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, bool from_vmrun) 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), from_vmrun); 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 if (!from_vmrun) 620 kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu); 621 622 svm_set_gif(svm, true); 623 624 return 0; 625 } 626 627 int nested_svm_vmrun(struct kvm_vcpu *vcpu) 628 { 629 struct vcpu_svm *svm = to_svm(vcpu); 630 int ret; 631 struct vmcb *vmcb12; 632 struct kvm_host_map map; 633 u64 vmcb12_gpa; 634 635 if (!svm->nested.hsave_msr) { 636 kvm_inject_gp(vcpu, 0); 637 return 1; 638 } 639 640 if (is_smm(vcpu)) { 641 kvm_queue_exception(vcpu, UD_VECTOR); 642 return 1; 643 } 644 645 vmcb12_gpa = svm->vmcb->save.rax; 646 ret = kvm_vcpu_map(vcpu, gpa_to_gfn(vmcb12_gpa), &map); 647 if (ret == -EINVAL) { 648 kvm_inject_gp(vcpu, 0); 649 return 1; 650 } else if (ret) { 651 return kvm_skip_emulated_instruction(vcpu); 652 } 653 654 ret = kvm_skip_emulated_instruction(vcpu); 655 656 vmcb12 = map.hva; 657 658 if (WARN_ON_ONCE(!svm->nested.initialized)) 659 return -EINVAL; 660 661 nested_load_control_from_vmcb12(svm, &vmcb12->control); 662 663 if (!nested_vmcb_valid_sregs(vcpu, &vmcb12->save) || 664 !nested_vmcb_check_controls(vcpu, &svm->nested.ctl)) { 665 vmcb12->control.exit_code = SVM_EXIT_ERR; 666 vmcb12->control.exit_code_hi = 0; 667 vmcb12->control.exit_info_1 = 0; 668 vmcb12->control.exit_info_2 = 0; 669 goto out; 670 } 671 672 /* 673 * Since vmcb01 is not in use, we can use it to store some of the L1 674 * state. 675 */ 676 svm->vmcb01.ptr->save.efer = vcpu->arch.efer; 677 svm->vmcb01.ptr->save.cr0 = kvm_read_cr0(vcpu); 678 svm->vmcb01.ptr->save.cr4 = vcpu->arch.cr4; 679 svm->vmcb01.ptr->save.rflags = kvm_get_rflags(vcpu); 680 svm->vmcb01.ptr->save.rip = kvm_rip_read(vcpu); 681 682 if (!npt_enabled) 683 svm->vmcb01.ptr->save.cr3 = kvm_read_cr3(vcpu); 684 685 svm->nested.nested_run_pending = 1; 686 687 if (enter_svm_guest_mode(vcpu, vmcb12_gpa, vmcb12, true)) 688 goto out_exit_err; 689 690 if (nested_svm_vmrun_msrpm(svm)) 691 goto out; 692 693 out_exit_err: 694 svm->nested.nested_run_pending = 0; 695 696 svm->vmcb->control.exit_code = SVM_EXIT_ERR; 697 svm->vmcb->control.exit_code_hi = 0; 698 svm->vmcb->control.exit_info_1 = 0; 699 svm->vmcb->control.exit_info_2 = 0; 700 701 nested_svm_vmexit(svm); 702 703 out: 704 kvm_vcpu_unmap(vcpu, &map, true); 705 706 return ret; 707 } 708 709 /* Copy state save area fields which are handled by VMRUN */ 710 void svm_copy_vmrun_state(struct vmcb_save_area *to_save, 711 struct vmcb_save_area *from_save) 712 { 713 to_save->es = from_save->es; 714 to_save->cs = from_save->cs; 715 to_save->ss = from_save->ss; 716 to_save->ds = from_save->ds; 717 to_save->gdtr = from_save->gdtr; 718 to_save->idtr = from_save->idtr; 719 to_save->rflags = from_save->rflags | X86_EFLAGS_FIXED; 720 to_save->efer = from_save->efer; 721 to_save->cr0 = from_save->cr0; 722 to_save->cr3 = from_save->cr3; 723 to_save->cr4 = from_save->cr4; 724 to_save->rax = from_save->rax; 725 to_save->rsp = from_save->rsp; 726 to_save->rip = from_save->rip; 727 to_save->cpl = 0; 728 } 729 730 void svm_copy_vmloadsave_state(struct vmcb *to_vmcb, struct vmcb *from_vmcb) 731 { 732 to_vmcb->save.fs = from_vmcb->save.fs; 733 to_vmcb->save.gs = from_vmcb->save.gs; 734 to_vmcb->save.tr = from_vmcb->save.tr; 735 to_vmcb->save.ldtr = from_vmcb->save.ldtr; 736 to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base; 737 to_vmcb->save.star = from_vmcb->save.star; 738 to_vmcb->save.lstar = from_vmcb->save.lstar; 739 to_vmcb->save.cstar = from_vmcb->save.cstar; 740 to_vmcb->save.sfmask = from_vmcb->save.sfmask; 741 to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs; 742 to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp; 743 to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip; 744 } 745 746 int nested_svm_vmexit(struct vcpu_svm *svm) 747 { 748 struct kvm_vcpu *vcpu = &svm->vcpu; 749 struct vmcb *vmcb12; 750 struct vmcb *vmcb = svm->vmcb; 751 struct kvm_host_map map; 752 int rc; 753 754 /* Triple faults in L2 should never escape. */ 755 WARN_ON_ONCE(kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)); 756 757 rc = kvm_vcpu_map(vcpu, gpa_to_gfn(svm->nested.vmcb12_gpa), &map); 758 if (rc) { 759 if (rc == -EINVAL) 760 kvm_inject_gp(vcpu, 0); 761 return 1; 762 } 763 764 vmcb12 = map.hva; 765 766 /* Exit Guest-Mode */ 767 leave_guest_mode(vcpu); 768 svm->nested.vmcb12_gpa = 0; 769 WARN_ON_ONCE(svm->nested.nested_run_pending); 770 771 kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu); 772 773 /* in case we halted in L2 */ 774 svm->vcpu.arch.mp_state = KVM_MP_STATE_RUNNABLE; 775 776 /* Give the current vmcb to the guest */ 777 778 vmcb12->save.es = vmcb->save.es; 779 vmcb12->save.cs = vmcb->save.cs; 780 vmcb12->save.ss = vmcb->save.ss; 781 vmcb12->save.ds = vmcb->save.ds; 782 vmcb12->save.gdtr = vmcb->save.gdtr; 783 vmcb12->save.idtr = vmcb->save.idtr; 784 vmcb12->save.efer = svm->vcpu.arch.efer; 785 vmcb12->save.cr0 = kvm_read_cr0(vcpu); 786 vmcb12->save.cr3 = kvm_read_cr3(vcpu); 787 vmcb12->save.cr2 = vmcb->save.cr2; 788 vmcb12->save.cr4 = svm->vcpu.arch.cr4; 789 vmcb12->save.rflags = kvm_get_rflags(vcpu); 790 vmcb12->save.rip = kvm_rip_read(vcpu); 791 vmcb12->save.rsp = kvm_rsp_read(vcpu); 792 vmcb12->save.rax = kvm_rax_read(vcpu); 793 vmcb12->save.dr7 = vmcb->save.dr7; 794 vmcb12->save.dr6 = svm->vcpu.arch.dr6; 795 vmcb12->save.cpl = vmcb->save.cpl; 796 797 vmcb12->control.int_state = vmcb->control.int_state; 798 vmcb12->control.exit_code = vmcb->control.exit_code; 799 vmcb12->control.exit_code_hi = vmcb->control.exit_code_hi; 800 vmcb12->control.exit_info_1 = vmcb->control.exit_info_1; 801 vmcb12->control.exit_info_2 = vmcb->control.exit_info_2; 802 803 if (vmcb12->control.exit_code != SVM_EXIT_ERR) 804 nested_save_pending_event_to_vmcb12(svm, vmcb12); 805 806 if (svm->nrips_enabled) 807 vmcb12->control.next_rip = vmcb->control.next_rip; 808 809 vmcb12->control.int_ctl = svm->nested.ctl.int_ctl; 810 vmcb12->control.tlb_ctl = svm->nested.ctl.tlb_ctl; 811 vmcb12->control.event_inj = svm->nested.ctl.event_inj; 812 vmcb12->control.event_inj_err = svm->nested.ctl.event_inj_err; 813 814 vmcb12->control.pause_filter_count = 815 svm->vmcb->control.pause_filter_count; 816 vmcb12->control.pause_filter_thresh = 817 svm->vmcb->control.pause_filter_thresh; 818 819 nested_svm_copy_common_state(svm->nested.vmcb02.ptr, svm->vmcb01.ptr); 820 821 svm_switch_vmcb(svm, &svm->vmcb01); 822 823 /* 824 * On vmexit the GIF is set to false and 825 * no event can be injected in L1. 826 */ 827 svm_set_gif(svm, false); 828 svm->vmcb->control.exit_int_info = 0; 829 830 svm->vcpu.arch.tsc_offset = svm->vcpu.arch.l1_tsc_offset; 831 if (svm->vmcb->control.tsc_offset != svm->vcpu.arch.tsc_offset) { 832 svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset; 833 vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS); 834 } 835 836 svm->nested.ctl.nested_cr3 = 0; 837 838 /* 839 * Restore processor state that had been saved in vmcb01 840 */ 841 kvm_set_rflags(vcpu, svm->vmcb->save.rflags); 842 svm_set_efer(vcpu, svm->vmcb->save.efer); 843 svm_set_cr0(vcpu, svm->vmcb->save.cr0 | X86_CR0_PE); 844 svm_set_cr4(vcpu, svm->vmcb->save.cr4); 845 kvm_rax_write(vcpu, svm->vmcb->save.rax); 846 kvm_rsp_write(vcpu, svm->vmcb->save.rsp); 847 kvm_rip_write(vcpu, svm->vmcb->save.rip); 848 849 svm->vcpu.arch.dr7 = DR7_FIXED_1; 850 kvm_update_dr7(&svm->vcpu); 851 852 trace_kvm_nested_vmexit_inject(vmcb12->control.exit_code, 853 vmcb12->control.exit_info_1, 854 vmcb12->control.exit_info_2, 855 vmcb12->control.exit_int_info, 856 vmcb12->control.exit_int_info_err, 857 KVM_ISA_SVM); 858 859 kvm_vcpu_unmap(vcpu, &map, true); 860 861 nested_svm_transition_tlb_flush(vcpu); 862 863 nested_svm_uninit_mmu_context(vcpu); 864 865 rc = nested_svm_load_cr3(vcpu, svm->vmcb->save.cr3, false, true); 866 if (rc) 867 return 1; 868 869 /* 870 * Drop what we picked up for L2 via svm_complete_interrupts() so it 871 * doesn't end up in L1. 872 */ 873 svm->vcpu.arch.nmi_injected = false; 874 kvm_clear_exception_queue(vcpu); 875 kvm_clear_interrupt_queue(vcpu); 876 877 /* 878 * If we are here following the completion of a VMRUN that 879 * is being single-stepped, queue the pending #DB intercept 880 * right now so that it an be accounted for before we execute 881 * L1's next instruction. 882 */ 883 if (unlikely(svm->vmcb->save.rflags & X86_EFLAGS_TF)) 884 kvm_queue_exception(&(svm->vcpu), DB_VECTOR); 885 886 return 0; 887 } 888 889 static void nested_svm_triple_fault(struct kvm_vcpu *vcpu) 890 { 891 nested_svm_simple_vmexit(to_svm(vcpu), SVM_EXIT_SHUTDOWN); 892 } 893 894 int svm_allocate_nested(struct vcpu_svm *svm) 895 { 896 struct page *vmcb02_page; 897 898 if (svm->nested.initialized) 899 return 0; 900 901 vmcb02_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO); 902 if (!vmcb02_page) 903 return -ENOMEM; 904 svm->nested.vmcb02.ptr = page_address(vmcb02_page); 905 svm->nested.vmcb02.pa = __sme_set(page_to_pfn(vmcb02_page) << PAGE_SHIFT); 906 907 svm->nested.msrpm = svm_vcpu_alloc_msrpm(); 908 if (!svm->nested.msrpm) 909 goto err_free_vmcb02; 910 svm_vcpu_init_msrpm(&svm->vcpu, svm->nested.msrpm); 911 912 svm->nested.initialized = true; 913 return 0; 914 915 err_free_vmcb02: 916 __free_page(vmcb02_page); 917 return -ENOMEM; 918 } 919 920 void svm_free_nested(struct vcpu_svm *svm) 921 { 922 if (!svm->nested.initialized) 923 return; 924 925 svm_vcpu_free_msrpm(svm->nested.msrpm); 926 svm->nested.msrpm = NULL; 927 928 __free_page(virt_to_page(svm->nested.vmcb02.ptr)); 929 svm->nested.vmcb02.ptr = NULL; 930 931 /* 932 * When last_vmcb12_gpa matches the current vmcb12 gpa, 933 * some vmcb12 fields are not loaded if they are marked clean 934 * in the vmcb12, since in this case they are up to date already. 935 * 936 * When the vmcb02 is freed, this optimization becomes invalid. 937 */ 938 svm->nested.last_vmcb12_gpa = INVALID_GPA; 939 940 svm->nested.initialized = false; 941 } 942 943 /* 944 * Forcibly leave nested mode in order to be able to reset the VCPU later on. 945 */ 946 void svm_leave_nested(struct vcpu_svm *svm) 947 { 948 struct kvm_vcpu *vcpu = &svm->vcpu; 949 950 if (is_guest_mode(vcpu)) { 951 svm->nested.nested_run_pending = 0; 952 svm->nested.vmcb12_gpa = INVALID_GPA; 953 954 leave_guest_mode(vcpu); 955 956 svm_switch_vmcb(svm, &svm->vmcb01); 957 958 nested_svm_uninit_mmu_context(vcpu); 959 vmcb_mark_all_dirty(svm->vmcb); 960 } 961 962 kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu); 963 } 964 965 static int nested_svm_exit_handled_msr(struct vcpu_svm *svm) 966 { 967 u32 offset, msr, value; 968 int write, mask; 969 970 if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT))) 971 return NESTED_EXIT_HOST; 972 973 msr = svm->vcpu.arch.regs[VCPU_REGS_RCX]; 974 offset = svm_msrpm_offset(msr); 975 write = svm->vmcb->control.exit_info_1 & 1; 976 mask = 1 << ((2 * (msr & 0xf)) + write); 977 978 if (offset == MSR_INVALID) 979 return NESTED_EXIT_DONE; 980 981 /* Offset is in 32 bit units but need in 8 bit units */ 982 offset *= 4; 983 984 if (kvm_vcpu_read_guest(&svm->vcpu, svm->nested.ctl.msrpm_base_pa + offset, &value, 4)) 985 return NESTED_EXIT_DONE; 986 987 return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST; 988 } 989 990 static int nested_svm_intercept_ioio(struct vcpu_svm *svm) 991 { 992 unsigned port, size, iopm_len; 993 u16 val, mask; 994 u8 start_bit; 995 u64 gpa; 996 997 if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_IOIO_PROT))) 998 return NESTED_EXIT_HOST; 999 1000 port = svm->vmcb->control.exit_info_1 >> 16; 1001 size = (svm->vmcb->control.exit_info_1 & SVM_IOIO_SIZE_MASK) >> 1002 SVM_IOIO_SIZE_SHIFT; 1003 gpa = svm->nested.ctl.iopm_base_pa + (port / 8); 1004 start_bit = port % 8; 1005 iopm_len = (start_bit + size > 8) ? 2 : 1; 1006 mask = (0xf >> (4 - size)) << start_bit; 1007 val = 0; 1008 1009 if (kvm_vcpu_read_guest(&svm->vcpu, gpa, &val, iopm_len)) 1010 return NESTED_EXIT_DONE; 1011 1012 return (val & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST; 1013 } 1014 1015 static int nested_svm_intercept(struct vcpu_svm *svm) 1016 { 1017 u32 exit_code = svm->vmcb->control.exit_code; 1018 int vmexit = NESTED_EXIT_HOST; 1019 1020 switch (exit_code) { 1021 case SVM_EXIT_MSR: 1022 vmexit = nested_svm_exit_handled_msr(svm); 1023 break; 1024 case SVM_EXIT_IOIO: 1025 vmexit = nested_svm_intercept_ioio(svm); 1026 break; 1027 case SVM_EXIT_READ_CR0 ... SVM_EXIT_WRITE_CR8: { 1028 if (vmcb_is_intercept(&svm->nested.ctl, exit_code)) 1029 vmexit = NESTED_EXIT_DONE; 1030 break; 1031 } 1032 case SVM_EXIT_READ_DR0 ... SVM_EXIT_WRITE_DR7: { 1033 if (vmcb_is_intercept(&svm->nested.ctl, exit_code)) 1034 vmexit = NESTED_EXIT_DONE; 1035 break; 1036 } 1037 case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: { 1038 /* 1039 * Host-intercepted exceptions have been checked already in 1040 * nested_svm_exit_special. There is nothing to do here, 1041 * the vmexit is injected by svm_check_nested_events. 1042 */ 1043 vmexit = NESTED_EXIT_DONE; 1044 break; 1045 } 1046 case SVM_EXIT_ERR: { 1047 vmexit = NESTED_EXIT_DONE; 1048 break; 1049 } 1050 default: { 1051 if (vmcb_is_intercept(&svm->nested.ctl, exit_code)) 1052 vmexit = NESTED_EXIT_DONE; 1053 } 1054 } 1055 1056 return vmexit; 1057 } 1058 1059 int nested_svm_exit_handled(struct vcpu_svm *svm) 1060 { 1061 int vmexit; 1062 1063 vmexit = nested_svm_intercept(svm); 1064 1065 if (vmexit == NESTED_EXIT_DONE) 1066 nested_svm_vmexit(svm); 1067 1068 return vmexit; 1069 } 1070 1071 int nested_svm_check_permissions(struct kvm_vcpu *vcpu) 1072 { 1073 if (!(vcpu->arch.efer & EFER_SVME) || !is_paging(vcpu)) { 1074 kvm_queue_exception(vcpu, UD_VECTOR); 1075 return 1; 1076 } 1077 1078 if (to_svm(vcpu)->vmcb->save.cpl) { 1079 kvm_inject_gp(vcpu, 0); 1080 return 1; 1081 } 1082 1083 return 0; 1084 } 1085 1086 static bool nested_exit_on_exception(struct vcpu_svm *svm) 1087 { 1088 unsigned int nr = svm->vcpu.arch.exception.nr; 1089 1090 return (svm->nested.ctl.intercepts[INTERCEPT_EXCEPTION] & BIT(nr)); 1091 } 1092 1093 static void nested_svm_inject_exception_vmexit(struct vcpu_svm *svm) 1094 { 1095 unsigned int nr = svm->vcpu.arch.exception.nr; 1096 1097 svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr; 1098 svm->vmcb->control.exit_code_hi = 0; 1099 1100 if (svm->vcpu.arch.exception.has_error_code) 1101 svm->vmcb->control.exit_info_1 = svm->vcpu.arch.exception.error_code; 1102 1103 /* 1104 * EXITINFO2 is undefined for all exception intercepts other 1105 * than #PF. 1106 */ 1107 if (nr == PF_VECTOR) { 1108 if (svm->vcpu.arch.exception.nested_apf) 1109 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.apf.nested_apf_token; 1110 else if (svm->vcpu.arch.exception.has_payload) 1111 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.exception.payload; 1112 else 1113 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2; 1114 } else if (nr == DB_VECTOR) { 1115 /* See inject_pending_event. */ 1116 kvm_deliver_exception_payload(&svm->vcpu); 1117 if (svm->vcpu.arch.dr7 & DR7_GD) { 1118 svm->vcpu.arch.dr7 &= ~DR7_GD; 1119 kvm_update_dr7(&svm->vcpu); 1120 } 1121 } else 1122 WARN_ON(svm->vcpu.arch.exception.has_payload); 1123 1124 nested_svm_vmexit(svm); 1125 } 1126 1127 static inline bool nested_exit_on_init(struct vcpu_svm *svm) 1128 { 1129 return vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_INIT); 1130 } 1131 1132 static int svm_check_nested_events(struct kvm_vcpu *vcpu) 1133 { 1134 struct vcpu_svm *svm = to_svm(vcpu); 1135 bool block_nested_events = 1136 kvm_event_needs_reinjection(vcpu) || svm->nested.nested_run_pending; 1137 struct kvm_lapic *apic = vcpu->arch.apic; 1138 1139 if (lapic_in_kernel(vcpu) && 1140 test_bit(KVM_APIC_INIT, &apic->pending_events)) { 1141 if (block_nested_events) 1142 return -EBUSY; 1143 if (!nested_exit_on_init(svm)) 1144 return 0; 1145 nested_svm_simple_vmexit(svm, SVM_EXIT_INIT); 1146 return 0; 1147 } 1148 1149 if (vcpu->arch.exception.pending) { 1150 /* 1151 * Only a pending nested run can block a pending exception. 1152 * Otherwise an injected NMI/interrupt should either be 1153 * lost or delivered to the nested hypervisor in the EXITINTINFO 1154 * vmcb field, while delivering the pending exception. 1155 */ 1156 if (svm->nested.nested_run_pending) 1157 return -EBUSY; 1158 if (!nested_exit_on_exception(svm)) 1159 return 0; 1160 nested_svm_inject_exception_vmexit(svm); 1161 return 0; 1162 } 1163 1164 if (vcpu->arch.smi_pending && !svm_smi_blocked(vcpu)) { 1165 if (block_nested_events) 1166 return -EBUSY; 1167 if (!nested_exit_on_smi(svm)) 1168 return 0; 1169 nested_svm_simple_vmexit(svm, SVM_EXIT_SMI); 1170 return 0; 1171 } 1172 1173 if (vcpu->arch.nmi_pending && !svm_nmi_blocked(vcpu)) { 1174 if (block_nested_events) 1175 return -EBUSY; 1176 if (!nested_exit_on_nmi(svm)) 1177 return 0; 1178 nested_svm_simple_vmexit(svm, SVM_EXIT_NMI); 1179 return 0; 1180 } 1181 1182 if (kvm_cpu_has_interrupt(vcpu) && !svm_interrupt_blocked(vcpu)) { 1183 if (block_nested_events) 1184 return -EBUSY; 1185 if (!nested_exit_on_intr(svm)) 1186 return 0; 1187 trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip); 1188 nested_svm_simple_vmexit(svm, SVM_EXIT_INTR); 1189 return 0; 1190 } 1191 1192 return 0; 1193 } 1194 1195 int nested_svm_exit_special(struct vcpu_svm *svm) 1196 { 1197 u32 exit_code = svm->vmcb->control.exit_code; 1198 1199 switch (exit_code) { 1200 case SVM_EXIT_INTR: 1201 case SVM_EXIT_NMI: 1202 case SVM_EXIT_NPF: 1203 return NESTED_EXIT_HOST; 1204 case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: { 1205 u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE); 1206 1207 if (svm->vmcb01.ptr->control.intercepts[INTERCEPT_EXCEPTION] & 1208 excp_bits) 1209 return NESTED_EXIT_HOST; 1210 else if (exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR && 1211 svm->vcpu.arch.apf.host_apf_flags) 1212 /* Trap async PF even if not shadowing */ 1213 return NESTED_EXIT_HOST; 1214 break; 1215 } 1216 default: 1217 break; 1218 } 1219 1220 return NESTED_EXIT_CONTINUE; 1221 } 1222 1223 static int svm_get_nested_state(struct kvm_vcpu *vcpu, 1224 struct kvm_nested_state __user *user_kvm_nested_state, 1225 u32 user_data_size) 1226 { 1227 struct vcpu_svm *svm; 1228 struct kvm_nested_state kvm_state = { 1229 .flags = 0, 1230 .format = KVM_STATE_NESTED_FORMAT_SVM, 1231 .size = sizeof(kvm_state), 1232 }; 1233 struct vmcb __user *user_vmcb = (struct vmcb __user *) 1234 &user_kvm_nested_state->data.svm[0]; 1235 1236 if (!vcpu) 1237 return kvm_state.size + KVM_STATE_NESTED_SVM_VMCB_SIZE; 1238 1239 svm = to_svm(vcpu); 1240 1241 if (user_data_size < kvm_state.size) 1242 goto out; 1243 1244 /* First fill in the header and copy it out. */ 1245 if (is_guest_mode(vcpu)) { 1246 kvm_state.hdr.svm.vmcb_pa = svm->nested.vmcb12_gpa; 1247 kvm_state.size += KVM_STATE_NESTED_SVM_VMCB_SIZE; 1248 kvm_state.flags |= KVM_STATE_NESTED_GUEST_MODE; 1249 1250 if (svm->nested.nested_run_pending) 1251 kvm_state.flags |= KVM_STATE_NESTED_RUN_PENDING; 1252 } 1253 1254 if (gif_set(svm)) 1255 kvm_state.flags |= KVM_STATE_NESTED_GIF_SET; 1256 1257 if (copy_to_user(user_kvm_nested_state, &kvm_state, sizeof(kvm_state))) 1258 return -EFAULT; 1259 1260 if (!is_guest_mode(vcpu)) 1261 goto out; 1262 1263 /* 1264 * Copy over the full size of the VMCB rather than just the size 1265 * of the structs. 1266 */ 1267 if (clear_user(user_vmcb, KVM_STATE_NESTED_SVM_VMCB_SIZE)) 1268 return -EFAULT; 1269 if (copy_to_user(&user_vmcb->control, &svm->nested.ctl, 1270 sizeof(user_vmcb->control))) 1271 return -EFAULT; 1272 if (copy_to_user(&user_vmcb->save, &svm->vmcb01.ptr->save, 1273 sizeof(user_vmcb->save))) 1274 return -EFAULT; 1275 out: 1276 return kvm_state.size; 1277 } 1278 1279 static int svm_set_nested_state(struct kvm_vcpu *vcpu, 1280 struct kvm_nested_state __user *user_kvm_nested_state, 1281 struct kvm_nested_state *kvm_state) 1282 { 1283 struct vcpu_svm *svm = to_svm(vcpu); 1284 struct vmcb __user *user_vmcb = (struct vmcb __user *) 1285 &user_kvm_nested_state->data.svm[0]; 1286 struct vmcb_control_area *ctl; 1287 struct vmcb_save_area *save; 1288 unsigned long cr0; 1289 int ret; 1290 1291 BUILD_BUG_ON(sizeof(struct vmcb_control_area) + sizeof(struct vmcb_save_area) > 1292 KVM_STATE_NESTED_SVM_VMCB_SIZE); 1293 1294 if (kvm_state->format != KVM_STATE_NESTED_FORMAT_SVM) 1295 return -EINVAL; 1296 1297 if (kvm_state->flags & ~(KVM_STATE_NESTED_GUEST_MODE | 1298 KVM_STATE_NESTED_RUN_PENDING | 1299 KVM_STATE_NESTED_GIF_SET)) 1300 return -EINVAL; 1301 1302 /* 1303 * If in guest mode, vcpu->arch.efer actually refers to the L2 guest's 1304 * EFER.SVME, but EFER.SVME still has to be 1 for VMRUN to succeed. 1305 */ 1306 if (!(vcpu->arch.efer & EFER_SVME)) { 1307 /* GIF=1 and no guest mode are required if SVME=0. */ 1308 if (kvm_state->flags != KVM_STATE_NESTED_GIF_SET) 1309 return -EINVAL; 1310 } 1311 1312 /* SMM temporarily disables SVM, so we cannot be in guest mode. */ 1313 if (is_smm(vcpu) && (kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE)) 1314 return -EINVAL; 1315 1316 if (!(kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE)) { 1317 svm_leave_nested(svm); 1318 svm_set_gif(svm, !!(kvm_state->flags & KVM_STATE_NESTED_GIF_SET)); 1319 return 0; 1320 } 1321 1322 if (!page_address_valid(vcpu, kvm_state->hdr.svm.vmcb_pa)) 1323 return -EINVAL; 1324 if (kvm_state->size < sizeof(*kvm_state) + KVM_STATE_NESTED_SVM_VMCB_SIZE) 1325 return -EINVAL; 1326 1327 ret = -ENOMEM; 1328 ctl = kzalloc(sizeof(*ctl), GFP_KERNEL_ACCOUNT); 1329 save = kzalloc(sizeof(*save), GFP_KERNEL_ACCOUNT); 1330 if (!ctl || !save) 1331 goto out_free; 1332 1333 ret = -EFAULT; 1334 if (copy_from_user(ctl, &user_vmcb->control, sizeof(*ctl))) 1335 goto out_free; 1336 if (copy_from_user(save, &user_vmcb->save, sizeof(*save))) 1337 goto out_free; 1338 1339 ret = -EINVAL; 1340 if (!nested_vmcb_check_controls(vcpu, ctl)) 1341 goto out_free; 1342 1343 /* 1344 * Processor state contains L2 state. Check that it is 1345 * valid for guest mode (see nested_vmcb_check_save). 1346 */ 1347 cr0 = kvm_read_cr0(vcpu); 1348 if (((cr0 & X86_CR0_CD) == 0) && (cr0 & X86_CR0_NW)) 1349 goto out_free; 1350 1351 /* 1352 * Validate host state saved from before VMRUN (see 1353 * nested_svm_check_permissions). 1354 */ 1355 if (!(save->cr0 & X86_CR0_PG) || 1356 !(save->cr0 & X86_CR0_PE) || 1357 (save->rflags & X86_EFLAGS_VM) || 1358 !nested_vmcb_valid_sregs(vcpu, save)) 1359 goto out_free; 1360 1361 /* 1362 * While the nested guest CR3 is already checked and set by 1363 * KVM_SET_SREGS, it was set when nested state was yet loaded, 1364 * thus MMU might not be initialized correctly. 1365 * Set it again to fix this. 1366 */ 1367 1368 ret = nested_svm_load_cr3(&svm->vcpu, vcpu->arch.cr3, 1369 nested_npt_enabled(svm), false); 1370 if (WARN_ON_ONCE(ret)) 1371 goto out_free; 1372 1373 1374 /* 1375 * All checks done, we can enter guest mode. Userspace provides 1376 * vmcb12.control, which will be combined with L1 and stored into 1377 * vmcb02, and the L1 save state which we store in vmcb01. 1378 * L2 registers if needed are moved from the current VMCB to VMCB02. 1379 */ 1380 1381 if (is_guest_mode(vcpu)) 1382 svm_leave_nested(svm); 1383 else 1384 svm->nested.vmcb02.ptr->save = svm->vmcb01.ptr->save; 1385 1386 svm_set_gif(svm, !!(kvm_state->flags & KVM_STATE_NESTED_GIF_SET)); 1387 1388 svm->nested.nested_run_pending = 1389 !!(kvm_state->flags & KVM_STATE_NESTED_RUN_PENDING); 1390 1391 svm->nested.vmcb12_gpa = kvm_state->hdr.svm.vmcb_pa; 1392 1393 svm_copy_vmrun_state(&svm->vmcb01.ptr->save, save); 1394 nested_load_control_from_vmcb12(svm, ctl); 1395 1396 svm_switch_vmcb(svm, &svm->nested.vmcb02); 1397 nested_vmcb02_prepare_control(svm); 1398 kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu); 1399 ret = 0; 1400 out_free: 1401 kfree(save); 1402 kfree(ctl); 1403 1404 return ret; 1405 } 1406 1407 static bool svm_get_nested_state_pages(struct kvm_vcpu *vcpu) 1408 { 1409 struct vcpu_svm *svm = to_svm(vcpu); 1410 1411 if (WARN_ON(!is_guest_mode(vcpu))) 1412 return true; 1413 1414 if (!vcpu->arch.pdptrs_from_userspace && 1415 !nested_npt_enabled(svm) && is_pae_paging(vcpu)) 1416 /* 1417 * Reload the guest's PDPTRs since after a migration 1418 * the guest CR3 might be restored prior to setting the nested 1419 * state which can lead to a load of wrong PDPTRs. 1420 */ 1421 if (CC(!load_pdptrs(vcpu, vcpu->arch.walk_mmu, vcpu->arch.cr3))) 1422 return false; 1423 1424 if (!nested_svm_vmrun_msrpm(svm)) { 1425 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 1426 vcpu->run->internal.suberror = 1427 KVM_INTERNAL_ERROR_EMULATION; 1428 vcpu->run->internal.ndata = 0; 1429 return false; 1430 } 1431 1432 return true; 1433 } 1434 1435 struct kvm_x86_nested_ops svm_nested_ops = { 1436 .check_events = svm_check_nested_events, 1437 .triple_fault = nested_svm_triple_fault, 1438 .get_nested_state_pages = svm_get_nested_state_pages, 1439 .get_state = svm_get_nested_state, 1440 .set_state = svm_set_nested_state, 1441 }; 1442