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KVM: MMU: add kvm_mmu_get_spte_hierarchy helper

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Required by EPT misconfiguration handler.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Marcelo Tosatti 2009-06-11 12:07:42 -03:00 committed by Avi Kivity
parent 4d88954d62
commit 94d8b056a2
2 changed files with 20 additions and 0 deletions
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18
arch/x86/kvm/mmu.c
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@ -3038,6 +3038,24 @@ int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes,
return r;
}
int kvm_mmu_get_spte_hierarchy(struct kvm_vcpu *vcpu, u64 addr, u64 sptes[4])
{
struct kvm_shadow_walk_iterator iterator;
int nr_sptes = 0;
spin_lock(&vcpu->kvm->mmu_lock);
for_each_shadow_entry(vcpu, addr, iterator) {
sptes[iterator.level-1] = *iterator.sptep;
nr_sptes++;
if (!is_shadow_present_pte(*iterator.sptep))
break;
}
spin_unlock(&vcpu->kvm->mmu_lock);
return nr_sptes;
}
EXPORT_SYMBOL_GPL(kvm_mmu_get_spte_hierarchy);
#ifdef AUDIT
static const char *audit_msg;

2
arch/x86/kvm/mmu.h
View File

@ -37,6 +37,8 @@
#define PT32_ROOT_LEVEL 2
#define PT32E_ROOT_LEVEL 3
int kvm_mmu_get_spte_hierarchy(struct kvm_vcpu *vcpu, u64 addr, u64 sptes[4]);
static inline void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
{
if (unlikely(vcpu->kvm->arch.n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES))