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 vmcb_set_intercept(c, INTERCEPT_VMLOAD); 163 vmcb_set_intercept(c, INTERCEPT_VMSAVE); 164 } 165 166 static void copy_vmcb_control_area(struct vmcb_control_area *dst, 167 struct vmcb_control_area *from) 168 { 169 unsigned int i; 170 171 for (i = 0; i < MAX_INTERCEPT; i++) 172 dst->intercepts[i] = from->intercepts[i]; 173 174 dst->iopm_base_pa = from->iopm_base_pa; 175 dst->msrpm_base_pa = from->msrpm_base_pa; 176 dst->tsc_offset = from->tsc_offset; 177 /* asid not copied, it is handled manually for svm->vmcb. */ 178 dst->tlb_ctl = from->tlb_ctl; 179 dst->int_ctl = from->int_ctl; 180 dst->int_vector = from->int_vector; 181 dst->int_state = from->int_state; 182 dst->exit_code = from->exit_code; 183 dst->exit_code_hi = from->exit_code_hi; 184 dst->exit_info_1 = from->exit_info_1; 185 dst->exit_info_2 = from->exit_info_2; 186 dst->exit_int_info = from->exit_int_info; 187 dst->exit_int_info_err = from->exit_int_info_err; 188 dst->nested_ctl = from->nested_ctl; 189 dst->event_inj = from->event_inj; 190 dst->event_inj_err = from->event_inj_err; 191 dst->nested_cr3 = from->nested_cr3; 192 dst->virt_ext = from->virt_ext; 193 dst->pause_filter_count = from->pause_filter_count; 194 dst->pause_filter_thresh = from->pause_filter_thresh; 195 } 196 197 static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm) 198 { 199 /* 200 * This function merges the msr permission bitmaps of kvm and the 201 * nested vmcb. It is optimized in that it only merges the parts where 202 * the kvm msr permission bitmap may contain zero bits 203 */ 204 int i; 205 206 if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT))) 207 return true; 208 209 for (i = 0; i < MSRPM_OFFSETS; i++) { 210 u32 value, p; 211 u64 offset; 212 213 if (msrpm_offsets[i] == 0xffffffff) 214 break; 215 216 p = msrpm_offsets[i]; 217 offset = svm->nested.ctl.msrpm_base_pa + (p * 4); 218 219 if (kvm_vcpu_read_guest(&svm->vcpu, offset, &value, 4)) 220 return false; 221 222 svm->nested.msrpm[p] = svm->msrpm[p] | value; 223 } 224 225 svm->vmcb->control.msrpm_base_pa = __sme_set(__pa(svm->nested.msrpm)); 226 227 return true; 228 } 229 230 /* 231 * Bits 11:0 of bitmap address are ignored by hardware 232 */ 233 static bool nested_svm_check_bitmap_pa(struct kvm_vcpu *vcpu, u64 pa, u32 size) 234 { 235 u64 addr = PAGE_ALIGN(pa); 236 237 return kvm_vcpu_is_legal_gpa(vcpu, addr) && 238 kvm_vcpu_is_legal_gpa(vcpu, addr + size - 1); 239 } 240 241 static bool nested_vmcb_check_controls(struct kvm_vcpu *vcpu, 242 struct vmcb_control_area *control) 243 { 244 if (CC(!vmcb_is_intercept(control, INTERCEPT_VMRUN))) 245 return false; 246 247 if (CC(control->asid == 0)) 248 return false; 249 250 if (CC((control->nested_ctl & SVM_NESTED_CTL_NP_ENABLE) && !npt_enabled)) 251 return false; 252 253 if (CC(!nested_svm_check_bitmap_pa(vcpu, control->msrpm_base_pa, 254 MSRPM_SIZE))) 255 return false; 256 if (CC(!nested_svm_check_bitmap_pa(vcpu, control->iopm_base_pa, 257 IOPM_SIZE))) 258 return false; 259 260 return true; 261 } 262 263 static bool nested_vmcb_check_cr3_cr4(struct kvm_vcpu *vcpu, 264 struct vmcb_save_area *save) 265 { 266 /* 267 * These checks are also performed by KVM_SET_SREGS, 268 * except that EFER.LMA is not checked by SVM against 269 * CR0.PG && EFER.LME. 270 */ 271 if ((save->efer & EFER_LME) && (save->cr0 & X86_CR0_PG)) { 272 if (CC(!(save->cr4 & X86_CR4_PAE)) || 273 CC(!(save->cr0 & X86_CR0_PE)) || 274 CC(kvm_vcpu_is_illegal_gpa(vcpu, save->cr3))) 275 return false; 276 } 277 278 if (CC(!kvm_is_valid_cr4(vcpu, save->cr4))) 279 return false; 280 281 return true; 282 } 283 284 /* Common checks that apply to both L1 and L2 state. */ 285 static bool nested_vmcb_valid_sregs(struct kvm_vcpu *vcpu, 286 struct vmcb_save_area *save) 287 { 288 /* 289 * FIXME: these should be done after copying the fields, 290 * to avoid TOC/TOU races. For these save area checks 291 * the possible damage is limited since kvm_set_cr0 and 292 * kvm_set_cr4 handle failure; EFER_SVME is an exception 293 * so it is force-set later in nested_prepare_vmcb_save. 294 */ 295 if (CC(!(save->efer & EFER_SVME))) 296 return false; 297 298 if (CC((save->cr0 & X86_CR0_CD) == 0 && (save->cr0 & X86_CR0_NW)) || 299 CC(save->cr0 & ~0xffffffffULL)) 300 return false; 301 302 if (CC(!kvm_dr6_valid(save->dr6)) || CC(!kvm_dr7_valid(save->dr7))) 303 return false; 304 305 if (!nested_vmcb_check_cr3_cr4(vcpu, save)) 306 return false; 307 308 if (CC(!kvm_valid_efer(vcpu, save->efer))) 309 return false; 310 311 return true; 312 } 313 314 void nested_load_control_from_vmcb12(struct vcpu_svm *svm, 315 struct vmcb_control_area *control) 316 { 317 copy_vmcb_control_area(&svm->nested.ctl, control); 318 319 /* Copy it here because nested_svm_check_controls will check it. */ 320 svm->nested.ctl.asid = control->asid; 321 svm->nested.ctl.msrpm_base_pa &= ~0x0fffULL; 322 svm->nested.ctl.iopm_base_pa &= ~0x0fffULL; 323 } 324 325 /* 326 * Synchronize fields that are written by the processor, so that 327 * they can be copied back into the vmcb12. 328 */ 329 void nested_sync_control_from_vmcb02(struct vcpu_svm *svm) 330 { 331 u32 mask; 332 svm->nested.ctl.event_inj = svm->vmcb->control.event_inj; 333 svm->nested.ctl.event_inj_err = svm->vmcb->control.event_inj_err; 334 335 /* Only a few fields of int_ctl are written by the processor. */ 336 mask = V_IRQ_MASK | V_TPR_MASK; 337 if (!(svm->nested.ctl.int_ctl & V_INTR_MASKING_MASK) && 338 svm_is_intercept(svm, INTERCEPT_VINTR)) { 339 /* 340 * In order to request an interrupt window, L0 is usurping 341 * svm->vmcb->control.int_ctl and possibly setting V_IRQ 342 * even if it was clear in L1's VMCB. Restoring it would be 343 * wrong. However, in this case V_IRQ will remain true until 344 * interrupt_window_interception calls svm_clear_vintr and 345 * restores int_ctl. We can just leave it aside. 346 */ 347 mask &= ~V_IRQ_MASK; 348 } 349 svm->nested.ctl.int_ctl &= ~mask; 350 svm->nested.ctl.int_ctl |= svm->vmcb->control.int_ctl & mask; 351 } 352 353 /* 354 * Transfer any event that L0 or L1 wanted to inject into L2 to 355 * EXIT_INT_INFO. 356 */ 357 static void nested_save_pending_event_to_vmcb12(struct vcpu_svm *svm, 358 struct vmcb *vmcb12) 359 { 360 struct kvm_vcpu *vcpu = &svm->vcpu; 361 u32 exit_int_info = 0; 362 unsigned int nr; 363 364 if (vcpu->arch.exception.injected) { 365 nr = vcpu->arch.exception.nr; 366 exit_int_info = nr | SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_EXEPT; 367 368 if (vcpu->arch.exception.has_error_code) { 369 exit_int_info |= SVM_EVTINJ_VALID_ERR; 370 vmcb12->control.exit_int_info_err = 371 vcpu->arch.exception.error_code; 372 } 373 374 } else if (vcpu->arch.nmi_injected) { 375 exit_int_info = SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_NMI; 376 377 } else if (vcpu->arch.interrupt.injected) { 378 nr = vcpu->arch.interrupt.nr; 379 exit_int_info = nr | SVM_EVTINJ_VALID; 380 381 if (vcpu->arch.interrupt.soft) 382 exit_int_info |= SVM_EVTINJ_TYPE_SOFT; 383 else 384 exit_int_info |= SVM_EVTINJ_TYPE_INTR; 385 } 386 387 vmcb12->control.exit_int_info = exit_int_info; 388 } 389 390 static inline bool nested_npt_enabled(struct vcpu_svm *svm) 391 { 392 return svm->nested.ctl.nested_ctl & SVM_NESTED_CTL_NP_ENABLE; 393 } 394 395 static void nested_svm_transition_tlb_flush(struct kvm_vcpu *vcpu) 396 { 397 /* 398 * TODO: optimize unconditional TLB flush/MMU sync. A partial list of 399 * things to fix before this can be conditional: 400 * 401 * - Flush TLBs for both L1 and L2 remote TLB flush 402 * - Honor L1's request to flush an ASID on nested VMRUN 403 * - Sync nested NPT MMU on VMRUN that flushes L2's ASID[*] 404 * - Don't crush a pending TLB flush in vmcb02 on nested VMRUN 405 * - Flush L1's ASID on KVM_REQ_TLB_FLUSH_GUEST 406 * 407 * [*] Unlike nested EPT, SVM's ASID management can invalidate nested 408 * NPT guest-physical mappings on VMRUN. 409 */ 410 kvm_make_request(KVM_REQ_MMU_SYNC, vcpu); 411 kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu); 412 } 413 414 /* 415 * Load guest's/host's cr3 on nested vmentry or vmexit. @nested_npt is true 416 * if we are emulating VM-Entry into a guest with NPT enabled. 417 */ 418 static int nested_svm_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3, 419 bool nested_npt, bool reload_pdptrs) 420 { 421 if (CC(kvm_vcpu_is_illegal_gpa(vcpu, cr3))) 422 return -EINVAL; 423 424 if (reload_pdptrs && !nested_npt && is_pae_paging(vcpu) && 425 CC(!load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3))) 426 return -EINVAL; 427 428 if (!nested_npt) 429 kvm_mmu_new_pgd(vcpu, cr3); 430 431 vcpu->arch.cr3 = cr3; 432 kvm_register_mark_available(vcpu, VCPU_EXREG_CR3); 433 434 /* Re-initialize the MMU, e.g. to pick up CR4 MMU role changes. */ 435 kvm_init_mmu(vcpu); 436 437 return 0; 438 } 439 440 void nested_vmcb02_compute_g_pat(struct vcpu_svm *svm) 441 { 442 if (!svm->nested.vmcb02.ptr) 443 return; 444 445 /* FIXME: merge g_pat from vmcb01 and vmcb12. */ 446 svm->nested.vmcb02.ptr->save.g_pat = svm->vmcb01.ptr->save.g_pat; 447 } 448 449 static void nested_vmcb02_prepare_save(struct vcpu_svm *svm, struct vmcb *vmcb12) 450 { 451 bool new_vmcb12 = false; 452 453 nested_vmcb02_compute_g_pat(svm); 454 455 /* Load the nested guest state */ 456 if (svm->nested.vmcb12_gpa != svm->nested.last_vmcb12_gpa) { 457 new_vmcb12 = true; 458 svm->nested.last_vmcb12_gpa = svm->nested.vmcb12_gpa; 459 } 460 461 if (unlikely(new_vmcb12 || vmcb_is_dirty(vmcb12, VMCB_SEG))) { 462 svm->vmcb->save.es = vmcb12->save.es; 463 svm->vmcb->save.cs = vmcb12->save.cs; 464 svm->vmcb->save.ss = vmcb12->save.ss; 465 svm->vmcb->save.ds = vmcb12->save.ds; 466 svm->vmcb->save.cpl = vmcb12->save.cpl; 467 vmcb_mark_dirty(svm->vmcb, VMCB_SEG); 468 } 469 470 if (unlikely(new_vmcb12 || vmcb_is_dirty(vmcb12, VMCB_DT))) { 471 svm->vmcb->save.gdtr = vmcb12->save.gdtr; 472 svm->vmcb->save.idtr = vmcb12->save.idtr; 473 vmcb_mark_dirty(svm->vmcb, VMCB_DT); 474 } 475 476 kvm_set_rflags(&svm->vcpu, vmcb12->save.rflags | X86_EFLAGS_FIXED); 477 478 /* 479 * Force-set EFER_SVME even though it is checked earlier on the 480 * VMCB12, because the guest can flip the bit between the check 481 * and now. Clearing EFER_SVME would call svm_free_nested. 482 */ 483 svm_set_efer(&svm->vcpu, vmcb12->save.efer | EFER_SVME); 484 485 svm_set_cr0(&svm->vcpu, vmcb12->save.cr0); 486 svm_set_cr4(&svm->vcpu, vmcb12->save.cr4); 487 488 svm->vcpu.arch.cr2 = vmcb12->save.cr2; 489 490 kvm_rax_write(&svm->vcpu, vmcb12->save.rax); 491 kvm_rsp_write(&svm->vcpu, vmcb12->save.rsp); 492 kvm_rip_write(&svm->vcpu, vmcb12->save.rip); 493 494 /* In case we don't even reach vcpu_run, the fields are not updated */ 495 svm->vmcb->save.rax = vmcb12->save.rax; 496 svm->vmcb->save.rsp = vmcb12->save.rsp; 497 svm->vmcb->save.rip = vmcb12->save.rip; 498 499 /* These bits will be set properly on the first execution when new_vmc12 is true */ 500 if (unlikely(new_vmcb12 || vmcb_is_dirty(vmcb12, VMCB_DR))) { 501 svm->vmcb->save.dr7 = vmcb12->save.dr7 | DR7_FIXED_1; 502 svm->vcpu.arch.dr6 = vmcb12->save.dr6 | DR6_ACTIVE_LOW; 503 vmcb_mark_dirty(svm->vmcb, VMCB_DR); 504 } 505 } 506 507 static void nested_vmcb02_prepare_control(struct vcpu_svm *svm) 508 { 509 const u32 int_ctl_vmcb01_bits = 510 V_INTR_MASKING_MASK | V_GIF_MASK | V_GIF_ENABLE_MASK; 511 512 const u32 int_ctl_vmcb12_bits = V_TPR_MASK | V_IRQ_INJECTION_BITS_MASK; 513 514 struct kvm_vcpu *vcpu = &svm->vcpu; 515 516 /* 517 * Filled at exit: exit_code, exit_code_hi, exit_info_1, exit_info_2, 518 * exit_int_info, exit_int_info_err, next_rip, insn_len, insn_bytes. 519 */ 520 521 /* 522 * Also covers avic_vapic_bar, avic_backing_page, avic_logical_id, 523 * avic_physical_id. 524 */ 525 WARN_ON(kvm_apicv_activated(svm->vcpu.kvm)); 526 527 /* Copied from vmcb01. msrpm_base can be overwritten later. */ 528 svm->vmcb->control.nested_ctl = svm->vmcb01.ptr->control.nested_ctl; 529 svm->vmcb->control.iopm_base_pa = svm->vmcb01.ptr->control.iopm_base_pa; 530 svm->vmcb->control.msrpm_base_pa = svm->vmcb01.ptr->control.msrpm_base_pa; 531 532 /* Done at vmrun: asid. */ 533 534 /* Also overwritten later if necessary. */ 535 svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING; 536 537 /* nested_cr3. */ 538 if (nested_npt_enabled(svm)) 539 nested_svm_init_mmu_context(vcpu); 540 541 svm->vmcb->control.tsc_offset = vcpu->arch.tsc_offset = 542 vcpu->arch.l1_tsc_offset + svm->nested.ctl.tsc_offset; 543 544 svm->vmcb->control.int_ctl = 545 (svm->nested.ctl.int_ctl & int_ctl_vmcb12_bits) | 546 (svm->vmcb01.ptr->control.int_ctl & int_ctl_vmcb01_bits); 547 548 svm->vmcb->control.virt_ext = svm->nested.ctl.virt_ext; 549 svm->vmcb->control.int_vector = svm->nested.ctl.int_vector; 550 svm->vmcb->control.int_state = svm->nested.ctl.int_state; 551 svm->vmcb->control.event_inj = svm->nested.ctl.event_inj; 552 svm->vmcb->control.event_inj_err = svm->nested.ctl.event_inj_err; 553 554 svm->vmcb->control.pause_filter_count = svm->nested.ctl.pause_filter_count; 555 svm->vmcb->control.pause_filter_thresh = svm->nested.ctl.pause_filter_thresh; 556 557 nested_svm_transition_tlb_flush(vcpu); 558 559 /* Enter Guest-Mode */ 560 enter_guest_mode(vcpu); 561 562 /* 563 * Merge guest and host intercepts - must be called with vcpu in 564 * guest-mode to take effect. 565 */ 566 recalc_intercepts(svm); 567 } 568 569 static void nested_svm_copy_common_state(struct vmcb *from_vmcb, struct vmcb *to_vmcb) 570 { 571 /* 572 * Some VMCB state is shared between L1 and L2 and thus has to be 573 * moved at the time of nested vmrun and vmexit. 574 * 575 * VMLOAD/VMSAVE state would also belong in this category, but KVM 576 * always performs VMLOAD and VMSAVE from the VMCB01. 577 */ 578 to_vmcb->save.spec_ctrl = from_vmcb->save.spec_ctrl; 579 } 580 581 int enter_svm_guest_mode(struct kvm_vcpu *vcpu, u64 vmcb12_gpa, 582 struct vmcb *vmcb12) 583 { 584 struct vcpu_svm *svm = to_svm(vcpu); 585 int ret; 586 587 trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb12_gpa, 588 vmcb12->save.rip, 589 vmcb12->control.int_ctl, 590 vmcb12->control.event_inj, 591 vmcb12->control.nested_ctl); 592 593 trace_kvm_nested_intercepts(vmcb12->control.intercepts[INTERCEPT_CR] & 0xffff, 594 vmcb12->control.intercepts[INTERCEPT_CR] >> 16, 595 vmcb12->control.intercepts[INTERCEPT_EXCEPTION], 596 vmcb12->control.intercepts[INTERCEPT_WORD3], 597 vmcb12->control.intercepts[INTERCEPT_WORD4], 598 vmcb12->control.intercepts[INTERCEPT_WORD5]); 599 600 601 svm->nested.vmcb12_gpa = vmcb12_gpa; 602 603 WARN_ON(svm->vmcb == svm->nested.vmcb02.ptr); 604 605 nested_svm_copy_common_state(svm->vmcb01.ptr, svm->nested.vmcb02.ptr); 606 607 svm_switch_vmcb(svm, &svm->nested.vmcb02); 608 nested_vmcb02_prepare_control(svm); 609 nested_vmcb02_prepare_save(svm, vmcb12); 610 611 ret = nested_svm_load_cr3(&svm->vcpu, vmcb12->save.cr3, 612 nested_npt_enabled(svm), true); 613 if (ret) 614 return ret; 615 616 if (!npt_enabled) 617 vcpu->arch.mmu->inject_page_fault = svm_inject_page_fault_nested; 618 619 svm_set_gif(svm, true); 620 621 return 0; 622 } 623 624 int nested_svm_vmrun(struct kvm_vcpu *vcpu) 625 { 626 struct vcpu_svm *svm = to_svm(vcpu); 627 int ret; 628 struct vmcb *vmcb12; 629 struct kvm_host_map map; 630 u64 vmcb12_gpa; 631 632 if (!svm->nested.hsave_msr) { 633 kvm_inject_gp(vcpu, 0); 634 return 1; 635 } 636 637 if (is_smm(vcpu)) { 638 kvm_queue_exception(vcpu, UD_VECTOR); 639 return 1; 640 } 641 642 vmcb12_gpa = svm->vmcb->save.rax; 643 ret = kvm_vcpu_map(vcpu, gpa_to_gfn(vmcb12_gpa), &map); 644 if (ret == -EINVAL) { 645 kvm_inject_gp(vcpu, 0); 646 return 1; 647 } else if (ret) { 648 return kvm_skip_emulated_instruction(vcpu); 649 } 650 651 ret = kvm_skip_emulated_instruction(vcpu); 652 653 vmcb12 = map.hva; 654 655 if (WARN_ON_ONCE(!svm->nested.initialized)) 656 return -EINVAL; 657 658 nested_load_control_from_vmcb12(svm, &vmcb12->control); 659 660 if (!nested_vmcb_valid_sregs(vcpu, &vmcb12->save) || 661 !nested_vmcb_check_controls(vcpu, &svm->nested.ctl)) { 662 vmcb12->control.exit_code = SVM_EXIT_ERR; 663 vmcb12->control.exit_code_hi = 0; 664 vmcb12->control.exit_info_1 = 0; 665 vmcb12->control.exit_info_2 = 0; 666 goto out; 667 } 668 669 670 /* Clear internal status */ 671 kvm_clear_exception_queue(vcpu); 672 kvm_clear_interrupt_queue(vcpu); 673 674 /* 675 * Since vmcb01 is not in use, we can use it to store some of the L1 676 * state. 677 */ 678 svm->vmcb01.ptr->save.efer = vcpu->arch.efer; 679 svm->vmcb01.ptr->save.cr0 = kvm_read_cr0(vcpu); 680 svm->vmcb01.ptr->save.cr4 = vcpu->arch.cr4; 681 svm->vmcb01.ptr->save.rflags = kvm_get_rflags(vcpu); 682 svm->vmcb01.ptr->save.rip = kvm_rip_read(vcpu); 683 684 if (!npt_enabled) 685 svm->vmcb01.ptr->save.cr3 = kvm_read_cr3(vcpu); 686 687 svm->nested.nested_run_pending = 1; 688 689 if (enter_svm_guest_mode(vcpu, vmcb12_gpa, vmcb12)) 690 goto out_exit_err; 691 692 if (nested_svm_vmrun_msrpm(svm)) 693 goto out; 694 695 out_exit_err: 696 svm->nested.nested_run_pending = 0; 697 698 svm->vmcb->control.exit_code = SVM_EXIT_ERR; 699 svm->vmcb->control.exit_code_hi = 0; 700 svm->vmcb->control.exit_info_1 = 0; 701 svm->vmcb->control.exit_info_2 = 0; 702 703 nested_svm_vmexit(svm); 704 705 out: 706 kvm_vcpu_unmap(vcpu, &map, true); 707 708 return ret; 709 } 710 711 /* Copy state save area fields which are handled by VMRUN */ 712 void svm_copy_vmrun_state(struct vmcb_save_area *to_save, 713 struct vmcb_save_area *from_save) 714 { 715 to_save->es = from_save->es; 716 to_save->cs = from_save->cs; 717 to_save->ss = from_save->ss; 718 to_save->ds = from_save->ds; 719 to_save->gdtr = from_save->gdtr; 720 to_save->idtr = from_save->idtr; 721 to_save->rflags = from_save->rflags | X86_EFLAGS_FIXED; 722 to_save->efer = from_save->efer; 723 to_save->cr0 = from_save->cr0; 724 to_save->cr3 = from_save->cr3; 725 to_save->cr4 = from_save->cr4; 726 to_save->rax = from_save->rax; 727 to_save->rsp = from_save->rsp; 728 to_save->rip = from_save->rip; 729 to_save->cpl = 0; 730 } 731 732 void svm_copy_vmloadsave_state(struct vmcb *to_vmcb, struct vmcb *from_vmcb) 733 { 734 to_vmcb->save.fs = from_vmcb->save.fs; 735 to_vmcb->save.gs = from_vmcb->save.gs; 736 to_vmcb->save.tr = from_vmcb->save.tr; 737 to_vmcb->save.ldtr = from_vmcb->save.ldtr; 738 to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base; 739 to_vmcb->save.star = from_vmcb->save.star; 740 to_vmcb->save.lstar = from_vmcb->save.lstar; 741 to_vmcb->save.cstar = from_vmcb->save.cstar; 742 to_vmcb->save.sfmask = from_vmcb->save.sfmask; 743 to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs; 744 to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp; 745 to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip; 746 } 747 748 int nested_svm_vmexit(struct vcpu_svm *svm) 749 { 750 struct kvm_vcpu *vcpu = &svm->vcpu; 751 struct vmcb *vmcb12; 752 struct vmcb *vmcb = svm->vmcb; 753 struct kvm_host_map map; 754 int rc; 755 756 /* Triple faults in L2 should never escape. */ 757 WARN_ON_ONCE(kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)); 758 759 rc = kvm_vcpu_map(vcpu, gpa_to_gfn(svm->nested.vmcb12_gpa), &map); 760 if (rc) { 761 if (rc == -EINVAL) 762 kvm_inject_gp(vcpu, 0); 763 return 1; 764 } 765 766 vmcb12 = map.hva; 767 768 /* Exit Guest-Mode */ 769 leave_guest_mode(vcpu); 770 svm->nested.vmcb12_gpa = 0; 771 WARN_ON_ONCE(svm->nested.nested_run_pending); 772 773 kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu); 774 775 /* in case we halted in L2 */ 776 svm->vcpu.arch.mp_state = KVM_MP_STATE_RUNNABLE; 777 778 /* Give the current vmcb to the guest */ 779 780 vmcb12->save.es = vmcb->save.es; 781 vmcb12->save.cs = vmcb->save.cs; 782 vmcb12->save.ss = vmcb->save.ss; 783 vmcb12->save.ds = vmcb->save.ds; 784 vmcb12->save.gdtr = vmcb->save.gdtr; 785 vmcb12->save.idtr = vmcb->save.idtr; 786 vmcb12->save.efer = svm->vcpu.arch.efer; 787 vmcb12->save.cr0 = kvm_read_cr0(vcpu); 788 vmcb12->save.cr3 = kvm_read_cr3(vcpu); 789 vmcb12->save.cr2 = vmcb->save.cr2; 790 vmcb12->save.cr4 = svm->vcpu.arch.cr4; 791 vmcb12->save.rflags = kvm_get_rflags(vcpu); 792 vmcb12->save.rip = kvm_rip_read(vcpu); 793 vmcb12->save.rsp = kvm_rsp_read(vcpu); 794 vmcb12->save.rax = kvm_rax_read(vcpu); 795 vmcb12->save.dr7 = vmcb->save.dr7; 796 vmcb12->save.dr6 = svm->vcpu.arch.dr6; 797 vmcb12->save.cpl = vmcb->save.cpl; 798 799 vmcb12->control.int_state = vmcb->control.int_state; 800 vmcb12->control.exit_code = vmcb->control.exit_code; 801 vmcb12->control.exit_code_hi = vmcb->control.exit_code_hi; 802 vmcb12->control.exit_info_1 = vmcb->control.exit_info_1; 803 vmcb12->control.exit_info_2 = vmcb->control.exit_info_2; 804 805 if (vmcb12->control.exit_code != SVM_EXIT_ERR) 806 nested_save_pending_event_to_vmcb12(svm, vmcb12); 807 808 if (svm->nrips_enabled) 809 vmcb12->control.next_rip = vmcb->control.next_rip; 810 811 vmcb12->control.int_ctl = svm->nested.ctl.int_ctl; 812 vmcb12->control.tlb_ctl = svm->nested.ctl.tlb_ctl; 813 vmcb12->control.event_inj = svm->nested.ctl.event_inj; 814 vmcb12->control.event_inj_err = svm->nested.ctl.event_inj_err; 815 816 vmcb12->control.pause_filter_count = 817 svm->vmcb->control.pause_filter_count; 818 vmcb12->control.pause_filter_thresh = 819 svm->vmcb->control.pause_filter_thresh; 820 821 nested_svm_copy_common_state(svm->nested.vmcb02.ptr, svm->vmcb01.ptr); 822 823 svm_switch_vmcb(svm, &svm->vmcb01); 824 825 /* 826 * On vmexit the GIF is set to false and 827 * no event can be injected in L1. 828 */ 829 svm_set_gif(svm, false); 830 svm->vmcb->control.exit_int_info = 0; 831 832 svm->vcpu.arch.tsc_offset = svm->vcpu.arch.l1_tsc_offset; 833 if (svm->vmcb->control.tsc_offset != svm->vcpu.arch.tsc_offset) { 834 svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset; 835 vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS); 836 } 837 838 svm->nested.ctl.nested_cr3 = 0; 839 840 /* 841 * Restore processor state that had been saved in vmcb01 842 */ 843 kvm_set_rflags(vcpu, svm->vmcb->save.rflags); 844 svm_set_efer(vcpu, svm->vmcb->save.efer); 845 svm_set_cr0(vcpu, svm->vmcb->save.cr0 | X86_CR0_PE); 846 svm_set_cr4(vcpu, svm->vmcb->save.cr4); 847 kvm_rax_write(vcpu, svm->vmcb->save.rax); 848 kvm_rsp_write(vcpu, svm->vmcb->save.rsp); 849 kvm_rip_write(vcpu, svm->vmcb->save.rip); 850 851 svm->vcpu.arch.dr7 = DR7_FIXED_1; 852 kvm_update_dr7(&svm->vcpu); 853 854 trace_kvm_nested_vmexit_inject(vmcb12->control.exit_code, 855 vmcb12->control.exit_info_1, 856 vmcb12->control.exit_info_2, 857 vmcb12->control.exit_int_info, 858 vmcb12->control.exit_int_info_err, 859 KVM_ISA_SVM); 860 861 kvm_vcpu_unmap(vcpu, &map, true); 862 863 nested_svm_transition_tlb_flush(vcpu); 864 865 nested_svm_uninit_mmu_context(vcpu); 866 867 rc = nested_svm_load_cr3(vcpu, svm->vmcb->save.cr3, false, true); 868 if (rc) 869 return 1; 870 871 /* 872 * Drop what we picked up for L2 via svm_complete_interrupts() so it 873 * doesn't end up in L1. 874 */ 875 svm->vcpu.arch.nmi_injected = false; 876 kvm_clear_exception_queue(vcpu); 877 kvm_clear_interrupt_queue(vcpu); 878 879 /* 880 * If we are here following the completion of a VMRUN that 881 * is being single-stepped, queue the pending #DB intercept 882 * right now so that it an be accounted for before we execute 883 * L1's next instruction. 884 */ 885 if (unlikely(svm->vmcb->save.rflags & X86_EFLAGS_TF)) 886 kvm_queue_exception(&(svm->vcpu), DB_VECTOR); 887 888 return 0; 889 } 890 891 static void nested_svm_triple_fault(struct kvm_vcpu *vcpu) 892 { 893 nested_svm_simple_vmexit(to_svm(vcpu), SVM_EXIT_SHUTDOWN); 894 } 895 896 int svm_allocate_nested(struct vcpu_svm *svm) 897 { 898 struct page *vmcb02_page; 899 900 if (svm->nested.initialized) 901 return 0; 902 903 vmcb02_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO); 904 if (!vmcb02_page) 905 return -ENOMEM; 906 svm->nested.vmcb02.ptr = page_address(vmcb02_page); 907 svm->nested.vmcb02.pa = __sme_set(page_to_pfn(vmcb02_page) << PAGE_SHIFT); 908 909 svm->nested.msrpm = svm_vcpu_alloc_msrpm(); 910 if (!svm->nested.msrpm) 911 goto err_free_vmcb02; 912 svm_vcpu_init_msrpm(&svm->vcpu, svm->nested.msrpm); 913 914 svm->nested.initialized = true; 915 return 0; 916 917 err_free_vmcb02: 918 __free_page(vmcb02_page); 919 return -ENOMEM; 920 } 921 922 void svm_free_nested(struct vcpu_svm *svm) 923 { 924 if (!svm->nested.initialized) 925 return; 926 927 svm_vcpu_free_msrpm(svm->nested.msrpm); 928 svm->nested.msrpm = NULL; 929 930 __free_page(virt_to_page(svm->nested.vmcb02.ptr)); 931 svm->nested.vmcb02.ptr = NULL; 932 933 /* 934 * When last_vmcb12_gpa matches the current vmcb12 gpa, 935 * some vmcb12 fields are not loaded if they are marked clean 936 * in the vmcb12, since in this case they are up to date already. 937 * 938 * When the vmcb02 is freed, this optimization becomes invalid. 939 */ 940 svm->nested.last_vmcb12_gpa = INVALID_GPA; 941 942 svm->nested.initialized = false; 943 } 944 945 /* 946 * Forcibly leave nested mode in order to be able to reset the VCPU later on. 947 */ 948 void svm_leave_nested(struct vcpu_svm *svm) 949 { 950 struct kvm_vcpu *vcpu = &svm->vcpu; 951 952 if (is_guest_mode(vcpu)) { 953 svm->nested.nested_run_pending = 0; 954 svm->nested.vmcb12_gpa = INVALID_GPA; 955 956 leave_guest_mode(vcpu); 957 958 svm_switch_vmcb(svm, &svm->vmcb01); 959 960 nested_svm_uninit_mmu_context(vcpu); 961 vmcb_mark_all_dirty(svm->vmcb); 962 } 963 964 kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu); 965 } 966 967 static int nested_svm_exit_handled_msr(struct vcpu_svm *svm) 968 { 969 u32 offset, msr, value; 970 int write, mask; 971 972 if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT))) 973 return NESTED_EXIT_HOST; 974 975 msr = svm->vcpu.arch.regs[VCPU_REGS_RCX]; 976 offset = svm_msrpm_offset(msr); 977 write = svm->vmcb->control.exit_info_1 & 1; 978 mask = 1 << ((2 * (msr & 0xf)) + write); 979 980 if (offset == MSR_INVALID) 981 return NESTED_EXIT_DONE; 982 983 /* Offset is in 32 bit units but need in 8 bit units */ 984 offset *= 4; 985 986 if (kvm_vcpu_read_guest(&svm->vcpu, svm->nested.ctl.msrpm_base_pa + offset, &value, 4)) 987 return NESTED_EXIT_DONE; 988 989 return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST; 990 } 991 992 static int nested_svm_intercept_ioio(struct vcpu_svm *svm) 993 { 994 unsigned port, size, iopm_len; 995 u16 val, mask; 996 u8 start_bit; 997 u64 gpa; 998 999 if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_IOIO_PROT))) 1000 return NESTED_EXIT_HOST; 1001 1002 port = svm->vmcb->control.exit_info_1 >> 16; 1003 size = (svm->vmcb->control.exit_info_1 & SVM_IOIO_SIZE_MASK) >> 1004 SVM_IOIO_SIZE_SHIFT; 1005 gpa = svm->nested.ctl.iopm_base_pa + (port / 8); 1006 start_bit = port % 8; 1007 iopm_len = (start_bit + size > 8) ? 2 : 1; 1008 mask = (0xf >> (4 - size)) << start_bit; 1009 val = 0; 1010 1011 if (kvm_vcpu_read_guest(&svm->vcpu, gpa, &val, iopm_len)) 1012 return NESTED_EXIT_DONE; 1013 1014 return (val & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST; 1015 } 1016 1017 static int nested_svm_intercept(struct vcpu_svm *svm) 1018 { 1019 u32 exit_code = svm->vmcb->control.exit_code; 1020 int vmexit = NESTED_EXIT_HOST; 1021 1022 switch (exit_code) { 1023 case SVM_EXIT_MSR: 1024 vmexit = nested_svm_exit_handled_msr(svm); 1025 break; 1026 case SVM_EXIT_IOIO: 1027 vmexit = nested_svm_intercept_ioio(svm); 1028 break; 1029 case SVM_EXIT_READ_CR0 ... SVM_EXIT_WRITE_CR8: { 1030 if (vmcb_is_intercept(&svm->nested.ctl, exit_code)) 1031 vmexit = NESTED_EXIT_DONE; 1032 break; 1033 } 1034 case SVM_EXIT_READ_DR0 ... SVM_EXIT_WRITE_DR7: { 1035 if (vmcb_is_intercept(&svm->nested.ctl, exit_code)) 1036 vmexit = NESTED_EXIT_DONE; 1037 break; 1038 } 1039 case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: { 1040 /* 1041 * Host-intercepted exceptions have been checked already in 1042 * nested_svm_exit_special. There is nothing to do here, 1043 * the vmexit is injected by svm_check_nested_events. 1044 */ 1045 vmexit = NESTED_EXIT_DONE; 1046 break; 1047 } 1048 case SVM_EXIT_ERR: { 1049 vmexit = NESTED_EXIT_DONE; 1050 break; 1051 } 1052 default: { 1053 if (vmcb_is_intercept(&svm->nested.ctl, exit_code)) 1054 vmexit = NESTED_EXIT_DONE; 1055 } 1056 } 1057 1058 return vmexit; 1059 } 1060 1061 int nested_svm_exit_handled(struct vcpu_svm *svm) 1062 { 1063 int vmexit; 1064 1065 vmexit = nested_svm_intercept(svm); 1066 1067 if (vmexit == NESTED_EXIT_DONE) 1068 nested_svm_vmexit(svm); 1069 1070 return vmexit; 1071 } 1072 1073 int nested_svm_check_permissions(struct kvm_vcpu *vcpu) 1074 { 1075 if (!(vcpu->arch.efer & EFER_SVME) || !is_paging(vcpu)) { 1076 kvm_queue_exception(vcpu, UD_VECTOR); 1077 return 1; 1078 } 1079 1080 if (to_svm(vcpu)->vmcb->save.cpl) { 1081 kvm_inject_gp(vcpu, 0); 1082 return 1; 1083 } 1084 1085 return 0; 1086 } 1087 1088 static bool nested_exit_on_exception(struct vcpu_svm *svm) 1089 { 1090 unsigned int nr = svm->vcpu.arch.exception.nr; 1091 1092 return (svm->nested.ctl.intercepts[INTERCEPT_EXCEPTION] & BIT(nr)); 1093 } 1094 1095 static void nested_svm_inject_exception_vmexit(struct vcpu_svm *svm) 1096 { 1097 unsigned int nr = svm->vcpu.arch.exception.nr; 1098 1099 svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr; 1100 svm->vmcb->control.exit_code_hi = 0; 1101 1102 if (svm->vcpu.arch.exception.has_error_code) 1103 svm->vmcb->control.exit_info_1 = svm->vcpu.arch.exception.error_code; 1104 1105 /* 1106 * EXITINFO2 is undefined for all exception intercepts other 1107 * than #PF. 1108 */ 1109 if (nr == PF_VECTOR) { 1110 if (svm->vcpu.arch.exception.nested_apf) 1111 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.apf.nested_apf_token; 1112 else if (svm->vcpu.arch.exception.has_payload) 1113 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.exception.payload; 1114 else 1115 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2; 1116 } else if (nr == DB_VECTOR) { 1117 /* See inject_pending_event. */ 1118 kvm_deliver_exception_payload(&svm->vcpu); 1119 if (svm->vcpu.arch.dr7 & DR7_GD) { 1120 svm->vcpu.arch.dr7 &= ~DR7_GD; 1121 kvm_update_dr7(&svm->vcpu); 1122 } 1123 } else 1124 WARN_ON(svm->vcpu.arch.exception.has_payload); 1125 1126 nested_svm_vmexit(svm); 1127 } 1128 1129 static inline bool nested_exit_on_init(struct vcpu_svm *svm) 1130 { 1131 return vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_INIT); 1132 } 1133 1134 static int svm_check_nested_events(struct kvm_vcpu *vcpu) 1135 { 1136 struct vcpu_svm *svm = to_svm(vcpu); 1137 bool block_nested_events = 1138 kvm_event_needs_reinjection(vcpu) || svm->nested.nested_run_pending; 1139 struct kvm_lapic *apic = vcpu->arch.apic; 1140 1141 if (lapic_in_kernel(vcpu) && 1142 test_bit(KVM_APIC_INIT, &apic->pending_events)) { 1143 if (block_nested_events) 1144 return -EBUSY; 1145 if (!nested_exit_on_init(svm)) 1146 return 0; 1147 nested_svm_simple_vmexit(svm, SVM_EXIT_INIT); 1148 return 0; 1149 } 1150 1151 if (vcpu->arch.exception.pending) { 1152 /* 1153 * Only a pending nested run can block a pending exception. 1154 * Otherwise an injected NMI/interrupt should either be 1155 * lost or delivered to the nested hypervisor in the EXITINTINFO 1156 * vmcb field, while delivering the pending exception. 1157 */ 1158 if (svm->nested.nested_run_pending) 1159 return -EBUSY; 1160 if (!nested_exit_on_exception(svm)) 1161 return 0; 1162 nested_svm_inject_exception_vmexit(svm); 1163 return 0; 1164 } 1165 1166 if (vcpu->arch.smi_pending && !svm_smi_blocked(vcpu)) { 1167 if (block_nested_events) 1168 return -EBUSY; 1169 if (!nested_exit_on_smi(svm)) 1170 return 0; 1171 nested_svm_simple_vmexit(svm, SVM_EXIT_SMI); 1172 return 0; 1173 } 1174 1175 if (vcpu->arch.nmi_pending && !svm_nmi_blocked(vcpu)) { 1176 if (block_nested_events) 1177 return -EBUSY; 1178 if (!nested_exit_on_nmi(svm)) 1179 return 0; 1180 nested_svm_simple_vmexit(svm, SVM_EXIT_NMI); 1181 return 0; 1182 } 1183 1184 if (kvm_cpu_has_interrupt(vcpu) && !svm_interrupt_blocked(vcpu)) { 1185 if (block_nested_events) 1186 return -EBUSY; 1187 if (!nested_exit_on_intr(svm)) 1188 return 0; 1189 trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip); 1190 nested_svm_simple_vmexit(svm, SVM_EXIT_INTR); 1191 return 0; 1192 } 1193 1194 return 0; 1195 } 1196 1197 int nested_svm_exit_special(struct vcpu_svm *svm) 1198 { 1199 u32 exit_code = svm->vmcb->control.exit_code; 1200 1201 switch (exit_code) { 1202 case SVM_EXIT_INTR: 1203 case SVM_EXIT_NMI: 1204 case SVM_EXIT_NPF: 1205 return NESTED_EXIT_HOST; 1206 case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: { 1207 u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE); 1208 1209 if (svm->vmcb01.ptr->control.intercepts[INTERCEPT_EXCEPTION] & 1210 excp_bits) 1211 return NESTED_EXIT_HOST; 1212 else if (exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR && 1213 svm->vcpu.arch.apf.host_apf_flags) 1214 /* Trap async PF even if not shadowing */ 1215 return NESTED_EXIT_HOST; 1216 break; 1217 } 1218 default: 1219 break; 1220 } 1221 1222 return NESTED_EXIT_CONTINUE; 1223 } 1224 1225 static int svm_get_nested_state(struct kvm_vcpu *vcpu, 1226 struct kvm_nested_state __user *user_kvm_nested_state, 1227 u32 user_data_size) 1228 { 1229 struct vcpu_svm *svm; 1230 struct kvm_nested_state kvm_state = { 1231 .flags = 0, 1232 .format = KVM_STATE_NESTED_FORMAT_SVM, 1233 .size = sizeof(kvm_state), 1234 }; 1235 struct vmcb __user *user_vmcb = (struct vmcb __user *) 1236 &user_kvm_nested_state->data.svm[0]; 1237 1238 if (!vcpu) 1239 return kvm_state.size + KVM_STATE_NESTED_SVM_VMCB_SIZE; 1240 1241 svm = to_svm(vcpu); 1242 1243 if (user_data_size < kvm_state.size) 1244 goto out; 1245 1246 /* First fill in the header and copy it out. */ 1247 if (is_guest_mode(vcpu)) { 1248 kvm_state.hdr.svm.vmcb_pa = svm->nested.vmcb12_gpa; 1249 kvm_state.size += KVM_STATE_NESTED_SVM_VMCB_SIZE; 1250 kvm_state.flags |= KVM_STATE_NESTED_GUEST_MODE; 1251 1252 if (svm->nested.nested_run_pending) 1253 kvm_state.flags |= KVM_STATE_NESTED_RUN_PENDING; 1254 } 1255 1256 if (gif_set(svm)) 1257 kvm_state.flags |= KVM_STATE_NESTED_GIF_SET; 1258 1259 if (copy_to_user(user_kvm_nested_state, &kvm_state, sizeof(kvm_state))) 1260 return -EFAULT; 1261 1262 if (!is_guest_mode(vcpu)) 1263 goto out; 1264 1265 /* 1266 * Copy over the full size of the VMCB rather than just the size 1267 * of the structs. 1268 */ 1269 if (clear_user(user_vmcb, KVM_STATE_NESTED_SVM_VMCB_SIZE)) 1270 return -EFAULT; 1271 if (copy_to_user(&user_vmcb->control, &svm->nested.ctl, 1272 sizeof(user_vmcb->control))) 1273 return -EFAULT; 1274 if (copy_to_user(&user_vmcb->save, &svm->vmcb01.ptr->save, 1275 sizeof(user_vmcb->save))) 1276 return -EFAULT; 1277 out: 1278 return kvm_state.size; 1279 } 1280 1281 static int svm_set_nested_state(struct kvm_vcpu *vcpu, 1282 struct kvm_nested_state __user *user_kvm_nested_state, 1283 struct kvm_nested_state *kvm_state) 1284 { 1285 struct vcpu_svm *svm = to_svm(vcpu); 1286 struct vmcb __user *user_vmcb = (struct vmcb __user *) 1287 &user_kvm_nested_state->data.svm[0]; 1288 struct vmcb_control_area *ctl; 1289 struct vmcb_save_area *save; 1290 unsigned long cr0; 1291 int ret; 1292 1293 BUILD_BUG_ON(sizeof(struct vmcb_control_area) + sizeof(struct vmcb_save_area) > 1294 KVM_STATE_NESTED_SVM_VMCB_SIZE); 1295 1296 if (kvm_state->format != KVM_STATE_NESTED_FORMAT_SVM) 1297 return -EINVAL; 1298 1299 if (kvm_state->flags & ~(KVM_STATE_NESTED_GUEST_MODE | 1300 KVM_STATE_NESTED_RUN_PENDING | 1301 KVM_STATE_NESTED_GIF_SET)) 1302 return -EINVAL; 1303 1304 /* 1305 * If in guest mode, vcpu->arch.efer actually refers to the L2 guest's 1306 * EFER.SVME, but EFER.SVME still has to be 1 for VMRUN to succeed. 1307 */ 1308 if (!(vcpu->arch.efer & EFER_SVME)) { 1309 /* GIF=1 and no guest mode are required if SVME=0. */ 1310 if (kvm_state->flags != KVM_STATE_NESTED_GIF_SET) 1311 return -EINVAL; 1312 } 1313 1314 /* SMM temporarily disables SVM, so we cannot be in guest mode. */ 1315 if (is_smm(vcpu) && (kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE)) 1316 return -EINVAL; 1317 1318 if (!(kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE)) { 1319 svm_leave_nested(svm); 1320 svm_set_gif(svm, !!(kvm_state->flags & KVM_STATE_NESTED_GIF_SET)); 1321 return 0; 1322 } 1323 1324 if (!page_address_valid(vcpu, kvm_state->hdr.svm.vmcb_pa)) 1325 return -EINVAL; 1326 if (kvm_state->size < sizeof(*kvm_state) + KVM_STATE_NESTED_SVM_VMCB_SIZE) 1327 return -EINVAL; 1328 1329 ret = -ENOMEM; 1330 ctl = kzalloc(sizeof(*ctl), GFP_KERNEL_ACCOUNT); 1331 save = kzalloc(sizeof(*save), GFP_KERNEL_ACCOUNT); 1332 if (!ctl || !save) 1333 goto out_free; 1334 1335 ret = -EFAULT; 1336 if (copy_from_user(ctl, &user_vmcb->control, sizeof(*ctl))) 1337 goto out_free; 1338 if (copy_from_user(save, &user_vmcb->save, sizeof(*save))) 1339 goto out_free; 1340 1341 ret = -EINVAL; 1342 if (!nested_vmcb_check_controls(vcpu, ctl)) 1343 goto out_free; 1344 1345 /* 1346 * Processor state contains L2 state. Check that it is 1347 * valid for guest mode (see nested_vmcb_check_save). 1348 */ 1349 cr0 = kvm_read_cr0(vcpu); 1350 if (((cr0 & X86_CR0_CD) == 0) && (cr0 & X86_CR0_NW)) 1351 goto out_free; 1352 1353 /* 1354 * Validate host state saved from before VMRUN (see 1355 * nested_svm_check_permissions). 1356 */ 1357 if (!(save->cr0 & X86_CR0_PG) || 1358 !(save->cr0 & X86_CR0_PE) || 1359 (save->rflags & X86_EFLAGS_VM) || 1360 !nested_vmcb_valid_sregs(vcpu, save)) 1361 goto out_free; 1362 1363 /* 1364 * While the nested guest CR3 is already checked and set by 1365 * KVM_SET_SREGS, it was set when nested state was yet loaded, 1366 * thus MMU might not be initialized correctly. 1367 * Set it again to fix this. 1368 */ 1369 1370 ret = nested_svm_load_cr3(&svm->vcpu, vcpu->arch.cr3, 1371 nested_npt_enabled(svm), false); 1372 if (WARN_ON_ONCE(ret)) 1373 goto out_free; 1374 1375 1376 /* 1377 * All checks done, we can enter guest mode. Userspace provides 1378 * vmcb12.control, which will be combined with L1 and stored into 1379 * vmcb02, and the L1 save state which we store in vmcb01. 1380 * L2 registers if needed are moved from the current VMCB to VMCB02. 1381 */ 1382 1383 if (is_guest_mode(vcpu)) 1384 svm_leave_nested(svm); 1385 else 1386 svm->nested.vmcb02.ptr->save = svm->vmcb01.ptr->save; 1387 1388 svm_set_gif(svm, !!(kvm_state->flags & KVM_STATE_NESTED_GIF_SET)); 1389 1390 svm->nested.nested_run_pending = 1391 !!(kvm_state->flags & KVM_STATE_NESTED_RUN_PENDING); 1392 1393 svm->nested.vmcb12_gpa = kvm_state->hdr.svm.vmcb_pa; 1394 1395 svm_copy_vmrun_state(&svm->vmcb01.ptr->save, save); 1396 nested_load_control_from_vmcb12(svm, ctl); 1397 1398 svm_switch_vmcb(svm, &svm->nested.vmcb02); 1399 nested_vmcb02_prepare_control(svm); 1400 kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu); 1401 ret = 0; 1402 out_free: 1403 kfree(save); 1404 kfree(ctl); 1405 1406 return ret; 1407 } 1408 1409 static bool svm_get_nested_state_pages(struct kvm_vcpu *vcpu) 1410 { 1411 struct vcpu_svm *svm = to_svm(vcpu); 1412 1413 if (WARN_ON(!is_guest_mode(vcpu))) 1414 return true; 1415 1416 if (!vcpu->arch.pdptrs_from_userspace && 1417 !nested_npt_enabled(svm) && is_pae_paging(vcpu)) 1418 /* 1419 * Reload the guest's PDPTRs since after a migration 1420 * the guest CR3 might be restored prior to setting the nested 1421 * state which can lead to a load of wrong PDPTRs. 1422 */ 1423 if (CC(!load_pdptrs(vcpu, vcpu->arch.walk_mmu, vcpu->arch.cr3))) 1424 return false; 1425 1426 if (!nested_svm_vmrun_msrpm(svm)) { 1427 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 1428 vcpu->run->internal.suberror = 1429 KVM_INTERNAL_ERROR_EMULATION; 1430 vcpu->run->internal.ndata = 0; 1431 return false; 1432 } 1433 1434 return true; 1435 } 1436 1437 struct kvm_x86_nested_ops svm_nested_ops = { 1438 .check_events = svm_check_nested_events, 1439 .triple_fault = nested_svm_triple_fault, 1440 .get_nested_state_pages = svm_get_nested_state_pages, 1441 .get_state = svm_get_nested_state, 1442 .set_state = svm_set_nested_state, 1443 }; 1444