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 #define CC KVM_NESTED_VMENTER_CONSISTENCY_CHECK 33 34 static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu, 35 struct x86_exception *fault) 36 { 37 struct vcpu_svm *svm = to_svm(vcpu); 38 39 if (svm->vmcb->control.exit_code != SVM_EXIT_NPF) { 40 /* 41 * TODO: track the cause of the nested page fault, and 42 * correctly fill in the high bits of exit_info_1. 43 */ 44 svm->vmcb->control.exit_code = SVM_EXIT_NPF; 45 svm->vmcb->control.exit_code_hi = 0; 46 svm->vmcb->control.exit_info_1 = (1ULL << 32); 47 svm->vmcb->control.exit_info_2 = fault->address; 48 } 49 50 svm->vmcb->control.exit_info_1 &= ~0xffffffffULL; 51 svm->vmcb->control.exit_info_1 |= fault->error_code; 52 53 nested_svm_vmexit(svm); 54 } 55 56 static void svm_inject_page_fault_nested(struct kvm_vcpu *vcpu, struct x86_exception *fault) 57 { 58 struct vcpu_svm *svm = to_svm(vcpu); 59 WARN_ON(!is_guest_mode(vcpu)); 60 61 if (vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_EXCEPTION_OFFSET + PF_VECTOR) && 62 !svm->nested.nested_run_pending) { 63 svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + PF_VECTOR; 64 svm->vmcb->control.exit_code_hi = 0; 65 svm->vmcb->control.exit_info_1 = fault->error_code; 66 svm->vmcb->control.exit_info_2 = fault->address; 67 nested_svm_vmexit(svm); 68 } else { 69 kvm_inject_page_fault(vcpu, fault); 70 } 71 } 72 73 static u64 nested_svm_get_tdp_pdptr(struct kvm_vcpu *vcpu, int index) 74 { 75 struct vcpu_svm *svm = to_svm(vcpu); 76 u64 cr3 = svm->nested.ctl.nested_cr3; 77 u64 pdpte; 78 int ret; 79 80 ret = kvm_vcpu_read_guest_page(vcpu, gpa_to_gfn(cr3), &pdpte, 81 offset_in_page(cr3) + index * 8, 8); 82 if (ret) 83 return 0; 84 return pdpte; 85 } 86 87 static unsigned long nested_svm_get_tdp_cr3(struct kvm_vcpu *vcpu) 88 { 89 struct vcpu_svm *svm = to_svm(vcpu); 90 91 return svm->nested.ctl.nested_cr3; 92 } 93 94 static void nested_svm_init_mmu_context(struct kvm_vcpu *vcpu) 95 { 96 struct vcpu_svm *svm = to_svm(vcpu); 97 98 WARN_ON(mmu_is_nested(vcpu)); 99 100 vcpu->arch.mmu = &vcpu->arch.guest_mmu; 101 102 /* 103 * The NPT format depends on L1's CR4 and EFER, which is in vmcb01. Note, 104 * when called via KVM_SET_NESTED_STATE, that state may _not_ match current 105 * vCPU state. CR0.WP is explicitly ignored, while CR0.PG is required. 106 */ 107 kvm_init_shadow_npt_mmu(vcpu, X86_CR0_PG, svm->vmcb01.ptr->save.cr4, 108 svm->vmcb01.ptr->save.efer, 109 svm->nested.ctl.nested_cr3); 110 vcpu->arch.mmu->get_guest_pgd = nested_svm_get_tdp_cr3; 111 vcpu->arch.mmu->get_pdptr = nested_svm_get_tdp_pdptr; 112 vcpu->arch.mmu->inject_page_fault = nested_svm_inject_npf_exit; 113 vcpu->arch.walk_mmu = &vcpu->arch.nested_mmu; 114 } 115 116 static void nested_svm_uninit_mmu_context(struct kvm_vcpu *vcpu) 117 { 118 vcpu->arch.mmu = &vcpu->arch.root_mmu; 119 vcpu->arch.walk_mmu = &vcpu->arch.root_mmu; 120 } 121 122 void recalc_intercepts(struct vcpu_svm *svm) 123 { 124 struct vmcb_control_area *c, *h, *g; 125 unsigned int i; 126 127 vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS); 128 129 if (!is_guest_mode(&svm->vcpu)) 130 return; 131 132 c = &svm->vmcb->control; 133 h = &svm->vmcb01.ptr->control; 134 g = &svm->nested.ctl; 135 136 for (i = 0; i < MAX_INTERCEPT; i++) 137 c->intercepts[i] = h->intercepts[i]; 138 139 if (g->int_ctl & V_INTR_MASKING_MASK) { 140 /* We only want the cr8 intercept bits of L1 */ 141 vmcb_clr_intercept(c, INTERCEPT_CR8_READ); 142 vmcb_clr_intercept(c, INTERCEPT_CR8_WRITE); 143 144 /* 145 * Once running L2 with HF_VINTR_MASK, EFLAGS.IF does not 146 * affect any interrupt we may want to inject; therefore, 147 * interrupt window vmexits are irrelevant to L0. 148 */ 149 vmcb_clr_intercept(c, INTERCEPT_VINTR); 150 } 151 152 /* We don't want to see VMMCALLs from a nested guest */ 153 vmcb_clr_intercept(c, INTERCEPT_VMMCALL); 154 155 for (i = 0; i < MAX_INTERCEPT; i++) 156 c->intercepts[i] |= g->intercepts[i]; 157 158 /* If SMI is not intercepted, ignore guest SMI intercept as well */ 159 if (!intercept_smi) 160 vmcb_clr_intercept(c, INTERCEPT_SMI); 161 } 162 163 static void copy_vmcb_control_area(struct vmcb_control_area *dst, 164 struct vmcb_control_area *from) 165 { 166 unsigned int i; 167 168 for (i = 0; i < MAX_INTERCEPT; i++) 169 dst->intercepts[i] = from->intercepts[i]; 170 171 dst->iopm_base_pa = from->iopm_base_pa; 172 dst->msrpm_base_pa = from->msrpm_base_pa; 173 dst->tsc_offset = from->tsc_offset; 174 /* asid not copied, it is handled manually for svm->vmcb. */ 175 dst->tlb_ctl = from->tlb_ctl; 176 dst->int_ctl = from->int_ctl; 177 dst->int_vector = from->int_vector; 178 dst->int_state = from->int_state; 179 dst->exit_code = from->exit_code; 180 dst->exit_code_hi = from->exit_code_hi; 181 dst->exit_info_1 = from->exit_info_1; 182 dst->exit_info_2 = from->exit_info_2; 183 dst->exit_int_info = from->exit_int_info; 184 dst->exit_int_info_err = from->exit_int_info_err; 185 dst->nested_ctl = from->nested_ctl; 186 dst->event_inj = from->event_inj; 187 dst->event_inj_err = from->event_inj_err; 188 dst->nested_cr3 = from->nested_cr3; 189 dst->virt_ext = from->virt_ext; 190 dst->pause_filter_count = from->pause_filter_count; 191 dst->pause_filter_thresh = from->pause_filter_thresh; 192 } 193 194 static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm) 195 { 196 /* 197 * This function merges the msr permission bitmaps of kvm and the 198 * nested vmcb. It is optimized in that it only merges the parts where 199 * the kvm msr permission bitmap may contain zero bits 200 */ 201 int i; 202 203 if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT))) 204 return true; 205 206 for (i = 0; i < MSRPM_OFFSETS; i++) { 207 u32 value, p; 208 u64 offset; 209 210 if (msrpm_offsets[i] == 0xffffffff) 211 break; 212 213 p = msrpm_offsets[i]; 214 offset = svm->nested.ctl.msrpm_base_pa + (p * 4); 215 216 if (kvm_vcpu_read_guest(&svm->vcpu, offset, &value, 4)) 217 return false; 218 219 svm->nested.msrpm[p] = svm->msrpm[p] | value; 220 } 221 222 svm->vmcb->control.msrpm_base_pa = __sme_set(__pa(svm->nested.msrpm)); 223 224 return true; 225 } 226 227 /* 228 * Bits 11:0 of bitmap address are ignored by hardware 229 */ 230 static bool nested_svm_check_bitmap_pa(struct kvm_vcpu *vcpu, u64 pa, u32 size) 231 { 232 u64 addr = PAGE_ALIGN(pa); 233 234 return kvm_vcpu_is_legal_gpa(vcpu, addr) && 235 kvm_vcpu_is_legal_gpa(vcpu, addr + size - 1); 236 } 237 238 static bool nested_vmcb_check_controls(struct kvm_vcpu *vcpu, 239 struct vmcb_control_area *control) 240 { 241 if (CC(!vmcb_is_intercept(control, INTERCEPT_VMRUN))) 242 return false; 243 244 if (CC(control->asid == 0)) 245 return false; 246 247 if (CC((control->nested_ctl & SVM_NESTED_CTL_NP_ENABLE) && !npt_enabled)) 248 return false; 249 250 if (CC(!nested_svm_check_bitmap_pa(vcpu, control->msrpm_base_pa, 251 MSRPM_SIZE))) 252 return false; 253 if (CC(!nested_svm_check_bitmap_pa(vcpu, control->iopm_base_pa, 254 IOPM_SIZE))) 255 return false; 256 257 return true; 258 } 259 260 static bool nested_vmcb_check_cr3_cr4(struct kvm_vcpu *vcpu, 261 struct vmcb_save_area *save) 262 { 263 /* 264 * These checks are also performed by KVM_SET_SREGS, 265 * except that EFER.LMA is not checked by SVM against 266 * CR0.PG && EFER.LME. 267 */ 268 if ((save->efer & EFER_LME) && (save->cr0 & X86_CR0_PG)) { 269 if (CC(!(save->cr4 & X86_CR4_PAE)) || 270 CC(!(save->cr0 & X86_CR0_PE)) || 271 CC(kvm_vcpu_is_illegal_gpa(vcpu, save->cr3))) 272 return false; 273 } 274 275 if (CC(!kvm_is_valid_cr4(vcpu, save->cr4))) 276 return false; 277 278 return true; 279 } 280 281 /* Common checks that apply to both L1 and L2 state. */ 282 static bool nested_vmcb_valid_sregs(struct kvm_vcpu *vcpu, 283 struct vmcb_save_area *save) 284 { 285 /* 286 * FIXME: these should be done after copying the fields, 287 * to avoid TOC/TOU races. For these save area checks 288 * the possible damage is limited since kvm_set_cr0 and 289 * kvm_set_cr4 handle failure; EFER_SVME is an exception 290 * so it is force-set later in nested_prepare_vmcb_save. 291 */ 292 if (CC(!(save->efer & EFER_SVME))) 293 return false; 294 295 if (CC((save->cr0 & X86_CR0_CD) == 0 && (save->cr0 & X86_CR0_NW)) || 296 CC(save->cr0 & ~0xffffffffULL)) 297 return false; 298 299 if (CC(!kvm_dr6_valid(save->dr6)) || CC(!kvm_dr7_valid(save->dr7))) 300 return false; 301 302 if (!nested_vmcb_check_cr3_cr4(vcpu, save)) 303 return false; 304 305 if (CC(!kvm_valid_efer(vcpu, save->efer))) 306 return false; 307 308 return true; 309 } 310 311 void nested_load_control_from_vmcb12(struct vcpu_svm *svm, 312 struct vmcb_control_area *control) 313 { 314 copy_vmcb_control_area(&svm->nested.ctl, control); 315 316 /* Copy it here because nested_svm_check_controls will check it. */ 317 svm->nested.ctl.asid = control->asid; 318 svm->nested.ctl.msrpm_base_pa &= ~0x0fffULL; 319 svm->nested.ctl.iopm_base_pa &= ~0x0fffULL; 320 } 321 322 /* 323 * Synchronize fields that are written by the processor, so that 324 * they can be copied back into the vmcb12. 325 */ 326 void nested_sync_control_from_vmcb02(struct vcpu_svm *svm) 327 { 328 u32 mask; 329 svm->nested.ctl.event_inj = svm->vmcb->control.event_inj; 330 svm->nested.ctl.event_inj_err = svm->vmcb->control.event_inj_err; 331 332 /* Only a few fields of int_ctl are written by the processor. */ 333 mask = V_IRQ_MASK | V_TPR_MASK; 334 if (!(svm->nested.ctl.int_ctl & V_INTR_MASKING_MASK) && 335 svm_is_intercept(svm, INTERCEPT_VINTR)) { 336 /* 337 * In order to request an interrupt window, L0 is usurping 338 * svm->vmcb->control.int_ctl and possibly setting V_IRQ 339 * even if it was clear in L1's VMCB. Restoring it would be 340 * wrong. However, in this case V_IRQ will remain true until 341 * interrupt_window_interception calls svm_clear_vintr and 342 * restores int_ctl. We can just leave it aside. 343 */ 344 mask &= ~V_IRQ_MASK; 345 } 346 svm->nested.ctl.int_ctl &= ~mask; 347 svm->nested.ctl.int_ctl |= svm->vmcb->control.int_ctl & mask; 348 } 349 350 /* 351 * Transfer any event that L0 or L1 wanted to inject into L2 to 352 * EXIT_INT_INFO. 353 */ 354 static void nested_save_pending_event_to_vmcb12(struct vcpu_svm *svm, 355 struct vmcb *vmcb12) 356 { 357 struct kvm_vcpu *vcpu = &svm->vcpu; 358 u32 exit_int_info = 0; 359 unsigned int nr; 360 361 if (vcpu->arch.exception.injected) { 362 nr = vcpu->arch.exception.nr; 363 exit_int_info = nr | SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_EXEPT; 364 365 if (vcpu->arch.exception.has_error_code) { 366 exit_int_info |= SVM_EVTINJ_VALID_ERR; 367 vmcb12->control.exit_int_info_err = 368 vcpu->arch.exception.error_code; 369 } 370 371 } else if (vcpu->arch.nmi_injected) { 372 exit_int_info = SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_NMI; 373 374 } else if (vcpu->arch.interrupt.injected) { 375 nr = vcpu->arch.interrupt.nr; 376 exit_int_info = nr | SVM_EVTINJ_VALID; 377 378 if (vcpu->arch.interrupt.soft) 379 exit_int_info |= SVM_EVTINJ_TYPE_SOFT; 380 else 381 exit_int_info |= SVM_EVTINJ_TYPE_INTR; 382 } 383 384 vmcb12->control.exit_int_info = exit_int_info; 385 } 386 387 static inline bool nested_npt_enabled(struct vcpu_svm *svm) 388 { 389 return svm->nested.ctl.nested_ctl & SVM_NESTED_CTL_NP_ENABLE; 390 } 391 392 static void nested_svm_transition_tlb_flush(struct kvm_vcpu *vcpu) 393 { 394 /* 395 * TODO: optimize unconditional TLB flush/MMU sync. A partial list of 396 * things to fix before this can be conditional: 397 * 398 * - Flush TLBs for both L1 and L2 remote TLB flush 399 * - Honor L1's request to flush an ASID on nested VMRUN 400 * - Sync nested NPT MMU on VMRUN that flushes L2's ASID[*] 401 * - Don't crush a pending TLB flush in vmcb02 on nested VMRUN 402 * - Flush L1's ASID on KVM_REQ_TLB_FLUSH_GUEST 403 * 404 * [*] Unlike nested EPT, SVM's ASID management can invalidate nested 405 * NPT guest-physical mappings on VMRUN. 406 */ 407 kvm_make_request(KVM_REQ_MMU_SYNC, vcpu); 408 kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu); 409 } 410 411 /* 412 * Load guest's/host's cr3 on nested vmentry or vmexit. @nested_npt is true 413 * if we are emulating VM-Entry into a guest with NPT enabled. 414 */ 415 static int nested_svm_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3, 416 bool nested_npt, bool reload_pdptrs) 417 { 418 if (CC(kvm_vcpu_is_illegal_gpa(vcpu, cr3))) 419 return -EINVAL; 420 421 if (reload_pdptrs && !nested_npt && is_pae_paging(vcpu) && 422 CC(!load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3))) 423 return -EINVAL; 424 425 if (!nested_npt) 426 kvm_mmu_new_pgd(vcpu, cr3); 427 428 vcpu->arch.cr3 = cr3; 429 kvm_register_mark_available(vcpu, VCPU_EXREG_CR3); 430 431 /* Re-initialize the MMU, e.g. to pick up CR4 MMU role changes. */ 432 kvm_init_mmu(vcpu); 433 434 return 0; 435 } 436 437 void nested_vmcb02_compute_g_pat(struct vcpu_svm *svm) 438 { 439 if (!svm->nested.vmcb02.ptr) 440 return; 441 442 /* FIXME: merge g_pat from vmcb01 and vmcb12. */ 443 svm->nested.vmcb02.ptr->save.g_pat = svm->vmcb01.ptr->save.g_pat; 444 } 445 446 static void nested_vmcb02_prepare_save(struct vcpu_svm *svm, struct vmcb *vmcb12) 447 { 448 bool new_vmcb12 = false; 449 450 nested_vmcb02_compute_g_pat(svm); 451 452 /* Load the nested guest state */ 453 if (svm->nested.vmcb12_gpa != svm->nested.last_vmcb12_gpa) { 454 new_vmcb12 = true; 455 svm->nested.last_vmcb12_gpa = svm->nested.vmcb12_gpa; 456 } 457 458 if (unlikely(new_vmcb12 || vmcb_is_dirty(vmcb12, VMCB_SEG))) { 459 svm->vmcb->save.es = vmcb12->save.es; 460 svm->vmcb->save.cs = vmcb12->save.cs; 461 svm->vmcb->save.ss = vmcb12->save.ss; 462 svm->vmcb->save.ds = vmcb12->save.ds; 463 svm->vmcb->save.cpl = vmcb12->save.cpl; 464 vmcb_mark_dirty(svm->vmcb, VMCB_SEG); 465 } 466 467 if (unlikely(new_vmcb12 || vmcb_is_dirty(vmcb12, VMCB_DT))) { 468 svm->vmcb->save.gdtr = vmcb12->save.gdtr; 469 svm->vmcb->save.idtr = vmcb12->save.idtr; 470 vmcb_mark_dirty(svm->vmcb, VMCB_DT); 471 } 472 473 kvm_set_rflags(&svm->vcpu, vmcb12->save.rflags | X86_EFLAGS_FIXED); 474 475 /* 476 * Force-set EFER_SVME even though it is checked earlier on the 477 * VMCB12, because the guest can flip the bit between the check 478 * and now. Clearing EFER_SVME would call svm_free_nested. 479 */ 480 svm_set_efer(&svm->vcpu, vmcb12->save.efer | EFER_SVME); 481 482 svm_set_cr0(&svm->vcpu, vmcb12->save.cr0); 483 svm_set_cr4(&svm->vcpu, vmcb12->save.cr4); 484 485 svm->vcpu.arch.cr2 = vmcb12->save.cr2; 486 487 kvm_rax_write(&svm->vcpu, vmcb12->save.rax); 488 kvm_rsp_write(&svm->vcpu, vmcb12->save.rsp); 489 kvm_rip_write(&svm->vcpu, vmcb12->save.rip); 490 491 /* In case we don't even reach vcpu_run, the fields are not updated */ 492 svm->vmcb->save.rax = vmcb12->save.rax; 493 svm->vmcb->save.rsp = vmcb12->save.rsp; 494 svm->vmcb->save.rip = vmcb12->save.rip; 495 496 /* These bits will be set properly on the first execution when new_vmc12 is true */ 497 if (unlikely(new_vmcb12 || vmcb_is_dirty(vmcb12, VMCB_DR))) { 498 svm->vmcb->save.dr7 = vmcb12->save.dr7 | DR7_FIXED_1; 499 svm->vcpu.arch.dr6 = vmcb12->save.dr6 | DR6_ACTIVE_LOW; 500 vmcb_mark_dirty(svm->vmcb, VMCB_DR); 501 } 502 } 503 504 static void nested_vmcb02_prepare_control(struct vcpu_svm *svm) 505 { 506 const u32 mask = V_INTR_MASKING_MASK | V_GIF_ENABLE_MASK | V_GIF_MASK; 507 struct kvm_vcpu *vcpu = &svm->vcpu; 508 509 /* 510 * Filled at exit: exit_code, exit_code_hi, exit_info_1, exit_info_2, 511 * exit_int_info, exit_int_info_err, next_rip, insn_len, insn_bytes. 512 */ 513 514 /* 515 * Also covers avic_vapic_bar, avic_backing_page, avic_logical_id, 516 * avic_physical_id. 517 */ 518 WARN_ON(svm->vmcb01.ptr->control.int_ctl & AVIC_ENABLE_MASK); 519 520 /* Copied from vmcb01. msrpm_base can be overwritten later. */ 521 svm->vmcb->control.nested_ctl = svm->vmcb01.ptr->control.nested_ctl; 522 svm->vmcb->control.iopm_base_pa = svm->vmcb01.ptr->control.iopm_base_pa; 523 svm->vmcb->control.msrpm_base_pa = svm->vmcb01.ptr->control.msrpm_base_pa; 524 525 /* Done at vmrun: asid. */ 526 527 /* Also overwritten later if necessary. */ 528 svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING; 529 530 /* nested_cr3. */ 531 if (nested_npt_enabled(svm)) 532 nested_svm_init_mmu_context(vcpu); 533 534 svm->vmcb->control.tsc_offset = vcpu->arch.tsc_offset = 535 vcpu->arch.l1_tsc_offset + svm->nested.ctl.tsc_offset; 536 537 svm->vmcb->control.int_ctl = 538 (svm->nested.ctl.int_ctl & ~mask) | 539 (svm->vmcb01.ptr->control.int_ctl & mask); 540 541 svm->vmcb->control.virt_ext = svm->nested.ctl.virt_ext; 542 svm->vmcb->control.int_vector = svm->nested.ctl.int_vector; 543 svm->vmcb->control.int_state = svm->nested.ctl.int_state; 544 svm->vmcb->control.event_inj = svm->nested.ctl.event_inj; 545 svm->vmcb->control.event_inj_err = svm->nested.ctl.event_inj_err; 546 547 svm->vmcb->control.pause_filter_count = svm->nested.ctl.pause_filter_count; 548 svm->vmcb->control.pause_filter_thresh = svm->nested.ctl.pause_filter_thresh; 549 550 nested_svm_transition_tlb_flush(vcpu); 551 552 /* Enter Guest-Mode */ 553 enter_guest_mode(vcpu); 554 555 /* 556 * Merge guest and host intercepts - must be called with vcpu in 557 * guest-mode to take effect. 558 */ 559 recalc_intercepts(svm); 560 } 561 562 static void nested_svm_copy_common_state(struct vmcb *from_vmcb, struct vmcb *to_vmcb) 563 { 564 /* 565 * Some VMCB state is shared between L1 and L2 and thus has to be 566 * moved at the time of nested vmrun and vmexit. 567 * 568 * VMLOAD/VMSAVE state would also belong in this category, but KVM 569 * always performs VMLOAD and VMSAVE from the VMCB01. 570 */ 571 to_vmcb->save.spec_ctrl = from_vmcb->save.spec_ctrl; 572 } 573 574 int enter_svm_guest_mode(struct kvm_vcpu *vcpu, u64 vmcb12_gpa, 575 struct vmcb *vmcb12) 576 { 577 struct vcpu_svm *svm = to_svm(vcpu); 578 int ret; 579 580 trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb12_gpa, 581 vmcb12->save.rip, 582 vmcb12->control.int_ctl, 583 vmcb12->control.event_inj, 584 vmcb12->control.nested_ctl); 585 586 trace_kvm_nested_intercepts(vmcb12->control.intercepts[INTERCEPT_CR] & 0xffff, 587 vmcb12->control.intercepts[INTERCEPT_CR] >> 16, 588 vmcb12->control.intercepts[INTERCEPT_EXCEPTION], 589 vmcb12->control.intercepts[INTERCEPT_WORD3], 590 vmcb12->control.intercepts[INTERCEPT_WORD4], 591 vmcb12->control.intercepts[INTERCEPT_WORD5]); 592 593 594 svm->nested.vmcb12_gpa = vmcb12_gpa; 595 596 WARN_ON(svm->vmcb == svm->nested.vmcb02.ptr); 597 598 nested_svm_copy_common_state(svm->vmcb01.ptr, svm->nested.vmcb02.ptr); 599 600 svm_switch_vmcb(svm, &svm->nested.vmcb02); 601 nested_vmcb02_prepare_control(svm); 602 nested_vmcb02_prepare_save(svm, vmcb12); 603 604 ret = nested_svm_load_cr3(&svm->vcpu, vmcb12->save.cr3, 605 nested_npt_enabled(svm), true); 606 if (ret) 607 return ret; 608 609 if (!npt_enabled) 610 vcpu->arch.mmu->inject_page_fault = svm_inject_page_fault_nested; 611 612 svm_set_gif(svm, true); 613 614 return 0; 615 } 616 617 int nested_svm_vmrun(struct kvm_vcpu *vcpu) 618 { 619 struct vcpu_svm *svm = to_svm(vcpu); 620 int ret; 621 struct vmcb *vmcb12; 622 struct kvm_host_map map; 623 u64 vmcb12_gpa; 624 625 if (!svm->nested.hsave_msr) { 626 kvm_inject_gp(vcpu, 0); 627 return 1; 628 } 629 630 if (is_smm(vcpu)) { 631 kvm_queue_exception(vcpu, UD_VECTOR); 632 return 1; 633 } 634 635 vmcb12_gpa = svm->vmcb->save.rax; 636 ret = kvm_vcpu_map(vcpu, gpa_to_gfn(vmcb12_gpa), &map); 637 if (ret == -EINVAL) { 638 kvm_inject_gp(vcpu, 0); 639 return 1; 640 } else if (ret) { 641 return kvm_skip_emulated_instruction(vcpu); 642 } 643 644 ret = kvm_skip_emulated_instruction(vcpu); 645 646 vmcb12 = map.hva; 647 648 if (WARN_ON_ONCE(!svm->nested.initialized)) 649 return -EINVAL; 650 651 nested_load_control_from_vmcb12(svm, &vmcb12->control); 652 653 if (!nested_vmcb_valid_sregs(vcpu, &vmcb12->save) || 654 !nested_vmcb_check_controls(vcpu, &svm->nested.ctl)) { 655 vmcb12->control.exit_code = SVM_EXIT_ERR; 656 vmcb12->control.exit_code_hi = 0; 657 vmcb12->control.exit_info_1 = 0; 658 vmcb12->control.exit_info_2 = 0; 659 goto out; 660 } 661 662 663 /* Clear internal status */ 664 kvm_clear_exception_queue(vcpu); 665 kvm_clear_interrupt_queue(vcpu); 666 667 /* 668 * Since vmcb01 is not in use, we can use it to store some of the L1 669 * state. 670 */ 671 svm->vmcb01.ptr->save.efer = vcpu->arch.efer; 672 svm->vmcb01.ptr->save.cr0 = kvm_read_cr0(vcpu); 673 svm->vmcb01.ptr->save.cr4 = vcpu->arch.cr4; 674 svm->vmcb01.ptr->save.rflags = kvm_get_rflags(vcpu); 675 svm->vmcb01.ptr->save.rip = kvm_rip_read(vcpu); 676 677 if (!npt_enabled) 678 svm->vmcb01.ptr->save.cr3 = kvm_read_cr3(vcpu); 679 680 svm->nested.nested_run_pending = 1; 681 682 if (enter_svm_guest_mode(vcpu, vmcb12_gpa, vmcb12)) 683 goto out_exit_err; 684 685 if (nested_svm_vmrun_msrpm(svm)) 686 goto out; 687 688 out_exit_err: 689 svm->nested.nested_run_pending = 0; 690 691 svm->vmcb->control.exit_code = SVM_EXIT_ERR; 692 svm->vmcb->control.exit_code_hi = 0; 693 svm->vmcb->control.exit_info_1 = 0; 694 svm->vmcb->control.exit_info_2 = 0; 695 696 nested_svm_vmexit(svm); 697 698 out: 699 kvm_vcpu_unmap(vcpu, &map, true); 700 701 return ret; 702 } 703 704 /* Copy state save area fields which are handled by VMRUN */ 705 void svm_copy_vmrun_state(struct vmcb_save_area *from_save, 706 struct vmcb_save_area *to_save) 707 { 708 to_save->es = from_save->es; 709 to_save->cs = from_save->cs; 710 to_save->ss = from_save->ss; 711 to_save->ds = from_save->ds; 712 to_save->gdtr = from_save->gdtr; 713 to_save->idtr = from_save->idtr; 714 to_save->rflags = from_save->rflags | X86_EFLAGS_FIXED; 715 to_save->efer = from_save->efer; 716 to_save->cr0 = from_save->cr0; 717 to_save->cr3 = from_save->cr3; 718 to_save->cr4 = from_save->cr4; 719 to_save->rax = from_save->rax; 720 to_save->rsp = from_save->rsp; 721 to_save->rip = from_save->rip; 722 to_save->cpl = 0; 723 } 724 725 void nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb) 726 { 727 to_vmcb->save.fs = from_vmcb->save.fs; 728 to_vmcb->save.gs = from_vmcb->save.gs; 729 to_vmcb->save.tr = from_vmcb->save.tr; 730 to_vmcb->save.ldtr = from_vmcb->save.ldtr; 731 to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base; 732 to_vmcb->save.star = from_vmcb->save.star; 733 to_vmcb->save.lstar = from_vmcb->save.lstar; 734 to_vmcb->save.cstar = from_vmcb->save.cstar; 735 to_vmcb->save.sfmask = from_vmcb->save.sfmask; 736 to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs; 737 to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp; 738 to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip; 739 } 740 741 int nested_svm_vmexit(struct vcpu_svm *svm) 742 { 743 struct kvm_vcpu *vcpu = &svm->vcpu; 744 struct vmcb *vmcb12; 745 struct vmcb *vmcb = svm->vmcb; 746 struct kvm_host_map map; 747 int rc; 748 749 /* Triple faults in L2 should never escape. */ 750 WARN_ON_ONCE(kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)); 751 752 rc = kvm_vcpu_map(vcpu, gpa_to_gfn(svm->nested.vmcb12_gpa), &map); 753 if (rc) { 754 if (rc == -EINVAL) 755 kvm_inject_gp(vcpu, 0); 756 return 1; 757 } 758 759 vmcb12 = map.hva; 760 761 /* Exit Guest-Mode */ 762 leave_guest_mode(vcpu); 763 svm->nested.vmcb12_gpa = 0; 764 WARN_ON_ONCE(svm->nested.nested_run_pending); 765 766 kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu); 767 768 /* in case we halted in L2 */ 769 svm->vcpu.arch.mp_state = KVM_MP_STATE_RUNNABLE; 770 771 /* Give the current vmcb to the guest */ 772 773 vmcb12->save.es = vmcb->save.es; 774 vmcb12->save.cs = vmcb->save.cs; 775 vmcb12->save.ss = vmcb->save.ss; 776 vmcb12->save.ds = vmcb->save.ds; 777 vmcb12->save.gdtr = vmcb->save.gdtr; 778 vmcb12->save.idtr = vmcb->save.idtr; 779 vmcb12->save.efer = svm->vcpu.arch.efer; 780 vmcb12->save.cr0 = kvm_read_cr0(vcpu); 781 vmcb12->save.cr3 = kvm_read_cr3(vcpu); 782 vmcb12->save.cr2 = vmcb->save.cr2; 783 vmcb12->save.cr4 = svm->vcpu.arch.cr4; 784 vmcb12->save.rflags = kvm_get_rflags(vcpu); 785 vmcb12->save.rip = kvm_rip_read(vcpu); 786 vmcb12->save.rsp = kvm_rsp_read(vcpu); 787 vmcb12->save.rax = kvm_rax_read(vcpu); 788 vmcb12->save.dr7 = vmcb->save.dr7; 789 vmcb12->save.dr6 = svm->vcpu.arch.dr6; 790 vmcb12->save.cpl = vmcb->save.cpl; 791 792 vmcb12->control.int_state = vmcb->control.int_state; 793 vmcb12->control.exit_code = vmcb->control.exit_code; 794 vmcb12->control.exit_code_hi = vmcb->control.exit_code_hi; 795 vmcb12->control.exit_info_1 = vmcb->control.exit_info_1; 796 vmcb12->control.exit_info_2 = vmcb->control.exit_info_2; 797 798 if (vmcb12->control.exit_code != SVM_EXIT_ERR) 799 nested_save_pending_event_to_vmcb12(svm, vmcb12); 800 801 if (svm->nrips_enabled) 802 vmcb12->control.next_rip = vmcb->control.next_rip; 803 804 vmcb12->control.int_ctl = svm->nested.ctl.int_ctl; 805 vmcb12->control.tlb_ctl = svm->nested.ctl.tlb_ctl; 806 vmcb12->control.event_inj = svm->nested.ctl.event_inj; 807 vmcb12->control.event_inj_err = svm->nested.ctl.event_inj_err; 808 809 vmcb12->control.pause_filter_count = 810 svm->vmcb->control.pause_filter_count; 811 vmcb12->control.pause_filter_thresh = 812 svm->vmcb->control.pause_filter_thresh; 813 814 nested_svm_copy_common_state(svm->nested.vmcb02.ptr, svm->vmcb01.ptr); 815 816 svm_switch_vmcb(svm, &svm->vmcb01); 817 818 /* 819 * On vmexit the GIF is set to false and 820 * no event can be injected in L1. 821 */ 822 svm_set_gif(svm, false); 823 svm->vmcb->control.exit_int_info = 0; 824 825 svm->vcpu.arch.tsc_offset = svm->vcpu.arch.l1_tsc_offset; 826 if (svm->vmcb->control.tsc_offset != svm->vcpu.arch.tsc_offset) { 827 svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset; 828 vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS); 829 } 830 831 svm->nested.ctl.nested_cr3 = 0; 832 833 /* 834 * Restore processor state that had been saved in vmcb01 835 */ 836 kvm_set_rflags(vcpu, svm->vmcb->save.rflags); 837 svm_set_efer(vcpu, svm->vmcb->save.efer); 838 svm_set_cr0(vcpu, svm->vmcb->save.cr0 | X86_CR0_PE); 839 svm_set_cr4(vcpu, svm->vmcb->save.cr4); 840 kvm_rax_write(vcpu, svm->vmcb->save.rax); 841 kvm_rsp_write(vcpu, svm->vmcb->save.rsp); 842 kvm_rip_write(vcpu, svm->vmcb->save.rip); 843 844 svm->vcpu.arch.dr7 = DR7_FIXED_1; 845 kvm_update_dr7(&svm->vcpu); 846 847 trace_kvm_nested_vmexit_inject(vmcb12->control.exit_code, 848 vmcb12->control.exit_info_1, 849 vmcb12->control.exit_info_2, 850 vmcb12->control.exit_int_info, 851 vmcb12->control.exit_int_info_err, 852 KVM_ISA_SVM); 853 854 kvm_vcpu_unmap(vcpu, &map, true); 855 856 nested_svm_transition_tlb_flush(vcpu); 857 858 nested_svm_uninit_mmu_context(vcpu); 859 860 rc = nested_svm_load_cr3(vcpu, svm->vmcb->save.cr3, false, true); 861 if (rc) 862 return 1; 863 864 /* 865 * Drop what we picked up for L2 via svm_complete_interrupts() so it 866 * doesn't end up in L1. 867 */ 868 svm->vcpu.arch.nmi_injected = false; 869 kvm_clear_exception_queue(vcpu); 870 kvm_clear_interrupt_queue(vcpu); 871 872 /* 873 * If we are here following the completion of a VMRUN that 874 * is being single-stepped, queue the pending #DB intercept 875 * right now so that it an be accounted for before we execute 876 * L1's next instruction. 877 */ 878 if (unlikely(svm->vmcb->save.rflags & X86_EFLAGS_TF)) 879 kvm_queue_exception(&(svm->vcpu), DB_VECTOR); 880 881 return 0; 882 } 883 884 static void nested_svm_triple_fault(struct kvm_vcpu *vcpu) 885 { 886 nested_svm_simple_vmexit(to_svm(vcpu), SVM_EXIT_SHUTDOWN); 887 } 888 889 int svm_allocate_nested(struct vcpu_svm *svm) 890 { 891 struct page *vmcb02_page; 892 893 if (svm->nested.initialized) 894 return 0; 895 896 vmcb02_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO); 897 if (!vmcb02_page) 898 return -ENOMEM; 899 svm->nested.vmcb02.ptr = page_address(vmcb02_page); 900 svm->nested.vmcb02.pa = __sme_set(page_to_pfn(vmcb02_page) << PAGE_SHIFT); 901 902 svm->nested.msrpm = svm_vcpu_alloc_msrpm(); 903 if (!svm->nested.msrpm) 904 goto err_free_vmcb02; 905 svm_vcpu_init_msrpm(&svm->vcpu, svm->nested.msrpm); 906 907 svm->nested.initialized = true; 908 return 0; 909 910 err_free_vmcb02: 911 __free_page(vmcb02_page); 912 return -ENOMEM; 913 } 914 915 void svm_free_nested(struct vcpu_svm *svm) 916 { 917 if (!svm->nested.initialized) 918 return; 919 920 svm_vcpu_free_msrpm(svm->nested.msrpm); 921 svm->nested.msrpm = NULL; 922 923 __free_page(virt_to_page(svm->nested.vmcb02.ptr)); 924 svm->nested.vmcb02.ptr = NULL; 925 926 /* 927 * When last_vmcb12_gpa matches the current vmcb12 gpa, 928 * some vmcb12 fields are not loaded if they are marked clean 929 * in the vmcb12, since in this case they are up to date already. 930 * 931 * When the vmcb02 is freed, this optimization becomes invalid. 932 */ 933 svm->nested.last_vmcb12_gpa = INVALID_GPA; 934 935 svm->nested.initialized = false; 936 } 937 938 /* 939 * Forcibly leave nested mode in order to be able to reset the VCPU later on. 940 */ 941 void svm_leave_nested(struct vcpu_svm *svm) 942 { 943 struct kvm_vcpu *vcpu = &svm->vcpu; 944 945 if (is_guest_mode(vcpu)) { 946 svm->nested.nested_run_pending = 0; 947 svm->nested.vmcb12_gpa = INVALID_GPA; 948 949 leave_guest_mode(vcpu); 950 951 svm_switch_vmcb(svm, &svm->vmcb01); 952 953 nested_svm_uninit_mmu_context(vcpu); 954 vmcb_mark_all_dirty(svm->vmcb); 955 } 956 957 kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu); 958 } 959 960 static int nested_svm_exit_handled_msr(struct vcpu_svm *svm) 961 { 962 u32 offset, msr, value; 963 int write, mask; 964 965 if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT))) 966 return NESTED_EXIT_HOST; 967 968 msr = svm->vcpu.arch.regs[VCPU_REGS_RCX]; 969 offset = svm_msrpm_offset(msr); 970 write = svm->vmcb->control.exit_info_1 & 1; 971 mask = 1 << ((2 * (msr & 0xf)) + write); 972 973 if (offset == MSR_INVALID) 974 return NESTED_EXIT_DONE; 975 976 /* Offset is in 32 bit units but need in 8 bit units */ 977 offset *= 4; 978 979 if (kvm_vcpu_read_guest(&svm->vcpu, svm->nested.ctl.msrpm_base_pa + offset, &value, 4)) 980 return NESTED_EXIT_DONE; 981 982 return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST; 983 } 984 985 static int nested_svm_intercept_ioio(struct vcpu_svm *svm) 986 { 987 unsigned port, size, iopm_len; 988 u16 val, mask; 989 u8 start_bit; 990 u64 gpa; 991 992 if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_IOIO_PROT))) 993 return NESTED_EXIT_HOST; 994 995 port = svm->vmcb->control.exit_info_1 >> 16; 996 size = (svm->vmcb->control.exit_info_1 & SVM_IOIO_SIZE_MASK) >> 997 SVM_IOIO_SIZE_SHIFT; 998 gpa = svm->nested.ctl.iopm_base_pa + (port / 8); 999 start_bit = port % 8; 1000 iopm_len = (start_bit + size > 8) ? 2 : 1; 1001 mask = (0xf >> (4 - size)) << start_bit; 1002 val = 0; 1003 1004 if (kvm_vcpu_read_guest(&svm->vcpu, gpa, &val, iopm_len)) 1005 return NESTED_EXIT_DONE; 1006 1007 return (val & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST; 1008 } 1009 1010 static int nested_svm_intercept(struct vcpu_svm *svm) 1011 { 1012 u32 exit_code = svm->vmcb->control.exit_code; 1013 int vmexit = NESTED_EXIT_HOST; 1014 1015 switch (exit_code) { 1016 case SVM_EXIT_MSR: 1017 vmexit = nested_svm_exit_handled_msr(svm); 1018 break; 1019 case SVM_EXIT_IOIO: 1020 vmexit = nested_svm_intercept_ioio(svm); 1021 break; 1022 case SVM_EXIT_READ_CR0 ... SVM_EXIT_WRITE_CR8: { 1023 if (vmcb_is_intercept(&svm->nested.ctl, exit_code)) 1024 vmexit = NESTED_EXIT_DONE; 1025 break; 1026 } 1027 case SVM_EXIT_READ_DR0 ... SVM_EXIT_WRITE_DR7: { 1028 if (vmcb_is_intercept(&svm->nested.ctl, exit_code)) 1029 vmexit = NESTED_EXIT_DONE; 1030 break; 1031 } 1032 case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: { 1033 /* 1034 * Host-intercepted exceptions have been checked already in 1035 * nested_svm_exit_special. There is nothing to do here, 1036 * the vmexit is injected by svm_check_nested_events. 1037 */ 1038 vmexit = NESTED_EXIT_DONE; 1039 break; 1040 } 1041 case SVM_EXIT_ERR: { 1042 vmexit = NESTED_EXIT_DONE; 1043 break; 1044 } 1045 default: { 1046 if (vmcb_is_intercept(&svm->nested.ctl, exit_code)) 1047 vmexit = NESTED_EXIT_DONE; 1048 } 1049 } 1050 1051 return vmexit; 1052 } 1053 1054 int nested_svm_exit_handled(struct vcpu_svm *svm) 1055 { 1056 int vmexit; 1057 1058 vmexit = nested_svm_intercept(svm); 1059 1060 if (vmexit == NESTED_EXIT_DONE) 1061 nested_svm_vmexit(svm); 1062 1063 return vmexit; 1064 } 1065 1066 int nested_svm_check_permissions(struct kvm_vcpu *vcpu) 1067 { 1068 if (!(vcpu->arch.efer & EFER_SVME) || !is_paging(vcpu)) { 1069 kvm_queue_exception(vcpu, UD_VECTOR); 1070 return 1; 1071 } 1072 1073 if (to_svm(vcpu)->vmcb->save.cpl) { 1074 kvm_inject_gp(vcpu, 0); 1075 return 1; 1076 } 1077 1078 return 0; 1079 } 1080 1081 static bool nested_exit_on_exception(struct vcpu_svm *svm) 1082 { 1083 unsigned int nr = svm->vcpu.arch.exception.nr; 1084 1085 return (svm->nested.ctl.intercepts[INTERCEPT_EXCEPTION] & BIT(nr)); 1086 } 1087 1088 static void nested_svm_inject_exception_vmexit(struct vcpu_svm *svm) 1089 { 1090 unsigned int nr = svm->vcpu.arch.exception.nr; 1091 1092 svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr; 1093 svm->vmcb->control.exit_code_hi = 0; 1094 1095 if (svm->vcpu.arch.exception.has_error_code) 1096 svm->vmcb->control.exit_info_1 = svm->vcpu.arch.exception.error_code; 1097 1098 /* 1099 * EXITINFO2 is undefined for all exception intercepts other 1100 * than #PF. 1101 */ 1102 if (nr == PF_VECTOR) { 1103 if (svm->vcpu.arch.exception.nested_apf) 1104 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.apf.nested_apf_token; 1105 else if (svm->vcpu.arch.exception.has_payload) 1106 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.exception.payload; 1107 else 1108 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2; 1109 } else if (nr == DB_VECTOR) { 1110 /* See inject_pending_event. */ 1111 kvm_deliver_exception_payload(&svm->vcpu); 1112 if (svm->vcpu.arch.dr7 & DR7_GD) { 1113 svm->vcpu.arch.dr7 &= ~DR7_GD; 1114 kvm_update_dr7(&svm->vcpu); 1115 } 1116 } else 1117 WARN_ON(svm->vcpu.arch.exception.has_payload); 1118 1119 nested_svm_vmexit(svm); 1120 } 1121 1122 static inline bool nested_exit_on_init(struct vcpu_svm *svm) 1123 { 1124 return vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_INIT); 1125 } 1126 1127 static int svm_check_nested_events(struct kvm_vcpu *vcpu) 1128 { 1129 struct vcpu_svm *svm = to_svm(vcpu); 1130 bool block_nested_events = 1131 kvm_event_needs_reinjection(vcpu) || svm->nested.nested_run_pending; 1132 struct kvm_lapic *apic = vcpu->arch.apic; 1133 1134 if (lapic_in_kernel(vcpu) && 1135 test_bit(KVM_APIC_INIT, &apic->pending_events)) { 1136 if (block_nested_events) 1137 return -EBUSY; 1138 if (!nested_exit_on_init(svm)) 1139 return 0; 1140 nested_svm_simple_vmexit(svm, SVM_EXIT_INIT); 1141 return 0; 1142 } 1143 1144 if (vcpu->arch.exception.pending) { 1145 /* 1146 * Only a pending nested run can block a pending exception. 1147 * Otherwise an injected NMI/interrupt should either be 1148 * lost or delivered to the nested hypervisor in the EXITINTINFO 1149 * vmcb field, while delivering the pending exception. 1150 */ 1151 if (svm->nested.nested_run_pending) 1152 return -EBUSY; 1153 if (!nested_exit_on_exception(svm)) 1154 return 0; 1155 nested_svm_inject_exception_vmexit(svm); 1156 return 0; 1157 } 1158 1159 if (vcpu->arch.smi_pending && !svm_smi_blocked(vcpu)) { 1160 if (block_nested_events) 1161 return -EBUSY; 1162 if (!nested_exit_on_smi(svm)) 1163 return 0; 1164 nested_svm_simple_vmexit(svm, SVM_EXIT_SMI); 1165 return 0; 1166 } 1167 1168 if (vcpu->arch.nmi_pending && !svm_nmi_blocked(vcpu)) { 1169 if (block_nested_events) 1170 return -EBUSY; 1171 if (!nested_exit_on_nmi(svm)) 1172 return 0; 1173 nested_svm_simple_vmexit(svm, SVM_EXIT_NMI); 1174 return 0; 1175 } 1176 1177 if (kvm_cpu_has_interrupt(vcpu) && !svm_interrupt_blocked(vcpu)) { 1178 if (block_nested_events) 1179 return -EBUSY; 1180 if (!nested_exit_on_intr(svm)) 1181 return 0; 1182 trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip); 1183 nested_svm_simple_vmexit(svm, SVM_EXIT_INTR); 1184 return 0; 1185 } 1186 1187 return 0; 1188 } 1189 1190 int nested_svm_exit_special(struct vcpu_svm *svm) 1191 { 1192 u32 exit_code = svm->vmcb->control.exit_code; 1193 1194 switch (exit_code) { 1195 case SVM_EXIT_INTR: 1196 case SVM_EXIT_NMI: 1197 case SVM_EXIT_NPF: 1198 return NESTED_EXIT_HOST; 1199 case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: { 1200 u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE); 1201 1202 if (svm->vmcb01.ptr->control.intercepts[INTERCEPT_EXCEPTION] & 1203 excp_bits) 1204 return NESTED_EXIT_HOST; 1205 else if (exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR && 1206 svm->vcpu.arch.apf.host_apf_flags) 1207 /* Trap async PF even if not shadowing */ 1208 return NESTED_EXIT_HOST; 1209 break; 1210 } 1211 default: 1212 break; 1213 } 1214 1215 return NESTED_EXIT_CONTINUE; 1216 } 1217 1218 static int svm_get_nested_state(struct kvm_vcpu *vcpu, 1219 struct kvm_nested_state __user *user_kvm_nested_state, 1220 u32 user_data_size) 1221 { 1222 struct vcpu_svm *svm; 1223 struct kvm_nested_state kvm_state = { 1224 .flags = 0, 1225 .format = KVM_STATE_NESTED_FORMAT_SVM, 1226 .size = sizeof(kvm_state), 1227 }; 1228 struct vmcb __user *user_vmcb = (struct vmcb __user *) 1229 &user_kvm_nested_state->data.svm[0]; 1230 1231 if (!vcpu) 1232 return kvm_state.size + KVM_STATE_NESTED_SVM_VMCB_SIZE; 1233 1234 svm = to_svm(vcpu); 1235 1236 if (user_data_size < kvm_state.size) 1237 goto out; 1238 1239 /* First fill in the header and copy it out. */ 1240 if (is_guest_mode(vcpu)) { 1241 kvm_state.hdr.svm.vmcb_pa = svm->nested.vmcb12_gpa; 1242 kvm_state.size += KVM_STATE_NESTED_SVM_VMCB_SIZE; 1243 kvm_state.flags |= KVM_STATE_NESTED_GUEST_MODE; 1244 1245 if (svm->nested.nested_run_pending) 1246 kvm_state.flags |= KVM_STATE_NESTED_RUN_PENDING; 1247 } 1248 1249 if (gif_set(svm)) 1250 kvm_state.flags |= KVM_STATE_NESTED_GIF_SET; 1251 1252 if (copy_to_user(user_kvm_nested_state, &kvm_state, sizeof(kvm_state))) 1253 return -EFAULT; 1254 1255 if (!is_guest_mode(vcpu)) 1256 goto out; 1257 1258 /* 1259 * Copy over the full size of the VMCB rather than just the size 1260 * of the structs. 1261 */ 1262 if (clear_user(user_vmcb, KVM_STATE_NESTED_SVM_VMCB_SIZE)) 1263 return -EFAULT; 1264 if (copy_to_user(&user_vmcb->control, &svm->nested.ctl, 1265 sizeof(user_vmcb->control))) 1266 return -EFAULT; 1267 if (copy_to_user(&user_vmcb->save, &svm->vmcb01.ptr->save, 1268 sizeof(user_vmcb->save))) 1269 return -EFAULT; 1270 out: 1271 return kvm_state.size; 1272 } 1273 1274 static int svm_set_nested_state(struct kvm_vcpu *vcpu, 1275 struct kvm_nested_state __user *user_kvm_nested_state, 1276 struct kvm_nested_state *kvm_state) 1277 { 1278 struct vcpu_svm *svm = to_svm(vcpu); 1279 struct vmcb __user *user_vmcb = (struct vmcb __user *) 1280 &user_kvm_nested_state->data.svm[0]; 1281 struct vmcb_control_area *ctl; 1282 struct vmcb_save_area *save; 1283 unsigned long cr0; 1284 int ret; 1285 1286 BUILD_BUG_ON(sizeof(struct vmcb_control_area) + sizeof(struct vmcb_save_area) > 1287 KVM_STATE_NESTED_SVM_VMCB_SIZE); 1288 1289 if (kvm_state->format != KVM_STATE_NESTED_FORMAT_SVM) 1290 return -EINVAL; 1291 1292 if (kvm_state->flags & ~(KVM_STATE_NESTED_GUEST_MODE | 1293 KVM_STATE_NESTED_RUN_PENDING | 1294 KVM_STATE_NESTED_GIF_SET)) 1295 return -EINVAL; 1296 1297 /* 1298 * If in guest mode, vcpu->arch.efer actually refers to the L2 guest's 1299 * EFER.SVME, but EFER.SVME still has to be 1 for VMRUN to succeed. 1300 */ 1301 if (!(vcpu->arch.efer & EFER_SVME)) { 1302 /* GIF=1 and no guest mode are required if SVME=0. */ 1303 if (kvm_state->flags != KVM_STATE_NESTED_GIF_SET) 1304 return -EINVAL; 1305 } 1306 1307 /* SMM temporarily disables SVM, so we cannot be in guest mode. */ 1308 if (is_smm(vcpu) && (kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE)) 1309 return -EINVAL; 1310 1311 if (!(kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE)) { 1312 svm_leave_nested(svm); 1313 svm_set_gif(svm, !!(kvm_state->flags & KVM_STATE_NESTED_GIF_SET)); 1314 return 0; 1315 } 1316 1317 if (!page_address_valid(vcpu, kvm_state->hdr.svm.vmcb_pa)) 1318 return -EINVAL; 1319 if (kvm_state->size < sizeof(*kvm_state) + KVM_STATE_NESTED_SVM_VMCB_SIZE) 1320 return -EINVAL; 1321 1322 ret = -ENOMEM; 1323 ctl = kzalloc(sizeof(*ctl), GFP_KERNEL_ACCOUNT); 1324 save = kzalloc(sizeof(*save), GFP_KERNEL_ACCOUNT); 1325 if (!ctl || !save) 1326 goto out_free; 1327 1328 ret = -EFAULT; 1329 if (copy_from_user(ctl, &user_vmcb->control, sizeof(*ctl))) 1330 goto out_free; 1331 if (copy_from_user(save, &user_vmcb->save, sizeof(*save))) 1332 goto out_free; 1333 1334 ret = -EINVAL; 1335 if (!nested_vmcb_check_controls(vcpu, ctl)) 1336 goto out_free; 1337 1338 /* 1339 * Processor state contains L2 state. Check that it is 1340 * valid for guest mode (see nested_vmcb_check_save). 1341 */ 1342 cr0 = kvm_read_cr0(vcpu); 1343 if (((cr0 & X86_CR0_CD) == 0) && (cr0 & X86_CR0_NW)) 1344 goto out_free; 1345 1346 /* 1347 * Validate host state saved from before VMRUN (see 1348 * nested_svm_check_permissions). 1349 */ 1350 if (!(save->cr0 & X86_CR0_PG) || 1351 !(save->cr0 & X86_CR0_PE) || 1352 (save->rflags & X86_EFLAGS_VM) || 1353 !nested_vmcb_valid_sregs(vcpu, save)) 1354 goto out_free; 1355 1356 /* 1357 * While the nested guest CR3 is already checked and set by 1358 * KVM_SET_SREGS, it was set when nested state was yet loaded, 1359 * thus MMU might not be initialized correctly. 1360 * Set it again to fix this. 1361 */ 1362 1363 ret = nested_svm_load_cr3(&svm->vcpu, vcpu->arch.cr3, 1364 nested_npt_enabled(svm), false); 1365 if (WARN_ON_ONCE(ret)) 1366 goto out_free; 1367 1368 1369 /* 1370 * All checks done, we can enter guest mode. Userspace provides 1371 * vmcb12.control, which will be combined with L1 and stored into 1372 * vmcb02, and the L1 save state which we store in vmcb01. 1373 * L2 registers if needed are moved from the current VMCB to VMCB02. 1374 */ 1375 1376 if (is_guest_mode(vcpu)) 1377 svm_leave_nested(svm); 1378 else 1379 svm->nested.vmcb02.ptr->save = svm->vmcb01.ptr->save; 1380 1381 svm_set_gif(svm, !!(kvm_state->flags & KVM_STATE_NESTED_GIF_SET)); 1382 1383 svm->nested.nested_run_pending = 1384 !!(kvm_state->flags & KVM_STATE_NESTED_RUN_PENDING); 1385 1386 svm->nested.vmcb12_gpa = kvm_state->hdr.svm.vmcb_pa; 1387 1388 svm_copy_vmrun_state(save, &svm->vmcb01.ptr->save); 1389 nested_load_control_from_vmcb12(svm, ctl); 1390 1391 svm_switch_vmcb(svm, &svm->nested.vmcb02); 1392 nested_vmcb02_prepare_control(svm); 1393 kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu); 1394 ret = 0; 1395 out_free: 1396 kfree(save); 1397 kfree(ctl); 1398 1399 return ret; 1400 } 1401 1402 static bool svm_get_nested_state_pages(struct kvm_vcpu *vcpu) 1403 { 1404 struct vcpu_svm *svm = to_svm(vcpu); 1405 1406 if (WARN_ON(!is_guest_mode(vcpu))) 1407 return true; 1408 1409 if (!vcpu->arch.pdptrs_from_userspace && 1410 !nested_npt_enabled(svm) && is_pae_paging(vcpu)) 1411 /* 1412 * Reload the guest's PDPTRs since after a migration 1413 * the guest CR3 might be restored prior to setting the nested 1414 * state which can lead to a load of wrong PDPTRs. 1415 */ 1416 if (CC(!load_pdptrs(vcpu, vcpu->arch.walk_mmu, vcpu->arch.cr3))) 1417 return false; 1418 1419 if (!nested_svm_vmrun_msrpm(svm)) { 1420 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 1421 vcpu->run->internal.suberror = 1422 KVM_INTERNAL_ERROR_EMULATION; 1423 vcpu->run->internal.ndata = 0; 1424 return false; 1425 } 1426 1427 return true; 1428 } 1429 1430 struct kvm_x86_nested_ops svm_nested_ops = { 1431 .check_events = svm_check_nested_events, 1432 .triple_fault = nested_svm_triple_fault, 1433 .get_nested_state_pages = svm_get_nested_state_pages, 1434 .get_state = svm_get_nested_state, 1435 .set_state = svm_set_nested_state, 1436 }; 1437