1145 lines
32 KiB
C
1145 lines
32 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Kernel-based Virtual Machine driver for Linux
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*
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* AMD SVM support
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*
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* Copyright (C) 2006 Qumranet, Inc.
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* Copyright 2010 Red Hat, Inc. and/or its affiliates.
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*
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* Authors:
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* Yaniv Kamay <yaniv@qumranet.com>
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* Avi Kivity <avi@qumranet.com>
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*/
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#define pr_fmt(fmt) "SVM: " fmt
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#include <linux/kvm_types.h>
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#include <linux/kvm_host.h>
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#include <linux/kernel.h>
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#include <asm/msr-index.h>
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#include <asm/debugreg.h>
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#include "kvm_emulate.h"
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#include "trace.h"
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#include "mmu.h"
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#include "x86.h"
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#include "cpuid.h"
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#include "lapic.h"
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#include "svm.h"
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static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu,
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struct x86_exception *fault)
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{
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struct vcpu_svm *svm = to_svm(vcpu);
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if (svm->vmcb->control.exit_code != SVM_EXIT_NPF) {
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/*
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* TODO: track the cause of the nested page fault, and
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* correctly fill in the high bits of exit_info_1.
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*/
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svm->vmcb->control.exit_code = SVM_EXIT_NPF;
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svm->vmcb->control.exit_code_hi = 0;
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svm->vmcb->control.exit_info_1 = (1ULL << 32);
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svm->vmcb->control.exit_info_2 = fault->address;
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}
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svm->vmcb->control.exit_info_1 &= ~0xffffffffULL;
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svm->vmcb->control.exit_info_1 |= fault->error_code;
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nested_svm_vmexit(svm);
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}
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static u64 nested_svm_get_tdp_pdptr(struct kvm_vcpu *vcpu, int index)
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{
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struct vcpu_svm *svm = to_svm(vcpu);
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u64 cr3 = svm->nested.ctl.nested_cr3;
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u64 pdpte;
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int ret;
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ret = kvm_vcpu_read_guest_page(vcpu, gpa_to_gfn(__sme_clr(cr3)), &pdpte,
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offset_in_page(cr3) + index * 8, 8);
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if (ret)
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return 0;
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return pdpte;
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}
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static unsigned long nested_svm_get_tdp_cr3(struct kvm_vcpu *vcpu)
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{
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struct vcpu_svm *svm = to_svm(vcpu);
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return svm->nested.ctl.nested_cr3;
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}
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static void nested_svm_init_mmu_context(struct kvm_vcpu *vcpu)
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{
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struct vcpu_svm *svm = to_svm(vcpu);
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struct vmcb *hsave = svm->nested.hsave;
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WARN_ON(mmu_is_nested(vcpu));
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vcpu->arch.mmu = &vcpu->arch.guest_mmu;
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kvm_init_shadow_npt_mmu(vcpu, X86_CR0_PG, hsave->save.cr4, hsave->save.efer,
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svm->nested.ctl.nested_cr3);
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vcpu->arch.mmu->get_guest_pgd = nested_svm_get_tdp_cr3;
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vcpu->arch.mmu->get_pdptr = nested_svm_get_tdp_pdptr;
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vcpu->arch.mmu->inject_page_fault = nested_svm_inject_npf_exit;
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reset_shadow_zero_bits_mask(vcpu, vcpu->arch.mmu);
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vcpu->arch.walk_mmu = &vcpu->arch.nested_mmu;
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}
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static void nested_svm_uninit_mmu_context(struct kvm_vcpu *vcpu)
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{
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vcpu->arch.mmu = &vcpu->arch.root_mmu;
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vcpu->arch.walk_mmu = &vcpu->arch.root_mmu;
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}
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void recalc_intercepts(struct vcpu_svm *svm)
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{
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struct vmcb_control_area *c, *h, *g;
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vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
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if (!is_guest_mode(&svm->vcpu))
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return;
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c = &svm->vmcb->control;
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h = &svm->nested.hsave->control;
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g = &svm->nested.ctl;
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svm->nested.host_intercept_exceptions = h->intercept_exceptions;
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c->intercept_cr = h->intercept_cr;
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c->intercept_dr = h->intercept_dr;
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c->intercept_exceptions = h->intercept_exceptions;
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c->intercept = h->intercept;
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if (g->int_ctl & V_INTR_MASKING_MASK) {
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/* We only want the cr8 intercept bits of L1 */
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c->intercept_cr &= ~(1U << INTERCEPT_CR8_READ);
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c->intercept_cr &= ~(1U << INTERCEPT_CR8_WRITE);
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/*
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* Once running L2 with HF_VINTR_MASK, EFLAGS.IF does not
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* affect any interrupt we may want to inject; therefore,
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* interrupt window vmexits are irrelevant to L0.
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*/
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c->intercept &= ~(1ULL << INTERCEPT_VINTR);
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}
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/* We don't want to see VMMCALLs from a nested guest */
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c->intercept &= ~(1ULL << INTERCEPT_VMMCALL);
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c->intercept_cr |= g->intercept_cr;
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c->intercept_dr |= g->intercept_dr;
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c->intercept_exceptions |= g->intercept_exceptions;
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c->intercept |= g->intercept;
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}
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static void copy_vmcb_control_area(struct vmcb_control_area *dst,
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struct vmcb_control_area *from)
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{
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dst->intercept_cr = from->intercept_cr;
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dst->intercept_dr = from->intercept_dr;
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dst->intercept_exceptions = from->intercept_exceptions;
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dst->intercept = from->intercept;
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dst->iopm_base_pa = from->iopm_base_pa;
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dst->msrpm_base_pa = from->msrpm_base_pa;
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dst->tsc_offset = from->tsc_offset;
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/* asid not copied, it is handled manually for svm->vmcb. */
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dst->tlb_ctl = from->tlb_ctl;
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dst->int_ctl = from->int_ctl;
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dst->int_vector = from->int_vector;
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dst->int_state = from->int_state;
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dst->exit_code = from->exit_code;
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dst->exit_code_hi = from->exit_code_hi;
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dst->exit_info_1 = from->exit_info_1;
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dst->exit_info_2 = from->exit_info_2;
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dst->exit_int_info = from->exit_int_info;
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dst->exit_int_info_err = from->exit_int_info_err;
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dst->nested_ctl = from->nested_ctl;
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dst->event_inj = from->event_inj;
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dst->event_inj_err = from->event_inj_err;
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dst->nested_cr3 = from->nested_cr3;
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dst->virt_ext = from->virt_ext;
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dst->pause_filter_count = from->pause_filter_count;
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dst->pause_filter_thresh = from->pause_filter_thresh;
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}
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static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
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{
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/*
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* This function merges the msr permission bitmaps of kvm and the
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* nested vmcb. It is optimized in that it only merges the parts where
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* the kvm msr permission bitmap may contain zero bits
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*/
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int i;
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if (!(svm->nested.ctl.intercept & (1ULL << INTERCEPT_MSR_PROT)))
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return true;
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for (i = 0; i < MSRPM_OFFSETS; i++) {
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u32 value, p;
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u64 offset;
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if (msrpm_offsets[i] == 0xffffffff)
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break;
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p = msrpm_offsets[i];
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offset = svm->nested.ctl.msrpm_base_pa + (p * 4);
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if (kvm_vcpu_read_guest(&svm->vcpu, offset, &value, 4))
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return false;
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svm->nested.msrpm[p] = svm->msrpm[p] | value;
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}
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svm->vmcb->control.msrpm_base_pa = __sme_set(__pa(svm->nested.msrpm));
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return true;
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}
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static bool nested_vmcb_check_controls(struct vmcb_control_area *control)
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{
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if ((control->intercept & (1ULL << INTERCEPT_VMRUN)) == 0)
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return false;
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if (control->asid == 0)
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return false;
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if ((control->nested_ctl & SVM_NESTED_CTL_NP_ENABLE) &&
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!npt_enabled)
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return false;
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return true;
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}
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static bool nested_vmcb_checks(struct vcpu_svm *svm, struct vmcb *vmcb)
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{
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bool nested_vmcb_lma;
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if ((vmcb->save.efer & EFER_SVME) == 0)
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return false;
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if (((vmcb->save.cr0 & X86_CR0_CD) == 0) &&
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(vmcb->save.cr0 & X86_CR0_NW))
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return false;
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if (!kvm_dr6_valid(vmcb->save.dr6) || !kvm_dr7_valid(vmcb->save.dr7))
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return false;
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nested_vmcb_lma =
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(vmcb->save.efer & EFER_LME) &&
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(vmcb->save.cr0 & X86_CR0_PG);
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if (!nested_vmcb_lma) {
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if (vmcb->save.cr4 & X86_CR4_PAE) {
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if (vmcb->save.cr3 & MSR_CR3_LEGACY_PAE_RESERVED_MASK)
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return false;
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} else {
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if (vmcb->save.cr3 & MSR_CR3_LEGACY_RESERVED_MASK)
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return false;
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}
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} else {
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if (!(vmcb->save.cr4 & X86_CR4_PAE) ||
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!(vmcb->save.cr0 & X86_CR0_PE) ||
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(vmcb->save.cr3 & MSR_CR3_LONG_RESERVED_MASK))
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return false;
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}
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if (kvm_valid_cr4(&svm->vcpu, vmcb->save.cr4))
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return false;
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return nested_vmcb_check_controls(&vmcb->control);
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}
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static void load_nested_vmcb_control(struct vcpu_svm *svm,
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struct vmcb_control_area *control)
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{
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copy_vmcb_control_area(&svm->nested.ctl, control);
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/* Copy it here because nested_svm_check_controls will check it. */
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svm->nested.ctl.asid = control->asid;
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svm->nested.ctl.msrpm_base_pa &= ~0x0fffULL;
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svm->nested.ctl.iopm_base_pa &= ~0x0fffULL;
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}
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/*
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* Synchronize fields that are written by the processor, so that
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* they can be copied back into the nested_vmcb.
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*/
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void sync_nested_vmcb_control(struct vcpu_svm *svm)
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{
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u32 mask;
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svm->nested.ctl.event_inj = svm->vmcb->control.event_inj;
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svm->nested.ctl.event_inj_err = svm->vmcb->control.event_inj_err;
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/* Only a few fields of int_ctl are written by the processor. */
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mask = V_IRQ_MASK | V_TPR_MASK;
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if (!(svm->nested.ctl.int_ctl & V_INTR_MASKING_MASK) &&
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svm_is_intercept(svm, INTERCEPT_VINTR)) {
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/*
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* In order to request an interrupt window, L0 is usurping
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* svm->vmcb->control.int_ctl and possibly setting V_IRQ
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* even if it was clear in L1's VMCB. Restoring it would be
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* wrong. However, in this case V_IRQ will remain true until
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* interrupt_window_interception calls svm_clear_vintr and
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* restores int_ctl. We can just leave it aside.
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*/
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mask &= ~V_IRQ_MASK;
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}
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svm->nested.ctl.int_ctl &= ~mask;
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svm->nested.ctl.int_ctl |= svm->vmcb->control.int_ctl & mask;
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}
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/*
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* Transfer any event that L0 or L1 wanted to inject into L2 to
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* EXIT_INT_INFO.
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*/
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static void nested_vmcb_save_pending_event(struct vcpu_svm *svm,
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struct vmcb *nested_vmcb)
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{
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struct kvm_vcpu *vcpu = &svm->vcpu;
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u32 exit_int_info = 0;
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unsigned int nr;
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if (vcpu->arch.exception.injected) {
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nr = vcpu->arch.exception.nr;
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exit_int_info = nr | SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_EXEPT;
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if (vcpu->arch.exception.has_error_code) {
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exit_int_info |= SVM_EVTINJ_VALID_ERR;
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nested_vmcb->control.exit_int_info_err =
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vcpu->arch.exception.error_code;
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}
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} else if (vcpu->arch.nmi_injected) {
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exit_int_info = SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_NMI;
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} else if (vcpu->arch.interrupt.injected) {
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nr = vcpu->arch.interrupt.nr;
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exit_int_info = nr | SVM_EVTINJ_VALID;
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if (vcpu->arch.interrupt.soft)
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exit_int_info |= SVM_EVTINJ_TYPE_SOFT;
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else
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exit_int_info |= SVM_EVTINJ_TYPE_INTR;
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}
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nested_vmcb->control.exit_int_info = exit_int_info;
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}
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static inline bool nested_npt_enabled(struct vcpu_svm *svm)
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{
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return svm->nested.ctl.nested_ctl & SVM_NESTED_CTL_NP_ENABLE;
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}
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/*
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* Load guest's/host's cr3 on nested vmentry or vmexit. @nested_npt is true
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* if we are emulating VM-Entry into a guest with NPT enabled.
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*/
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static int nested_svm_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3,
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bool nested_npt)
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{
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if (cr3 & rsvd_bits(cpuid_maxphyaddr(vcpu), 63))
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return -EINVAL;
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if (!nested_npt && is_pae_paging(vcpu) &&
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(cr3 != kvm_read_cr3(vcpu) || pdptrs_changed(vcpu))) {
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if (!load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3))
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return -EINVAL;
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}
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/*
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* TODO: optimize unconditional TLB flush/MMU sync here and in
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* kvm_init_shadow_npt_mmu().
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*/
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if (!nested_npt)
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kvm_mmu_new_pgd(vcpu, cr3, false, false);
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vcpu->arch.cr3 = cr3;
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kvm_register_mark_available(vcpu, VCPU_EXREG_CR3);
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kvm_init_mmu(vcpu, false);
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return 0;
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}
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static void nested_prepare_vmcb_save(struct vcpu_svm *svm, struct vmcb *nested_vmcb)
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{
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/* Load the nested guest state */
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svm->vmcb->save.es = nested_vmcb->save.es;
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svm->vmcb->save.cs = nested_vmcb->save.cs;
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svm->vmcb->save.ss = nested_vmcb->save.ss;
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svm->vmcb->save.ds = nested_vmcb->save.ds;
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svm->vmcb->save.gdtr = nested_vmcb->save.gdtr;
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svm->vmcb->save.idtr = nested_vmcb->save.idtr;
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kvm_set_rflags(&svm->vcpu, nested_vmcb->save.rflags);
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svm_set_efer(&svm->vcpu, nested_vmcb->save.efer);
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svm_set_cr0(&svm->vcpu, nested_vmcb->save.cr0);
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svm_set_cr4(&svm->vcpu, nested_vmcb->save.cr4);
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svm->vmcb->save.cr2 = svm->vcpu.arch.cr2 = nested_vmcb->save.cr2;
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kvm_rax_write(&svm->vcpu, nested_vmcb->save.rax);
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kvm_rsp_write(&svm->vcpu, nested_vmcb->save.rsp);
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kvm_rip_write(&svm->vcpu, nested_vmcb->save.rip);
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/* In case we don't even reach vcpu_run, the fields are not updated */
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svm->vmcb->save.rax = nested_vmcb->save.rax;
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svm->vmcb->save.rsp = nested_vmcb->save.rsp;
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svm->vmcb->save.rip = nested_vmcb->save.rip;
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svm->vmcb->save.dr7 = nested_vmcb->save.dr7;
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svm->vcpu.arch.dr6 = nested_vmcb->save.dr6;
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svm->vmcb->save.cpl = nested_vmcb->save.cpl;
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}
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static void nested_prepare_vmcb_control(struct vcpu_svm *svm)
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{
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const u32 mask = V_INTR_MASKING_MASK | V_GIF_ENABLE_MASK | V_GIF_MASK;
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if (nested_npt_enabled(svm))
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nested_svm_init_mmu_context(&svm->vcpu);
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svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset =
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svm->vcpu.arch.l1_tsc_offset + svm->nested.ctl.tsc_offset;
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svm->vmcb->control.int_ctl =
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(svm->nested.ctl.int_ctl & ~mask) |
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(svm->nested.hsave->control.int_ctl & mask);
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svm->vmcb->control.virt_ext = svm->nested.ctl.virt_ext;
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svm->vmcb->control.int_vector = svm->nested.ctl.int_vector;
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svm->vmcb->control.int_state = svm->nested.ctl.int_state;
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svm->vmcb->control.event_inj = svm->nested.ctl.event_inj;
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svm->vmcb->control.event_inj_err = svm->nested.ctl.event_inj_err;
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svm->vmcb->control.pause_filter_count = svm->nested.ctl.pause_filter_count;
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svm->vmcb->control.pause_filter_thresh = svm->nested.ctl.pause_filter_thresh;
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/* Enter Guest-Mode */
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enter_guest_mode(&svm->vcpu);
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/*
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* Merge guest and host intercepts - must be called with vcpu in
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* guest-mode to take affect here
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*/
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recalc_intercepts(svm);
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vmcb_mark_all_dirty(svm->vmcb);
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}
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int enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
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struct vmcb *nested_vmcb)
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{
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int ret;
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svm->nested.vmcb = vmcb_gpa;
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load_nested_vmcb_control(svm, &nested_vmcb->control);
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nested_prepare_vmcb_save(svm, nested_vmcb);
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nested_prepare_vmcb_control(svm);
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ret = nested_svm_load_cr3(&svm->vcpu, nested_vmcb->save.cr3,
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nested_npt_enabled(svm));
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if (ret)
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return ret;
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svm_set_gif(svm, true);
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|
return 0;
|
|
}
|
|
|
|
int nested_svm_vmrun(struct vcpu_svm *svm)
|
|
{
|
|
int ret;
|
|
struct vmcb *nested_vmcb;
|
|
struct vmcb *hsave = svm->nested.hsave;
|
|
struct vmcb *vmcb = svm->vmcb;
|
|
struct kvm_host_map map;
|
|
u64 vmcb_gpa;
|
|
|
|
if (is_smm(&svm->vcpu)) {
|
|
kvm_queue_exception(&svm->vcpu, UD_VECTOR);
|
|
return 1;
|
|
}
|
|
|
|
vmcb_gpa = svm->vmcb->save.rax;
|
|
ret = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(vmcb_gpa), &map);
|
|
if (ret == -EINVAL) {
|
|
kvm_inject_gp(&svm->vcpu, 0);
|
|
return 1;
|
|
} else if (ret) {
|
|
return kvm_skip_emulated_instruction(&svm->vcpu);
|
|
}
|
|
|
|
ret = kvm_skip_emulated_instruction(&svm->vcpu);
|
|
|
|
nested_vmcb = map.hva;
|
|
|
|
if (!nested_vmcb_checks(svm, nested_vmcb)) {
|
|
nested_vmcb->control.exit_code = SVM_EXIT_ERR;
|
|
nested_vmcb->control.exit_code_hi = 0;
|
|
nested_vmcb->control.exit_info_1 = 0;
|
|
nested_vmcb->control.exit_info_2 = 0;
|
|
goto out;
|
|
}
|
|
|
|
trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb_gpa,
|
|
nested_vmcb->save.rip,
|
|
nested_vmcb->control.int_ctl,
|
|
nested_vmcb->control.event_inj,
|
|
nested_vmcb->control.nested_ctl);
|
|
|
|
trace_kvm_nested_intercepts(nested_vmcb->control.intercept_cr & 0xffff,
|
|
nested_vmcb->control.intercept_cr >> 16,
|
|
nested_vmcb->control.intercept_exceptions,
|
|
nested_vmcb->control.intercept);
|
|
|
|
/* Clear internal status */
|
|
kvm_clear_exception_queue(&svm->vcpu);
|
|
kvm_clear_interrupt_queue(&svm->vcpu);
|
|
|
|
/*
|
|
* Save the old vmcb, so we don't need to pick what we save, but can
|
|
* restore everything when a VMEXIT occurs
|
|
*/
|
|
hsave->save.es = vmcb->save.es;
|
|
hsave->save.cs = vmcb->save.cs;
|
|
hsave->save.ss = vmcb->save.ss;
|
|
hsave->save.ds = vmcb->save.ds;
|
|
hsave->save.gdtr = vmcb->save.gdtr;
|
|
hsave->save.idtr = vmcb->save.idtr;
|
|
hsave->save.efer = svm->vcpu.arch.efer;
|
|
hsave->save.cr0 = kvm_read_cr0(&svm->vcpu);
|
|
hsave->save.cr4 = svm->vcpu.arch.cr4;
|
|
hsave->save.rflags = kvm_get_rflags(&svm->vcpu);
|
|
hsave->save.rip = kvm_rip_read(&svm->vcpu);
|
|
hsave->save.rsp = vmcb->save.rsp;
|
|
hsave->save.rax = vmcb->save.rax;
|
|
if (npt_enabled)
|
|
hsave->save.cr3 = vmcb->save.cr3;
|
|
else
|
|
hsave->save.cr3 = kvm_read_cr3(&svm->vcpu);
|
|
|
|
copy_vmcb_control_area(&hsave->control, &vmcb->control);
|
|
|
|
svm->nested.nested_run_pending = 1;
|
|
|
|
if (enter_svm_guest_mode(svm, vmcb_gpa, nested_vmcb))
|
|
goto out_exit_err;
|
|
|
|
if (nested_svm_vmrun_msrpm(svm))
|
|
goto out;
|
|
|
|
out_exit_err:
|
|
svm->nested.nested_run_pending = 0;
|
|
|
|
svm->vmcb->control.exit_code = SVM_EXIT_ERR;
|
|
svm->vmcb->control.exit_code_hi = 0;
|
|
svm->vmcb->control.exit_info_1 = 0;
|
|
svm->vmcb->control.exit_info_2 = 0;
|
|
|
|
nested_svm_vmexit(svm);
|
|
|
|
out:
|
|
kvm_vcpu_unmap(&svm->vcpu, &map, true);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb)
|
|
{
|
|
to_vmcb->save.fs = from_vmcb->save.fs;
|
|
to_vmcb->save.gs = from_vmcb->save.gs;
|
|
to_vmcb->save.tr = from_vmcb->save.tr;
|
|
to_vmcb->save.ldtr = from_vmcb->save.ldtr;
|
|
to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base;
|
|
to_vmcb->save.star = from_vmcb->save.star;
|
|
to_vmcb->save.lstar = from_vmcb->save.lstar;
|
|
to_vmcb->save.cstar = from_vmcb->save.cstar;
|
|
to_vmcb->save.sfmask = from_vmcb->save.sfmask;
|
|
to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs;
|
|
to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp;
|
|
to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip;
|
|
}
|
|
|
|
int nested_svm_vmexit(struct vcpu_svm *svm)
|
|
{
|
|
int rc;
|
|
struct vmcb *nested_vmcb;
|
|
struct vmcb *hsave = svm->nested.hsave;
|
|
struct vmcb *vmcb = svm->vmcb;
|
|
struct kvm_host_map map;
|
|
|
|
rc = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(svm->nested.vmcb), &map);
|
|
if (rc) {
|
|
if (rc == -EINVAL)
|
|
kvm_inject_gp(&svm->vcpu, 0);
|
|
return 1;
|
|
}
|
|
|
|
nested_vmcb = map.hva;
|
|
|
|
/* Exit Guest-Mode */
|
|
leave_guest_mode(&svm->vcpu);
|
|
svm->nested.vmcb = 0;
|
|
WARN_ON_ONCE(svm->nested.nested_run_pending);
|
|
|
|
/* in case we halted in L2 */
|
|
svm->vcpu.arch.mp_state = KVM_MP_STATE_RUNNABLE;
|
|
|
|
/* Give the current vmcb to the guest */
|
|
svm_set_gif(svm, false);
|
|
|
|
nested_vmcb->save.es = vmcb->save.es;
|
|
nested_vmcb->save.cs = vmcb->save.cs;
|
|
nested_vmcb->save.ss = vmcb->save.ss;
|
|
nested_vmcb->save.ds = vmcb->save.ds;
|
|
nested_vmcb->save.gdtr = vmcb->save.gdtr;
|
|
nested_vmcb->save.idtr = vmcb->save.idtr;
|
|
nested_vmcb->save.efer = svm->vcpu.arch.efer;
|
|
nested_vmcb->save.cr0 = kvm_read_cr0(&svm->vcpu);
|
|
nested_vmcb->save.cr3 = kvm_read_cr3(&svm->vcpu);
|
|
nested_vmcb->save.cr2 = vmcb->save.cr2;
|
|
nested_vmcb->save.cr4 = svm->vcpu.arch.cr4;
|
|
nested_vmcb->save.rflags = kvm_get_rflags(&svm->vcpu);
|
|
nested_vmcb->save.rip = kvm_rip_read(&svm->vcpu);
|
|
nested_vmcb->save.rsp = kvm_rsp_read(&svm->vcpu);
|
|
nested_vmcb->save.rax = kvm_rax_read(&svm->vcpu);
|
|
nested_vmcb->save.dr7 = vmcb->save.dr7;
|
|
nested_vmcb->save.dr6 = svm->vcpu.arch.dr6;
|
|
nested_vmcb->save.cpl = vmcb->save.cpl;
|
|
|
|
nested_vmcb->control.int_state = vmcb->control.int_state;
|
|
nested_vmcb->control.exit_code = vmcb->control.exit_code;
|
|
nested_vmcb->control.exit_code_hi = vmcb->control.exit_code_hi;
|
|
nested_vmcb->control.exit_info_1 = vmcb->control.exit_info_1;
|
|
nested_vmcb->control.exit_info_2 = vmcb->control.exit_info_2;
|
|
|
|
if (nested_vmcb->control.exit_code != SVM_EXIT_ERR)
|
|
nested_vmcb_save_pending_event(svm, nested_vmcb);
|
|
|
|
if (svm->nrips_enabled)
|
|
nested_vmcb->control.next_rip = vmcb->control.next_rip;
|
|
|
|
nested_vmcb->control.int_ctl = svm->nested.ctl.int_ctl;
|
|
nested_vmcb->control.tlb_ctl = svm->nested.ctl.tlb_ctl;
|
|
nested_vmcb->control.event_inj = svm->nested.ctl.event_inj;
|
|
nested_vmcb->control.event_inj_err = svm->nested.ctl.event_inj_err;
|
|
|
|
nested_vmcb->control.pause_filter_count =
|
|
svm->vmcb->control.pause_filter_count;
|
|
nested_vmcb->control.pause_filter_thresh =
|
|
svm->vmcb->control.pause_filter_thresh;
|
|
|
|
/* Restore the original control entries */
|
|
copy_vmcb_control_area(&vmcb->control, &hsave->control);
|
|
|
|
svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset =
|
|
svm->vcpu.arch.l1_tsc_offset;
|
|
|
|
svm->nested.ctl.nested_cr3 = 0;
|
|
|
|
/* Restore selected save entries */
|
|
svm->vmcb->save.es = hsave->save.es;
|
|
svm->vmcb->save.cs = hsave->save.cs;
|
|
svm->vmcb->save.ss = hsave->save.ss;
|
|
svm->vmcb->save.ds = hsave->save.ds;
|
|
svm->vmcb->save.gdtr = hsave->save.gdtr;
|
|
svm->vmcb->save.idtr = hsave->save.idtr;
|
|
kvm_set_rflags(&svm->vcpu, hsave->save.rflags);
|
|
svm_set_efer(&svm->vcpu, hsave->save.efer);
|
|
svm_set_cr0(&svm->vcpu, hsave->save.cr0 | X86_CR0_PE);
|
|
svm_set_cr4(&svm->vcpu, hsave->save.cr4);
|
|
kvm_rax_write(&svm->vcpu, hsave->save.rax);
|
|
kvm_rsp_write(&svm->vcpu, hsave->save.rsp);
|
|
kvm_rip_write(&svm->vcpu, hsave->save.rip);
|
|
svm->vmcb->save.dr7 = 0;
|
|
svm->vmcb->save.cpl = 0;
|
|
svm->vmcb->control.exit_int_info = 0;
|
|
|
|
vmcb_mark_all_dirty(svm->vmcb);
|
|
|
|
trace_kvm_nested_vmexit_inject(nested_vmcb->control.exit_code,
|
|
nested_vmcb->control.exit_info_1,
|
|
nested_vmcb->control.exit_info_2,
|
|
nested_vmcb->control.exit_int_info,
|
|
nested_vmcb->control.exit_int_info_err,
|
|
KVM_ISA_SVM);
|
|
|
|
kvm_vcpu_unmap(&svm->vcpu, &map, true);
|
|
|
|
nested_svm_uninit_mmu_context(&svm->vcpu);
|
|
|
|
rc = nested_svm_load_cr3(&svm->vcpu, hsave->save.cr3, false);
|
|
if (rc)
|
|
return 1;
|
|
|
|
if (npt_enabled)
|
|
svm->vmcb->save.cr3 = hsave->save.cr3;
|
|
|
|
/*
|
|
* Drop what we picked up for L2 via svm_complete_interrupts() so it
|
|
* doesn't end up in L1.
|
|
*/
|
|
svm->vcpu.arch.nmi_injected = false;
|
|
kvm_clear_exception_queue(&svm->vcpu);
|
|
kvm_clear_interrupt_queue(&svm->vcpu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Forcibly leave nested mode in order to be able to reset the VCPU later on.
|
|
*/
|
|
void svm_leave_nested(struct vcpu_svm *svm)
|
|
{
|
|
if (is_guest_mode(&svm->vcpu)) {
|
|
struct vmcb *hsave = svm->nested.hsave;
|
|
struct vmcb *vmcb = svm->vmcb;
|
|
|
|
svm->nested.nested_run_pending = 0;
|
|
leave_guest_mode(&svm->vcpu);
|
|
copy_vmcb_control_area(&vmcb->control, &hsave->control);
|
|
nested_svm_uninit_mmu_context(&svm->vcpu);
|
|
}
|
|
}
|
|
|
|
static int nested_svm_exit_handled_msr(struct vcpu_svm *svm)
|
|
{
|
|
u32 offset, msr, value;
|
|
int write, mask;
|
|
|
|
if (!(svm->nested.ctl.intercept & (1ULL << INTERCEPT_MSR_PROT)))
|
|
return NESTED_EXIT_HOST;
|
|
|
|
msr = svm->vcpu.arch.regs[VCPU_REGS_RCX];
|
|
offset = svm_msrpm_offset(msr);
|
|
write = svm->vmcb->control.exit_info_1 & 1;
|
|
mask = 1 << ((2 * (msr & 0xf)) + write);
|
|
|
|
if (offset == MSR_INVALID)
|
|
return NESTED_EXIT_DONE;
|
|
|
|
/* Offset is in 32 bit units but need in 8 bit units */
|
|
offset *= 4;
|
|
|
|
if (kvm_vcpu_read_guest(&svm->vcpu, svm->nested.ctl.msrpm_base_pa + offset, &value, 4))
|
|
return NESTED_EXIT_DONE;
|
|
|
|
return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
|
|
}
|
|
|
|
static int nested_svm_intercept_ioio(struct vcpu_svm *svm)
|
|
{
|
|
unsigned port, size, iopm_len;
|
|
u16 val, mask;
|
|
u8 start_bit;
|
|
u64 gpa;
|
|
|
|
if (!(svm->nested.ctl.intercept & (1ULL << INTERCEPT_IOIO_PROT)))
|
|
return NESTED_EXIT_HOST;
|
|
|
|
port = svm->vmcb->control.exit_info_1 >> 16;
|
|
size = (svm->vmcb->control.exit_info_1 & SVM_IOIO_SIZE_MASK) >>
|
|
SVM_IOIO_SIZE_SHIFT;
|
|
gpa = svm->nested.ctl.iopm_base_pa + (port / 8);
|
|
start_bit = port % 8;
|
|
iopm_len = (start_bit + size > 8) ? 2 : 1;
|
|
mask = (0xf >> (4 - size)) << start_bit;
|
|
val = 0;
|
|
|
|
if (kvm_vcpu_read_guest(&svm->vcpu, gpa, &val, iopm_len))
|
|
return NESTED_EXIT_DONE;
|
|
|
|
return (val & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
|
|
}
|
|
|
|
static int nested_svm_intercept(struct vcpu_svm *svm)
|
|
{
|
|
u32 exit_code = svm->vmcb->control.exit_code;
|
|
int vmexit = NESTED_EXIT_HOST;
|
|
|
|
switch (exit_code) {
|
|
case SVM_EXIT_MSR:
|
|
vmexit = nested_svm_exit_handled_msr(svm);
|
|
break;
|
|
case SVM_EXIT_IOIO:
|
|
vmexit = nested_svm_intercept_ioio(svm);
|
|
break;
|
|
case SVM_EXIT_READ_CR0 ... SVM_EXIT_WRITE_CR8: {
|
|
u32 bit = 1U << (exit_code - SVM_EXIT_READ_CR0);
|
|
if (svm->nested.ctl.intercept_cr & bit)
|
|
vmexit = NESTED_EXIT_DONE;
|
|
break;
|
|
}
|
|
case SVM_EXIT_READ_DR0 ... SVM_EXIT_WRITE_DR7: {
|
|
u32 bit = 1U << (exit_code - SVM_EXIT_READ_DR0);
|
|
if (svm->nested.ctl.intercept_dr & bit)
|
|
vmexit = NESTED_EXIT_DONE;
|
|
break;
|
|
}
|
|
case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
|
|
/*
|
|
* Host-intercepted exceptions have been checked already in
|
|
* nested_svm_exit_special. There is nothing to do here,
|
|
* the vmexit is injected by svm_check_nested_events.
|
|
*/
|
|
vmexit = NESTED_EXIT_DONE;
|
|
break;
|
|
}
|
|
case SVM_EXIT_ERR: {
|
|
vmexit = NESTED_EXIT_DONE;
|
|
break;
|
|
}
|
|
default: {
|
|
u64 exit_bits = 1ULL << (exit_code - SVM_EXIT_INTR);
|
|
if (svm->nested.ctl.intercept & exit_bits)
|
|
vmexit = NESTED_EXIT_DONE;
|
|
}
|
|
}
|
|
|
|
return vmexit;
|
|
}
|
|
|
|
int nested_svm_exit_handled(struct vcpu_svm *svm)
|
|
{
|
|
int vmexit;
|
|
|
|
vmexit = nested_svm_intercept(svm);
|
|
|
|
if (vmexit == NESTED_EXIT_DONE)
|
|
nested_svm_vmexit(svm);
|
|
|
|
return vmexit;
|
|
}
|
|
|
|
int nested_svm_check_permissions(struct vcpu_svm *svm)
|
|
{
|
|
if (!(svm->vcpu.arch.efer & EFER_SVME) ||
|
|
!is_paging(&svm->vcpu)) {
|
|
kvm_queue_exception(&svm->vcpu, UD_VECTOR);
|
|
return 1;
|
|
}
|
|
|
|
if (svm->vmcb->save.cpl) {
|
|
kvm_inject_gp(&svm->vcpu, 0);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool nested_exit_on_exception(struct vcpu_svm *svm)
|
|
{
|
|
unsigned int nr = svm->vcpu.arch.exception.nr;
|
|
|
|
return (svm->nested.ctl.intercept_exceptions & (1 << nr));
|
|
}
|
|
|
|
static void nested_svm_inject_exception_vmexit(struct vcpu_svm *svm)
|
|
{
|
|
unsigned int nr = svm->vcpu.arch.exception.nr;
|
|
|
|
svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr;
|
|
svm->vmcb->control.exit_code_hi = 0;
|
|
|
|
if (svm->vcpu.arch.exception.has_error_code)
|
|
svm->vmcb->control.exit_info_1 = svm->vcpu.arch.exception.error_code;
|
|
|
|
/*
|
|
* EXITINFO2 is undefined for all exception intercepts other
|
|
* than #PF.
|
|
*/
|
|
if (nr == PF_VECTOR) {
|
|
if (svm->vcpu.arch.exception.nested_apf)
|
|
svm->vmcb->control.exit_info_2 = svm->vcpu.arch.apf.nested_apf_token;
|
|
else if (svm->vcpu.arch.exception.has_payload)
|
|
svm->vmcb->control.exit_info_2 = svm->vcpu.arch.exception.payload;
|
|
else
|
|
svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2;
|
|
} else if (nr == DB_VECTOR) {
|
|
/* See inject_pending_event. */
|
|
kvm_deliver_exception_payload(&svm->vcpu);
|
|
if (svm->vcpu.arch.dr7 & DR7_GD) {
|
|
svm->vcpu.arch.dr7 &= ~DR7_GD;
|
|
kvm_update_dr7(&svm->vcpu);
|
|
}
|
|
} else
|
|
WARN_ON(svm->vcpu.arch.exception.has_payload);
|
|
|
|
nested_svm_vmexit(svm);
|
|
}
|
|
|
|
static void nested_svm_smi(struct vcpu_svm *svm)
|
|
{
|
|
svm->vmcb->control.exit_code = SVM_EXIT_SMI;
|
|
svm->vmcb->control.exit_info_1 = 0;
|
|
svm->vmcb->control.exit_info_2 = 0;
|
|
|
|
nested_svm_vmexit(svm);
|
|
}
|
|
|
|
static void nested_svm_nmi(struct vcpu_svm *svm)
|
|
{
|
|
svm->vmcb->control.exit_code = SVM_EXIT_NMI;
|
|
svm->vmcb->control.exit_info_1 = 0;
|
|
svm->vmcb->control.exit_info_2 = 0;
|
|
|
|
nested_svm_vmexit(svm);
|
|
}
|
|
|
|
static void nested_svm_intr(struct vcpu_svm *svm)
|
|
{
|
|
trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip);
|
|
|
|
svm->vmcb->control.exit_code = SVM_EXIT_INTR;
|
|
svm->vmcb->control.exit_info_1 = 0;
|
|
svm->vmcb->control.exit_info_2 = 0;
|
|
|
|
nested_svm_vmexit(svm);
|
|
}
|
|
|
|
static inline bool nested_exit_on_init(struct vcpu_svm *svm)
|
|
{
|
|
return (svm->nested.ctl.intercept & (1ULL << INTERCEPT_INIT));
|
|
}
|
|
|
|
static void nested_svm_init(struct vcpu_svm *svm)
|
|
{
|
|
svm->vmcb->control.exit_code = SVM_EXIT_INIT;
|
|
svm->vmcb->control.exit_info_1 = 0;
|
|
svm->vmcb->control.exit_info_2 = 0;
|
|
|
|
nested_svm_vmexit(svm);
|
|
}
|
|
|
|
|
|
static int svm_check_nested_events(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
bool block_nested_events =
|
|
kvm_event_needs_reinjection(vcpu) || svm->nested.nested_run_pending;
|
|
struct kvm_lapic *apic = vcpu->arch.apic;
|
|
|
|
if (lapic_in_kernel(vcpu) &&
|
|
test_bit(KVM_APIC_INIT, &apic->pending_events)) {
|
|
if (block_nested_events)
|
|
return -EBUSY;
|
|
if (!nested_exit_on_init(svm))
|
|
return 0;
|
|
nested_svm_init(svm);
|
|
return 0;
|
|
}
|
|
|
|
if (vcpu->arch.exception.pending) {
|
|
if (block_nested_events)
|
|
return -EBUSY;
|
|
if (!nested_exit_on_exception(svm))
|
|
return 0;
|
|
nested_svm_inject_exception_vmexit(svm);
|
|
return 0;
|
|
}
|
|
|
|
if (vcpu->arch.smi_pending && !svm_smi_blocked(vcpu)) {
|
|
if (block_nested_events)
|
|
return -EBUSY;
|
|
if (!nested_exit_on_smi(svm))
|
|
return 0;
|
|
nested_svm_smi(svm);
|
|
return 0;
|
|
}
|
|
|
|
if (vcpu->arch.nmi_pending && !svm_nmi_blocked(vcpu)) {
|
|
if (block_nested_events)
|
|
return -EBUSY;
|
|
if (!nested_exit_on_nmi(svm))
|
|
return 0;
|
|
nested_svm_nmi(svm);
|
|
return 0;
|
|
}
|
|
|
|
if (kvm_cpu_has_interrupt(vcpu) && !svm_interrupt_blocked(vcpu)) {
|
|
if (block_nested_events)
|
|
return -EBUSY;
|
|
if (!nested_exit_on_intr(svm))
|
|
return 0;
|
|
nested_svm_intr(svm);
|
|
return 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int nested_svm_exit_special(struct vcpu_svm *svm)
|
|
{
|
|
u32 exit_code = svm->vmcb->control.exit_code;
|
|
|
|
switch (exit_code) {
|
|
case SVM_EXIT_INTR:
|
|
case SVM_EXIT_NMI:
|
|
case SVM_EXIT_NPF:
|
|
return NESTED_EXIT_HOST;
|
|
case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
|
|
u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE);
|
|
|
|
if (get_host_vmcb(svm)->control.intercept_exceptions & excp_bits)
|
|
return NESTED_EXIT_HOST;
|
|
else if (exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR &&
|
|
svm->vcpu.arch.apf.host_apf_flags)
|
|
/* Trap async PF even if not shadowing */
|
|
return NESTED_EXIT_HOST;
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return NESTED_EXIT_CONTINUE;
|
|
}
|
|
|
|
static int svm_get_nested_state(struct kvm_vcpu *vcpu,
|
|
struct kvm_nested_state __user *user_kvm_nested_state,
|
|
u32 user_data_size)
|
|
{
|
|
struct vcpu_svm *svm;
|
|
struct kvm_nested_state kvm_state = {
|
|
.flags = 0,
|
|
.format = KVM_STATE_NESTED_FORMAT_SVM,
|
|
.size = sizeof(kvm_state),
|
|
};
|
|
struct vmcb __user *user_vmcb = (struct vmcb __user *)
|
|
&user_kvm_nested_state->data.svm[0];
|
|
|
|
if (!vcpu)
|
|
return kvm_state.size + KVM_STATE_NESTED_SVM_VMCB_SIZE;
|
|
|
|
svm = to_svm(vcpu);
|
|
|
|
if (user_data_size < kvm_state.size)
|
|
goto out;
|
|
|
|
/* First fill in the header and copy it out. */
|
|
if (is_guest_mode(vcpu)) {
|
|
kvm_state.hdr.svm.vmcb_pa = svm->nested.vmcb;
|
|
kvm_state.size += KVM_STATE_NESTED_SVM_VMCB_SIZE;
|
|
kvm_state.flags |= KVM_STATE_NESTED_GUEST_MODE;
|
|
|
|
if (svm->nested.nested_run_pending)
|
|
kvm_state.flags |= KVM_STATE_NESTED_RUN_PENDING;
|
|
}
|
|
|
|
if (gif_set(svm))
|
|
kvm_state.flags |= KVM_STATE_NESTED_GIF_SET;
|
|
|
|
if (copy_to_user(user_kvm_nested_state, &kvm_state, sizeof(kvm_state)))
|
|
return -EFAULT;
|
|
|
|
if (!is_guest_mode(vcpu))
|
|
goto out;
|
|
|
|
/*
|
|
* Copy over the full size of the VMCB rather than just the size
|
|
* of the structs.
|
|
*/
|
|
if (clear_user(user_vmcb, KVM_STATE_NESTED_SVM_VMCB_SIZE))
|
|
return -EFAULT;
|
|
if (copy_to_user(&user_vmcb->control, &svm->nested.ctl,
|
|
sizeof(user_vmcb->control)))
|
|
return -EFAULT;
|
|
if (copy_to_user(&user_vmcb->save, &svm->nested.hsave->save,
|
|
sizeof(user_vmcb->save)))
|
|
return -EFAULT;
|
|
|
|
out:
|
|
return kvm_state.size;
|
|
}
|
|
|
|
static int svm_set_nested_state(struct kvm_vcpu *vcpu,
|
|
struct kvm_nested_state __user *user_kvm_nested_state,
|
|
struct kvm_nested_state *kvm_state)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
struct vmcb *hsave = svm->nested.hsave;
|
|
struct vmcb __user *user_vmcb = (struct vmcb __user *)
|
|
&user_kvm_nested_state->data.svm[0];
|
|
struct vmcb_control_area ctl;
|
|
struct vmcb_save_area save;
|
|
u32 cr0;
|
|
|
|
if (kvm_state->format != KVM_STATE_NESTED_FORMAT_SVM)
|
|
return -EINVAL;
|
|
|
|
if (kvm_state->flags & ~(KVM_STATE_NESTED_GUEST_MODE |
|
|
KVM_STATE_NESTED_RUN_PENDING |
|
|
KVM_STATE_NESTED_GIF_SET))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* If in guest mode, vcpu->arch.efer actually refers to the L2 guest's
|
|
* EFER.SVME, but EFER.SVME still has to be 1 for VMRUN to succeed.
|
|
*/
|
|
if (!(vcpu->arch.efer & EFER_SVME)) {
|
|
/* GIF=1 and no guest mode are required if SVME=0. */
|
|
if (kvm_state->flags != KVM_STATE_NESTED_GIF_SET)
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* SMM temporarily disables SVM, so we cannot be in guest mode. */
|
|
if (is_smm(vcpu) && (kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE))
|
|
return -EINVAL;
|
|
|
|
if (!(kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE)) {
|
|
svm_leave_nested(svm);
|
|
goto out_set_gif;
|
|
}
|
|
|
|
if (!page_address_valid(vcpu, kvm_state->hdr.svm.vmcb_pa))
|
|
return -EINVAL;
|
|
if (kvm_state->size < sizeof(*kvm_state) + KVM_STATE_NESTED_SVM_VMCB_SIZE)
|
|
return -EINVAL;
|
|
if (copy_from_user(&ctl, &user_vmcb->control, sizeof(ctl)))
|
|
return -EFAULT;
|
|
if (copy_from_user(&save, &user_vmcb->save, sizeof(save)))
|
|
return -EFAULT;
|
|
|
|
if (!nested_vmcb_check_controls(&ctl))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Processor state contains L2 state. Check that it is
|
|
* valid for guest mode (see nested_vmcb_checks).
|
|
*/
|
|
cr0 = kvm_read_cr0(vcpu);
|
|
if (((cr0 & X86_CR0_CD) == 0) && (cr0 & X86_CR0_NW))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Validate host state saved from before VMRUN (see
|
|
* nested_svm_check_permissions).
|
|
* TODO: validate reserved bits for all saved state.
|
|
*/
|
|
if (!(save.cr0 & X86_CR0_PG))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* All checks done, we can enter guest mode. L1 control fields
|
|
* come from the nested save state. Guest state is already
|
|
* in the registers, the save area of the nested state instead
|
|
* contains saved L1 state.
|
|
*/
|
|
copy_vmcb_control_area(&hsave->control, &svm->vmcb->control);
|
|
hsave->save = save;
|
|
|
|
svm->nested.vmcb = kvm_state->hdr.svm.vmcb_pa;
|
|
load_nested_vmcb_control(svm, &ctl);
|
|
nested_prepare_vmcb_control(svm);
|
|
|
|
out_set_gif:
|
|
svm_set_gif(svm, !!(kvm_state->flags & KVM_STATE_NESTED_GIF_SET));
|
|
return 0;
|
|
}
|
|
|
|
struct kvm_x86_nested_ops svm_nested_ops = {
|
|
.check_events = svm_check_nested_events,
|
|
.get_state = svm_get_nested_state,
|
|
.set_state = svm_set_nested_state,
|
|
};
|