1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Kernel-based Virtual Machine driver for Linux 4 * 5 * AMD SVM support 6 * 7 * Copyright (C) 2006 Qumranet, Inc. 8 * Copyright 2010 Red Hat, Inc. and/or its affiliates. 9 * 10 * Authors: 11 * Yaniv Kamay <yaniv@qumranet.com> 12 * Avi Kivity <avi@qumranet.com> 13 */ 14 15 #define pr_fmt(fmt) "SVM: " fmt 16 17 #include <linux/kvm_types.h> 18 #include <linux/kvm_host.h> 19 #include <linux/kernel.h> 20 21 #include <asm/msr-index.h> 22 #include <asm/debugreg.h> 23 24 #include "kvm_emulate.h" 25 #include "trace.h" 26 #include "mmu.h" 27 #include "x86.h" 28 #include "cpuid.h" 29 #include "lapic.h" 30 #include "svm.h" 31 32 static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu, 33 struct x86_exception *fault) 34 { 35 struct vcpu_svm *svm = to_svm(vcpu); 36 37 if (svm->vmcb->control.exit_code != SVM_EXIT_NPF) { 38 /* 39 * TODO: track the cause of the nested page fault, and 40 * correctly fill in the high bits of exit_info_1. 41 */ 42 svm->vmcb->control.exit_code = SVM_EXIT_NPF; 43 svm->vmcb->control.exit_code_hi = 0; 44 svm->vmcb->control.exit_info_1 = (1ULL << 32); 45 svm->vmcb->control.exit_info_2 = fault->address; 46 } 47 48 svm->vmcb->control.exit_info_1 &= ~0xffffffffULL; 49 svm->vmcb->control.exit_info_1 |= fault->error_code; 50 51 nested_svm_vmexit(svm); 52 } 53 54 static u64 nested_svm_get_tdp_pdptr(struct kvm_vcpu *vcpu, int index) 55 { 56 struct vcpu_svm *svm = to_svm(vcpu); 57 u64 cr3 = svm->nested.ctl.nested_cr3; 58 u64 pdpte; 59 int ret; 60 61 ret = kvm_vcpu_read_guest_page(vcpu, gpa_to_gfn(__sme_clr(cr3)), &pdpte, 62 offset_in_page(cr3) + index * 8, 8); 63 if (ret) 64 return 0; 65 return pdpte; 66 } 67 68 static unsigned long nested_svm_get_tdp_cr3(struct kvm_vcpu *vcpu) 69 { 70 struct vcpu_svm *svm = to_svm(vcpu); 71 72 return svm->nested.ctl.nested_cr3; 73 } 74 75 static void nested_svm_init_mmu_context(struct kvm_vcpu *vcpu) 76 { 77 struct vcpu_svm *svm = to_svm(vcpu); 78 struct vmcb *hsave = svm->nested.hsave; 79 80 WARN_ON(mmu_is_nested(vcpu)); 81 82 vcpu->arch.mmu = &vcpu->arch.guest_mmu; 83 kvm_init_shadow_npt_mmu(vcpu, X86_CR0_PG, hsave->save.cr4, hsave->save.efer, 84 svm->nested.ctl.nested_cr3); 85 vcpu->arch.mmu->get_guest_pgd = nested_svm_get_tdp_cr3; 86 vcpu->arch.mmu->get_pdptr = nested_svm_get_tdp_pdptr; 87 vcpu->arch.mmu->inject_page_fault = nested_svm_inject_npf_exit; 88 reset_shadow_zero_bits_mask(vcpu, vcpu->arch.mmu); 89 vcpu->arch.walk_mmu = &vcpu->arch.nested_mmu; 90 } 91 92 static void nested_svm_uninit_mmu_context(struct kvm_vcpu *vcpu) 93 { 94 vcpu->arch.mmu = &vcpu->arch.root_mmu; 95 vcpu->arch.walk_mmu = &vcpu->arch.root_mmu; 96 } 97 98 void recalc_intercepts(struct vcpu_svm *svm) 99 { 100 struct vmcb_control_area *c, *h, *g; 101 unsigned int i; 102 103 vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS); 104 105 if (!is_guest_mode(&svm->vcpu)) 106 return; 107 108 c = &svm->vmcb->control; 109 h = &svm->nested.hsave->control; 110 g = &svm->nested.ctl; 111 112 for (i = 0; i < MAX_INTERCEPT; i++) 113 c->intercepts[i] = h->intercepts[i]; 114 115 if (g->int_ctl & V_INTR_MASKING_MASK) { 116 /* We only want the cr8 intercept bits of L1 */ 117 vmcb_clr_intercept(c, INTERCEPT_CR8_READ); 118 vmcb_clr_intercept(c, INTERCEPT_CR8_WRITE); 119 120 /* 121 * Once running L2 with HF_VINTR_MASK, EFLAGS.IF does not 122 * affect any interrupt we may want to inject; therefore, 123 * interrupt window vmexits are irrelevant to L0. 124 */ 125 vmcb_clr_intercept(c, INTERCEPT_VINTR); 126 } 127 128 /* We don't want to see VMMCALLs from a nested guest */ 129 vmcb_clr_intercept(c, INTERCEPT_VMMCALL); 130 131 for (i = 0; i < MAX_INTERCEPT; i++) 132 c->intercepts[i] |= g->intercepts[i]; 133 } 134 135 static void copy_vmcb_control_area(struct vmcb_control_area *dst, 136 struct vmcb_control_area *from) 137 { 138 unsigned int i; 139 140 for (i = 0; i < MAX_INTERCEPT; i++) 141 dst->intercepts[i] = from->intercepts[i]; 142 143 dst->iopm_base_pa = from->iopm_base_pa; 144 dst->msrpm_base_pa = from->msrpm_base_pa; 145 dst->tsc_offset = from->tsc_offset; 146 /* asid not copied, it is handled manually for svm->vmcb. */ 147 dst->tlb_ctl = from->tlb_ctl; 148 dst->int_ctl = from->int_ctl; 149 dst->int_vector = from->int_vector; 150 dst->int_state = from->int_state; 151 dst->exit_code = from->exit_code; 152 dst->exit_code_hi = from->exit_code_hi; 153 dst->exit_info_1 = from->exit_info_1; 154 dst->exit_info_2 = from->exit_info_2; 155 dst->exit_int_info = from->exit_int_info; 156 dst->exit_int_info_err = from->exit_int_info_err; 157 dst->nested_ctl = from->nested_ctl; 158 dst->event_inj = from->event_inj; 159 dst->event_inj_err = from->event_inj_err; 160 dst->nested_cr3 = from->nested_cr3; 161 dst->virt_ext = from->virt_ext; 162 dst->pause_filter_count = from->pause_filter_count; 163 dst->pause_filter_thresh = from->pause_filter_thresh; 164 } 165 166 static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm) 167 { 168 /* 169 * This function merges the msr permission bitmaps of kvm and the 170 * nested vmcb. It is optimized in that it only merges the parts where 171 * the kvm msr permission bitmap may contain zero bits 172 */ 173 int i; 174 175 if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT))) 176 return true; 177 178 for (i = 0; i < MSRPM_OFFSETS; i++) { 179 u32 value, p; 180 u64 offset; 181 182 if (msrpm_offsets[i] == 0xffffffff) 183 break; 184 185 p = msrpm_offsets[i]; 186 offset = svm->nested.ctl.msrpm_base_pa + (p * 4); 187 188 if (kvm_vcpu_read_guest(&svm->vcpu, offset, &value, 4)) 189 return false; 190 191 svm->nested.msrpm[p] = svm->msrpm[p] | value; 192 } 193 194 svm->vmcb->control.msrpm_base_pa = __sme_set(__pa(svm->nested.msrpm)); 195 196 return true; 197 } 198 199 static bool svm_get_nested_state_pages(struct kvm_vcpu *vcpu) 200 { 201 struct vcpu_svm *svm = to_svm(vcpu); 202 203 if (WARN_ON(!is_guest_mode(vcpu))) 204 return true; 205 206 if (!nested_svm_vmrun_msrpm(svm)) { 207 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 208 vcpu->run->internal.suberror = 209 KVM_INTERNAL_ERROR_EMULATION; 210 vcpu->run->internal.ndata = 0; 211 return false; 212 } 213 214 return true; 215 } 216 217 static bool nested_vmcb_check_controls(struct vmcb_control_area *control) 218 { 219 if ((vmcb_is_intercept(control, INTERCEPT_VMRUN)) == 0) 220 return false; 221 222 if (control->asid == 0) 223 return false; 224 225 if ((control->nested_ctl & SVM_NESTED_CTL_NP_ENABLE) && 226 !npt_enabled) 227 return false; 228 229 return true; 230 } 231 232 static bool nested_vmcb_checks(struct vcpu_svm *svm, struct vmcb *vmcb12) 233 { 234 struct kvm_vcpu *vcpu = &svm->vcpu; 235 bool vmcb12_lma; 236 237 if ((vmcb12->save.efer & EFER_SVME) == 0) 238 return false; 239 240 if (((vmcb12->save.cr0 & X86_CR0_CD) == 0) && (vmcb12->save.cr0 & X86_CR0_NW)) 241 return false; 242 243 if (!kvm_dr6_valid(vmcb12->save.dr6) || !kvm_dr7_valid(vmcb12->save.dr7)) 244 return false; 245 246 vmcb12_lma = (vmcb12->save.efer & EFER_LME) && (vmcb12->save.cr0 & X86_CR0_PG); 247 248 if (vmcb12_lma) { 249 if (!(vmcb12->save.cr4 & X86_CR4_PAE) || 250 !(vmcb12->save.cr0 & X86_CR0_PE) || 251 (vmcb12->save.cr3 & vcpu->arch.cr3_lm_rsvd_bits)) 252 return false; 253 } 254 if (!kvm_is_valid_cr4(&svm->vcpu, vmcb12->save.cr4)) 255 return false; 256 257 return nested_vmcb_check_controls(&vmcb12->control); 258 } 259 260 static void load_nested_vmcb_control(struct vcpu_svm *svm, 261 struct vmcb_control_area *control) 262 { 263 copy_vmcb_control_area(&svm->nested.ctl, control); 264 265 /* Copy it here because nested_svm_check_controls will check it. */ 266 svm->nested.ctl.asid = control->asid; 267 svm->nested.ctl.msrpm_base_pa &= ~0x0fffULL; 268 svm->nested.ctl.iopm_base_pa &= ~0x0fffULL; 269 } 270 271 /* 272 * Synchronize fields that are written by the processor, so that 273 * they can be copied back into the nested_vmcb. 274 */ 275 void sync_nested_vmcb_control(struct vcpu_svm *svm) 276 { 277 u32 mask; 278 svm->nested.ctl.event_inj = svm->vmcb->control.event_inj; 279 svm->nested.ctl.event_inj_err = svm->vmcb->control.event_inj_err; 280 281 /* Only a few fields of int_ctl are written by the processor. */ 282 mask = V_IRQ_MASK | V_TPR_MASK; 283 if (!(svm->nested.ctl.int_ctl & V_INTR_MASKING_MASK) && 284 svm_is_intercept(svm, INTERCEPT_VINTR)) { 285 /* 286 * In order to request an interrupt window, L0 is usurping 287 * svm->vmcb->control.int_ctl and possibly setting V_IRQ 288 * even if it was clear in L1's VMCB. Restoring it would be 289 * wrong. However, in this case V_IRQ will remain true until 290 * interrupt_window_interception calls svm_clear_vintr and 291 * restores int_ctl. We can just leave it aside. 292 */ 293 mask &= ~V_IRQ_MASK; 294 } 295 svm->nested.ctl.int_ctl &= ~mask; 296 svm->nested.ctl.int_ctl |= svm->vmcb->control.int_ctl & mask; 297 } 298 299 /* 300 * Transfer any event that L0 or L1 wanted to inject into L2 to 301 * EXIT_INT_INFO. 302 */ 303 static void nested_vmcb_save_pending_event(struct vcpu_svm *svm, 304 struct vmcb *vmcb12) 305 { 306 struct kvm_vcpu *vcpu = &svm->vcpu; 307 u32 exit_int_info = 0; 308 unsigned int nr; 309 310 if (vcpu->arch.exception.injected) { 311 nr = vcpu->arch.exception.nr; 312 exit_int_info = nr | SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_EXEPT; 313 314 if (vcpu->arch.exception.has_error_code) { 315 exit_int_info |= SVM_EVTINJ_VALID_ERR; 316 vmcb12->control.exit_int_info_err = 317 vcpu->arch.exception.error_code; 318 } 319 320 } else if (vcpu->arch.nmi_injected) { 321 exit_int_info = SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_NMI; 322 323 } else if (vcpu->arch.interrupt.injected) { 324 nr = vcpu->arch.interrupt.nr; 325 exit_int_info = nr | SVM_EVTINJ_VALID; 326 327 if (vcpu->arch.interrupt.soft) 328 exit_int_info |= SVM_EVTINJ_TYPE_SOFT; 329 else 330 exit_int_info |= SVM_EVTINJ_TYPE_INTR; 331 } 332 333 vmcb12->control.exit_int_info = exit_int_info; 334 } 335 336 static inline bool nested_npt_enabled(struct vcpu_svm *svm) 337 { 338 return svm->nested.ctl.nested_ctl & SVM_NESTED_CTL_NP_ENABLE; 339 } 340 341 /* 342 * Load guest's/host's cr3 on nested vmentry or vmexit. @nested_npt is true 343 * if we are emulating VM-Entry into a guest with NPT enabled. 344 */ 345 static int nested_svm_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3, 346 bool nested_npt) 347 { 348 if (cr3 & rsvd_bits(cpuid_maxphyaddr(vcpu), 63)) 349 return -EINVAL; 350 351 if (!nested_npt && is_pae_paging(vcpu) && 352 (cr3 != kvm_read_cr3(vcpu) || pdptrs_changed(vcpu))) { 353 if (!load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3)) 354 return -EINVAL; 355 } 356 357 /* 358 * TODO: optimize unconditional TLB flush/MMU sync here and in 359 * kvm_init_shadow_npt_mmu(). 360 */ 361 if (!nested_npt) 362 kvm_mmu_new_pgd(vcpu, cr3, false, false); 363 364 vcpu->arch.cr3 = cr3; 365 kvm_register_mark_available(vcpu, VCPU_EXREG_CR3); 366 367 kvm_init_mmu(vcpu, false); 368 369 return 0; 370 } 371 372 static void nested_prepare_vmcb_save(struct vcpu_svm *svm, struct vmcb *vmcb12) 373 { 374 /* Load the nested guest state */ 375 svm->vmcb->save.es = vmcb12->save.es; 376 svm->vmcb->save.cs = vmcb12->save.cs; 377 svm->vmcb->save.ss = vmcb12->save.ss; 378 svm->vmcb->save.ds = vmcb12->save.ds; 379 svm->vmcb->save.gdtr = vmcb12->save.gdtr; 380 svm->vmcb->save.idtr = vmcb12->save.idtr; 381 kvm_set_rflags(&svm->vcpu, vmcb12->save.rflags | X86_EFLAGS_FIXED); 382 svm_set_efer(&svm->vcpu, vmcb12->save.efer); 383 svm_set_cr0(&svm->vcpu, vmcb12->save.cr0); 384 svm_set_cr4(&svm->vcpu, vmcb12->save.cr4); 385 svm->vmcb->save.cr2 = svm->vcpu.arch.cr2 = vmcb12->save.cr2; 386 kvm_rax_write(&svm->vcpu, vmcb12->save.rax); 387 kvm_rsp_write(&svm->vcpu, vmcb12->save.rsp); 388 kvm_rip_write(&svm->vcpu, vmcb12->save.rip); 389 390 /* In case we don't even reach vcpu_run, the fields are not updated */ 391 svm->vmcb->save.rax = vmcb12->save.rax; 392 svm->vmcb->save.rsp = vmcb12->save.rsp; 393 svm->vmcb->save.rip = vmcb12->save.rip; 394 svm->vmcb->save.dr7 = vmcb12->save.dr7 | DR7_FIXED_1; 395 svm->vcpu.arch.dr6 = vmcb12->save.dr6 | DR6_FIXED_1 | DR6_RTM; 396 svm->vmcb->save.cpl = vmcb12->save.cpl; 397 } 398 399 static void nested_prepare_vmcb_control(struct vcpu_svm *svm) 400 { 401 const u32 mask = V_INTR_MASKING_MASK | V_GIF_ENABLE_MASK | V_GIF_MASK; 402 403 if (nested_npt_enabled(svm)) 404 nested_svm_init_mmu_context(&svm->vcpu); 405 406 svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset = 407 svm->vcpu.arch.l1_tsc_offset + svm->nested.ctl.tsc_offset; 408 409 svm->vmcb->control.int_ctl = 410 (svm->nested.ctl.int_ctl & ~mask) | 411 (svm->nested.hsave->control.int_ctl & mask); 412 413 svm->vmcb->control.virt_ext = svm->nested.ctl.virt_ext; 414 svm->vmcb->control.int_vector = svm->nested.ctl.int_vector; 415 svm->vmcb->control.int_state = svm->nested.ctl.int_state; 416 svm->vmcb->control.event_inj = svm->nested.ctl.event_inj; 417 svm->vmcb->control.event_inj_err = svm->nested.ctl.event_inj_err; 418 419 svm->vmcb->control.pause_filter_count = svm->nested.ctl.pause_filter_count; 420 svm->vmcb->control.pause_filter_thresh = svm->nested.ctl.pause_filter_thresh; 421 422 /* Enter Guest-Mode */ 423 enter_guest_mode(&svm->vcpu); 424 425 /* 426 * Merge guest and host intercepts - must be called with vcpu in 427 * guest-mode to take affect here 428 */ 429 recalc_intercepts(svm); 430 431 vmcb_mark_all_dirty(svm->vmcb); 432 } 433 434 int enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb12_gpa, 435 struct vmcb *vmcb12) 436 { 437 int ret; 438 439 svm->nested.vmcb12_gpa = vmcb12_gpa; 440 load_nested_vmcb_control(svm, &vmcb12->control); 441 nested_prepare_vmcb_save(svm, vmcb12); 442 nested_prepare_vmcb_control(svm); 443 444 ret = nested_svm_load_cr3(&svm->vcpu, vmcb12->save.cr3, 445 nested_npt_enabled(svm)); 446 if (ret) 447 return ret; 448 449 svm_set_gif(svm, true); 450 451 return 0; 452 } 453 454 int nested_svm_vmrun(struct vcpu_svm *svm) 455 { 456 int ret; 457 struct vmcb *vmcb12; 458 struct vmcb *hsave = svm->nested.hsave; 459 struct vmcb *vmcb = svm->vmcb; 460 struct kvm_host_map map; 461 u64 vmcb12_gpa; 462 463 if (is_smm(&svm->vcpu)) { 464 kvm_queue_exception(&svm->vcpu, UD_VECTOR); 465 return 1; 466 } 467 468 vmcb12_gpa = svm->vmcb->save.rax; 469 ret = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(vmcb12_gpa), &map); 470 if (ret == -EINVAL) { 471 kvm_inject_gp(&svm->vcpu, 0); 472 return 1; 473 } else if (ret) { 474 return kvm_skip_emulated_instruction(&svm->vcpu); 475 } 476 477 ret = kvm_skip_emulated_instruction(&svm->vcpu); 478 479 vmcb12 = map.hva; 480 481 if (WARN_ON_ONCE(!svm->nested.initialized)) 482 return -EINVAL; 483 484 if (!nested_vmcb_checks(svm, vmcb12)) { 485 vmcb12->control.exit_code = SVM_EXIT_ERR; 486 vmcb12->control.exit_code_hi = 0; 487 vmcb12->control.exit_info_1 = 0; 488 vmcb12->control.exit_info_2 = 0; 489 goto out; 490 } 491 492 trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb12_gpa, 493 vmcb12->save.rip, 494 vmcb12->control.int_ctl, 495 vmcb12->control.event_inj, 496 vmcb12->control.nested_ctl); 497 498 trace_kvm_nested_intercepts(vmcb12->control.intercepts[INTERCEPT_CR] & 0xffff, 499 vmcb12->control.intercepts[INTERCEPT_CR] >> 16, 500 vmcb12->control.intercepts[INTERCEPT_EXCEPTION], 501 vmcb12->control.intercepts[INTERCEPT_WORD3], 502 vmcb12->control.intercepts[INTERCEPT_WORD4], 503 vmcb12->control.intercepts[INTERCEPT_WORD5]); 504 505 /* Clear internal status */ 506 kvm_clear_exception_queue(&svm->vcpu); 507 kvm_clear_interrupt_queue(&svm->vcpu); 508 509 /* 510 * Save the old vmcb, so we don't need to pick what we save, but can 511 * restore everything when a VMEXIT occurs 512 */ 513 hsave->save.es = vmcb->save.es; 514 hsave->save.cs = vmcb->save.cs; 515 hsave->save.ss = vmcb->save.ss; 516 hsave->save.ds = vmcb->save.ds; 517 hsave->save.gdtr = vmcb->save.gdtr; 518 hsave->save.idtr = vmcb->save.idtr; 519 hsave->save.efer = svm->vcpu.arch.efer; 520 hsave->save.cr0 = kvm_read_cr0(&svm->vcpu); 521 hsave->save.cr4 = svm->vcpu.arch.cr4; 522 hsave->save.rflags = kvm_get_rflags(&svm->vcpu); 523 hsave->save.rip = kvm_rip_read(&svm->vcpu); 524 hsave->save.rsp = vmcb->save.rsp; 525 hsave->save.rax = vmcb->save.rax; 526 if (npt_enabled) 527 hsave->save.cr3 = vmcb->save.cr3; 528 else 529 hsave->save.cr3 = kvm_read_cr3(&svm->vcpu); 530 531 copy_vmcb_control_area(&hsave->control, &vmcb->control); 532 533 svm->nested.nested_run_pending = 1; 534 535 if (enter_svm_guest_mode(svm, vmcb12_gpa, vmcb12)) 536 goto out_exit_err; 537 538 if (nested_svm_vmrun_msrpm(svm)) 539 goto out; 540 541 out_exit_err: 542 svm->nested.nested_run_pending = 0; 543 544 svm->vmcb->control.exit_code = SVM_EXIT_ERR; 545 svm->vmcb->control.exit_code_hi = 0; 546 svm->vmcb->control.exit_info_1 = 0; 547 svm->vmcb->control.exit_info_2 = 0; 548 549 nested_svm_vmexit(svm); 550 551 out: 552 kvm_vcpu_unmap(&svm->vcpu, &map, true); 553 554 return ret; 555 } 556 557 void nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb) 558 { 559 to_vmcb->save.fs = from_vmcb->save.fs; 560 to_vmcb->save.gs = from_vmcb->save.gs; 561 to_vmcb->save.tr = from_vmcb->save.tr; 562 to_vmcb->save.ldtr = from_vmcb->save.ldtr; 563 to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base; 564 to_vmcb->save.star = from_vmcb->save.star; 565 to_vmcb->save.lstar = from_vmcb->save.lstar; 566 to_vmcb->save.cstar = from_vmcb->save.cstar; 567 to_vmcb->save.sfmask = from_vmcb->save.sfmask; 568 to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs; 569 to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp; 570 to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip; 571 } 572 573 int nested_svm_vmexit(struct vcpu_svm *svm) 574 { 575 int rc; 576 struct vmcb *vmcb12; 577 struct vmcb *hsave = svm->nested.hsave; 578 struct vmcb *vmcb = svm->vmcb; 579 struct kvm_host_map map; 580 581 rc = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(svm->nested.vmcb12_gpa), &map); 582 if (rc) { 583 if (rc == -EINVAL) 584 kvm_inject_gp(&svm->vcpu, 0); 585 return 1; 586 } 587 588 vmcb12 = map.hva; 589 590 /* Exit Guest-Mode */ 591 leave_guest_mode(&svm->vcpu); 592 svm->nested.vmcb12_gpa = 0; 593 WARN_ON_ONCE(svm->nested.nested_run_pending); 594 595 kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, &svm->vcpu); 596 597 /* in case we halted in L2 */ 598 svm->vcpu.arch.mp_state = KVM_MP_STATE_RUNNABLE; 599 600 /* Give the current vmcb to the guest */ 601 602 vmcb12->save.es = vmcb->save.es; 603 vmcb12->save.cs = vmcb->save.cs; 604 vmcb12->save.ss = vmcb->save.ss; 605 vmcb12->save.ds = vmcb->save.ds; 606 vmcb12->save.gdtr = vmcb->save.gdtr; 607 vmcb12->save.idtr = vmcb->save.idtr; 608 vmcb12->save.efer = svm->vcpu.arch.efer; 609 vmcb12->save.cr0 = kvm_read_cr0(&svm->vcpu); 610 vmcb12->save.cr3 = kvm_read_cr3(&svm->vcpu); 611 vmcb12->save.cr2 = vmcb->save.cr2; 612 vmcb12->save.cr4 = svm->vcpu.arch.cr4; 613 vmcb12->save.rflags = kvm_get_rflags(&svm->vcpu); 614 vmcb12->save.rip = kvm_rip_read(&svm->vcpu); 615 vmcb12->save.rsp = kvm_rsp_read(&svm->vcpu); 616 vmcb12->save.rax = kvm_rax_read(&svm->vcpu); 617 vmcb12->save.dr7 = vmcb->save.dr7; 618 vmcb12->save.dr6 = svm->vcpu.arch.dr6; 619 vmcb12->save.cpl = vmcb->save.cpl; 620 621 vmcb12->control.int_state = vmcb->control.int_state; 622 vmcb12->control.exit_code = vmcb->control.exit_code; 623 vmcb12->control.exit_code_hi = vmcb->control.exit_code_hi; 624 vmcb12->control.exit_info_1 = vmcb->control.exit_info_1; 625 vmcb12->control.exit_info_2 = vmcb->control.exit_info_2; 626 627 if (vmcb12->control.exit_code != SVM_EXIT_ERR) 628 nested_vmcb_save_pending_event(svm, vmcb12); 629 630 if (svm->nrips_enabled) 631 vmcb12->control.next_rip = vmcb->control.next_rip; 632 633 vmcb12->control.int_ctl = svm->nested.ctl.int_ctl; 634 vmcb12->control.tlb_ctl = svm->nested.ctl.tlb_ctl; 635 vmcb12->control.event_inj = svm->nested.ctl.event_inj; 636 vmcb12->control.event_inj_err = svm->nested.ctl.event_inj_err; 637 638 vmcb12->control.pause_filter_count = 639 svm->vmcb->control.pause_filter_count; 640 vmcb12->control.pause_filter_thresh = 641 svm->vmcb->control.pause_filter_thresh; 642 643 /* Restore the original control entries */ 644 copy_vmcb_control_area(&vmcb->control, &hsave->control); 645 646 /* On vmexit the GIF is set to false */ 647 svm_set_gif(svm, false); 648 649 svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset = 650 svm->vcpu.arch.l1_tsc_offset; 651 652 svm->nested.ctl.nested_cr3 = 0; 653 654 /* Restore selected save entries */ 655 svm->vmcb->save.es = hsave->save.es; 656 svm->vmcb->save.cs = hsave->save.cs; 657 svm->vmcb->save.ss = hsave->save.ss; 658 svm->vmcb->save.ds = hsave->save.ds; 659 svm->vmcb->save.gdtr = hsave->save.gdtr; 660 svm->vmcb->save.idtr = hsave->save.idtr; 661 kvm_set_rflags(&svm->vcpu, hsave->save.rflags); 662 kvm_set_rflags(&svm->vcpu, hsave->save.rflags | X86_EFLAGS_FIXED); 663 svm_set_efer(&svm->vcpu, hsave->save.efer); 664 svm_set_cr0(&svm->vcpu, hsave->save.cr0 | X86_CR0_PE); 665 svm_set_cr4(&svm->vcpu, hsave->save.cr4); 666 kvm_rax_write(&svm->vcpu, hsave->save.rax); 667 kvm_rsp_write(&svm->vcpu, hsave->save.rsp); 668 kvm_rip_write(&svm->vcpu, hsave->save.rip); 669 svm->vmcb->save.dr7 = DR7_FIXED_1; 670 svm->vmcb->save.cpl = 0; 671 svm->vmcb->control.exit_int_info = 0; 672 673 vmcb_mark_all_dirty(svm->vmcb); 674 675 trace_kvm_nested_vmexit_inject(vmcb12->control.exit_code, 676 vmcb12->control.exit_info_1, 677 vmcb12->control.exit_info_2, 678 vmcb12->control.exit_int_info, 679 vmcb12->control.exit_int_info_err, 680 KVM_ISA_SVM); 681 682 kvm_vcpu_unmap(&svm->vcpu, &map, true); 683 684 nested_svm_uninit_mmu_context(&svm->vcpu); 685 686 rc = nested_svm_load_cr3(&svm->vcpu, hsave->save.cr3, false); 687 if (rc) 688 return 1; 689 690 if (npt_enabled) 691 svm->vmcb->save.cr3 = hsave->save.cr3; 692 693 /* 694 * Drop what we picked up for L2 via svm_complete_interrupts() so it 695 * doesn't end up in L1. 696 */ 697 svm->vcpu.arch.nmi_injected = false; 698 kvm_clear_exception_queue(&svm->vcpu); 699 kvm_clear_interrupt_queue(&svm->vcpu); 700 701 return 0; 702 } 703 704 int svm_allocate_nested(struct vcpu_svm *svm) 705 { 706 struct page *hsave_page; 707 708 if (svm->nested.initialized) 709 return 0; 710 711 hsave_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO); 712 if (!hsave_page) 713 return -ENOMEM; 714 svm->nested.hsave = page_address(hsave_page); 715 716 svm->nested.msrpm = svm_vcpu_alloc_msrpm(); 717 if (!svm->nested.msrpm) 718 goto err_free_hsave; 719 svm_vcpu_init_msrpm(&svm->vcpu, svm->nested.msrpm); 720 721 svm->nested.initialized = true; 722 return 0; 723 724 err_free_hsave: 725 __free_page(hsave_page); 726 return -ENOMEM; 727 } 728 729 void svm_free_nested(struct vcpu_svm *svm) 730 { 731 if (!svm->nested.initialized) 732 return; 733 734 svm_vcpu_free_msrpm(svm->nested.msrpm); 735 svm->nested.msrpm = NULL; 736 737 __free_page(virt_to_page(svm->nested.hsave)); 738 svm->nested.hsave = NULL; 739 740 svm->nested.initialized = false; 741 } 742 743 /* 744 * Forcibly leave nested mode in order to be able to reset the VCPU later on. 745 */ 746 void svm_leave_nested(struct vcpu_svm *svm) 747 { 748 if (is_guest_mode(&svm->vcpu)) { 749 struct vmcb *hsave = svm->nested.hsave; 750 struct vmcb *vmcb = svm->vmcb; 751 752 svm->nested.nested_run_pending = 0; 753 leave_guest_mode(&svm->vcpu); 754 copy_vmcb_control_area(&vmcb->control, &hsave->control); 755 nested_svm_uninit_mmu_context(&svm->vcpu); 756 vmcb_mark_all_dirty(svm->vmcb); 757 } 758 759 kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, &svm->vcpu); 760 } 761 762 static int nested_svm_exit_handled_msr(struct vcpu_svm *svm) 763 { 764 u32 offset, msr, value; 765 int write, mask; 766 767 if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT))) 768 return NESTED_EXIT_HOST; 769 770 msr = svm->vcpu.arch.regs[VCPU_REGS_RCX]; 771 offset = svm_msrpm_offset(msr); 772 write = svm->vmcb->control.exit_info_1 & 1; 773 mask = 1 << ((2 * (msr & 0xf)) + write); 774 775 if (offset == MSR_INVALID) 776 return NESTED_EXIT_DONE; 777 778 /* Offset is in 32 bit units but need in 8 bit units */ 779 offset *= 4; 780 781 if (kvm_vcpu_read_guest(&svm->vcpu, svm->nested.ctl.msrpm_base_pa + offset, &value, 4)) 782 return NESTED_EXIT_DONE; 783 784 return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST; 785 } 786 787 static int nested_svm_intercept_ioio(struct vcpu_svm *svm) 788 { 789 unsigned port, size, iopm_len; 790 u16 val, mask; 791 u8 start_bit; 792 u64 gpa; 793 794 if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_IOIO_PROT))) 795 return NESTED_EXIT_HOST; 796 797 port = svm->vmcb->control.exit_info_1 >> 16; 798 size = (svm->vmcb->control.exit_info_1 & SVM_IOIO_SIZE_MASK) >> 799 SVM_IOIO_SIZE_SHIFT; 800 gpa = svm->nested.ctl.iopm_base_pa + (port / 8); 801 start_bit = port % 8; 802 iopm_len = (start_bit + size > 8) ? 2 : 1; 803 mask = (0xf >> (4 - size)) << start_bit; 804 val = 0; 805 806 if (kvm_vcpu_read_guest(&svm->vcpu, gpa, &val, iopm_len)) 807 return NESTED_EXIT_DONE; 808 809 return (val & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST; 810 } 811 812 static int nested_svm_intercept(struct vcpu_svm *svm) 813 { 814 u32 exit_code = svm->vmcb->control.exit_code; 815 int vmexit = NESTED_EXIT_HOST; 816 817 switch (exit_code) { 818 case SVM_EXIT_MSR: 819 vmexit = nested_svm_exit_handled_msr(svm); 820 break; 821 case SVM_EXIT_IOIO: 822 vmexit = nested_svm_intercept_ioio(svm); 823 break; 824 case SVM_EXIT_READ_CR0 ... SVM_EXIT_WRITE_CR8: { 825 if (vmcb_is_intercept(&svm->nested.ctl, exit_code)) 826 vmexit = NESTED_EXIT_DONE; 827 break; 828 } 829 case SVM_EXIT_READ_DR0 ... SVM_EXIT_WRITE_DR7: { 830 if (vmcb_is_intercept(&svm->nested.ctl, exit_code)) 831 vmexit = NESTED_EXIT_DONE; 832 break; 833 } 834 case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: { 835 /* 836 * Host-intercepted exceptions have been checked already in 837 * nested_svm_exit_special. There is nothing to do here, 838 * the vmexit is injected by svm_check_nested_events. 839 */ 840 vmexit = NESTED_EXIT_DONE; 841 break; 842 } 843 case SVM_EXIT_ERR: { 844 vmexit = NESTED_EXIT_DONE; 845 break; 846 } 847 default: { 848 if (vmcb_is_intercept(&svm->nested.ctl, exit_code)) 849 vmexit = NESTED_EXIT_DONE; 850 } 851 } 852 853 return vmexit; 854 } 855 856 int nested_svm_exit_handled(struct vcpu_svm *svm) 857 { 858 int vmexit; 859 860 vmexit = nested_svm_intercept(svm); 861 862 if (vmexit == NESTED_EXIT_DONE) 863 nested_svm_vmexit(svm); 864 865 return vmexit; 866 } 867 868 int nested_svm_check_permissions(struct vcpu_svm *svm) 869 { 870 if (!(svm->vcpu.arch.efer & EFER_SVME) || 871 !is_paging(&svm->vcpu)) { 872 kvm_queue_exception(&svm->vcpu, UD_VECTOR); 873 return 1; 874 } 875 876 if (svm->vmcb->save.cpl) { 877 kvm_inject_gp(&svm->vcpu, 0); 878 return 1; 879 } 880 881 return 0; 882 } 883 884 static bool nested_exit_on_exception(struct vcpu_svm *svm) 885 { 886 unsigned int nr = svm->vcpu.arch.exception.nr; 887 888 return (svm->nested.ctl.intercepts[INTERCEPT_EXCEPTION] & BIT(nr)); 889 } 890 891 static void nested_svm_inject_exception_vmexit(struct vcpu_svm *svm) 892 { 893 unsigned int nr = svm->vcpu.arch.exception.nr; 894 895 svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr; 896 svm->vmcb->control.exit_code_hi = 0; 897 898 if (svm->vcpu.arch.exception.has_error_code) 899 svm->vmcb->control.exit_info_1 = svm->vcpu.arch.exception.error_code; 900 901 /* 902 * EXITINFO2 is undefined for all exception intercepts other 903 * than #PF. 904 */ 905 if (nr == PF_VECTOR) { 906 if (svm->vcpu.arch.exception.nested_apf) 907 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.apf.nested_apf_token; 908 else if (svm->vcpu.arch.exception.has_payload) 909 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.exception.payload; 910 else 911 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2; 912 } else if (nr == DB_VECTOR) { 913 /* See inject_pending_event. */ 914 kvm_deliver_exception_payload(&svm->vcpu); 915 if (svm->vcpu.arch.dr7 & DR7_GD) { 916 svm->vcpu.arch.dr7 &= ~DR7_GD; 917 kvm_update_dr7(&svm->vcpu); 918 } 919 } else 920 WARN_ON(svm->vcpu.arch.exception.has_payload); 921 922 nested_svm_vmexit(svm); 923 } 924 925 static void nested_svm_smi(struct vcpu_svm *svm) 926 { 927 svm->vmcb->control.exit_code = SVM_EXIT_SMI; 928 svm->vmcb->control.exit_info_1 = 0; 929 svm->vmcb->control.exit_info_2 = 0; 930 931 nested_svm_vmexit(svm); 932 } 933 934 static void nested_svm_nmi(struct vcpu_svm *svm) 935 { 936 svm->vmcb->control.exit_code = SVM_EXIT_NMI; 937 svm->vmcb->control.exit_info_1 = 0; 938 svm->vmcb->control.exit_info_2 = 0; 939 940 nested_svm_vmexit(svm); 941 } 942 943 static void nested_svm_intr(struct vcpu_svm *svm) 944 { 945 trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip); 946 947 svm->vmcb->control.exit_code = SVM_EXIT_INTR; 948 svm->vmcb->control.exit_info_1 = 0; 949 svm->vmcb->control.exit_info_2 = 0; 950 951 nested_svm_vmexit(svm); 952 } 953 954 static inline bool nested_exit_on_init(struct vcpu_svm *svm) 955 { 956 return vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_INIT); 957 } 958 959 static void nested_svm_init(struct vcpu_svm *svm) 960 { 961 svm->vmcb->control.exit_code = SVM_EXIT_INIT; 962 svm->vmcb->control.exit_info_1 = 0; 963 svm->vmcb->control.exit_info_2 = 0; 964 965 nested_svm_vmexit(svm); 966 } 967 968 969 static int svm_check_nested_events(struct kvm_vcpu *vcpu) 970 { 971 struct vcpu_svm *svm = to_svm(vcpu); 972 bool block_nested_events = 973 kvm_event_needs_reinjection(vcpu) || svm->nested.nested_run_pending; 974 struct kvm_lapic *apic = vcpu->arch.apic; 975 976 if (lapic_in_kernel(vcpu) && 977 test_bit(KVM_APIC_INIT, &apic->pending_events)) { 978 if (block_nested_events) 979 return -EBUSY; 980 if (!nested_exit_on_init(svm)) 981 return 0; 982 nested_svm_init(svm); 983 return 0; 984 } 985 986 if (vcpu->arch.exception.pending) { 987 if (block_nested_events) 988 return -EBUSY; 989 if (!nested_exit_on_exception(svm)) 990 return 0; 991 nested_svm_inject_exception_vmexit(svm); 992 return 0; 993 } 994 995 if (vcpu->arch.smi_pending && !svm_smi_blocked(vcpu)) { 996 if (block_nested_events) 997 return -EBUSY; 998 if (!nested_exit_on_smi(svm)) 999 return 0; 1000 nested_svm_smi(svm); 1001 return 0; 1002 } 1003 1004 if (vcpu->arch.nmi_pending && !svm_nmi_blocked(vcpu)) { 1005 if (block_nested_events) 1006 return -EBUSY; 1007 if (!nested_exit_on_nmi(svm)) 1008 return 0; 1009 nested_svm_nmi(svm); 1010 return 0; 1011 } 1012 1013 if (kvm_cpu_has_interrupt(vcpu) && !svm_interrupt_blocked(vcpu)) { 1014 if (block_nested_events) 1015 return -EBUSY; 1016 if (!nested_exit_on_intr(svm)) 1017 return 0; 1018 nested_svm_intr(svm); 1019 return 0; 1020 } 1021 1022 return 0; 1023 } 1024 1025 int nested_svm_exit_special(struct vcpu_svm *svm) 1026 { 1027 u32 exit_code = svm->vmcb->control.exit_code; 1028 1029 switch (exit_code) { 1030 case SVM_EXIT_INTR: 1031 case SVM_EXIT_NMI: 1032 case SVM_EXIT_NPF: 1033 return NESTED_EXIT_HOST; 1034 case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: { 1035 u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE); 1036 1037 if (get_host_vmcb(svm)->control.intercepts[INTERCEPT_EXCEPTION] & 1038 excp_bits) 1039 return NESTED_EXIT_HOST; 1040 else if (exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR && 1041 svm->vcpu.arch.apf.host_apf_flags) 1042 /* Trap async PF even if not shadowing */ 1043 return NESTED_EXIT_HOST; 1044 break; 1045 } 1046 default: 1047 break; 1048 } 1049 1050 return NESTED_EXIT_CONTINUE; 1051 } 1052 1053 static int svm_get_nested_state(struct kvm_vcpu *vcpu, 1054 struct kvm_nested_state __user *user_kvm_nested_state, 1055 u32 user_data_size) 1056 { 1057 struct vcpu_svm *svm; 1058 struct kvm_nested_state kvm_state = { 1059 .flags = 0, 1060 .format = KVM_STATE_NESTED_FORMAT_SVM, 1061 .size = sizeof(kvm_state), 1062 }; 1063 struct vmcb __user *user_vmcb = (struct vmcb __user *) 1064 &user_kvm_nested_state->data.svm[0]; 1065 1066 if (!vcpu) 1067 return kvm_state.size + KVM_STATE_NESTED_SVM_VMCB_SIZE; 1068 1069 svm = to_svm(vcpu); 1070 1071 if (user_data_size < kvm_state.size) 1072 goto out; 1073 1074 /* First fill in the header and copy it out. */ 1075 if (is_guest_mode(vcpu)) { 1076 kvm_state.hdr.svm.vmcb_pa = svm->nested.vmcb12_gpa; 1077 kvm_state.size += KVM_STATE_NESTED_SVM_VMCB_SIZE; 1078 kvm_state.flags |= KVM_STATE_NESTED_GUEST_MODE; 1079 1080 if (svm->nested.nested_run_pending) 1081 kvm_state.flags |= KVM_STATE_NESTED_RUN_PENDING; 1082 } 1083 1084 if (gif_set(svm)) 1085 kvm_state.flags |= KVM_STATE_NESTED_GIF_SET; 1086 1087 if (copy_to_user(user_kvm_nested_state, &kvm_state, sizeof(kvm_state))) 1088 return -EFAULT; 1089 1090 if (!is_guest_mode(vcpu)) 1091 goto out; 1092 1093 /* 1094 * Copy over the full size of the VMCB rather than just the size 1095 * of the structs. 1096 */ 1097 if (clear_user(user_vmcb, KVM_STATE_NESTED_SVM_VMCB_SIZE)) 1098 return -EFAULT; 1099 if (copy_to_user(&user_vmcb->control, &svm->nested.ctl, 1100 sizeof(user_vmcb->control))) 1101 return -EFAULT; 1102 if (copy_to_user(&user_vmcb->save, &svm->nested.hsave->save, 1103 sizeof(user_vmcb->save))) 1104 return -EFAULT; 1105 1106 out: 1107 return kvm_state.size; 1108 } 1109 1110 static int svm_set_nested_state(struct kvm_vcpu *vcpu, 1111 struct kvm_nested_state __user *user_kvm_nested_state, 1112 struct kvm_nested_state *kvm_state) 1113 { 1114 struct vcpu_svm *svm = to_svm(vcpu); 1115 struct vmcb *hsave = svm->nested.hsave; 1116 struct vmcb __user *user_vmcb = (struct vmcb __user *) 1117 &user_kvm_nested_state->data.svm[0]; 1118 struct vmcb_control_area *ctl; 1119 struct vmcb_save_area *save; 1120 int ret; 1121 u32 cr0; 1122 1123 BUILD_BUG_ON(sizeof(struct vmcb_control_area) + sizeof(struct vmcb_save_area) > 1124 KVM_STATE_NESTED_SVM_VMCB_SIZE); 1125 1126 if (kvm_state->format != KVM_STATE_NESTED_FORMAT_SVM) 1127 return -EINVAL; 1128 1129 if (kvm_state->flags & ~(KVM_STATE_NESTED_GUEST_MODE | 1130 KVM_STATE_NESTED_RUN_PENDING | 1131 KVM_STATE_NESTED_GIF_SET)) 1132 return -EINVAL; 1133 1134 /* 1135 * If in guest mode, vcpu->arch.efer actually refers to the L2 guest's 1136 * EFER.SVME, but EFER.SVME still has to be 1 for VMRUN to succeed. 1137 */ 1138 if (!(vcpu->arch.efer & EFER_SVME)) { 1139 /* GIF=1 and no guest mode are required if SVME=0. */ 1140 if (kvm_state->flags != KVM_STATE_NESTED_GIF_SET) 1141 return -EINVAL; 1142 } 1143 1144 /* SMM temporarily disables SVM, so we cannot be in guest mode. */ 1145 if (is_smm(vcpu) && (kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE)) 1146 return -EINVAL; 1147 1148 if (!(kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE)) { 1149 svm_leave_nested(svm); 1150 svm_set_gif(svm, !!(kvm_state->flags & KVM_STATE_NESTED_GIF_SET)); 1151 return 0; 1152 } 1153 1154 if (!page_address_valid(vcpu, kvm_state->hdr.svm.vmcb_pa)) 1155 return -EINVAL; 1156 if (kvm_state->size < sizeof(*kvm_state) + KVM_STATE_NESTED_SVM_VMCB_SIZE) 1157 return -EINVAL; 1158 1159 ret = -ENOMEM; 1160 ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); 1161 save = kzalloc(sizeof(*save), GFP_KERNEL); 1162 if (!ctl || !save) 1163 goto out_free; 1164 1165 ret = -EFAULT; 1166 if (copy_from_user(ctl, &user_vmcb->control, sizeof(*ctl))) 1167 goto out_free; 1168 if (copy_from_user(save, &user_vmcb->save, sizeof(*save))) 1169 goto out_free; 1170 1171 ret = -EINVAL; 1172 if (!nested_vmcb_check_controls(ctl)) 1173 goto out_free; 1174 1175 /* 1176 * Processor state contains L2 state. Check that it is 1177 * valid for guest mode (see nested_vmcb_checks). 1178 */ 1179 cr0 = kvm_read_cr0(vcpu); 1180 if (((cr0 & X86_CR0_CD) == 0) && (cr0 & X86_CR0_NW)) 1181 goto out_free; 1182 1183 /* 1184 * Validate host state saved from before VMRUN (see 1185 * nested_svm_check_permissions). 1186 * TODO: validate reserved bits for all saved state. 1187 */ 1188 if (!(save->cr0 & X86_CR0_PG)) 1189 goto out_free; 1190 1191 /* 1192 * All checks done, we can enter guest mode. L1 control fields 1193 * come from the nested save state. Guest state is already 1194 * in the registers, the save area of the nested state instead 1195 * contains saved L1 state. 1196 */ 1197 1198 svm->nested.nested_run_pending = 1199 !!(kvm_state->flags & KVM_STATE_NESTED_RUN_PENDING); 1200 1201 copy_vmcb_control_area(&hsave->control, &svm->vmcb->control); 1202 hsave->save = *save; 1203 1204 svm->nested.vmcb12_gpa = kvm_state->hdr.svm.vmcb_pa; 1205 load_nested_vmcb_control(svm, ctl); 1206 nested_prepare_vmcb_control(svm); 1207 1208 kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu); 1209 ret = 0; 1210 out_free: 1211 kfree(save); 1212 kfree(ctl); 1213 1214 return ret; 1215 } 1216 1217 struct kvm_x86_nested_ops svm_nested_ops = { 1218 .check_events = svm_check_nested_events, 1219 .get_nested_state_pages = svm_get_nested_state_pages, 1220 .get_state = svm_get_nested_state, 1221 .set_state = svm_set_nested_state, 1222 }; 1223