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authorMarcelo Tosatti <mtosatti@redhat.com>2009-06-11 12:07:42 -0300
committerAvi Kivity <avi@redhat.com>2009-09-10 08:32:56 +0300
commit94d8b056a20bac4f9905d6dafcf7b7005207684a (patch)
tree8ab6678b7c9e8372a314f88a0b61572c19a3b992
parent4d88954d6246d7d43bb8903981731002179f1a1c (diff)
KVM: MMU: add kvm_mmu_get_spte_hierarchy helper
Required by EPT misconfiguration handler. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
-rw-r--r--arch/x86/kvm/mmu.c18
-rw-r--r--arch/x86/kvm/mmu.h2
2 files changed, 20 insertions, 0 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index e18f65bf2de7..12974de88aa5 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3038,6 +3038,24 @@ out:
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;
diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
index 016bf7183e9f..61a1b3884b49 100644
--- a/arch/x86/kvm/mmu.h
+++ b/arch/x86/kvm/mmu.h
@@ -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))