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 to_book3s(vcpu)->hior = 0xfff00000; 155 to_book3s(vcpu)->msr_mask = 0xffffffffffffffffULL; 156 vcpu->arch.cpu_type = KVM_CPU_3S_64; 157 } else 158 #endif 159 { 160 kvmppc_mmu_book3s_32_init(vcpu); 161 to_book3s(vcpu)->hior = 0; 162 to_book3s(vcpu)->msr_mask = 0xffffffffULL; 163 vcpu->arch.cpu_type = KVM_CPU_3S_32; 164 } 165 166 kvmppc_sanity_check(vcpu); 167 168 /* If we are in hypervisor level on 970, we can tell the CPU to 169 * treat DCBZ as 32 bytes store */ 170 vcpu->arch.hflags &= ~BOOK3S_HFLAG_DCBZ32; 171 if (vcpu->arch.mmu.is_dcbz32(vcpu) && (mfmsr() & MSR_HV) && 172 !strcmp(cur_cpu_spec->platform, "ppc970")) 173 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32; 174 175 /* Cell performs badly if MSR_FEx are set. So let's hope nobody 176 really needs them in a VM on Cell and force disable them. */ 177 if (!strcmp(cur_cpu_spec->platform, "ppc-cell-be")) 178 to_book3s(vcpu)->msr_mask &= ~(MSR_FE0 | MSR_FE1); 179 180 #ifdef CONFIG_PPC_BOOK3S_32 181 /* 32 bit Book3S always has 32 byte dcbz */ 182 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32; 183 #endif 184 185 /* On some CPUs we can execute paired single operations natively */ 186 asm ( "mfpvr %0" : "=r"(host_pvr)); 187 switch (host_pvr) { 188 case 0x00080200: /* lonestar 2.0 */ 189 case 0x00088202: /* lonestar 2.2 */ 190 case 0x70000100: /* gekko 1.0 */ 191 case 0x00080100: /* gekko 2.0 */ 192 case 0x00083203: /* gekko 2.3a */ 193 case 0x00083213: /* gekko 2.3b */ 194 case 0x00083204: /* gekko 2.4 */ 195 case 0x00083214: /* gekko 2.4e (8SE) - retail HW2 */ 196 case 0x00087200: /* broadway */ 197 vcpu->arch.hflags |= BOOK3S_HFLAG_NATIVE_PS; 198 /* Enable HID2.PSE - in case we need it later */ 199 mtspr(SPRN_HID2_GEKKO, mfspr(SPRN_HID2_GEKKO) | (1 << 29)); 200 } 201 } 202 203 /* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To 204 * make Book3s_32 Linux work on Book3s_64, we have to make sure we trap dcbz to 205 * emulate 32 bytes dcbz length. 206 * 207 * The Book3s_64 inventors also realized this case and implemented a special bit 208 * in the HID5 register, which is a hypervisor ressource. Thus we can't use it. 209 * 210 * My approach here is to patch the dcbz instruction on executing pages. 211 */ 212 static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte) 213 { 214 struct page *hpage; 215 u64 hpage_offset; 216 u32 *page; 217 int i; 218 219 hpage = gfn_to_page(vcpu->kvm, pte->raddr >> PAGE_SHIFT); 220 if (is_error_page(hpage)) { 221 kvm_release_page_clean(hpage); 222 return; 223 } 224 225 hpage_offset = pte->raddr & ~PAGE_MASK; 226 hpage_offset &= ~0xFFFULL; 227 hpage_offset /= 4; 228 229 get_page(hpage); 230 page = kmap_atomic(hpage, KM_USER0); 231 232 /* patch dcbz into reserved instruction, so we trap */ 233 for (i=hpage_offset; i < hpage_offset + (HW_PAGE_SIZE / 4); i++) 234 if ((page[i] & 0xff0007ff) == INS_DCBZ) 235 page[i] &= 0xfffffff7; 236 237 kunmap_atomic(page, KM_USER0); 238 put_page(hpage); 239 } 240 241 static int kvmppc_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) 242 { 243 ulong mp_pa = vcpu->arch.magic_page_pa; 244 245 if (unlikely(mp_pa) && 246 unlikely((mp_pa & KVM_PAM) >> PAGE_SHIFT == gfn)) { 247 return 1; 248 } 249 250 return kvm_is_visible_gfn(vcpu->kvm, gfn); 251 } 252 253 int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu, 254 ulong eaddr, int vec) 255 { 256 bool data = (vec == BOOK3S_INTERRUPT_DATA_STORAGE); 257 int r = RESUME_GUEST; 258 int relocated; 259 int page_found = 0; 260 struct kvmppc_pte pte; 261 bool is_mmio = false; 262 bool dr = (vcpu->arch.shared->msr & MSR_DR) ? true : false; 263 bool ir = (vcpu->arch.shared->msr & MSR_IR) ? true : false; 264 u64 vsid; 265 266 relocated = data ? dr : ir; 267 268 /* Resolve real address if translation turned on */ 269 if (relocated) { 270 page_found = vcpu->arch.mmu.xlate(vcpu, eaddr, &pte, data); 271 } else { 272 pte.may_execute = true; 273 pte.may_read = true; 274 pte.may_write = true; 275 pte.raddr = eaddr & KVM_PAM; 276 pte.eaddr = eaddr; 277 pte.vpage = eaddr >> 12; 278 } 279 280 switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) { 281 case 0: 282 pte.vpage |= ((u64)VSID_REAL << (SID_SHIFT - 12)); 283 break; 284 case MSR_DR: 285 case MSR_IR: 286 vcpu->arch.mmu.esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid); 287 288 if ((vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) == MSR_DR) 289 pte.vpage |= ((u64)VSID_REAL_DR << (SID_SHIFT - 12)); 290 else 291 pte.vpage |= ((u64)VSID_REAL_IR << (SID_SHIFT - 12)); 292 pte.vpage |= vsid; 293 294 if (vsid == -1) 295 page_found = -EINVAL; 296 break; 297 } 298 299 if (vcpu->arch.mmu.is_dcbz32(vcpu) && 300 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) { 301 /* 302 * If we do the dcbz hack, we have to NX on every execution, 303 * so we can patch the executing code. This renders our guest 304 * NX-less. 305 */ 306 pte.may_execute = !data; 307 } 308 309 if (page_found == -ENOENT) { 310 /* Page not found in guest PTE entries */ 311 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu); 312 vcpu->arch.shared->dsisr = to_svcpu(vcpu)->fault_dsisr; 313 vcpu->arch.shared->msr |= 314 (to_svcpu(vcpu)->shadow_srr1 & 0x00000000f8000000ULL); 315 kvmppc_book3s_queue_irqprio(vcpu, vec); 316 } else if (page_found == -EPERM) { 317 /* Storage protection */ 318 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu); 319 vcpu->arch.shared->dsisr = 320 to_svcpu(vcpu)->fault_dsisr & ~DSISR_NOHPTE; 321 vcpu->arch.shared->dsisr |= DSISR_PROTFAULT; 322 vcpu->arch.shared->msr |= 323 (to_svcpu(vcpu)->shadow_srr1 & 0x00000000f8000000ULL); 324 kvmppc_book3s_queue_irqprio(vcpu, vec); 325 } else if (page_found == -EINVAL) { 326 /* Page not found in guest SLB */ 327 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu); 328 kvmppc_book3s_queue_irqprio(vcpu, vec + 0x80); 329 } else if (!is_mmio && 330 kvmppc_visible_gfn(vcpu, pte.raddr >> PAGE_SHIFT)) { 331 /* The guest's PTE is not mapped yet. Map on the host */ 332 kvmppc_mmu_map_page(vcpu, &pte); 333 if (data) 334 vcpu->stat.sp_storage++; 335 else if (vcpu->arch.mmu.is_dcbz32(vcpu) && 336 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) 337 kvmppc_patch_dcbz(vcpu, &pte); 338 } else { 339 /* MMIO */ 340 vcpu->stat.mmio_exits++; 341 vcpu->arch.paddr_accessed = pte.raddr; 342 r = kvmppc_emulate_mmio(run, vcpu); 343 if ( r == RESUME_HOST_NV ) 344 r = RESUME_HOST; 345 } 346 347 return r; 348 } 349 350 static inline int get_fpr_index(int i) 351 { 352 #ifdef CONFIG_VSX 353 i *= 2; 354 #endif 355 return i; 356 } 357 358 /* Give up external provider (FPU, Altivec, VSX) */ 359 void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr) 360 { 361 struct thread_struct *t = ¤t->thread; 362 u64 *vcpu_fpr = vcpu->arch.fpr; 363 #ifdef CONFIG_VSX 364 u64 *vcpu_vsx = vcpu->arch.vsr; 365 #endif 366 u64 *thread_fpr = (u64*)t->fpr; 367 int i; 368 369 if (!(vcpu->arch.guest_owned_ext & msr)) 370 return; 371 372 #ifdef DEBUG_EXT 373 printk(KERN_INFO "Giving up ext 0x%lx\n", msr); 374 #endif 375 376 switch (msr) { 377 case MSR_FP: 378 giveup_fpu(current); 379 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++) 380 vcpu_fpr[i] = thread_fpr[get_fpr_index(i)]; 381 382 vcpu->arch.fpscr = t->fpscr.val; 383 break; 384 case MSR_VEC: 385 #ifdef CONFIG_ALTIVEC 386 giveup_altivec(current); 387 memcpy(vcpu->arch.vr, t->vr, sizeof(vcpu->arch.vr)); 388 vcpu->arch.vscr = t->vscr; 389 #endif 390 break; 391 case MSR_VSX: 392 #ifdef CONFIG_VSX 393 __giveup_vsx(current); 394 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr); i++) 395 vcpu_vsx[i] = thread_fpr[get_fpr_index(i) + 1]; 396 #endif 397 break; 398 default: 399 BUG(); 400 } 401 402 vcpu->arch.guest_owned_ext &= ~msr; 403 current->thread.regs->msr &= ~msr; 404 kvmppc_recalc_shadow_msr(vcpu); 405 } 406 407 static int kvmppc_read_inst(struct kvm_vcpu *vcpu) 408 { 409 ulong srr0 = kvmppc_get_pc(vcpu); 410 u32 last_inst = kvmppc_get_last_inst(vcpu); 411 int ret; 412 413 ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false); 414 if (ret == -ENOENT) { 415 ulong msr = vcpu->arch.shared->msr; 416 417 msr = kvmppc_set_field(msr, 33, 33, 1); 418 msr = kvmppc_set_field(msr, 34, 36, 0); 419 vcpu->arch.shared->msr = kvmppc_set_field(msr, 42, 47, 0); 420 kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_INST_STORAGE); 421 return EMULATE_AGAIN; 422 } 423 424 return EMULATE_DONE; 425 } 426 427 static int kvmppc_check_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr) 428 { 429 430 /* Need to do paired single emulation? */ 431 if (!(vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)) 432 return EMULATE_DONE; 433 434 /* Read out the instruction */ 435 if (kvmppc_read_inst(vcpu) == EMULATE_DONE) 436 /* Need to emulate */ 437 return EMULATE_FAIL; 438 439 return EMULATE_AGAIN; 440 } 441 442 /* Handle external providers (FPU, Altivec, VSX) */ 443 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr, 444 ulong msr) 445 { 446 struct thread_struct *t = ¤t->thread; 447 u64 *vcpu_fpr = vcpu->arch.fpr; 448 #ifdef CONFIG_VSX 449 u64 *vcpu_vsx = vcpu->arch.vsr; 450 #endif 451 u64 *thread_fpr = (u64*)t->fpr; 452 int i; 453 454 /* When we have paired singles, we emulate in software */ 455 if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE) 456 return RESUME_GUEST; 457 458 if (!(vcpu->arch.shared->msr & msr)) { 459 kvmppc_book3s_queue_irqprio(vcpu, exit_nr); 460 return RESUME_GUEST; 461 } 462 463 /* We already own the ext */ 464 if (vcpu->arch.guest_owned_ext & msr) { 465 return RESUME_GUEST; 466 } 467 468 #ifdef DEBUG_EXT 469 printk(KERN_INFO "Loading up ext 0x%lx\n", msr); 470 #endif 471 472 current->thread.regs->msr |= msr; 473 474 switch (msr) { 475 case MSR_FP: 476 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++) 477 thread_fpr[get_fpr_index(i)] = vcpu_fpr[i]; 478 479 t->fpscr.val = vcpu->arch.fpscr; 480 t->fpexc_mode = 0; 481 kvmppc_load_up_fpu(); 482 break; 483 case MSR_VEC: 484 #ifdef CONFIG_ALTIVEC 485 memcpy(t->vr, vcpu->arch.vr, sizeof(vcpu->arch.vr)); 486 t->vscr = vcpu->arch.vscr; 487 t->vrsave = -1; 488 kvmppc_load_up_altivec(); 489 #endif 490 break; 491 case MSR_VSX: 492 #ifdef CONFIG_VSX 493 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr); i++) 494 thread_fpr[get_fpr_index(i) + 1] = vcpu_vsx[i]; 495 kvmppc_load_up_vsx(); 496 #endif 497 break; 498 default: 499 BUG(); 500 } 501 502 vcpu->arch.guest_owned_ext |= msr; 503 504 kvmppc_recalc_shadow_msr(vcpu); 505 506 return RESUME_GUEST; 507 } 508 509 int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu, 510 unsigned int exit_nr) 511 { 512 int r = RESUME_HOST; 513 514 vcpu->stat.sum_exits++; 515 516 run->exit_reason = KVM_EXIT_UNKNOWN; 517 run->ready_for_interrupt_injection = 1; 518 519 trace_kvm_book3s_exit(exit_nr, vcpu); 520 kvm_resched(vcpu); 521 switch (exit_nr) { 522 case BOOK3S_INTERRUPT_INST_STORAGE: 523 vcpu->stat.pf_instruc++; 524 525 #ifdef CONFIG_PPC_BOOK3S_32 526 /* We set segments as unused segments when invalidating them. So 527 * treat the respective fault as segment fault. */ 528 if (to_svcpu(vcpu)->sr[kvmppc_get_pc(vcpu) >> SID_SHIFT] 529 == SR_INVALID) { 530 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)); 531 r = RESUME_GUEST; 532 break; 533 } 534 #endif 535 536 /* only care about PTEG not found errors, but leave NX alone */ 537 if (to_svcpu(vcpu)->shadow_srr1 & 0x40000000) { 538 r = kvmppc_handle_pagefault(run, vcpu, kvmppc_get_pc(vcpu), exit_nr); 539 vcpu->stat.sp_instruc++; 540 } else if (vcpu->arch.mmu.is_dcbz32(vcpu) && 541 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) { 542 /* 543 * XXX If we do the dcbz hack we use the NX bit to flush&patch the page, 544 * so we can't use the NX bit inside the guest. Let's cross our fingers, 545 * that no guest that needs the dcbz hack does NX. 546 */ 547 kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL); 548 r = RESUME_GUEST; 549 } else { 550 vcpu->arch.shared->msr |= 551 to_svcpu(vcpu)->shadow_srr1 & 0x58000000; 552 kvmppc_book3s_queue_irqprio(vcpu, exit_nr); 553 r = RESUME_GUEST; 554 } 555 break; 556 case BOOK3S_INTERRUPT_DATA_STORAGE: 557 { 558 ulong dar = kvmppc_get_fault_dar(vcpu); 559 vcpu->stat.pf_storage++; 560 561 #ifdef CONFIG_PPC_BOOK3S_32 562 /* We set segments as unused segments when invalidating them. So 563 * treat the respective fault as segment fault. */ 564 if ((to_svcpu(vcpu)->sr[dar >> SID_SHIFT]) == SR_INVALID) { 565 kvmppc_mmu_map_segment(vcpu, dar); 566 r = RESUME_GUEST; 567 break; 568 } 569 #endif 570 571 /* The only case we need to handle is missing shadow PTEs */ 572 if (to_svcpu(vcpu)->fault_dsisr & DSISR_NOHPTE) { 573 r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr); 574 } else { 575 vcpu->arch.shared->dar = dar; 576 vcpu->arch.shared->dsisr = to_svcpu(vcpu)->fault_dsisr; 577 kvmppc_book3s_queue_irqprio(vcpu, exit_nr); 578 r = RESUME_GUEST; 579 } 580 break; 581 } 582 case BOOK3S_INTERRUPT_DATA_SEGMENT: 583 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_fault_dar(vcpu)) < 0) { 584 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu); 585 kvmppc_book3s_queue_irqprio(vcpu, 586 BOOK3S_INTERRUPT_DATA_SEGMENT); 587 } 588 r = RESUME_GUEST; 589 break; 590 case BOOK3S_INTERRUPT_INST_SEGMENT: 591 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)) < 0) { 592 kvmppc_book3s_queue_irqprio(vcpu, 593 BOOK3S_INTERRUPT_INST_SEGMENT); 594 } 595 r = RESUME_GUEST; 596 break; 597 /* We're good on these - the host merely wanted to get our attention */ 598 case BOOK3S_INTERRUPT_DECREMENTER: 599 vcpu->stat.dec_exits++; 600 r = RESUME_GUEST; 601 break; 602 case BOOK3S_INTERRUPT_EXTERNAL: 603 vcpu->stat.ext_intr_exits++; 604 r = RESUME_GUEST; 605 break; 606 case BOOK3S_INTERRUPT_PERFMON: 607 r = RESUME_GUEST; 608 break; 609 case BOOK3S_INTERRUPT_PROGRAM: 610 { 611 enum emulation_result er; 612 ulong flags; 613 614 program_interrupt: 615 flags = to_svcpu(vcpu)->shadow_srr1 & 0x1f0000ull; 616 617 if (vcpu->arch.shared->msr & MSR_PR) { 618 #ifdef EXIT_DEBUG 619 printk(KERN_INFO "Userspace triggered 0x700 exception at 0x%lx (0x%x)\n", kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu)); 620 #endif 621 if ((kvmppc_get_last_inst(vcpu) & 0xff0007ff) != 622 (INS_DCBZ & 0xfffffff7)) { 623 kvmppc_core_queue_program(vcpu, flags); 624 r = RESUME_GUEST; 625 break; 626 } 627 } 628 629 vcpu->stat.emulated_inst_exits++; 630 er = kvmppc_emulate_instruction(run, vcpu); 631 switch (er) { 632 case EMULATE_DONE: 633 r = RESUME_GUEST_NV; 634 break; 635 case EMULATE_AGAIN: 636 r = RESUME_GUEST; 637 break; 638 case EMULATE_FAIL: 639 printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n", 640 __func__, kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu)); 641 kvmppc_core_queue_program(vcpu, flags); 642 r = RESUME_GUEST; 643 break; 644 case EMULATE_DO_MMIO: 645 run->exit_reason = KVM_EXIT_MMIO; 646 r = RESUME_HOST_NV; 647 break; 648 default: 649 BUG(); 650 } 651 break; 652 } 653 case BOOK3S_INTERRUPT_SYSCALL: 654 if (vcpu->arch.papr_enabled && 655 (kvmppc_get_last_inst(vcpu) == 0x44000022) && 656 !(vcpu->arch.shared->msr & MSR_PR)) { 657 /* SC 1 papr hypercalls */ 658 ulong cmd = kvmppc_get_gpr(vcpu, 3); 659 int i; 660 661 #ifdef CONFIG_KVM_BOOK3S_64_PR 662 if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE) { 663 r = RESUME_GUEST; 664 break; 665 } 666 #endif 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 return 0; 801 } 802 803 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, 804 struct kvm_sregs *sregs) 805 { 806 struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu); 807 int i; 808 809 kvmppc_set_pvr(vcpu, sregs->pvr); 810 811 vcpu3s->sdr1 = sregs->u.s.sdr1; 812 if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) { 813 for (i = 0; i < 64; i++) { 814 vcpu->arch.mmu.slbmte(vcpu, sregs->u.s.ppc64.slb[i].slbv, 815 sregs->u.s.ppc64.slb[i].slbe); 816 } 817 } else { 818 for (i = 0; i < 16; i++) { 819 vcpu->arch.mmu.mtsrin(vcpu, i, sregs->u.s.ppc32.sr[i]); 820 } 821 for (i = 0; i < 8; i++) { 822 kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), false, 823 (u32)sregs->u.s.ppc32.ibat[i]); 824 kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), true, 825 (u32)(sregs->u.s.ppc32.ibat[i] >> 32)); 826 kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), false, 827 (u32)sregs->u.s.ppc32.dbat[i]); 828 kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), true, 829 (u32)(sregs->u.s.ppc32.dbat[i] >> 32)); 830 } 831 } 832 833 /* Flush the MMU after messing with the segments */ 834 kvmppc_mmu_pte_flush(vcpu, 0, 0); 835 836 return 0; 837 } 838 839 int kvmppc_core_check_processor_compat(void) 840 { 841 return 0; 842 } 843 844 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id) 845 { 846 struct kvmppc_vcpu_book3s *vcpu_book3s; 847 struct kvm_vcpu *vcpu; 848 int err = -ENOMEM; 849 unsigned long p; 850 851 vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s)); 852 if (!vcpu_book3s) 853 goto out; 854 855 vcpu_book3s->shadow_vcpu = (struct kvmppc_book3s_shadow_vcpu *) 856 kzalloc(sizeof(*vcpu_book3s->shadow_vcpu), GFP_KERNEL); 857 if (!vcpu_book3s->shadow_vcpu) 858 goto free_vcpu; 859 860 vcpu = &vcpu_book3s->vcpu; 861 err = kvm_vcpu_init(vcpu, kvm, id); 862 if (err) 863 goto free_shadow_vcpu; 864 865 p = __get_free_page(GFP_KERNEL|__GFP_ZERO); 866 /* the real shared page fills the last 4k of our page */ 867 vcpu->arch.shared = (void*)(p + PAGE_SIZE - 4096); 868 if (!p) 869 goto uninit_vcpu; 870 871 #ifdef CONFIG_PPC_BOOK3S_64 872 /* default to book3s_64 (970fx) */ 873 vcpu->arch.pvr = 0x3C0301; 874 #else 875 /* default to book3s_32 (750) */ 876 vcpu->arch.pvr = 0x84202; 877 #endif 878 kvmppc_set_pvr(vcpu, vcpu->arch.pvr); 879 vcpu->arch.slb_nr = 64; 880 881 vcpu->arch.shadow_msr = MSR_USER64; 882 883 err = kvmppc_mmu_init(vcpu); 884 if (err < 0) 885 goto uninit_vcpu; 886 887 return vcpu; 888 889 uninit_vcpu: 890 kvm_vcpu_uninit(vcpu); 891 free_shadow_vcpu: 892 kfree(vcpu_book3s->shadow_vcpu); 893 free_vcpu: 894 vfree(vcpu_book3s); 895 out: 896 return ERR_PTR(err); 897 } 898 899 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu) 900 { 901 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); 902 903 free_page((unsigned long)vcpu->arch.shared & PAGE_MASK); 904 kvm_vcpu_uninit(vcpu); 905 kfree(vcpu_book3s->shadow_vcpu); 906 vfree(vcpu_book3s); 907 } 908 909 int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) 910 { 911 int ret; 912 double fpr[32][TS_FPRWIDTH]; 913 unsigned int fpscr; 914 int fpexc_mode; 915 #ifdef CONFIG_ALTIVEC 916 vector128 vr[32]; 917 vector128 vscr; 918 unsigned long uninitialized_var(vrsave); 919 int used_vr; 920 #endif 921 #ifdef CONFIG_VSX 922 int used_vsr; 923 #endif 924 ulong ext_msr; 925 926 /* Check if we can run the vcpu at all */ 927 if (!vcpu->arch.sane) { 928 kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 929 return -EINVAL; 930 } 931 932 /* No need to go into the guest when all we do is going out */ 933 if (signal_pending(current)) { 934 kvm_run->exit_reason = KVM_EXIT_INTR; 935 return -EINTR; 936 } 937 938 /* Save FPU state in stack */ 939 if (current->thread.regs->msr & MSR_FP) 940 giveup_fpu(current); 941 memcpy(fpr, current->thread.fpr, sizeof(current->thread.fpr)); 942 fpscr = current->thread.fpscr.val; 943 fpexc_mode = current->thread.fpexc_mode; 944 945 #ifdef CONFIG_ALTIVEC 946 /* Save Altivec state in stack */ 947 used_vr = current->thread.used_vr; 948 if (used_vr) { 949 if (current->thread.regs->msr & MSR_VEC) 950 giveup_altivec(current); 951 memcpy(vr, current->thread.vr, sizeof(current->thread.vr)); 952 vscr = current->thread.vscr; 953 vrsave = current->thread.vrsave; 954 } 955 #endif 956 957 #ifdef CONFIG_VSX 958 /* Save VSX state in stack */ 959 used_vsr = current->thread.used_vsr; 960 if (used_vsr && (current->thread.regs->msr & MSR_VSX)) 961 __giveup_vsx(current); 962 #endif 963 964 /* Remember the MSR with disabled extensions */ 965 ext_msr = current->thread.regs->msr; 966 967 /* Preload FPU if it's enabled */ 968 if (vcpu->arch.shared->msr & MSR_FP) 969 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP); 970 971 kvm_guest_enter(); 972 973 ret = __kvmppc_vcpu_run(kvm_run, vcpu); 974 975 kvm_guest_exit(); 976 977 local_irq_disable(); 978 979 current->thread.regs->msr = ext_msr; 980 981 /* Make sure we save the guest FPU/Altivec/VSX state */ 982 kvmppc_giveup_ext(vcpu, MSR_FP); 983 kvmppc_giveup_ext(vcpu, MSR_VEC); 984 kvmppc_giveup_ext(vcpu, MSR_VSX); 985 986 /* Restore FPU state from stack */ 987 memcpy(current->thread.fpr, fpr, sizeof(current->thread.fpr)); 988 current->thread.fpscr.val = fpscr; 989 current->thread.fpexc_mode = fpexc_mode; 990 991 #ifdef CONFIG_ALTIVEC 992 /* Restore Altivec state from stack */ 993 if (used_vr && current->thread.used_vr) { 994 memcpy(current->thread.vr, vr, sizeof(current->thread.vr)); 995 current->thread.vscr = vscr; 996 current->thread.vrsave = vrsave; 997 } 998 current->thread.used_vr = used_vr; 999 #endif 1000 1001 #ifdef CONFIG_VSX 1002 current->thread.used_vsr = used_vsr; 1003 #endif 1004 1005 return ret; 1006 } 1007 1008 int kvmppc_core_prepare_memory_region(struct kvm *kvm, 1009 struct kvm_userspace_memory_region *mem) 1010 { 1011 return 0; 1012 } 1013 1014 void kvmppc_core_commit_memory_region(struct kvm *kvm, 1015 struct kvm_userspace_memory_region *mem) 1016 { 1017 } 1018 1019 int kvmppc_core_init_vm(struct kvm *kvm) 1020 { 1021 return 0; 1022 } 1023 1024 void kvmppc_core_destroy_vm(struct kvm *kvm) 1025 { 1026 } 1027 1028 static int kvmppc_book3s_init(void) 1029 { 1030 int r; 1031 1032 r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_book3s), 0, 1033 THIS_MODULE); 1034 1035 if (r) 1036 return r; 1037 1038 r = kvmppc_mmu_hpte_sysinit(); 1039 1040 return r; 1041 } 1042 1043 static void kvmppc_book3s_exit(void) 1044 { 1045 kvmppc_mmu_hpte_sysexit(); 1046 kvm_exit(); 1047 } 1048 1049 module_init(kvmppc_book3s_init); 1050 module_exit(kvmppc_book3s_exit); 1051