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 32static 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 54static 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 71static 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 85static 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 92static 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 109static 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 115void 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 vmcb_set_intercept(c, INTERCEPT_VMLOAD); 152 vmcb_set_intercept(c, INTERCEPT_VMSAVE); 153} 154 155static void copy_vmcb_control_area(struct vmcb_control_area *dst, 156 struct vmcb_control_area *from) 157{ 158 unsigned int i; 159 160 for (i = 0; i < MAX_INTERCEPT; i++) 161 dst->intercepts[i] = from->intercepts[i]; 162 163 dst->iopm_base_pa = from->iopm_base_pa; 164 dst->msrpm_base_pa = from->msrpm_base_pa; 165 dst->tsc_offset = from->tsc_offset; 166 /* asid not copied, it is handled manually for svm->vmcb. */ 167 dst->tlb_ctl = from->tlb_ctl; 168 dst->int_ctl = from->int_ctl; 169 dst->int_vector = from->int_vector; 170 dst->int_state = from->int_state; 171 dst->exit_code = from->exit_code; 172 dst->exit_code_hi = from->exit_code_hi; 173 dst->exit_info_1 = from->exit_info_1; 174 dst->exit_info_2 = from->exit_info_2; 175 dst->exit_int_info = from->exit_int_info; 176 dst->exit_int_info_err = from->exit_int_info_err; 177 dst->nested_ctl = from->nested_ctl; 178 dst->event_inj = from->event_inj; 179 dst->event_inj_err = from->event_inj_err; 180 dst->nested_cr3 = from->nested_cr3; 181 dst->virt_ext = from->virt_ext; 182 dst->pause_filter_count = from->pause_filter_count; 183 dst->pause_filter_thresh = from->pause_filter_thresh; 184} 185 186static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm) 187{ 188 /* 189 * This function merges the msr permission bitmaps of kvm and the 190 * nested vmcb. It is optimized in that it only merges the parts where 191 * the kvm msr permission bitmap may contain zero bits 192 */ 193 int i; 194 195 if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT))) 196 return true; 197 198 for (i = 0; i < MSRPM_OFFSETS; i++) { 199 u32 value, p; 200 u64 offset; 201 202 if (msrpm_offsets[i] == 0xffffffff) 203 break; 204 205 p = msrpm_offsets[i]; 206 offset = svm->nested.ctl.msrpm_base_pa + (p * 4); 207 208 if (kvm_vcpu_read_guest(&svm->vcpu, offset, &value, 4)) 209 return false; 210 211 svm->nested.msrpm[p] = svm->msrpm[p] | value; 212 } 213 214 svm->vmcb->control.msrpm_base_pa = __sme_set(__pa(svm->nested.msrpm)); 215 216 return true; 217} 218 219static bool svm_get_nested_state_pages(struct kvm_vcpu *vcpu) 220{ 221 struct vcpu_svm *svm = to_svm(vcpu); 222 223 if (WARN_ON(!is_guest_mode(vcpu))) 224 return true; 225 226 if (!nested_svm_vmrun_msrpm(svm)) { 227 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 228 vcpu->run->internal.suberror = 229 KVM_INTERNAL_ERROR_EMULATION; 230 vcpu->run->internal.ndata = 0; 231 return false; 232 } 233 234 return true; 235} 236 237static bool nested_vmcb_check_controls(struct vmcb_control_area *control) 238{ 239 if ((vmcb_is_intercept(control, INTERCEPT_VMRUN)) == 0) 240 return false; 241 242 if (control->asid == 0) 243 return false; 244 245 if ((control->nested_ctl & SVM_NESTED_CTL_NP_ENABLE) && 246 !npt_enabled) 247 return false; 248 249 return true; 250} 251 252static bool nested_vmcb_check_save(struct vcpu_svm *svm, struct vmcb *vmcb12) 253{ 254 struct kvm_vcpu *vcpu = &svm->vcpu; 255 bool vmcb12_lma; 256 257 /* 258 * FIXME: these should be done after copying the fields, 259 * to avoid TOC/TOU races. For these save area checks 260 * the possible damage is limited since kvm_set_cr0 and 261 * kvm_set_cr4 handle failure; EFER_SVME is an exception 262 * so it is force-set later in nested_prepare_vmcb_save. 263 */ 264 if ((vmcb12->save.efer & EFER_SVME) == 0) 265 return false; 266 267 if (((vmcb12->save.cr0 & X86_CR0_CD) == 0) && (vmcb12->save.cr0 & X86_CR0_NW)) 268 return false; 269 270 if (!kvm_dr6_valid(vmcb12->save.dr6) || !kvm_dr7_valid(vmcb12->save.dr7)) 271 return false; 272 273 vmcb12_lma = (vmcb12->save.efer & EFER_LME) && (vmcb12->save.cr0 & X86_CR0_PG); 274 275 if (vmcb12_lma) { 276 if (!(vmcb12->save.cr4 & X86_CR4_PAE) || 277 !(vmcb12->save.cr0 & X86_CR0_PE) || 278 (vmcb12->save.cr3 & vcpu->arch.cr3_lm_rsvd_bits)) 279 return false; 280 } 281 if (kvm_valid_cr4(&svm->vcpu, vmcb12->save.cr4)) 282 return false; 283 284 return true; 285} 286 287static void load_nested_vmcb_control(struct vcpu_svm *svm, 288 struct vmcb_control_area *control) 289{ 290 copy_vmcb_control_area(&svm->nested.ctl, control); 291 292 /* Copy it here because nested_svm_check_controls will check it. */ 293 svm->nested.ctl.asid = control->asid; 294 svm->nested.ctl.msrpm_base_pa &= ~0x0fffULL; 295 svm->nested.ctl.iopm_base_pa &= ~0x0fffULL; 296} 297 298/* 299 * Synchronize fields that are written by the processor, so that 300 * they can be copied back into the nested_vmcb. 301 */ 302void sync_nested_vmcb_control(struct vcpu_svm *svm) 303{ 304 u32 mask; 305 svm->nested.ctl.event_inj = svm->vmcb->control.event_inj; 306 svm->nested.ctl.event_inj_err = svm->vmcb->control.event_inj_err; 307 308 /* Only a few fields of int_ctl are written by the processor. */ 309 mask = V_IRQ_MASK | V_TPR_MASK; 310 if (!(svm->nested.ctl.int_ctl & V_INTR_MASKING_MASK) && 311 svm_is_intercept(svm, INTERCEPT_VINTR)) { 312 /* 313 * In order to request an interrupt window, L0 is usurping 314 * svm->vmcb->control.int_ctl and possibly setting V_IRQ 315 * even if it was clear in L1's VMCB. Restoring it would be 316 * wrong. However, in this case V_IRQ will remain true until 317 * interrupt_window_interception calls svm_clear_vintr and 318 * restores int_ctl. We can just leave it aside. 319 */ 320 mask &= ~V_IRQ_MASK; 321 } 322 svm->nested.ctl.int_ctl &= ~mask; 323 svm->nested.ctl.int_ctl |= svm->vmcb->control.int_ctl & mask; 324} 325 326/* 327 * Transfer any event that L0 or L1 wanted to inject into L2 to 328 * EXIT_INT_INFO. 329 */ 330static void nested_vmcb_save_pending_event(struct vcpu_svm *svm, 331 struct vmcb *vmcb12) 332{ 333 struct kvm_vcpu *vcpu = &svm->vcpu; 334 u32 exit_int_info = 0; 335 unsigned int nr; 336 337 if (vcpu->arch.exception.injected) { 338 nr = vcpu->arch.exception.nr; 339 exit_int_info = nr | SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_EXEPT; 340 341 if (vcpu->arch.exception.has_error_code) { 342 exit_int_info |= SVM_EVTINJ_VALID_ERR; 343 vmcb12->control.exit_int_info_err = 344 vcpu->arch.exception.error_code; 345 } 346 347 } else if (vcpu->arch.nmi_injected) { 348 exit_int_info = SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_NMI; 349 350 } else if (vcpu->arch.interrupt.injected) { 351 nr = vcpu->arch.interrupt.nr; 352 exit_int_info = nr | SVM_EVTINJ_VALID; 353 354 if (vcpu->arch.interrupt.soft) 355 exit_int_info |= SVM_EVTINJ_TYPE_SOFT; 356 else 357 exit_int_info |= SVM_EVTINJ_TYPE_INTR; 358 } 359 360 vmcb12->control.exit_int_info = exit_int_info; 361} 362 363static inline bool nested_npt_enabled(struct vcpu_svm *svm) 364{ 365 return svm->nested.ctl.nested_ctl & SVM_NESTED_CTL_NP_ENABLE; 366} 367 368/* 369 * Load guest's/host's cr3 on nested vmentry or vmexit. @nested_npt is true 370 * if we are emulating VM-Entry into a guest with NPT enabled. 371 */ 372static int nested_svm_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3, 373 bool nested_npt) 374{ 375 if (cr3 & rsvd_bits(cpuid_maxphyaddr(vcpu), 63)) 376 return -EINVAL; 377 378 if (!nested_npt && is_pae_paging(vcpu) && 379 (cr3 != kvm_read_cr3(vcpu) || pdptrs_changed(vcpu))) { 380 if (!load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3)) 381 return -EINVAL; 382 } 383 384 /* 385 * TODO: optimize unconditional TLB flush/MMU sync here and in 386 * kvm_init_shadow_npt_mmu(). 387 */ 388 if (!nested_npt) 389 kvm_mmu_new_pgd(vcpu, cr3, false, false); 390 391 vcpu->arch.cr3 = cr3; 392 kvm_register_mark_available(vcpu, VCPU_EXREG_CR3); 393 394 kvm_init_mmu(vcpu, false); 395 396 return 0; 397} 398 399static void nested_prepare_vmcb_save(struct vcpu_svm *svm, struct vmcb *vmcb12) 400{ 401 /* Load the nested guest state */ 402 svm->vmcb->save.es = vmcb12->save.es; 403 svm->vmcb->save.cs = vmcb12->save.cs; 404 svm->vmcb->save.ss = vmcb12->save.ss; 405 svm->vmcb->save.ds = vmcb12->save.ds; 406 svm->vmcb->save.gdtr = vmcb12->save.gdtr; 407 svm->vmcb->save.idtr = vmcb12->save.idtr; 408 kvm_set_rflags(&svm->vcpu, vmcb12->save.rflags); 409 410 /* 411 * Force-set EFER_SVME even though it is checked earlier on the 412 * VMCB12, because the guest can flip the bit between the check 413 * and now. Clearing EFER_SVME would call svm_free_nested. 414 */ 415 svm_set_efer(&svm->vcpu, vmcb12->save.efer | EFER_SVME); 416 417 svm_set_cr0(&svm->vcpu, vmcb12->save.cr0); 418 svm_set_cr4(&svm->vcpu, vmcb12->save.cr4); 419 svm->vmcb->save.cr2 = svm->vcpu.arch.cr2 = vmcb12->save.cr2; 420 kvm_rax_write(&svm->vcpu, vmcb12->save.rax); 421 kvm_rsp_write(&svm->vcpu, vmcb12->save.rsp); 422 kvm_rip_write(&svm->vcpu, vmcb12->save.rip); 423 424 /* In case we don't even reach vcpu_run, the fields are not updated */ 425 svm->vmcb->save.rax = vmcb12->save.rax; 426 svm->vmcb->save.rsp = vmcb12->save.rsp; 427 svm->vmcb->save.rip = vmcb12->save.rip; 428 svm->vmcb->save.dr7 = vmcb12->save.dr7; 429 svm->vcpu.arch.dr6 = vmcb12->save.dr6; 430 svm->vmcb->save.cpl = vmcb12->save.cpl; 431} 432 433static void nested_prepare_vmcb_control(struct vcpu_svm *svm) 434{ 435 const u32 int_ctl_vmcb01_bits = 436 V_INTR_MASKING_MASK | V_GIF_MASK | V_GIF_ENABLE_MASK; 437 438 const u32 int_ctl_vmcb12_bits = V_TPR_MASK | V_IRQ_INJECTION_BITS_MASK; 439 440 if (nested_npt_enabled(svm)) 441 nested_svm_init_mmu_context(&svm->vcpu); 442 443 svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset = 444 svm->vcpu.arch.l1_tsc_offset + svm->nested.ctl.tsc_offset; 445 446 svm->vmcb->control.int_ctl = 447 (svm->nested.ctl.int_ctl & int_ctl_vmcb12_bits) | 448 (svm->nested.hsave->control.int_ctl & int_ctl_vmcb01_bits); 449 450 svm->vmcb->control.int_vector = svm->nested.ctl.int_vector; 451 svm->vmcb->control.int_state = svm->nested.ctl.int_state; 452 svm->vmcb->control.event_inj = svm->nested.ctl.event_inj; 453 svm->vmcb->control.event_inj_err = svm->nested.ctl.event_inj_err; 454 455 svm->vmcb->control.pause_filter_count = svm->nested.ctl.pause_filter_count; 456 svm->vmcb->control.pause_filter_thresh = svm->nested.ctl.pause_filter_thresh; 457 458 /* Enter Guest-Mode */ 459 enter_guest_mode(&svm->vcpu); 460 461 /* 462 * Merge guest and host intercepts - must be called with vcpu in 463 * guest-mode to take affect here 464 */ 465 recalc_intercepts(svm); 466 467 vmcb_mark_all_dirty(svm->vmcb); 468} 469 470int enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb12_gpa, 471 struct vmcb *vmcb12) 472{ 473 int ret; 474 475 svm->nested.vmcb12_gpa = vmcb12_gpa; 476 nested_prepare_vmcb_save(svm, vmcb12); 477 nested_prepare_vmcb_control(svm); 478 479 ret = nested_svm_load_cr3(&svm->vcpu, vmcb12->save.cr3, 480 nested_npt_enabled(svm)); 481 if (ret) 482 return ret; 483 484 if (!npt_enabled) 485 svm->vcpu.arch.mmu->inject_page_fault = svm_inject_page_fault_nested; 486 487 svm_set_gif(svm, true); 488 489 return 0; 490} 491 492int nested_svm_vmrun(struct vcpu_svm *svm) 493{ 494 int ret; 495 struct vmcb *vmcb12; 496 struct vmcb *hsave = svm->nested.hsave; 497 struct vmcb *vmcb = svm->vmcb; 498 struct kvm_host_map map; 499 u64 vmcb12_gpa; 500 501 if (is_smm(&svm->vcpu)) { 502 kvm_queue_exception(&svm->vcpu, UD_VECTOR); 503 return 1; 504 } 505 506 vmcb12_gpa = svm->vmcb->save.rax; 507 ret = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(vmcb12_gpa), &map); 508 if (ret == -EINVAL) { 509 kvm_inject_gp(&svm->vcpu, 0); 510 return 1; 511 } else if (ret) { 512 return kvm_skip_emulated_instruction(&svm->vcpu); 513 } 514 515 ret = kvm_skip_emulated_instruction(&svm->vcpu); 516 517 vmcb12 = map.hva; 518 519 if (WARN_ON_ONCE(!svm->nested.initialized)) 520 return -EINVAL; 521 522 load_nested_vmcb_control(svm, &vmcb12->control); 523 524 if (!nested_vmcb_check_save(svm, vmcb12) || 525 !nested_vmcb_check_controls(&svm->nested.ctl)) { 526 vmcb12->control.exit_code = SVM_EXIT_ERR; 527 vmcb12->control.exit_code_hi = 0; 528 vmcb12->control.exit_info_1 = 0; 529 vmcb12->control.exit_info_2 = 0; 530 goto out; 531 } 532 533 trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb12_gpa, 534 vmcb12->save.rip, 535 vmcb12->control.int_ctl, 536 vmcb12->control.event_inj, 537 vmcb12->control.nested_ctl); 538 539 trace_kvm_nested_intercepts(vmcb12->control.intercepts[INTERCEPT_CR] & 0xffff, 540 vmcb12->control.intercepts[INTERCEPT_CR] >> 16, 541 vmcb12->control.intercepts[INTERCEPT_EXCEPTION], 542 vmcb12->control.intercepts[INTERCEPT_WORD3], 543 vmcb12->control.intercepts[INTERCEPT_WORD4], 544 vmcb12->control.intercepts[INTERCEPT_WORD5]); 545 546 /* Clear internal status */ 547 kvm_clear_exception_queue(&svm->vcpu); 548 kvm_clear_interrupt_queue(&svm->vcpu); 549 550 /* 551 * Save the old vmcb, so we don't need to pick what we save, but can 552 * restore everything when a VMEXIT occurs 553 */ 554 hsave->save.es = vmcb->save.es; 555 hsave->save.cs = vmcb->save.cs; 556 hsave->save.ss = vmcb->save.ss; 557 hsave->save.ds = vmcb->save.ds; 558 hsave->save.gdtr = vmcb->save.gdtr; 559 hsave->save.idtr = vmcb->save.idtr; 560 hsave->save.efer = svm->vcpu.arch.efer; 561 hsave->save.cr0 = kvm_read_cr0(&svm->vcpu); 562 hsave->save.cr4 = svm->vcpu.arch.cr4; 563 hsave->save.rflags = kvm_get_rflags(&svm->vcpu); 564 hsave->save.rip = kvm_rip_read(&svm->vcpu); 565 hsave->save.rsp = vmcb->save.rsp; 566 hsave->save.rax = vmcb->save.rax; 567 if (npt_enabled) 568 hsave->save.cr3 = vmcb->save.cr3; 569 else 570 hsave->save.cr3 = kvm_read_cr3(&svm->vcpu); 571 572 copy_vmcb_control_area(&hsave->control, &vmcb->control); 573 574 svm->nested.nested_run_pending = 1; 575 576 if (enter_svm_guest_mode(svm, vmcb12_gpa, vmcb12)) 577 goto out_exit_err; 578 579 if (nested_svm_vmrun_msrpm(svm)) 580 goto out; 581 582out_exit_err: 583 svm->nested.nested_run_pending = 0; 584 585 svm->vmcb->control.exit_code = SVM_EXIT_ERR; 586 svm->vmcb->control.exit_code_hi = 0; 587 svm->vmcb->control.exit_info_1 = 0; 588 svm->vmcb->control.exit_info_2 = 0; 589 590 nested_svm_vmexit(svm); 591 592out: 593 kvm_vcpu_unmap(&svm->vcpu, &map, true); 594 595 return ret; 596} 597 598void nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb) 599{ 600 to_vmcb->save.fs = from_vmcb->save.fs; 601 to_vmcb->save.gs = from_vmcb->save.gs; 602 to_vmcb->save.tr = from_vmcb->save.tr; 603 to_vmcb->save.ldtr = from_vmcb->save.ldtr; 604 to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base; 605 to_vmcb->save.star = from_vmcb->save.star; 606 to_vmcb->save.lstar = from_vmcb->save.lstar; 607 to_vmcb->save.cstar = from_vmcb->save.cstar; 608 to_vmcb->save.sfmask = from_vmcb->save.sfmask; 609 to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs; 610 to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp; 611 to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip; 612} 613 614int nested_svm_vmexit(struct vcpu_svm *svm) 615{ 616 int rc; 617 struct vmcb *vmcb12; 618 struct vmcb *hsave = svm->nested.hsave; 619 struct vmcb *vmcb = svm->vmcb; 620 struct kvm_host_map map; 621 622 rc = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(svm->nested.vmcb12_gpa), &map); 623 if (rc) { 624 if (rc == -EINVAL) 625 kvm_inject_gp(&svm->vcpu, 0); 626 return 1; 627 } 628 629 vmcb12 = map.hva; 630 631 /* Exit Guest-Mode */ 632 leave_guest_mode(&svm->vcpu); 633 svm->nested.vmcb12_gpa = 0; 634 WARN_ON_ONCE(svm->nested.nested_run_pending); 635 636 kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, &svm->vcpu); 637 638 /* in case we halted in L2 */ 639 svm->vcpu.arch.mp_state = KVM_MP_STATE_RUNNABLE; 640 641 /* Give the current vmcb to the guest */ 642 643 vmcb12->save.es = vmcb->save.es; 644 vmcb12->save.cs = vmcb->save.cs; 645 vmcb12->save.ss = vmcb->save.ss; 646 vmcb12->save.ds = vmcb->save.ds; 647 vmcb12->save.gdtr = vmcb->save.gdtr; 648 vmcb12->save.idtr = vmcb->save.idtr; 649 vmcb12->save.efer = svm->vcpu.arch.efer; 650 vmcb12->save.cr0 = kvm_read_cr0(&svm->vcpu); 651 vmcb12->save.cr3 = kvm_read_cr3(&svm->vcpu); 652 vmcb12->save.cr2 = vmcb->save.cr2; 653 vmcb12->save.cr4 = svm->vcpu.arch.cr4; 654 vmcb12->save.rflags = kvm_get_rflags(&svm->vcpu); 655 vmcb12->save.rip = kvm_rip_read(&svm->vcpu); 656 vmcb12->save.rsp = kvm_rsp_read(&svm->vcpu); 657 vmcb12->save.rax = kvm_rax_read(&svm->vcpu); 658 vmcb12->save.dr7 = vmcb->save.dr7; 659 vmcb12->save.dr6 = svm->vcpu.arch.dr6; 660 vmcb12->save.cpl = vmcb->save.cpl; 661 662 vmcb12->control.int_state = vmcb->control.int_state; 663 vmcb12->control.exit_code = vmcb->control.exit_code; 664 vmcb12->control.exit_code_hi = vmcb->control.exit_code_hi; 665 vmcb12->control.exit_info_1 = vmcb->control.exit_info_1; 666 vmcb12->control.exit_info_2 = vmcb->control.exit_info_2; 667 668 if (vmcb12->control.exit_code != SVM_EXIT_ERR) 669 nested_vmcb_save_pending_event(svm, vmcb12); 670 671 if (svm->nrips_enabled) 672 vmcb12->control.next_rip = vmcb->control.next_rip; 673 674 vmcb12->control.int_ctl = svm->nested.ctl.int_ctl; 675 vmcb12->control.tlb_ctl = svm->nested.ctl.tlb_ctl; 676 vmcb12->control.event_inj = svm->nested.ctl.event_inj; 677 vmcb12->control.event_inj_err = svm->nested.ctl.event_inj_err; 678 679 vmcb12->control.pause_filter_count = 680 svm->vmcb->control.pause_filter_count; 681 vmcb12->control.pause_filter_thresh = 682 svm->vmcb->control.pause_filter_thresh; 683 684 /* Restore the original control entries */ 685 copy_vmcb_control_area(&vmcb->control, &hsave->control); 686 687 /* On vmexit the GIF is set to false */ 688 svm_set_gif(svm, false); 689 690 svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset = 691 svm->vcpu.arch.l1_tsc_offset; 692 693 svm->nested.ctl.nested_cr3 = 0; 694 695 /* Restore selected save entries */ 696 svm->vmcb->save.es = hsave->save.es; 697 svm->vmcb->save.cs = hsave->save.cs; 698 svm->vmcb->save.ss = hsave->save.ss; 699 svm->vmcb->save.ds = hsave->save.ds; 700 svm->vmcb->save.gdtr = hsave->save.gdtr; 701 svm->vmcb->save.idtr = hsave->save.idtr; 702 kvm_set_rflags(&svm->vcpu, hsave->save.rflags); 703 svm_set_efer(&svm->vcpu, hsave->save.efer); 704 svm_set_cr0(&svm->vcpu, hsave->save.cr0 | X86_CR0_PE); 705 svm_set_cr4(&svm->vcpu, hsave->save.cr4); 706 kvm_rax_write(&svm->vcpu, hsave->save.rax); 707 kvm_rsp_write(&svm->vcpu, hsave->save.rsp); 708 kvm_rip_write(&svm->vcpu, hsave->save.rip); 709 svm->vmcb->save.dr7 = 0; 710 svm->vmcb->save.cpl = 0; 711 svm->vmcb->control.exit_int_info = 0; 712 713 vmcb_mark_all_dirty(svm->vmcb); 714 715 trace_kvm_nested_vmexit_inject(vmcb12->control.exit_code, 716 vmcb12->control.exit_info_1, 717 vmcb12->control.exit_info_2, 718 vmcb12->control.exit_int_info, 719 vmcb12->control.exit_int_info_err, 720 KVM_ISA_SVM); 721 722 kvm_vcpu_unmap(&svm->vcpu, &map, true); 723 724 nested_svm_uninit_mmu_context(&svm->vcpu); 725 726 rc = nested_svm_load_cr3(&svm->vcpu, hsave->save.cr3, false); 727 if (rc) 728 return 1; 729 730 if (npt_enabled) 731 svm->vmcb->save.cr3 = hsave->save.cr3; 732 733 /* 734 * Drop what we picked up for L2 via svm_complete_interrupts() so it 735 * doesn't end up in L1. 736 */ 737 svm->vcpu.arch.nmi_injected = false; 738 kvm_clear_exception_queue(&svm->vcpu); 739 kvm_clear_interrupt_queue(&svm->vcpu); 740 741 return 0; 742} 743 744int svm_allocate_nested(struct vcpu_svm *svm) 745{ 746 struct page *hsave_page; 747 748 if (svm->nested.initialized) 749 return 0; 750 751 hsave_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO); 752 if (!hsave_page) 753 return -ENOMEM; 754 svm->nested.hsave = page_address(hsave_page); 755 756 svm->nested.msrpm = svm_vcpu_alloc_msrpm(); 757 if (!svm->nested.msrpm) 758 goto err_free_hsave; 759 svm_vcpu_init_msrpm(&svm->vcpu, svm->nested.msrpm); 760 761 svm->nested.initialized = true; 762 return 0; 763 764err_free_hsave: 765 __free_page(hsave_page); 766 return -ENOMEM; 767} 768 769void svm_free_nested(struct vcpu_svm *svm) 770{ 771 if (!svm->nested.initialized) 772 return; 773 774 svm_vcpu_free_msrpm(svm->nested.msrpm); 775 svm->nested.msrpm = NULL; 776 777 __free_page(virt_to_page(svm->nested.hsave)); 778 svm->nested.hsave = NULL; 779 780 svm->nested.initialized = false; 781} 782 783/* 784 * Forcibly leave nested mode in order to be able to reset the VCPU later on. 785 */ 786void svm_leave_nested(struct kvm_vcpu *vcpu) 787{ 788 struct vcpu_svm *svm = to_svm(vcpu); 789 790 if (is_guest_mode(&svm->vcpu)) { 791 struct vmcb *hsave = svm->nested.hsave; 792 struct vmcb *vmcb = svm->vmcb; 793 794 svm->nested.nested_run_pending = 0; 795 leave_guest_mode(&svm->vcpu); 796 copy_vmcb_control_area(&vmcb->control, &hsave->control); 797 nested_svm_uninit_mmu_context(&svm->vcpu); 798 } 799 800 kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, &svm->vcpu); 801} 802 803static int nested_svm_exit_handled_msr(struct vcpu_svm *svm) 804{ 805 u32 offset, msr, value; 806 int write, mask; 807 808 if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT))) 809 return NESTED_EXIT_HOST; 810 811 msr = svm->vcpu.arch.regs[VCPU_REGS_RCX]; 812 offset = svm_msrpm_offset(msr); 813 write = svm->vmcb->control.exit_info_1 & 1; 814 mask = 1 << ((2 * (msr & 0xf)) + write); 815 816 if (offset == MSR_INVALID) 817 return NESTED_EXIT_DONE; 818 819 /* Offset is in 32 bit units but need in 8 bit units */ 820 offset *= 4; 821 822 if (kvm_vcpu_read_guest(&svm->vcpu, svm->nested.ctl.msrpm_base_pa + offset, &value, 4)) 823 return NESTED_EXIT_DONE; 824 825 return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST; 826} 827 828static int nested_svm_intercept_ioio(struct vcpu_svm *svm) 829{ 830 unsigned port, size, iopm_len; 831 u16 val, mask; 832 u8 start_bit; 833 u64 gpa; 834 835 if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_IOIO_PROT))) 836 return NESTED_EXIT_HOST; 837 838 port = svm->vmcb->control.exit_info_1 >> 16; 839 size = (svm->vmcb->control.exit_info_1 & SVM_IOIO_SIZE_MASK) >> 840 SVM_IOIO_SIZE_SHIFT; 841 gpa = svm->nested.ctl.iopm_base_pa + (port / 8); 842 start_bit = port % 8; 843 iopm_len = (start_bit + size > 8) ? 2 : 1; 844 mask = (0xf >> (4 - size)) << start_bit; 845 val = 0; 846 847 if (kvm_vcpu_read_guest(&svm->vcpu, gpa, &val, iopm_len)) 848 return NESTED_EXIT_DONE; 849 850 return (val & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST; 851} 852 853static int nested_svm_intercept(struct vcpu_svm *svm) 854{ 855 u32 exit_code = svm->vmcb->control.exit_code; 856 int vmexit = NESTED_EXIT_HOST; 857 858 switch (exit_code) { 859 case SVM_EXIT_MSR: 860 vmexit = nested_svm_exit_handled_msr(svm); 861 break; 862 case SVM_EXIT_IOIO: 863 vmexit = nested_svm_intercept_ioio(svm); 864 break; 865 case SVM_EXIT_READ_CR0 ... SVM_EXIT_WRITE_CR8: { 866 if (vmcb_is_intercept(&svm->nested.ctl, exit_code)) 867 vmexit = NESTED_EXIT_DONE; 868 break; 869 } 870 case SVM_EXIT_READ_DR0 ... SVM_EXIT_WRITE_DR7: { 871 if (vmcb_is_intercept(&svm->nested.ctl, exit_code)) 872 vmexit = NESTED_EXIT_DONE; 873 break; 874 } 875 case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: { 876 /* 877 * Host-intercepted exceptions have been checked already in 878 * nested_svm_exit_special. There is nothing to do here, 879 * the vmexit is injected by svm_check_nested_events. 880 */ 881 vmexit = NESTED_EXIT_DONE; 882 break; 883 } 884 case SVM_EXIT_ERR: { 885 vmexit = NESTED_EXIT_DONE; 886 break; 887 } 888 default: { 889 if (vmcb_is_intercept(&svm->nested.ctl, exit_code)) 890 vmexit = NESTED_EXIT_DONE; 891 } 892 } 893 894 return vmexit; 895} 896 897int nested_svm_exit_handled(struct vcpu_svm *svm) 898{ 899 int vmexit; 900 901 vmexit = nested_svm_intercept(svm); 902 903 if (vmexit == NESTED_EXIT_DONE) 904 nested_svm_vmexit(svm); 905 906 return vmexit; 907} 908 909int nested_svm_check_permissions(struct vcpu_svm *svm) 910{ 911 if (!(svm->vcpu.arch.efer & EFER_SVME) || 912 !is_paging(&svm->vcpu)) { 913 kvm_queue_exception(&svm->vcpu, UD_VECTOR); 914 return 1; 915 } 916 917 if (svm->vmcb->save.cpl) { 918 kvm_inject_gp(&svm->vcpu, 0); 919 return 1; 920 } 921 922 return 0; 923} 924 925static bool nested_exit_on_exception(struct vcpu_svm *svm) 926{ 927 unsigned int nr = svm->vcpu.arch.exception.nr; 928 929 return (svm->nested.ctl.intercepts[INTERCEPT_EXCEPTION] & BIT(nr)); 930} 931 932static void nested_svm_inject_exception_vmexit(struct vcpu_svm *svm) 933{ 934 unsigned int nr = svm->vcpu.arch.exception.nr; 935 936 svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr; 937 svm->vmcb->control.exit_code_hi = 0; 938 939 if (svm->vcpu.arch.exception.has_error_code) 940 svm->vmcb->control.exit_info_1 = svm->vcpu.arch.exception.error_code; 941 942 /* 943 * EXITINFO2 is undefined for all exception intercepts other 944 * than #PF. 945 */ 946 if (nr == PF_VECTOR) { 947 if (svm->vcpu.arch.exception.nested_apf) 948 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.apf.nested_apf_token; 949 else if (svm->vcpu.arch.exception.has_payload) 950 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.exception.payload; 951 else 952 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2; 953 } else if (nr == DB_VECTOR) { 954 /* See inject_pending_event. */ 955 kvm_deliver_exception_payload(&svm->vcpu); 956 if (svm->vcpu.arch.dr7 & DR7_GD) { 957 svm->vcpu.arch.dr7 &= ~DR7_GD; 958 kvm_update_dr7(&svm->vcpu); 959 } 960 } else 961 WARN_ON(svm->vcpu.arch.exception.has_payload); 962 963 nested_svm_vmexit(svm); 964} 965 966static void nested_svm_smi(struct vcpu_svm *svm) 967{ 968 svm->vmcb->control.exit_code = SVM_EXIT_SMI; 969 svm->vmcb->control.exit_info_1 = 0; 970 svm->vmcb->control.exit_info_2 = 0; 971 972 nested_svm_vmexit(svm); 973} 974 975static void nested_svm_nmi(struct vcpu_svm *svm) 976{ 977 svm->vmcb->control.exit_code = SVM_EXIT_NMI; 978 svm->vmcb->control.exit_info_1 = 0; 979 svm->vmcb->control.exit_info_2 = 0; 980 981 nested_svm_vmexit(svm); 982} 983 984static void nested_svm_intr(struct vcpu_svm *svm) 985{ 986 trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip); 987 988 svm->vmcb->control.exit_code = SVM_EXIT_INTR; 989 svm->vmcb->control.exit_info_1 = 0; 990 svm->vmcb->control.exit_info_2 = 0; 991 992 nested_svm_vmexit(svm); 993} 994 995static inline bool nested_exit_on_init(struct vcpu_svm *svm) 996{ 997 return vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_INIT); 998} 999 1000static void nested_svm_init(struct vcpu_svm *svm) 1001{ 1002 svm->vmcb->control.exit_code = SVM_EXIT_INIT; 1003 svm->vmcb->control.exit_info_1 = 0; 1004 svm->vmcb->control.exit_info_2 = 0; 1005 1006 nested_svm_vmexit(svm); 1007} 1008 1009 1010static int svm_check_nested_events(struct kvm_vcpu *vcpu) 1011{ 1012 struct vcpu_svm *svm = to_svm(vcpu); 1013 bool block_nested_events = 1014 kvm_event_needs_reinjection(vcpu) || svm->nested.nested_run_pending; 1015 struct kvm_lapic *apic = vcpu->arch.apic; 1016 1017 if (lapic_in_kernel(vcpu) && 1018 test_bit(KVM_APIC_INIT, &apic->pending_events)) { 1019 if (block_nested_events) 1020 return -EBUSY; 1021 if (!nested_exit_on_init(svm)) 1022 return 0; 1023 nested_svm_init(svm); 1024 return 0; 1025 } 1026 1027 if (vcpu->arch.exception.pending) { 1028 if (block_nested_events) 1029 return -EBUSY; 1030 if (!nested_exit_on_exception(svm)) 1031 return 0; 1032 nested_svm_inject_exception_vmexit(svm); 1033 return 0; 1034 } 1035 1036 if (vcpu->arch.smi_pending && !svm_smi_blocked(vcpu)) { 1037 if (block_nested_events) 1038 return -EBUSY; 1039 if (!nested_exit_on_smi(svm)) 1040 return 0; 1041 nested_svm_smi(svm); 1042 return 0; 1043 } 1044 1045 if (vcpu->arch.nmi_pending && !svm_nmi_blocked(vcpu)) { 1046 if (block_nested_events) 1047 return -EBUSY; 1048 if (!nested_exit_on_nmi(svm)) 1049 return 0; 1050 nested_svm_nmi(svm); 1051 return 0; 1052 } 1053 1054 if (kvm_cpu_has_interrupt(vcpu) && !svm_interrupt_blocked(vcpu)) { 1055 if (block_nested_events) 1056 return -EBUSY; 1057 if (!nested_exit_on_intr(svm)) 1058 return 0; 1059 nested_svm_intr(svm); 1060 return 0; 1061 } 1062 1063 return 0; 1064} 1065 1066int nested_svm_exit_special(struct vcpu_svm *svm) 1067{ 1068 u32 exit_code = svm->vmcb->control.exit_code; 1069 1070 switch (exit_code) { 1071 case SVM_EXIT_INTR: 1072 case SVM_EXIT_NMI: 1073 case SVM_EXIT_NPF: 1074 return NESTED_EXIT_HOST; 1075 case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: { 1076 u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE); 1077 1078 if (get_host_vmcb(svm)->control.intercepts[INTERCEPT_EXCEPTION] & 1079 excp_bits) 1080 return NESTED_EXIT_HOST; 1081 else if (exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR && 1082 svm->vcpu.arch.apf.host_apf_flags) 1083 /* Trap async PF even if not shadowing */ 1084 return NESTED_EXIT_HOST; 1085 break; 1086 } 1087 default: 1088 break; 1089 } 1090 1091 return NESTED_EXIT_CONTINUE; 1092} 1093 1094static int svm_get_nested_state(struct kvm_vcpu *vcpu, 1095 struct kvm_nested_state __user *user_kvm_nested_state, 1096 u32 user_data_size) 1097{ 1098 struct vcpu_svm *svm; 1099 struct kvm_nested_state kvm_state = { 1100 .flags = 0, 1101 .format = KVM_STATE_NESTED_FORMAT_SVM, 1102 .size = sizeof(kvm_state), 1103 }; 1104 struct vmcb __user *user_vmcb = (struct vmcb __user *) 1105 &user_kvm_nested_state->data.svm[0]; 1106 1107 if (!vcpu) 1108 return kvm_state.size + KVM_STATE_NESTED_SVM_VMCB_SIZE; 1109 1110 svm = to_svm(vcpu); 1111 1112 if (user_data_size < kvm_state.size) 1113 goto out; 1114 1115 /* First fill in the header and copy it out. */ 1116 if (is_guest_mode(vcpu)) { 1117 kvm_state.hdr.svm.vmcb_pa = svm->nested.vmcb12_gpa; 1118 kvm_state.size += KVM_STATE_NESTED_SVM_VMCB_SIZE; 1119 kvm_state.flags |= KVM_STATE_NESTED_GUEST_MODE; 1120 1121 if (svm->nested.nested_run_pending) 1122 kvm_state.flags |= KVM_STATE_NESTED_RUN_PENDING; 1123 } 1124 1125 if (gif_set(svm)) 1126 kvm_state.flags |= KVM_STATE_NESTED_GIF_SET; 1127 1128 if (copy_to_user(user_kvm_nested_state, &kvm_state, sizeof(kvm_state))) 1129 return -EFAULT; 1130 1131 if (!is_guest_mode(vcpu)) 1132 goto out; 1133 1134 /* 1135 * Copy over the full size of the VMCB rather than just the size 1136 * of the structs. 1137 */ 1138 if (clear_user(user_vmcb, KVM_STATE_NESTED_SVM_VMCB_SIZE)) 1139 return -EFAULT; 1140 if (copy_to_user(&user_vmcb->control, &svm->nested.ctl, 1141 sizeof(user_vmcb->control))) 1142 return -EFAULT; 1143 if (copy_to_user(&user_vmcb->save, &svm->nested.hsave->save, 1144 sizeof(user_vmcb->save))) 1145 return -EFAULT; 1146 1147out: 1148 return kvm_state.size; 1149} 1150 1151static int svm_set_nested_state(struct kvm_vcpu *vcpu, 1152 struct kvm_nested_state __user *user_kvm_nested_state, 1153 struct kvm_nested_state *kvm_state) 1154{ 1155 struct vcpu_svm *svm = to_svm(vcpu); 1156 struct vmcb *hsave = svm->nested.hsave; 1157 struct vmcb __user *user_vmcb = (struct vmcb __user *) 1158 &user_kvm_nested_state->data.svm[0]; 1159 struct vmcb_control_area *ctl; 1160 struct vmcb_save_area *save; 1161 int ret; 1162 u32 cr0; 1163 1164 BUILD_BUG_ON(sizeof(struct vmcb_control_area) + sizeof(struct vmcb_save_area) > 1165 KVM_STATE_NESTED_SVM_VMCB_SIZE); 1166 1167 if (kvm_state->format != KVM_STATE_NESTED_FORMAT_SVM) 1168 return -EINVAL; 1169 1170 if (kvm_state->flags & ~(KVM_STATE_NESTED_GUEST_MODE | 1171 KVM_STATE_NESTED_RUN_PENDING | 1172 KVM_STATE_NESTED_GIF_SET)) 1173 return -EINVAL; 1174 1175 /* 1176 * If in guest mode, vcpu->arch.efer actually refers to the L2 guest's 1177 * EFER.SVME, but EFER.SVME still has to be 1 for VMRUN to succeed. 1178 */ 1179 if (!(vcpu->arch.efer & EFER_SVME)) { 1180 /* GIF=1 and no guest mode are required if SVME=0. */ 1181 if (kvm_state->flags != KVM_STATE_NESTED_GIF_SET) 1182 return -EINVAL; 1183 } 1184 1185 /* SMM temporarily disables SVM, so we cannot be in guest mode. */ 1186 if (is_smm(vcpu) && (kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE)) 1187 return -EINVAL; 1188 1189 if (!(kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE)) { 1190 svm_leave_nested(vcpu); 1191 svm_set_gif(svm, !!(kvm_state->flags & KVM_STATE_NESTED_GIF_SET)); 1192 return 0; 1193 } 1194 1195 if (!page_address_valid(vcpu, kvm_state->hdr.svm.vmcb_pa)) 1196 return -EINVAL; 1197 if (kvm_state->size < sizeof(*kvm_state) + KVM_STATE_NESTED_SVM_VMCB_SIZE) 1198 return -EINVAL; 1199 1200 ret = -ENOMEM; 1201 ctl = kzalloc(sizeof(*ctl), GFP_KERNEL_ACCOUNT); 1202 save = kzalloc(sizeof(*save), GFP_KERNEL_ACCOUNT); 1203 if (!ctl || !save) 1204 goto out_free; 1205 1206 ret = -EFAULT; 1207 if (copy_from_user(ctl, &user_vmcb->control, sizeof(*ctl))) 1208 goto out_free; 1209 if (copy_from_user(save, &user_vmcb->save, sizeof(*save))) 1210 goto out_free; 1211 1212 ret = -EINVAL; 1213 if (!nested_vmcb_check_controls(ctl)) 1214 goto out_free; 1215 1216 /* 1217 * Processor state contains L2 state. Check that it is 1218 * valid for guest mode (see nested_vmcb_checks). 1219 */ 1220 cr0 = kvm_read_cr0(vcpu); 1221 if (((cr0 & X86_CR0_CD) == 0) && (cr0 & X86_CR0_NW)) 1222 goto out_free; 1223 1224 /* 1225 * Validate host state saved from before VMRUN (see 1226 * nested_svm_check_permissions). 1227 * TODO: validate reserved bits for all saved state. 1228 */ 1229 if (!(save->cr0 & X86_CR0_PG)) 1230 goto out_free; 1231 if (!(save->efer & EFER_SVME)) 1232 goto out_free; 1233 1234 /* 1235 * All checks done, we can enter guest mode. L1 control fields 1236 * come from the nested save state. Guest state is already 1237 * in the registers, the save area of the nested state instead 1238 * contains saved L1 state. 1239 */ 1240 copy_vmcb_control_area(&hsave->control, &svm->vmcb->control); 1241 hsave->save = *save; 1242 1243 if (is_guest_mode(vcpu)) 1244 svm_leave_nested(vcpu); 1245 1246 svm->nested.vmcb12_gpa = kvm_state->hdr.svm.vmcb_pa; 1247 load_nested_vmcb_control(svm, ctl); 1248 nested_prepare_vmcb_control(svm); 1249 1250 kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu); 1251 ret = 0; 1252out_free: 1253 kfree(save); 1254 kfree(ctl); 1255 1256 return ret; 1257} 1258 1259struct kvm_x86_nested_ops svm_nested_ops = { 1260 .leave_nested = svm_leave_nested, 1261 .check_events = svm_check_nested_events, 1262 .get_nested_state_pages = svm_get_nested_state_pages, 1263 .get_state = svm_get_nested_state, 1264 .set_state = svm_set_nested_state, 1265}; 1266