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KVM: SVM: Initialize Nested Nested MMU context on VMRUN
This patch adds code to initialize the Nested Nested Paging MMU context when the L1 guest executes a VMRUN instruction and has nested paging enabled in its VMCB. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
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@ -2962,6 +2962,7 @@ void kvm_mmu_unload(struct kvm_vcpu *vcpu)
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{
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mmu_free_roots(vcpu);
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}
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EXPORT_SYMBOL_GPL(kvm_mmu_unload);
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static void mmu_pte_write_zap_pte(struct kvm_vcpu *vcpu,
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struct kvm_mmu_page *sp,
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@ -294,6 +294,15 @@ static inline void flush_guest_tlb(struct kvm_vcpu *vcpu)
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force_new_asid(vcpu);
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}
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static int get_npt_level(void)
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{
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#ifdef CONFIG_X86_64
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return PT64_ROOT_LEVEL;
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#else
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return PT32E_ROOT_LEVEL;
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#endif
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}
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static void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
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{
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vcpu->arch.efer = efer;
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@ -1630,6 +1639,26 @@ static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu)
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nested_svm_vmexit(svm);
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}
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static int nested_svm_init_mmu_context(struct kvm_vcpu *vcpu)
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{
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int r;
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r = kvm_init_shadow_mmu(vcpu, &vcpu->arch.mmu);
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vcpu->arch.mmu.set_cr3 = nested_svm_set_tdp_cr3;
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vcpu->arch.mmu.get_cr3 = nested_svm_get_tdp_cr3;
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vcpu->arch.mmu.inject_page_fault = nested_svm_inject_npf_exit;
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vcpu->arch.mmu.shadow_root_level = get_npt_level();
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vcpu->arch.walk_mmu = &vcpu->arch.nested_mmu;
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return r;
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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.walk_mmu = &vcpu->arch.mmu;
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}
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static int nested_svm_check_permissions(struct vcpu_svm *svm)
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{
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if (!(svm->vcpu.arch.efer & EFER_SVME)
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@ -1998,6 +2027,8 @@ static int nested_svm_vmexit(struct vcpu_svm *svm)
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kvm_clear_exception_queue(&svm->vcpu);
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kvm_clear_interrupt_queue(&svm->vcpu);
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svm->nested.nested_cr3 = 0;
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/* Restore selected save entries */
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svm->vmcb->save.es = hsave->save.es;
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svm->vmcb->save.cs = hsave->save.cs;
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@ -2024,6 +2055,7 @@ static int nested_svm_vmexit(struct vcpu_svm *svm)
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nested_svm_unmap(page);
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nested_svm_uninit_mmu_context(&svm->vcpu);
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kvm_mmu_reset_context(&svm->vcpu);
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kvm_mmu_load(&svm->vcpu);
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@ -2071,6 +2103,9 @@ static bool nested_vmcb_checks(struct vmcb *vmcb)
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if (vmcb->control.asid == 0)
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return false;
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if (vmcb->control.nested_ctl && !npt_enabled)
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return false;
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return true;
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}
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@ -2143,6 +2178,12 @@ static bool nested_svm_vmrun(struct vcpu_svm *svm)
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else
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svm->vcpu.arch.hflags &= ~HF_HIF_MASK;
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if (nested_vmcb->control.nested_ctl) {
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kvm_mmu_unload(&svm->vcpu);
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svm->nested.nested_cr3 = nested_vmcb->control.nested_cr3;
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nested_svm_init_mmu_context(&svm->vcpu);
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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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@ -3415,15 +3456,6 @@ static bool svm_cpu_has_accelerated_tpr(void)
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return false;
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}
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static int get_npt_level(void)
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{
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#ifdef CONFIG_X86_64
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return PT64_ROOT_LEVEL;
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#else
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return PT32E_ROOT_LEVEL;
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#endif
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}
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static u64 svm_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
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{
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return 0;
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