) 257 { 258 bool data = (vec == BOOK3S_INTERRUPT_DATA_STORAGE); 259 int r = RESUME_GUEST; 260 int relocated; 261 int page_found = 0; 262 struct kvmppc_pte pte; 263 bool is_mmio = false; 264 bool dr = (vcpu->arch.shared->msr & MSR_DR) ? true : false; 265 bool ir = (vcpu->arch.shared->msr & MSR_IR) ? true : false; 266 u64 vsid; 267 268 relocated = data ? dr : ir; 269 270 /* Resolve real address if translation turned on */ 271 if (relocated) { 272 page_found = vcpu->arch.mmu.xlate(vcpu, eaddr, &pte, data); 273 } else { 274 pte.may_execute = true; 275 pte.may_read = true; 276 pte.may_write = true; 277 pte.raddr = eaddr & KVM_PAM; 278 pte.eaddr = eaddr; 279 pte.vpage = eaddr >> 12; 280 } 281 282 switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) { 283 case 0: 284 pte.vpage |= ((u64)VSID_REAL << (SID_SHIFT - 12)); 285 break; 286 case MSR_DR: 287 case MSR_IR: 288 vcpu->arch.mmu.esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid); 289 290 if ((vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) == MSR_DR) 291 pte.vpage |= ((u64)VSID_REAL_DR << (SID_SHIFT - 12)); 292 else 293 pte.vpage |= ((u64)VSID_REAL_IR << (SID_SHIFT - 12)); 294 pte.vpage |= vsid; 295 296 if (vsid == -1) 297 page_found = -EINVAL; 298 break; 299 } 300 301 if (vcpu->arch.mmu.is_dcbz32(vcpu) && 302 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) { 303 /* 304 * If we do the dcbz hack, we have to NX on every execution, 305 * so we can patch the executing code. This renders our guest 306 * NX-less. 307 */ 308 pte.may_execute = !data; 309 } 310 311 if (page_found == -ENOENT) { 312 /* Page not found in guest PTE entries */ 313 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu); 314 vcpu->arch.shared->dsisr = to_svcpu(vcpu)->fault_dsisr; 315 vcpu->arch.shared->msr |= 316 (to_svcpu(vcpu)->shadow_srr1 & 0x00000000f8000000ULL); 317 kvmppc_book3s_queue_irqprio(vcpu, vec); 318 } else if (page_found == -EPERM) { 319 /* Storage protection */ 320 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu); 321 vcpu->arch.shared->dsisr = 322 to_svcpu(vcpu)->fault_dsisr & ~DSISR_NOHPTE; 323 vcpu->arch.shared->dsisr |= DSISR_PROTFAULT; 324 vcpu->arch.shared->msr |= 325 (to_svcpu(vcpu)->shadow_srr1 & 0x00000000f8000000ULL); 326 kvmppc_book3s_queue_irqprio(vcpu, vec); 327 } else if (page_found == -EINVAL) { 328 /* Page not found in guest SLB */ 329 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu); 330 kvmppc_book3s_queue_irqprio(vcpu, vec + 0x80); 331 } else if (!is_mmio && 332 kvmppc_visible_gfn(vcpu, pte.raddr >> PAGE_SHIFT)) { 333 /* The guest's PTE is not mapped yet. Map on the host */ 334 kvmppc_mmu_map_page(vcpu, &pte); 335 if (data) 336 vcpu->stat.sp_storage++; 337 else if (vcpu->arch.mmu.is_dcbz32(vcpu) && 338 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) 339 kvmppc_patch_dcbz(vcpu, &pte); 340 } else { 341 /* MMIO */ 342 vcpu->stat.mmio_exits++; 343 vcpu->arch.paddr_accessed = pte.raddr; 344 r = kvmppc_emulate_mmio(run, vcpu); 345 if ( r == RESUME_HOST_NV ) 346 r = RESUME_HOST; 347 } 348 349 return r; 350 } 351 352 static inline int get_fpr_index(int i) 353 { 354 #ifdef CONFIG_VSX 355 i *= 2; 356 #endif 357 return i; 358 } 359 360 /* Give up external provider (FPU, Altivec, VSX) */ 361 void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr) 362 { 363 struct thread_struct *t = ¤t->thread; 364 u64 *vcpu_fpr = vcpu->arch.fpr; 365 #ifdef CONFIG_VSX 366 u64 *vcpu_vsx = vcpu->arch.vsr; 367 #endif 368 u64 *thread_fpr = (u64*)t->fpr; 369 int i; 370 371 if (!(vcpu->arch.guest_owned_ext & msr)) 372 return; 373 374 #ifdef DEBUG_EXT 375 printk(KERN_INFO "Giving up ext 0x%lx\n", msr); 376 #endif 377 378 switch (msr) { 379 case MSR_FP: 380 giveup_fpu(current); 381 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++) 382 vcpu_fpr[i] = thread_fpr[get_fpr_index(i)]; 383 384 vcpu->arch.fpscr = t->fpscr.val; 385 break; 386 case MSR_VEC: 387 #ifdef CONFIG_ALTIVEC 388 giveup_altivec(current); 389 memcpy(vcpu->arch.vr, t->vr, sizeof(vcpu->arch.vr)); 390 vcpu->arch.vscr = t->vscr; 391 #endif 392 break; 393 case MSR_VSX: 394 #ifdef CONFIG_VSX 395 __giveup_vsx(current); 396 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr); i++) 397 vcpu_vsx[i] = thread_fpr[get_fpr_index(i) + 1]; 398 #endif 399 break; 400 default: 401 BUG(); 402 } 403 404 vcpu->arch.guest_owned_ext &= ~msr; 405 current->thread.regs->msr &= ~msr; 406 kvmppc_recalc_shadow_msr(vcpu); 407 } 408 409 static int kvmppc_read_inst(struct kvm_vcpu *vcpu) 410 { 411 ulong srr0 = kvmppc_get_pc(vcpu); 412 u32 last_inst = kvmppc_get_last_inst(vcpu); 413 int ret; 414 415 ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false); 416 if (ret == -ENOENT) { 417 ulong msr = vcpu->arch.shared->msr; 418 419 msr = kvmppc_set_field(msr, 33, 33, 1); 420 msr = kvmppc_set_field(msr, 34, 36, 0); 421 vcpu->arch.shared->msr = kvmppc_set_field(msr, 42, 47, 0); 422 kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_INST_STORAGE); 423 return EMULATE_AGAIN; 424 } 425 426 return EMULATE_DONE; 427 } 428 429 static int kvmppc_check_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr) 430 { 431 432 /* Need to do paired single emulation? */ 433 if (!(vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)) 434 return EMULATE_DONE; 435 436 /* Read out the instruction */ 437 if (kvmppc_read_inst(vcpu) == EMULATE_DONE) 438 /* Need to emulate */ 439 return EMULATE_FAIL; 440 441 return EMULATE_AGAIN; 442 } 443 444 /* Handle external providers (FPU, Altivec, VSX) */ 445 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr, 446 ulong msr) 447 { 448 struct thread_struct *t = ¤t->thread; 449 u64 *vcpu_fpr = vcpu->arch.fpr; 450 #ifdef CONFIG_VSX 451 u64 *vcpu_vsx = vcpu->arch.vsr; 452 #endif 453 u64 *thread_fpr = (u64*)t->fpr; 454 int i; 455 456 /* When we have paired singles, we emulate in software */ 457 if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE) 458 return RESUME_GUEST; 459 460 if (!(vcpu->arch.shared->msr & msr)) { 461 kvmppc_book3s_queue_irqprio(vcpu, exit_nr); 462 return RESUME_GUEST; 463 } 464 465 /* We already own the ext */ 466 if (vcpu->arch.guest_owned_ext & msr) { 467 return RESUME_GUEST; 468 } 469 470 #ifdef DEBUG_EXT 471 printk(KERN_INFO "Loading up ext 0x%lx\n", msr); 472 #endif 473 474 current->thread.regs->msr |= msr; 475 476 switch (msr) { 477 case MSR_FP: 478 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++) 479 thread_fpr[get_fpr_index(i)] = vcpu_fpr[i]; 480 481 t->fpscr.val = vcpu->arch.fpscr; 482 t->fpexc_mode = 0; 483 kvmppc_load_up_fpu(); 484 break; 485 case MSR_VEC: 486 #ifdef CONFIG_ALTIVEC 487 memcpy(t->vr, vcpu->arch.vr, sizeof(vcpu->arch.vr)); 488 t->vscr = vcpu->arch.vscr; 489 t->vrsave = -1; 490 kvmppc_load_up_altivec(); 491 #endif 492 break; 493 case MSR_VSX: 494 #ifdef CONFIG_VSX 495 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr); i++) 496 thread_fpr[get_fpr_index(i) + 1] = vcpu_vsx[i]; 497 kvmppc_load_up_vsx(); 498 #endif 499 break; 500 default: 501 BUG(); 502 } 503 504 vcpu->arch.guest_owned_ext |= msr; 505 506 kvmppc_recalc_shadow_msr(vcpu); 507 508 return RESUME_GUEST; 509 } 510 511 int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu, 512 unsigned int exit_nr) 513 { 514 int r = RESUME_HOST; 515 516 vcpu->stat.sum_exits++; 517 518 run->exit_reason = KVM_EXIT_UNKNOWN; 519 run->ready_for_interrupt_injection = 1; 520 521 trace_kvm_book3s_exit(exit_nr, vcpu); 522 kvm_resched(vcpu); 523 switch (exit_nr) { 524 case BOOK3S_INTERRUPT_INST_STORAGE: 525 vcpu->stat.pf_instruc++; 526 527 #ifdef CONFIG_PPC_BOOK3S_32 528 /* We set segments as unused segments when invalidating them. So 529 * treat the respective fault as segment fault. */ 530 if (to_svcpu(vcpu)->sr[kvmppc_get_pc(vcpu) >> SID_SHIFT] 531 == SR_INVALID) { 532 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)); 533 r = RESUME_GUEST; 534 break; 535 } 536 #endif 537 538 /* only care about PTEG not found errors, but leave NX alone */ 539 if (to_svcpu(vcpu)->shadow_srr1 & 0x40000000) { 540 r = kvmppc_handle_pagefault(run, vcpu, kvmppc_get_pc(vcpu), exit_nr); 541 vcpu->stat.sp_instruc++; 542 } else if (vcpu->arch.mmu.is_dcbz32(vcpu) && 543 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) { 544 /* 545 * XXX If we do the dcbz hack we use the NX bit to flush&patch the page, 546 * so we can't use the NX bit inside the guest. Let's cross our fingers, 547 * that no guest that needs the dcbz hack does NX. 548 */ 549 kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL); 550 r = RESUME_GUEST; 551 } else { 552 vcpu->arch.shared->msr |= 553 to_svcpu(vcpu)->shadow_srr1 & 0x58000000; 554 kvmppc_book3s_queue_irqprio(vcpu, exit_nr); 555 r = RESUME_GUEST; 556 } 557 break; 558 case BOOK3S_INTERRUPT_DATA_STORAGE: 559 { 560 ulong dar = kvmppc_get_fault_dar(vcpu); 561 vcpu->stat.pf_storage++; 562 563 #ifdef CONFIG_PPC_BOOK3S_32 564 /* We set segments as unused segments when invalidating them. So 565 * treat the respective fault as segment fault. */ 566 if ((to_svcpu(vcpu)->sr[dar >> SID_SHIFT]) == SR_INVALID) { 567 kvmppc_mmu_map_segment(vcpu, dar); 568 r = RESUME_GUEST; 569 break; 570 } 571 #endif 572 573 /* The only case we need to handle is missing shadow PTEs */ 574 if (to_svcpu(vcpu)->fault_dsisr & DSISR_NOHPTE) { 575 r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr); 576 } else { 577 vcpu->arch.shared->dar = dar; 578 vcpu->arch.shared->dsisr = to_svcpu(vcpu)->fault_dsisr; 579 kvmppc_book3s_queue_irqprio(vcpu, exit_nr); 580 r = RESUME_GUEST; 581 } 582 break; 583 } 584 case BOOK3S_INTERRUPT_DATA_SEGMENT: 585 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_fault_dar(vcpu)) < 0) { 586 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu); 587 kvmppc_book3s_queue_irqprio(vcpu, 588 BOOK3S_INTERRUPT_DATA_SEGMENT); 589 } 590 r = RESUME_GUEST; 591 break; 592 case BOOK3S_INTERRUPT_INST_SEGMENT: 593 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)) < 0) { 594 kvmppc_book3s_queue_irqprio(vcpu, 595 BOOK3S_INTERRUPT_INST_SEGMENT); 596 } 597 r = RESUME_GUEST; 598 break; 599 /* We're good on these - the host merely wanted to get our attention */ 600 case BOOK3S_INTERRUPT_DECREMENTER: 601 vcpu->stat.dec_exits++; 602 r = RESUME_GUEST; 603 break; 604 case BOOK3S_INTERRUPT_EXTERNAL: 605 vcpu->stat.ext_intr_exits++; 606 r = RESUME_GUEST; 607 break; 608 case BOOK3S_INTERRUPT_PERFMON: 609 r = RESUME_GUEST; 610 break; 611 case BOOK3S_INTERRUPT_PROGRAM: 612 { 613 enum emulation_result er; 614 ulong flags; 615 616 program_interrupt: 617 flags = to_svcpu(vcpu)->shadow_srr1 & 0x1f0000ull; 618 619 if (vcpu->arch.shared->msr & MSR_PR) { 620 #ifdef EXIT_DEBUG 621 printk(KERN_INFO "Userspace triggered 0x700 exception at 0x%lx (0x%x)\n", kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu)); 622 #endif 623 if ((kvmppc_get_last_inst(vcpu) & 0xff0007ff) != 624 (INS_DCBZ & 0xfffffff7)) { 625 kvmppc_core_queue_program(vcpu, flags); 626 r = RESUME_GUEST; 627 break; 628 } 629 } 630 631 vcpu->stat.emulated_inst_exits++; 632 er = kvmppc_emulate_instruction(run, vcpu); 633 switch (er) { 634 case EMULATE_DONE: 635 r = RESUME_GUEST_NV; 636 break; 637 case EMULATE_AGAIN: 638 r = RESUME_GUEST; 639 break; 640 case EMULATE_FAIL: 641 printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n", 642 __func__, kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu)); 643 kvmppc_core_queue_program(vcpu, flags); 644 r = RESUME_GUEST; 645 break; 646 case EMULATE_DO_MMIO: 647 run->exit_reason = KVM_EXIT_MMIO; 648 r = RESUME_HOST_NV; 649 break; 650 default: 651 BUG(); 652 } 653 break; 654 } 655 case BOOK3S_INTERRUPT_SYSCALL: 656 if (vcpu->arch.papr_enabled && 657 (kvmppc_get_last_inst(vcpu) == 0x44000022) && 658 !(vcpu->arch.shared->msr & MSR_PR)) { 659 /* SC 1 papr hypercalls */ 660 ulong cmd = kvmppc_get_gpr(vcpu, 3); 661 int i; 662 663 if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE) { 664 r = RESUME_GUEST; 665 break; 666 } 667 668 run->papr_hcall.nr = cmd; 669 for (i = 0; i < 9; ++i) { 670 ulong gpr = kvmppc_get_gpr(vcpu, 4 + i); 671 run->papr_hcall.args[i] = gpr; 672 } 673 run->exit_reason = KVM_EXIT_PAPR_HCALL; 674 vcpu->arch.hcall_needed = 1; 675 r = RESUME_HOST; 676 } else if (vcpu->arch.osi_enabled && 677 (((u32)kvmppc_get_gpr(vcpu, 3)) == OSI_SC_MAGIC_R3) && 678 (((u32)kvmppc_get_gpr(vcpu, 4)) == OSI_SC_MAGIC_R4)) { 679 /* MOL hypercalls */ 680 u64 *gprs = run->osi.gprs; 681 int i; 682 683 run->exit_reason = KVM_EXIT_OSI; 684 for (i = 0; i < 32; i++) 685 gprs[i] = kvmppc_get_gpr(vcpu, i); 686 vcpu->arch.osi_needed = 1; 687 r = RESUME_HOST_NV; 688 } else if (!(vcpu->arch.shared->msr & MSR_PR) && 689 (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) { 690 /* KVM PV hypercalls */ 691 kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu)); 692 r = RESUME_GUEST; 693 } else { 694 /* Guest syscalls */ 695 vcpu->stat.syscall_exits++; 696 kvmppc_book3s_queue_irqprio(vcpu, exit_nr); 697 r = RESUME_GUEST; 698 } 699 break; 700 case BOOK3S_INTERRUPT_FP_UNAVAIL: 701 case BOOK3S_INTERRUPT_ALTIVEC: 702 case BOOK3S_INTERRUPT_VSX: 703 { 704 int ext_msr = 0; 705 706 switch (exit_nr) { 707 case BOOK3S_INTERRUPT_FP_UNAVAIL: ext_msr = MSR_FP; break; 708 case BOOK3S_INTERRUPT_ALTIVEC: ext_msr = MSR_VEC; break; 709 case BOOK3S_INTERRUPT_VSX: ext_msr = MSR_VSX; break; 710 } 711 712 switch (kvmppc_check_ext(vcpu, exit_nr)) { 713 case EMULATE_DONE: 714 /* everything ok - let's enable the ext */ 715 r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr); 716 break; 717 case EMULATE_FAIL: 718 /* we need to emulate this instruction */ 719 goto program_interrupt; 720 break; 721 default: 722 /* nothing to worry about - go again */ 723 break; 724 } 725 break; 726 } 727 case BOOK3S_INTERRUPT_ALIGNMENT: 728 if (kvmppc_read_inst(vcpu) == EMULATE_DONE) { 729 vcpu->arch.shared->dsisr = kvmppc_alignment_dsisr(vcpu, 730 kvmppc_get_last_inst(vcpu)); 731 vcpu->arch.shared->dar = kvmppc_alignment_dar(vcpu, 732 kvmppc_get_last_inst(vcpu)); 733 kvmppc_book3s_queue_irqprio(vcpu, exit_nr); 734 } 735 r = RESUME_GUEST; 736 break; 737 case BOOK3S_INTERRUPT_MACHINE_CHECK: 738 case BOOK3S_INTERRUPT_TRACE: 739 kvmppc_book3s_queue_irqprio(vcpu, exit_nr); 740 r = RESUME_GUEST; 741 break; 742 default: 743 /* Ugh - bork here! What did we get? */ 744 printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | msr=0x%lx\n", 745 exit_nr, kvmppc_get_pc(vcpu), to_svcpu(vcpu)->shadow_srr1); 746 r = RESUME_HOST; 747 BUG(); 748 break; 749 } 750 751 752 if (!(r & RESUME_HOST)) { 753 /* To avoid clobbering exit_reason, only check for signals if 754 * we aren't already exiting to userspace for some other 755 * reason. */ 756 if (signal_pending(current)) { 757 #ifdef EXIT_DEBUG 758 printk(KERN_EMERG "KVM: Going back to host\n"); 759 #endif 760 vcpu->stat.signal_exits++; 761 run->exit_reason = KVM_EXIT_INTR; 762 r = -EINTR; 763 } else { 764 /* In case an interrupt came in that was triggered 765 * from userspace (like DEC), we need to check what 766 * to inject now! */ 767 kvmppc_core_deliver_interrupts(vcpu); 768 } 769 } 770 771 trace_kvm_book3s_reenter(r, vcpu); 772 773 return r; 774 } 775 776 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, 777 struct kvm_sregs *sregs) 778 { 779 struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu); 780 int i; 781 782 sregs->pvr = vcpu->arch.pvr; 783 784 sregs->u.s.sdr1 = to_book3s(vcpu)->sdr1; 785 if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) { 786 for (i = 0; i < 64; i++) { 787 sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige | i; 788 sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv; 789 } 790 } else { 791 for (i = 0; i < 16; i++) 792 sregs->u.s.ppc32.sr[i] = vcpu->arch.shared->sr[i]; 793 794 for (i = 0; i < 8; i++) { 795 sregs->u.s.ppc32.ibat[i] = vcpu3s->ibat[i].raw; 796 sregs->u.s.ppc32.dbat[i] = vcpu3s->dbat[i].raw; 797 } 798 } 799 800 if (sregs->u.s.flags & KVM_SREGS_S_HIOR) 801 sregs->u.s.hior = to_book3s(vcpu)->hior; 802 803 return 0; 804 } 805 806 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, 807 struct kvm_sregs *sregs) 808 { 809 struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu); 810 int i; 811 812 kvmppc_set_pvr(vcpu, sregs->pvr); 813 814 vcpu3s->sdr1 = sregs->u.s.sdr1; 815 if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) { 816 for (i = 0; i < 64; i++) { 817 vcpu->arch.mmu.slbmte(vcpu, sregs->u.s.ppc64.slb[i].slbv, 818 sregs->u.s.ppc64.slb[i].slbe); 819 } 820 } else { 821 for (i = 0; i < 16; i++) { 822 vcpu->arch.mmu.mtsrin(vcpu, i, sregs->u.s.ppc32.sr[i]); 823 } 824 for (i = 0; i < 8; i++) { 825 kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), false, 826 (u32)sregs->u.s.ppc32.ibat[i]); 827 kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), true, 828 (u32)(sregs->u.s.ppc32.ibat[i] >> 32)); 829 kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), false, 830 (u32)sregs->u.s.ppc32.dbat[i]); 831 kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), true, 832 (u32)(sregs->u.s.ppc32.dbat[i] >> 32)); 833 } 834 } 835 836 /* Flush the MMU after messing with the segments */ 837 kvmppc_mmu_pte_flush(vcpu, 0, 0); 838 839 if (sregs->u.s.flags & KVM_SREGS_S_HIOR) { 840 to_book3s(vcpu)->hior_sregs = true; 841 to_book3s(vcpu)->hior = sregs->u.s.hior; 842 } 843 844 return 0; 845 } 846 847 int kvmppc_core_check_processor_compat(void) 848 { 849 return 0; 850 } 851 852 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id) 853 { 854 struct kvmppc_vcpu_book3s *vcpu_book3s; 855 struct kvm_vcpu *vcpu; 856 int err = -ENOMEM; 857 unsigned long p; 858 859 vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s)); 860 if (!vcpu_book3s) 861 goto out; 862 863 vcpu_book3s->shadow_vcpu = (struct kvmppc_book3s_shadow_vcpu *) 864 kzalloc(sizeof(*vcpu_book3s->shadow_vcpu), GFP_KERNEL); 865 if (!vcpu_book3s->shadow_vcpu) 866 goto free_vcpu; 867 868 vcpu = &vcpu_book3s->vcpu; 869 err = kvm_vcpu_init(vcpu, kvm, id); 870 if (err) 871 goto free_shadow_vcpu; 872 873 p = __get_free_page(GFP_KERNEL|__GFP_ZERO); 874 /* the real shared page fills the last 4k of our page */ 875 vcpu->arch.shared = (void*)(p + PAGE_SIZE - 4096); 876 if (!p) 877 goto uninit_vcpu; 878 879 #ifdef CONFIG_PPC_BOOK3S_64 880 /* default to book3s_64 (970fx) */ 881 vcpu->arch.pvr = 0x3C0301; 882 #else 883 /* default to book3s_32 (750) */ 884 vcpu->arch.pvr = 0x84202; 885 #endif 886 kvmppc_set_pvr(vcpu, vcpu->arch.pvr); 887 vcpu->arch.slb_nr = 64; 888 889 vcpu->arch.shadow_msr = MSR_USER64; 890 891 err = kvmppc_mmu_init(vcpu); 892 if (err < 0) 893 goto uninit_vcpu; 894 895 return vcpu; 896 897 uninit_vcpu: 898 kvm_vcpu_uninit(vcpu); 899 free_shadow_vcpu: 900 kfree(vcpu_book3s->shadow_vcpu); 901 free_vcpu: 902 vfree(vcpu_book3s); 903 out: 904 return ERR_PTR(err); 905 } 906 907 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu) 908 { 909 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); 910 911 free_page((unsigned long)vcpu->arch.shared & PAGE_MASK); 912 kvm_vcpu_uninit(vcpu); 913 kfree(vcpu_book3s->shadow_vcpu); 914 vfree(vcpu_book3s); 915 } 916 917 int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) 918 { 919 int ret; 920 double fpr[32][TS_FPRWIDTH]; 921 unsigned int fpscr; 922 int fpexc_mode; 923 #ifdef CONFIG_ALTIVEC 924 vector128 vr[32]; 925 vector128 vscr; 926 unsigned long uninitialized_var(vrsave); 927 int used_vr; 928 #endif 929 #ifdef CONFIG_VSX 930 int used_vsr; 931 #endif 932 ulong ext_msr; 933 934 /* Check if we can run the vcpu at all */ 935 if (!vcpu->arch.sane) { 936 kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 937 return -EINVAL; 938 } 939 940 /* No need to go into the guest when all we do is going out */ 941 if (signal_pending(current)) { 942 kvm_run->exit_reason = KVM_EXIT_INTR; 943 return -EINTR; 944 } 945 946 /* Save FPU state in stack */ 947 if (current->thread.regs->msr & MSR_FP) 948 giveup_fpu(current); 949 memcpy(fpr, current->thread.fpr, sizeof(current->thread.fpr)); 950 fpscr = current->thread.fpscr.val; 951 fpexc_mode = current->thread.fpexc_mode; 952 953 #ifdef CONFIG_ALTIVEC 954 /* Save Altivec state in stack */ 955 used_vr = current->thread.used_vr; 956 if (used_vr) { 957 if (current->thread.regs->msr & MSR_VEC) 958 giveup_altivec(current); 959 memcpy(vr, current->thread.vr, sizeof(current->thread.vr)); 960 vscr = current->thread.vscr; 961 vrsave = current->thread.vrsave; 962 } 963 #endif 964 965 #ifdef CONFIG_VSX 966 /* Save VSX state in stack */ 967 used_vsr = current->thread.used_vsr; 968 if (used_vsr && (current->thread.regs->msr & MSR_VSX)) 969 __giveup_vsx(current); 970 #endif 971 972 /* Remember the MSR with disabled extensions */ 973 ext_msr = current->thread.regs->msr; 974 975 /* Preload FPU if it's enabled */ 976 if (vcpu->arch.shared->msr & MSR_FP) 977 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP); 978 979 kvm_guest_enter(); 980 981 ret = __kvmppc_vcpu_run(kvm_run, vcpu); 982 983 kvm_guest_exit(); 984 985 local_irq_disable(); 986 987 current->thread.regs->msr = ext_msr; 988 989 /* Make sure we save the guest FPU/Altivec/VSX state */ 990 kvmppc_giveup_ext(vcpu, MSR_FP); 991 kvmppc_giveup_ext(vcpu, MSR_VEC); 992 kvmppc_giveup_ext(vcpu, MSR_VSX); 993 994 /* Restore FPU state from stack */ 995 memcpy(current->thread.fpr, fpr, sizeof(current->thread.fpr)); 996 current->thread.fpscr.val = fpscr; 997 current->thread.fpexc_mode = fpexc_mode; 998 999 #ifdef CONFIG_ALTIVEC 1000 /* Restore Altivec state from stack */ 1001 if (used_vr && current->thread.used_vr) { 1002 memcpy(current->thread.vr, vr, sizeof(current->thread.vr)); 1003 current->thread.vscr = vscr; 1004 current->thread.vrsave = vrsave; 1005 } 1006 current->thread.used_vr = used_vr; 1007 #endif 1008 1009 #ifdef CONFIG_VSX 1010 current->thread.used_vsr = used_vsr; 1011 #endif 1012 1013 return ret; 1014 } 1015 1016 int kvmppc_core_prepare_memory_region(struct kvm *kvm, 1017 struct kvm_userspace_memory_region *mem) 1018 { 1019 return 0; 1020 } 1021 1022 void kvmppc_core_commit_memory_region(struct kvm *kvm, 1023 struct kvm_userspace_memory_region *mem) 1024 { 1025 } 1026 1027 int kvmppc_core_init_vm(struct kvm *kvm) 1028 { 1029 return 0; 1030 } 1031 1032 void kvmppc_core_destroy_vm(struct kvm *kvm) 1033 { 1034 } 1035 1036 static int kvmppc_book3s_init(void) 1037 { 1038 int r; 1039 1040 r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_book3s), 0, 1041 THIS_MODULE); 1042 1043 if (r) 1044 return r; 1045 1046 r = kvmppc_mmu_hpte_sysinit(); 1047 1048 return r; 1049 } 1050 1051 static void kvmppc_book3s_exit(void) 1052 { 1053 kvmppc_mmu_hpte_sysexit(); 1054 kvm_exit(); 1055 } 1056 1057 module_init(kvmppc_book3s_init); 1058 module_exit(kvmppc_book3s_exit); 1059