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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>
This commit is contained in:
Joerg Roedel 2010-09-10 17:31:03 +02:00 committed by Avi Kivity
parent 5bd2edc341
commit 4b16184c1c
2 changed files with 42 additions and 9 deletions
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1
arch/x86/kvm/mmu.c
View File

@ -2962,6 +2962,7 @@ void kvm_mmu_unload(struct kvm_vcpu *vcpu)
{
mmu_free_roots(vcpu);
}
EXPORT_SYMBOL_GPL(kvm_mmu_unload);
static void mmu_pte_write_zap_pte(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *sp,

50
arch/x86/kvm/svm.c
View File

@ -294,6 +294,15 @@ static inline void flush_guest_tlb(struct kvm_vcpu *vcpu)
force_new_asid(vcpu);
}
static int get_npt_level(void)
{
#ifdef CONFIG_X86_64
return PT64_ROOT_LEVEL;
#else
return PT32E_ROOT_LEVEL;
#endif
}
static void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
{
vcpu->arch.efer = efer;
@ -1630,6 +1639,26 @@ static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu)
nested_svm_vmexit(svm);
}
static int nested_svm_init_mmu_context(struct kvm_vcpu *vcpu)
{
int r;
r = kvm_init_shadow_mmu(vcpu, &vcpu->arch.mmu);
vcpu->arch.mmu.set_cr3 = nested_svm_set_tdp_cr3;
vcpu->arch.mmu.get_cr3 = nested_svm_get_tdp_cr3;
vcpu->arch.mmu.inject_page_fault = nested_svm_inject_npf_exit;
vcpu->arch.mmu.shadow_root_level = get_npt_level();
vcpu->arch.walk_mmu = &vcpu->arch.nested_mmu;
return r;
}
static void nested_svm_uninit_mmu_context(struct kvm_vcpu *vcpu)
{
vcpu->arch.walk_mmu = &vcpu->arch.mmu;
}
static int nested_svm_check_permissions(struct vcpu_svm *svm)
{
if (!(svm->vcpu.arch.efer & EFER_SVME)
@ -1998,6 +2027,8 @@ static int nested_svm_vmexit(struct vcpu_svm *svm)
kvm_clear_exception_queue(&svm->vcpu);
kvm_clear_interrupt_queue(&svm->vcpu);
svm->nested.nested_cr3 = 0;
/* Restore selected save entries */
svm->vmcb->save.es = hsave->save.es;
svm->vmcb->save.cs = hsave->save.cs;
@ -2024,6 +2055,7 @@ static int nested_svm_vmexit(struct vcpu_svm *svm)
nested_svm_unmap(page);
nested_svm_uninit_mmu_context(&svm->vcpu);
kvm_mmu_reset_context(&svm->vcpu);
kvm_mmu_load(&svm->vcpu);
@ -2071,6 +2103,9 @@ static bool nested_vmcb_checks(struct vmcb *vmcb)
if (vmcb->control.asid == 0)
return false;
if (vmcb->control.nested_ctl && !npt_enabled)
return false;
return true;
}
@ -2143,6 +2178,12 @@ static bool nested_svm_vmrun(struct vcpu_svm *svm)
else
svm->vcpu.arch.hflags &= ~HF_HIF_MASK;
if (nested_vmcb->control.nested_ctl) {
kvm_mmu_unload(&svm->vcpu);
svm->nested.nested_cr3 = nested_vmcb->control.nested_cr3;
nested_svm_init_mmu_context(&svm->vcpu);
}
/* Load the nested guest state */
svm->vmcb->save.es = nested_vmcb->save.es;
svm->vmcb->save.cs = nested_vmcb->save.cs;
@ -3415,15 +3456,6 @@ static bool svm_cpu_has_accelerated_tpr(void)
return false;
}
static int get_npt_level(void)
{
#ifdef CONFIG_X86_64
return PT64_ROOT_LEVEL;
#else
return PT32E_ROOT_LEVEL;
#endif
}
static u64 svm_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
{
return 0;