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 void svm_inject_page_fault_nested(struct kvm_vcpu *vcpu, struct x86_exception *fault) 55 { 56 struct vcpu_svm *svm = to_svm(vcpu); 57 WARN_ON(!is_guest_mode(vcpu)); 58 59 if (vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_EXCEPTION_OFFSET + PF_VECTOR) && 60 !svm->nested.nested_run_pending) { 61 svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + PF_VECTOR; 62 svm->vmcb->control.exit_code_hi = 0; 63 svm->vmcb->control.exit_info_1 = fault->error_code; 64 svm->vmcb->control.exit_info_2 = fault->address; 65 nested_svm_vmexit(svm); 66 } else { 67 kvm_inject_page_fault(vcpu, fault); 68 } 69 } 70 71 static u64 nested_svm_get_tdp_pdptr(struct kvm_vcpu *vcpu, int index) 72 { 73 struct vcpu_svm *svm = to_svm(vcpu); 74 u64 cr3 = svm->nested.ctl.nested_cr3; 75 u64 pdpte; 76 int ret; 77 78 ret = kvm_vcpu_read_guest_page(vcpu, gpa_to_gfn(cr3), &pdpte, 79 offset_in_page(cr3) + index * 8, 8); 80 if (ret) 81 return 0; 82 return pdpte; 83 } 84 85 static unsigned long nested_svm_get_tdp_cr3(struct kvm_vcpu *vcpu) 86 { 87 struct vcpu_svm *svm = to_svm(vcpu); 88 89 return svm->nested.ctl.nested_cr3; 90 } 91 92 static void nested_svm_init_mmu_context(struct kvm_vcpu *vcpu) 93 { 94 struct vcpu_svm *svm = to_svm(vcpu); 95 struct vmcb *hsave = svm->nested.hsave; 96 97 WARN_ON(mmu_is_nested(vcpu)); 98 99 vcpu->arch.mmu = &vcpu->arch.guest_mmu; 100 kvm_init_shadow_npt_mmu(vcpu, X86_CR0_PG, hsave->save.cr4, hsave->save.efer, 101 svm->nested.ctl.nested_cr3); 102 vcpu->arch.mmu->get_guest_pgd = nested_svm_get_tdp_cr3; 103 vcpu->arch.mmu->get_pdptr = nested_svm_get_tdp_pdptr; 104 vcpu->arch.mmu->inject_page_fault = nested_svm_inject_npf_exit; 105 reset_shadow_zero_bits_mask(vcpu, vcpu->arch.mmu); 106 vcpu->arch.walk_mmu = &vcpu->arch.nested_mmu; 107 } 108 109 static void nested_svm_uninit_mmu_context(struct kvm_vcpu *vcpu) 110 { 111 vcpu->arch.mmu = &vcpu->arch.root_mmu; 112 vcpu->arch.walk_mmu = &vcpu->arch.root_mmu; 113 } 114 115 void recalc_intercepts(struct vcpu_svm *svm) 116 { 117 struct vmcb_control_area *c, *h, *g; 118 unsigned int i; 119 120 vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS); 121 122 if (!is_guest_mode(&svm->vcpu)) 123 return; 124 125 c = &svm->vmcb->control; 126 h = &svm->nested.hsave->control; 127 g = &svm->nested.ctl; 128 129 for (i = 0; i < MAX_INTERCEPT; i++) 130 c->intercepts[i] = h->intercepts[i]; 131 132 if (g->int_ctl & V_INTR_MASKING_MASK) { 133 /* We only want the cr8 intercept bits of L1 */ 134 vmcb_clr_intercept(c, INTERCEPT_CR8_READ); 135 vmcb_clr_intercept(c, INTERCEPT_CR8_WRITE); 136 137 /* 138 * Once running L2 with HF_VINTR_MASK, EFLAGS.IF does not 139 * affect any interrupt we may want to inject; therefore, 140 * interrupt window vmexits are irrelevant to L0. 141 */ 142 vmcb_clr_intercept(c, INTERCEPT_VINTR); 143 } 144 145 /* We don't want to see VMMCALLs from a nested guest */ 146 vmcb_clr_intercept(c, INTERCEPT_VMMCALL); 147 148 for (i = 0; i < MAX_INTERCEPT; i++) 149 c->intercepts[i] |= g->intercepts[i]; 150 } 151 152 static void copy_vmcb_control_area(struct vmcb_control_area *dst, 153 struct vmcb_control_area *from) 154 { 155 unsigned int i; 156 157 for (i = 0; i < MAX_INTERCEPT; i++) 158 dst->intercepts[i] = from->intercepts[i]; 159 160 dst->iopm_base_pa = from->iopm_base_pa; 161 dst->msrpm_base_pa = from->msrpm_base_pa; 162 dst->tsc_offset = from->tsc_offset; 163 /* asid not copied, it is handled manually for svm->vmcb. */ 164 dst->tlb_ctl = from->tlb_ctl; 165 dst->int_ctl = from->int_ctl; 166 dst->int_vector = from->int_vector; 167 dst->int_state = from->int_state; 168 dst->exit_code = from->exit_code; 169 dst->exit_code_hi = from->exit_code_hi; 170 dst->exit_info_1 = from->exit_info_1; 171 dst->exit_info_2 = from->exit_info_2; 172 dst->exit_int_info = from->exit_int_info; 173 dst->exit_int_info_err = from->exit_int_info_err; 174 dst->nested_ctl = from->nested_ctl; 175 dst->event_inj = from->event_inj; 176 dst->event_inj_err = from->event_inj_err; 177 dst->nested_cr3 = from->nested_cr3; 178 dst->virt_ext = from->virt_ext; 179 dst->pause_filter_count = from->pause_filter_count; 180 dst->pause_filter_thresh = from->pause_filter_thresh; 181 } 182 183 static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm) 184 { 185 /* 186 * This function merges the msr permission bitmaps of kvm and the 187 * nested vmcb. It is optimized in that it only merges the parts where 188 * the kvm msr permission bitmap may contain zero bits 189 */ 190 int i; 191 192 if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT))) 193 return true; 194 195 for (i = 0; i < MSRPM_OFFSETS; i++) { 196 u32 value, p; 197 u64 offset; 198 199 if (msrpm_offsets[i] == 0xffffffff) 200 break; 201 202 p = msrpm_offsets[i]; 203 offset = svm->nested.ctl.msrpm_base_pa + (p * 4); 204 205 if (kvm_vcpu_read_guest(&svm->vcpu, offset, &value, 4)) 206 return false; 207 208 svm->nested.msrpm[p] = svm->msrpm[p] | value; 209 } 210 211 svm->vmcb->control.msrpm_base_pa = __sme_set(__pa(svm->nested.msrpm)); 212 213 return true; 214 } 215 216 static bool svm_get_nested_state_pages(struct kvm_vcpu *vcpu) 217 { 218 struct vcpu_svm *svm = to_svm(vcpu); 219 220 if (WARN_ON(!is_guest_mode(vcpu))) 221 return true; 222 223 if (!nested_svm_vmrun_msrpm(svm)) { 224 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 225 vcpu->run->internal.suberror = 226 KVM_INTERNAL_ERROR_EMULATION; 227 vcpu->run->internal.ndata = 0; 228 return false; 229 } 230 231 return true; 232 } 233 234 static bool nested_vmcb_check_controls(struct vmcb_control_area *control) 235 { 236 if ((vmcb_is_intercept(control, INTERCEPT_VMRUN)) == 0) 237 return false; 238 239 if (control->asid == 0) 240 return false; 241 242 if ((control->nested_ctl & SVM_NESTED_CTL_NP_ENABLE) && 243 !npt_enabled) 244 return false; 245 246 return true; 247 } 248 249 static bool nested_vmcb_checks(struct vcpu_svm *svm, struct vmcb *vmcb12) 250 { 251 struct kvm_vcpu *vcpu = &svm->vcpu; 252 bool vmcb12_lma; 253 254 if ((vmcb12->save.efer & EFER_SVME) == 0) 255 return false; 256 257 if (((vmcb12->save.cr0 & X86_CR0_CD) == 0) && (vmcb12->save.cr0 & X86_CR0_NW)) 258 return false; 259 260 if (!kvm_dr6_valid(vmcb12->save.dr6) || !kvm_dr7_valid(vmcb12->save.dr7)) 261 return false; 262 263 vmcb12_lma = (vmcb12->save.efer & EFER_LME) && (vmcb12->save.cr0 & X86_CR0_PG); 264 265 if (vmcb12_lma) { 266 if (!(vmcb12->save.cr4 & X86_CR4_PAE) || 267 !(vmcb12->save.cr0 & X86_CR0_PE) || 268 kvm_vcpu_is_illegal_gpa(vcpu, vmcb12->save.cr3)) 269 return false; 270 } 271 if (!kvm_is_valid_cr4(&svm->vcpu, vmcb12->save.cr4)) 272 return false; 273 274 return nested_vmcb_check_controls(&vmcb12->control); 275 } 276 277 static void load_nested_vmcb_control(struct vcpu_svm *svm, 278 struct vmcb_control_area *control) 279 { 280 copy_vmcb_control_area(&svm->nested.ctl, control); 281 282 /* Copy it here because nested_svm_check_controls will check it. */ 283 svm->nested.ctl.asid = control->asid; 284 svm->nested.ctl.msrpm_base_pa &= ~0x0fffULL; 285 svm->nested.ctl.iopm_base_pa &= ~0x0fffULL; 286 } 287 288 /* 289 * Synchronize fields that are written by the processor, so that 290 * they can be copied back into the nested_vmcb. 291 */ 292 void sync_nested_vmcb_control(struct vcpu_svm *svm) 293 { 294 u32 mask; 295 svm->nested.ctl.event_inj = svm->vmcb->control.event_inj; 296 svm->nested.ctl.event_inj_err = svm->vmcb->control.event_inj_err; 297 298 /* Only a few fields of int_ctl are written by the processor. */ 299 mask = V_IRQ_MASK | V_TPR_MASK; 300 if (!(svm->nested.ctl.int_ctl & V_INTR_MASKING_MASK) && 301 svm_is_intercept(svm, INTERCEPT_VINTR)) { 302 /* 303 * In order to request an interrupt window, L0 is usurping 304 * svm->vmcb->control.int_ctl and possibly setting V_IRQ 305 * even if it was clear in L1's VMCB. Restoring it would be 306 * wrong. However, in this case V_IRQ will remain true until 307 * interrupt_window_interception calls svm_clear_vintr and 308 * restores int_ctl. We can just leave it aside. 309 */ 310 mask &= ~V_IRQ_MASK; 311 } 312 svm->nested.ctl.int_ctl &= ~mask; 313 svm->nested.ctl.int_ctl |= svm->vmcb->control.int_ctl & mask; 314 } 315 316 /* 317 * Transfer any event that L0 or L1 wanted to inject into L2 to 318 * EXIT_INT_INFO. 319 */ 320 static void nested_vmcb_save_pending_event(struct vcpu_svm *svm, 321 struct vmcb *vmcb12) 322 { 323 struct kvm_vcpu *vcpu = &svm->vcpu; 324 u32 exit_int_info = 0; 325 unsigned int nr; 326 327 if (vcpu->arch.exception.injected) { 328 nr = vcpu->arch.exception.nr; 329 exit_int_info = nr | SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_EXEPT; 330 331 if (vcpu->arch.exception.has_error_code) { 332 exit_int_info |= SVM_EVTINJ_VALID_ERR; 333 vmcb12->control.exit_int_info_err = 334 vcpu->arch.exception.error_code; 335 } 336 337 } else if (vcpu->arch.nmi_injected) { 338 exit_int_info = SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_NMI; 339 340 } else if (vcpu->arch.interrupt.injected) { 341 nr = vcpu->arch.interrupt.nr; 342 exit_int_info = nr | SVM_EVTINJ_VALID; 343 344 if (vcpu->arch.interrupt.soft) 345 exit_int_info |= SVM_EVTINJ_TYPE_SOFT; 346 else 347 exit_int_info |= SVM_EVTINJ_TYPE_INTR; 348 } 349 350 vmcb12->control.exit_int_info = exit_int_info; 351 } 352 353 static inline bool nested_npt_enabled(struct vcpu_svm *svm) 354 { 355 return svm->nested.ctl.nested_ctl & SVM_NESTED_CTL_NP_ENABLE; 356 } 357 358 /* 359 * Load guest's/host's cr3 on nested vmentry or vmexit. @nested_npt is true 360 * if we are emulating VM-Entry into a guest with NPT enabled. 361 */ 362 static int nested_svm_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3, 363 bool nested_npt) 364 { 365 if (kvm_vcpu_is_illegal_gpa(vcpu, cr3)) 366 return -EINVAL; 367 368 if (!nested_npt && is_pae_paging(vcpu) && 369 (cr3 != kvm_read_cr3(vcpu) || pdptrs_changed(vcpu))) { 370 if (!load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3)) 371 return -EINVAL; 372 } 373 374 /* 375 * TODO: optimize unconditional TLB flush/MMU sync here and in 376 * kvm_init_shadow_npt_mmu(). 377 */ 378 if (!nested_npt) 379 kvm_mmu_new_pgd(vcpu, cr3, false, false); 380 381 vcpu->arch.cr3 = cr3; 382 kvm_register_mark_available(vcpu, VCPU_EXREG_CR3); 383 384 kvm_init_mmu(vcpu, false); 385 386 return 0; 387 } 388 389 static void nested_prepare_vmcb_save(struct vcpu_svm *svm, struct vmcb *vmcb12) 390 { 391 /* Load the nested guest state */ 392 svm->vmcb->save.es = vmcb12->save.es; 393 svm->vmcb->save.cs = vmcb12->save.cs; 394 svm->vmcb->save.ss = vmcb12->save.ss; 395 svm->vmcb->save.ds = vmcb12->save.ds; 396 svm->vmcb->save.gdtr = vmcb12->save.gdtr; 397 svm->vmcb->save.idtr = vmcb12->save.idtr; 398 kvm_set_rflags(&svm->vcpu, vmcb12->save.rflags | X86_EFLAGS_FIXED); 399 svm_set_efer(&svm->vcpu, vmcb12->save.efer); 400 svm_set_cr0(&svm->vcpu, vmcb12->save.cr0); 401 svm_set_cr4(&svm->vcpu, vmcb12->save.cr4); 402 svm->vmcb->save.cr2 = svm->vcpu.arch.cr2 = vmcb12->save.cr2; 403 kvm_rax_write(&svm->vcpu, vmcb12->save.rax); 404 kvm_rsp_write(&svm->vcpu, vmcb12->save.rsp); 405 kvm_rip_write(&svm->vcpu, vmcb12->save.rip); 406 407 /* In case we don't even reach vcpu_run, the fields are not updated */ 408 svm->vmcb->save.rax = vmcb12->save.rax; 409 svm->vmcb->save.rsp = vmcb12->save.rsp; 410 svm->vmcb->save.rip = vmcb12->save.rip; 411 svm->vmcb->save.dr7 = vmcb12->save.dr7 | DR7_FIXED_1; 412 svm->vcpu.arch.dr6 = vmcb12->save.dr6 | DR6_ACTIVE_LOW; 413 svm->vmcb->save.cpl = vmcb12->save.cpl; 414 } 415 416 static void nested_prepare_vmcb_control(struct vcpu_svm *svm) 417 { 418 const u32 mask = V_INTR_MASKING_MASK | V_GIF_ENABLE_MASK | V_GIF_MASK; 419 420 if (nested_npt_enabled(svm)) 421 nested_svm_init_mmu_context(&svm->vcpu); 422 423 svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset = 424 svm->vcpu.arch.l1_tsc_offset + svm->nested.ctl.tsc_offset; 425 426 svm->vmcb->control.int_ctl = 427 (svm->nested.ctl.int_ctl & ~mask) | 428 (svm->nested.hsave->control.int_ctl & mask); 429 430 svm->vmcb->control.virt_ext = svm->nested.ctl.virt_ext; 431 svm->vmcb->control.int_vector = svm->nested.ctl.int_vector; 432 svm->vmcb->control.int_state = svm->nested.ctl.int_state; 433 svm->vmcb->control.event_inj = svm->nested.ctl.event_inj; 434 svm->vmcb->control.event_inj_err = svm->nested.ctl.event_inj_err; 435 436 svm->vmcb->control.pause_filter_count = svm->nested.ctl.pause_filter_count; 437 svm->vmcb->control.pause_filter_thresh = svm->nested.ctl.pause_filter_thresh; 438 439 /* Enter Guest-Mode */ 440 enter_guest_mode(&svm->vcpu); 441 442 /* 443 * Merge guest and host intercepts - must be called with vcpu in 444 * guest-mode to take affect here 445 */ 446 recalc_intercepts(svm); 447 448 vmcb_mark_all_dirty(svm->vmcb); 449 } 450 451 int enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb12_gpa, 452 struct vmcb *vmcb12) 453 { 454 int ret; 455 456 trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb12_gpa, 457 vmcb12->save.rip, 458 vmcb12->control.int_ctl, 459 vmcb12->control.event_inj, 460 vmcb12->control.nested_ctl); 461 462 trace_kvm_nested_intercepts(vmcb12->control.intercepts[INTERCEPT_CR] & 0xffff, 463 vmcb12->control.intercepts[INTERCEPT_CR] >> 16, 464 vmcb12->control.intercepts[INTERCEPT_EXCEPTION], 465 vmcb12->control.intercepts[INTERCEPT_WORD3], 466 vmcb12->control.intercepts[INTERCEPT_WORD4], 467 vmcb12->control.intercepts[INTERCEPT_WORD5]); 468 469 470 svm->nested.vmcb12_gpa = vmcb12_gpa; 471 load_nested_vmcb_control(svm, &vmcb12->control); 472 nested_prepare_vmcb_control(svm); 473 nested_prepare_vmcb_save(svm, vmcb12); 474 475 ret = nested_svm_load_cr3(&svm->vcpu, vmcb12->save.cr3, 476 nested_npt_enabled(svm)); 477 if (ret) 478 return ret; 479 480 if (!npt_enabled) 481 svm->vcpu.arch.mmu->inject_page_fault = svm_inject_page_fault_nested; 482 483 svm_set_gif(svm, true); 484 485 return 0; 486 } 487 488 int nested_svm_vmrun(struct vcpu_svm *svm) 489 { 490 int ret; 491 struct vmcb *vmcb12; 492 struct vmcb *hsave = svm->nested.hsave; 493 struct vmcb *vmcb = svm->vmcb; 494 struct kvm_host_map map; 495 u64 vmcb12_gpa; 496 497 if (is_smm(&svm->vcpu)) { 498 kvm_queue_exception(&svm->vcpu, UD_VECTOR); 499 return 1; 500 } 501 502 vmcb12_gpa = svm->vmcb->save.rax; 503 ret = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(vmcb12_gpa), &map); 504 if (ret == -EINVAL) { 505 kvm_inject_gp(&svm->vcpu, 0); 506 return 1; 507 } else if (ret) { 508 return kvm_skip_emulated_instruction(&svm->vcpu); 509 } 510 511 ret = kvm_skip_emulated_instruction(&svm->vcpu); 512 513 vmcb12 = map.hva; 514 515 if (WARN_ON_ONCE(!svm->nested.initialized)) 516 return -EINVAL; 517 518 if (!nested_vmcb_checks(svm, vmcb12)) { 519 vmcb12->control.exit_code = SVM_EXIT_ERR; 520 vmcb12->control.exit_code_hi = 0; 521 vmcb12->control.exit_info_1 = 0; 522 vmcb12->control.exit_info_2 = 0; 523 goto out; 524 } 525 526 527 /* Clear internal status */ 528 kvm_clear_exception_queue(&svm->vcpu); 529 kvm_clear_interrupt_queue(&svm->vcpu); 530 531 /* 532 * Save the old vmcb, so we don't need to pick what we save, but can 533 * restore everything when a VMEXIT occurs 534 */ 535 hsave->save.es = vmcb->save.es; 536 hsave->save.cs = vmcb->save.cs; 537 hsave->save.ss = vmcb->save.ss; 538 hsave->save.ds = vmcb->save.ds; 539 hsave->save.gdtr = vmcb->save.gdtr; 540 hsave->save.idtr = vmcb->save.idtr; 541 hsave->save.efer = svm->vcpu.arch.efer; 542 hsave->save.cr0 = kvm_read_cr0(&svm->vcpu); 543 hsave->save.cr4 = svm->vcpu.arch.cr4; 544 hsave->save.rflags = kvm_get_rflags(&svm->vcpu); 545 hsave->save.rip = kvm_rip_read(&svm->vcpu); 546 hsave->save.rsp = vmcb->save.rsp; 547 hsave->save.rax = vmcb->save.rax; 548 if (npt_enabled) 549 hsave->save.cr3 = vmcb->save.cr3; 550 else 551 hsave->save.cr3 = kvm_read_cr3(&svm->vcpu); 552 553 copy_vmcb_control_area(&hsave->control, &vmcb->control); 554 555 svm->nested.nested_run_pending = 1; 556 557 if (enter_svm_guest_mode(svm, vmcb12_gpa, vmcb12)) 558 goto out_exit_err; 559 560 if (nested_svm_vmrun_msrpm(svm)) 561 goto out; 562 563 out_exit_err: 564 svm->nested.nested_run_pending = 0; 565 566 svm->vmcb->control.exit_code = SVM_EXIT_ERR; 567 svm->vmcb->control.exit_code_hi = 0; 568 svm->vmcb->control.exit_info_1 = 0; 569 svm->vmcb->control.exit_info_2 = 0; 570 571 nested_svm_vmexit(svm); 572 573 out: 574 kvm_vcpu_unmap(&svm->vcpu, &map, true); 575 576 return ret; 577 } 578 579 void nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb) 580 { 581 to_vmcb->save.fs = from_vmcb->save.fs; 582 to_vmcb->save.gs = from_vmcb->save.gs; 583 to_vmcb->save.tr = from_vmcb->save.tr; 584 to_vmcb->save.ldtr = from_vmcb->save.ldtr; 585 to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base; 586 to_vmcb->save.star = from_vmcb->save.star; 587 to_vmcb->save.lstar = from_vmcb->save.lstar; 588 to_vmcb->save.cstar = from_vmcb->save.cstar; 589 to_vmcb->save.sfmask = from_vmcb->save.sfmask; 590 to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs; 591 to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp; 592 to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip; 593 } 594 595 int nested_svm_vmexit(struct vcpu_svm *svm) 596 { 597 int rc; 598 struct vmcb *vmcb12; 599 struct vmcb *hsave = svm->nested.hsave; 600 struct vmcb *vmcb = svm->vmcb; 601 struct kvm_host_map map; 602 603 rc = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(svm->nested.vmcb12_gpa), &map); 604 if (rc) { 605 if (rc == -EINVAL) 606 kvm_inject_gp(&svm->vcpu, 0); 607 return 1; 608 } 609 610 vmcb12 = map.hva; 611 612 /* Exit Guest-Mode */ 613 leave_guest_mode(&svm->vcpu); 614 svm->nested.vmcb12_gpa = 0; 615 WARN_ON_ONCE(svm->nested.nested_run_pending); 616 617 kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, &svm->vcpu); 618 619 /* in case we halted in L2 */ 620 svm->vcpu.arch.mp_state = KVM_MP_STATE_RUNNABLE; 621 622 /* Give the current vmcb to the guest */ 623 624 vmcb12->save.es = vmcb->save.es; 625 vmcb12->save.cs = vmcb->save.cs; 626 vmcb12->save.ss = vmcb->save.ss; 627 vmcb12->save.ds = vmcb->save.ds; 628 vmcb12->save.gdtr = vmcb->save.gdtr; 629 vmcb12->save.idtr = vmcb->save.idtr; 630 vmcb12->save.efer = svm->vcpu.arch.efer; 631 vmcb12->save.cr0 = kvm_read_cr0(&svm->vcpu); 632 vmcb12->save.cr3 = kvm_read_cr3(&svm->vcpu); 633 vmcb12->save.cr2 = vmcb->save.cr2; 634 vmcb12->save.cr4 = svm->vcpu.arch.cr4; 635 vmcb12->save.rflags = kvm_get_rflags(&svm->vcpu); 636 vmcb12->save.rip = kvm_rip_read(&svm->vcpu); 637 vmcb12->save.rsp = kvm_rsp_read(&svm->vcpu); 638 vmcb12->save.rax = kvm_rax_read(&svm->vcpu); 639 vmcb12->save.dr7 = vmcb->save.dr7; 640 vmcb12->save.dr6 = svm->vcpu.arch.dr6; 641 vmcb12->save.cpl = vmcb->save.cpl; 642 643 vmcb12->control.int_state = vmcb->control.int_state; 644 vmcb12->control.exit_code = vmcb->control.exit_code; 645 vmcb12->control.exit_code_hi = vmcb->control.exit_code_hi; 646 vmcb12->control.exit_info_1 = vmcb->control.exit_info_1; 647 vmcb12->control.exit_info_2 = vmcb->control.exit_info_2; 648 649 if (vmcb12->control.exit_code != SVM_EXIT_ERR) 650 nested_vmcb_save_pending_event(svm, vmcb12); 651 652 if (svm->nrips_enabled) 653 vmcb12->control.next_rip = vmcb->control.next_rip; 654 655 vmcb12->control.int_ctl = svm->nested.ctl.int_ctl; 656 vmcb12->control.tlb_ctl = svm->nested.ctl.tlb_ctl; 657 vmcb12->control.event_inj = svm->nested.ctl.event_inj; 658 vmcb12->control.event_inj_err = svm->nested.ctl.event_inj_err; 659 660 vmcb12->control.pause_filter_count = 661 svm->vmcb->control.pause_filter_count; 662 vmcb12->control.pause_filter_thresh = 663 svm->vmcb->control.pause_filter_thresh; 664 665 /* Restore the original control entries */ 666 copy_vmcb_control_area(&vmcb->control, &hsave->control); 667 668 /* On vmexit the GIF is set to false */ 669 svm_set_gif(svm, false); 670 671 svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset = 672 svm->vcpu.arch.l1_tsc_offset; 673 674 svm->nested.ctl.nested_cr3 = 0; 675 676 /* Restore selected save entries */ 677 svm->vmcb->save.es = hsave->save.es; 678 svm->vmcb->save.cs = hsave->save.cs; 679 svm->vmcb->save.ss = hsave->save.ss; 680 svm->vmcb->save.ds = hsave->save.ds; 681 svm->vmcb->save.gdtr = hsave->save.gdtr; 682 svm->vmcb->save.idtr = hsave->save.idtr; 683 kvm_set_rflags(&svm->vcpu, hsave->save.rflags); 684 kvm_set_rflags(&svm->vcpu, hsave->save.rflags | X86_EFLAGS_FIXED); 685 svm_set_efer(&svm->vcpu, hsave->save.efer); 686 svm_set_cr0(&svm->vcpu, hsave->save.cr0 | X86_CR0_PE); 687 svm_set_cr4(&svm->vcpu, hsave->save.cr4); 688 kvm_rax_write(&svm->vcpu, hsave->save.rax); 689 kvm_rsp_write(&svm->vcpu, hsave->save.rsp); 690 kvm_rip_write(&svm->vcpu, hsave->save.rip); 691 svm->vmcb->save.dr7 = DR7_FIXED_1; 692 svm->vmcb->save.cpl = 0; 693 svm->vmcb->control.exit_int_info = 0; 694 695 vmcb_mark_all_dirty(svm->vmcb); 696 697 trace_kvm_nested_vmexit_inject(vmcb12->control.exit_code, 698 vmcb12->control.exit_info_1, 699 vmcb12->control.exit_info_2, 700 vmcb12->control.exit_int_info, 701 vmcb12->control.exit_int_info_err, 702 KVM_ISA_SVM); 703 704 kvm_vcpu_unmap(&svm->vcpu, &map, true); 705 706 nested_svm_uninit_mmu_context(&svm->vcpu); 707 708 rc = nested_svm_load_cr3(&svm->vcpu, hsave->save.cr3, false); 709 if (rc) 710 return 1; 711 712 if (npt_enabled) 713 svm->vmcb->save.cr3 = hsave->save.cr3; 714 715 /* 716 * Drop what we picked up for L2 via svm_complete_interrupts() so it 717 * doesn't end up in L1. 718 */ 719 svm->vcpu.arch.nmi_injected = false; 720 kvm_clear_exception_queue(&svm->vcpu); 721 kvm_clear_interrupt_queue(&svm->vcpu); 722 723 return 0; 724 } 725 726 int svm_allocate_nested(struct vcpu_svm *svm) 727 { 728 struct page *hsave_page; 729 730 if (svm->nested.initialized) 731 return 0; 732 733 hsave_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO); 734 if (!hsave_page) 735 return -ENOMEM; 736 svm->nested.hsave = page_address(hsave_page); 737 738 svm->nested.msrpm = svm_vcpu_alloc_msrpm(); 739 if (!svm->nested.msrpm) 740 goto err_free_hsave; 741 svm_vcpu_init_msrpm(&svm->vcpu, svm->nested.msrpm); 742 743 svm->nested.initialized = true; 744 return 0; 745 746 err_free_hsave: 747 __free_page(hsave_page); 748 return -ENOMEM; 749 } 750 751 void svm_free_nested(struct vcpu_svm *svm) 752 { 753 if (!svm->nested.initialized) 754 return; 755 756 svm_vcpu_free_msrpm(svm->nested.msrpm); 757 svm->nested.msrpm = NULL; 758 759 __free_page(virt_to_page(svm->nested.hsave)); 760 svm->nested.hsave = NULL; 761 762 svm->nested.initialized = false; 763 } 764 765 /* 766 * Forcibly leave nested mode in order to be able to reset the VCPU later on. 767 */ 768 void svm_leave_nested(struct vcpu_svm *svm) 769 { 770 if (is_guest_mode(&svm->vcpu)) { 771 struct vmcb *hsave = svm->nested.hsave; 772 struct vmcb *vmcb = svm->vmcb; 773 774 svm->nested.nested_run_pending = 0; 775 leave_guest_mode(&svm->vcpu); 776 copy_vmcb_control_area(&vmcb->control, &hsave->control); 777 nested_svm_uninit_mmu_context(&svm->vcpu); 778 vmcb_mark_all_dirty(svm->vmcb); 779 } 780 781 kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, &svm->vcpu); 782 } 783 784 static int nested_svm_exit_handled_msr(struct vcpu_svm *svm) 785 { 786 u32 offset, msr, value; 787 int write, mask; 788 789 if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT))) 790 return NESTED_EXIT_HOST; 791 792 msr = svm->vcpu.arch.regs[VCPU_REGS_RCX]; 793 offset = svm_msrpm_offset(msr); 794 write = svm->vmcb->control.exit_info_1 & 1; 795 mask = 1 << ((2 * (msr & 0xf)) + write); 796 797 if (offset == MSR_INVALID) 798 return NESTED_EXIT_DONE; 799 800 /* Offset is in 32 bit units but need in 8 bit units */ 801 offset *= 4; 802 803 if (kvm_vcpu_read_guest(&svm->vcpu, svm->nested.ctl.msrpm_base_pa + offset, &value, 4)) 804 return NESTED_EXIT_DONE; 805 806 return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST; 807 } 808 809 static int nested_svm_intercept_ioio(struct vcpu_svm *svm) 810 { 811 unsigned port, size, iopm_len; 812 u16 val, mask; 813 u8 start_bit; 814 u64 gpa; 815 816 if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_IOIO_PROT))) 817 return NESTED_EXIT_HOST; 818 819 port = svm->vmcb->control.exit_info_1 >> 16; 820 size = (svm->vmcb->control.exit_info_1 & SVM_IOIO_SIZE_MASK) >> 821 SVM_IOIO_SIZE_SHIFT; 822 gpa = svm->nested.ctl.iopm_base_pa + (port / 8); 823 start_bit = port % 8; 824 iopm_len = (start_bit + size > 8) ? 2 : 1; 825 mask = (0xf >> (4 - size)) << start_bit; 826 val = 0; 827 828 if (kvm_vcpu_read_guest(&svm->vcpu, gpa, &val, iopm_len)) 829 return NESTED_EXIT_DONE; 830 831 return (val & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST; 832 } 833 834 static int nested_svm_intercept(struct vcpu_svm *svm) 835 { 836 u32 exit_code = svm->vmcb->control.exit_code; 837 int vmexit = NESTED_EXIT_HOST; 838 839 switch (exit_code) { 840 case SVM_EXIT_MSR: 841 vmexit = nested_svm_exit_handled_msr(svm); 842 break; 843 case SVM_EXIT_IOIO: 844 vmexit = nested_svm_intercept_ioio(svm); 845 break; 846 case SVM_EXIT_READ_CR0 ... SVM_EXIT_WRITE_CR8: { 847 if (vmcb_is_intercept(&svm->nested.ctl, exit_code)) 848 vmexit = NESTED_EXIT_DONE; 849 break; 850 } 851 case SVM_EXIT_READ_DR0 ... SVM_EXIT_WRITE_DR7: { 852 if (vmcb_is_intercept(&svm->nested.ctl, exit_code)) 853 vmexit = NESTED_EXIT_DONE; 854 break; 855 } 856 case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: { 857 /* 858 * Host-intercepted exceptions have been checked already in 859 * nested_svm_exit_special. There is nothing to do here, 860 * the vmexit is injected by svm_check_nested_events. 861 */ 862 vmexit = NESTED_EXIT_DONE; 863 break; 864 } 865 case SVM_EXIT_ERR: { 866 vmexit = NESTED_EXIT_DONE; 867 break; 868 } 869 default: { 870 if (vmcb_is_intercept(&svm->nested.ctl, exit_code)) 871 vmexit = NESTED_EXIT_DONE; 872 } 873 } 874 875 return vmexit; 876 } 877 878 int nested_svm_exit_handled(struct vcpu_svm *svm) 879 { 880 int vmexit; 881 882 vmexit = nested_svm_intercept(svm); 883 884 if (vmexit == NESTED_EXIT_DONE) 885 nested_svm_vmexit(svm); 886 887 return vmexit; 888 } 889 890 int nested_svm_check_permissions(struct vcpu_svm *svm) 891 { 892 if (!(svm->vcpu.arch.efer & EFER_SVME) || 893 !is_paging(&svm->vcpu)) { 894 kvm_queue_exception(&svm->vcpu, UD_VECTOR); 895 return 1; 896 } 897 898 if (svm->vmcb->save.cpl) { 899 kvm_inject_gp(&svm->vcpu, 0); 900 return 1; 901 } 902 903 return 0; 904 } 905 906 static bool nested_exit_on_exception(struct vcpu_svm *svm) 907 { 908 unsigned int nr = svm->vcpu.arch.exception.nr; 909 910 return (svm->nested.ctl.intercepts[INTERCEPT_EXCEPTION] & BIT(nr)); 911 } 912 913 static void nested_svm_inject_exception_vmexit(struct vcpu_svm *svm) 914 { 915 unsigned int nr = svm->vcpu.arch.exception.nr; 916 917 svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr; 918 svm->vmcb->control.exit_code_hi = 0; 919 920 if (svm->vcpu.arch.exception.has_error_code) 921 svm->vmcb->control.exit_info_1 = svm->vcpu.arch.exception.error_code; 922 923 /* 924 * EXITINFO2 is undefined for all exception intercepts other 925 * than #PF. 926 */ 927 if (nr == PF_VECTOR) { 928 if (svm->vcpu.arch.exception.nested_apf) 929 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.apf.nested_apf_token; 930 else if (svm->vcpu.arch.exception.has_payload) 931 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.exception.payload; 932 else 933 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2; 934 } else if (nr == DB_VECTOR) { 935 /* See inject_pending_event. */ 936 kvm_deliver_exception_payload(&svm->vcpu); 937 if (svm->vcpu.arch.dr7 & DR7_GD) { 938 svm->vcpu.arch.dr7 &= ~DR7_GD; 939 kvm_update_dr7(&svm->vcpu); 940 } 941 } else 942 WARN_ON(svm->vcpu.arch.exception.has_payload); 943 944 nested_svm_vmexit(svm); 945 } 946 947 static void nested_svm_smi(struct vcpu_svm *svm) 948 { 949 svm->vmcb->control.exit_code = SVM_EXIT_SMI; 950 svm->vmcb->control.exit_info_1 = 0; 951 svm->vmcb->control.exit_info_2 = 0; 952 953 nested_svm_vmexit(svm); 954 } 955 956 static void nested_svm_nmi(struct vcpu_svm *svm) 957 { 958 svm->vmcb->control.exit_code = SVM_EXIT_NMI; 959 svm->vmcb->control.exit_info_1 = 0; 960 svm->vmcb->control.exit_info_2 = 0; 961 962 nested_svm_vmexit(svm); 963 } 964 965 static void nested_svm_intr(struct vcpu_svm *svm) 966 { 967 trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip); 968 969 svm->vmcb->control.exit_code = SVM_EXIT_INTR; 970 svm->vmcb->control.exit_info_1 = 0; 971 svm->vmcb->control.exit_info_2 = 0; 972 973 nested_svm_vmexit(svm); 974 } 975 976 static inline bool nested_exit_on_init(struct vcpu_svm *svm) 977 { 978 return vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_INIT); 979 } 980 981 static void nested_svm_init(struct vcpu_svm *svm) 982 { 983 svm->vmcb->control.exit_code = SVM_EXIT_INIT; 984 svm->vmcb->control.exit_info_1 = 0; 985 svm->vmcb->control.exit_info_2 = 0; 986 987 nested_svm_vmexit(svm); 988 } 989 990 991 static int svm_check_nested_events(struct kvm_vcpu *vcpu) 992 { 993 struct vcpu_svm *svm = to_svm(vcpu); 994 bool block_nested_events = 995 kvm_event_needs_reinjection(vcpu) || svm->nested.nested_run_pending; 996 struct kvm_lapic *apic = vcpu->arch.apic; 997 998 if (lapic_in_kernel(vcpu) && 999 test_bit(KVM_APIC_INIT, &apic->pending_events)) { 1000 if (block_nested_events) 1001 return -EBUSY; 1002 if (!nested_exit_on_init(svm)) 1003 return 0; 1004 nested_svm_init(svm); 1005 return 0; 1006 } 1007 1008 if (vcpu->arch.exception.pending) { 1009 if (block_nested_events) 1010 return -EBUSY; 1011 if (!nested_exit_on_exception(svm)) 1012 return 0; 1013 nested_svm_inject_exception_vmexit(svm); 1014 return 0; 1015 } 1016 1017 if (vcpu->arch.smi_pending && !svm_smi_blocked(vcpu)) { 1018 if (block_nested_events) 1019 return -EBUSY; 1020 if (!nested_exit_on_smi(svm)) 1021 return 0; 1022 nested_svm_smi(svm); 1023 return 0; 1024 } 1025 1026 if (vcpu->arch.nmi_pending && !svm_nmi_blocked(vcpu)) { 1027 if (block_nested_events) 1028 return -EBUSY; 1029 if (!nested_exit_on_nmi(svm)) 1030 return 0; 1031 nested_svm_nmi(svm); 1032 return 0; 1033 } 1034 1035 if (kvm_cpu_has_interrupt(vcpu) && !svm_interrupt_blocked(vcpu)) { 1036 if (block_nested_events) 1037 return -EBUSY; 1038 if (!nested_exit_on_intr(svm)) 1039 return 0; 1040 nested_svm_intr(svm); 1041 return 0; 1042 } 1043 1044 return 0; 1045 } 1046 1047 int nested_svm_exit_special(struct vcpu_svm *svm) 1048 { 1049 u32 exit_code = svm->vmcb->control.exit_code; 1050 1051 switch (exit_code) { 1052 case SVM_EXIT_INTR: 1053 case SVM_EXIT_NMI: 1054 case SVM_EXIT_NPF: 1055 return NESTED_EXIT_HOST; 1056 case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: { 1057 u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE); 1058 1059 if (get_host_vmcb(svm)->control.intercepts[INTERCEPT_EXCEPTION] & 1060 excp_bits) 1061 return NESTED_EXIT_HOST; 1062 else if (exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR && 1063 svm->vcpu.arch.apf.host_apf_flags) 1064 /* Trap async PF even if not shadowing */ 1065 return NESTED_EXIT_HOST; 1066 break; 1067 } 1068 default: 1069 break; 1070 } 1071 1072 return NESTED_EXIT_CONTINUE; 1073 } 1074 1075 static int svm_get_nested_state(struct kvm_vcpu *vcpu, 1076 struct kvm_nested_state __user *user_kvm_nested_state, 1077 u32 user_data_size) 1078 { 1079 struct vcpu_svm *svm; 1080 struct kvm_nested_state kvm_state = { 1081 .flags = 0, 1082 .format = KVM_STATE_NESTED_FORMAT_SVM, 1083 .size = sizeof(kvm_state), 1084 }; 1085 struct vmcb __user *user_vmcb = (struct vmcb __user *) 1086 &user_kvm_nested_state->data.svm[0]; 1087 1088 if (!vcpu) 1089 return kvm_state.size + KVM_STATE_NESTED_SVM_VMCB_SIZE; 1090 1091 svm = to_svm(vcpu); 1092 1093 if (user_data_size < kvm_state.size) 1094 goto out; 1095 1096 /* First fill in the header and copy it out. */ 1097 if (is_guest_mode(vcpu)) { 1098 kvm_state.hdr.svm.vmcb_pa = svm->nested.vmcb12_gpa; 1099 kvm_state.size += KVM_STATE_NESTED_SVM_VMCB_SIZE; 1100 kvm_state.flags |= KVM_STATE_NESTED_GUEST_MODE; 1101 1102 if (svm->nested.nested_run_pending) 1103 kvm_state.flags |= KVM_STATE_NESTED_RUN_PENDING; 1104 } 1105 1106 if (gif_set(svm)) 1107 kvm_state.flags |= KVM_STATE_NESTED_GIF_SET; 1108 1109 if (copy_to_user(user_kvm_nested_state, &kvm_state, sizeof(kvm_state))) 1110 return -EFAULT; 1111 1112 if (!is_guest_mode(vcpu)) 1113 goto out; 1114 1115 /* 1116 * Copy over the full size of the VMCB rather than just the size 1117 * of the structs. 1118 */ 1119 if (clear_user(user_vmcb, KVM_STATE_NESTED_SVM_VMCB_SIZE)) 1120 return -EFAULT; 1121 if (copy_to_user(&user_vmcb->control, &svm->nested.ctl, 1122 sizeof(user_vmcb->control))) 1123 return -EFAULT; 1124 if (copy_to_user(&user_vmcb->save, &svm->nested.hsave->save, 1125 sizeof(user_vmcb->save))) 1126 return -EFAULT; 1127 1128 out: 1129 return kvm_state.size; 1130 } 1131 1132 static int svm_set_nested_state(struct kvm_vcpu *vcpu, 1133 struct kvm_nested_state __user *user_kvm_nested_state, 1134 struct kvm_nested_state *kvm_state) 1135 { 1136 struct vcpu_svm *svm = to_svm(vcpu); 1137 struct vmcb *hsave = svm->nested.hsave; 1138 struct vmcb __user *user_vmcb = (struct vmcb __user *) 1139 &user_kvm_nested_state->data.svm[0]; 1140 struct vmcb_control_area *ctl; 1141 struct vmcb_save_area *save; 1142 int ret; 1143 u32 cr0; 1144 1145 BUILD_BUG_ON(sizeof(struct vmcb_control_area) + sizeof(struct vmcb_save_area) > 1146 KVM_STATE_NESTED_SVM_VMCB_SIZE); 1147 1148 if (kvm_state->format != KVM_STATE_NESTED_FORMAT_SVM) 1149 return -EINVAL; 1150 1151 if (kvm_state->flags & ~(KVM_STATE_NESTED_GUEST_MODE | 1152 KVM_STATE_NESTED_RUN_PENDING | 1153 KVM_STATE_NESTED_GIF_SET)) 1154 return -EINVAL; 1155 1156 /* 1157 * If in guest mode, vcpu->arch.efer actually refers to the L2 guest's 1158 * EFER.SVME, but EFER.SVME still has to be 1 for VMRUN to succeed. 1159 */ 1160 if (!(vcpu->arch.efer & EFER_SVME)) { 1161 /* GIF=1 and no guest mode are required if SVME=0. */ 1162 if (kvm_state->flags != KVM_STATE_NESTED_GIF_SET) 1163 return -EINVAL; 1164 } 1165 1166 /* SMM temporarily disables SVM, so we cannot be in guest mode. */ 1167 if (is_smm(vcpu) && (kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE)) 1168 return -EINVAL; 1169 1170 if (!(kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE)) { 1171 svm_leave_nested(svm); 1172 svm_set_gif(svm, !!(kvm_state->flags & KVM_STATE_NESTED_GIF_SET)); 1173 return 0; 1174 } 1175 1176 if (!page_address_valid(vcpu, kvm_state->hdr.svm.vmcb_pa)) 1177 return -EINVAL; 1178 if (kvm_state->size < sizeof(*kvm_state) + KVM_STATE_NESTED_SVM_VMCB_SIZE) 1179 return -EINVAL; 1180 1181 ret = -ENOMEM; 1182 ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); 1183 save = kzalloc(sizeof(*save), GFP_KERNEL); 1184 if (!ctl || !save) 1185 goto out_free; 1186 1187 ret = -EFAULT; 1188 if (copy_from_user(ctl, &user_vmcb->control, sizeof(*ctl))) 1189 goto out_free; 1190 if (copy_from_user(save, &user_vmcb->save, sizeof(*save))) 1191 goto out_free; 1192 1193 ret = -EINVAL; 1194 if (!nested_vmcb_check_controls(ctl)) 1195 goto out_free; 1196 1197 /* 1198 * Processor state contains L2 state. Check that it is 1199 * valid for guest mode (see nested_vmcb_checks). 1200 */ 1201 cr0 = kvm_read_cr0(vcpu); 1202 if (((cr0 & X86_CR0_CD) == 0) && (cr0 & X86_CR0_NW)) 1203 goto out_free; 1204 1205 /* 1206 * Validate host state saved from before VMRUN (see 1207 * nested_svm_check_permissions). 1208 * TODO: validate reserved bits for all saved state. 1209 */ 1210 if (!(save->cr0 & X86_CR0_PG)) 1211 goto out_free; 1212 1213 /* 1214 * All checks done, we can enter guest mode. L1 control fields 1215 * come from the nested save state. Guest state is already 1216 * in the registers, the save area of the nested state instead 1217 * contains saved L1 state. 1218 */ 1219 1220 svm->nested.nested_run_pending = 1221 !!(kvm_state->flags & KVM_STATE_NESTED_RUN_PENDING); 1222 1223 copy_vmcb_control_area(&hsave->control, &svm->vmcb->control); 1224 hsave->save = *save; 1225 1226 svm->nested.vmcb12_gpa = kvm_state->hdr.svm.vmcb_pa; 1227 load_nested_vmcb_control(svm, ctl); 1228 nested_prepare_vmcb_control(svm); 1229 1230 kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu); 1231 ret = 0; 1232 out_free: 1233 kfree(save); 1234 kfree(ctl); 1235 1236 return ret; 1237 } 1238 1239 struct kvm_x86_nested_ops svm_nested_ops = { 1240 .check_events = svm_check_nested_events, 1241 .get_nested_state_pages = svm_get_nested_state_pages, 1242 .get_state = svm_get_nested_state, 1243 .set_state = svm_set_nested_state, 1244 }; 1245