Commit 94d8b056 authored by Marcelo Tosatti's avatar Marcelo Tosatti Committed by Avi Kivity
Browse files

KVM: MMU: add kvm_mmu_get_spte_hierarchy helper 



Required by EPT misconfiguration handler.

Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 4d88954d

arch/x86/kvm/mmu.c

+18 −0
Original line number Diff line number Diff line
@@ -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;

arch/x86/kvm/mmu.h

+2 −0
Original line number Diff line number Diff line
@@ -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))