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