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-rw-r--r--arch/x86/kvm/mmu.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
index bb8c86eefa..60f21bb4c2 100644
--- a/arch/x86/kvm/mmu.h
+++ b/arch/x86/kvm/mmu.h
@@ -146,6 +146,14 @@ static inline unsigned long kvm_get_active_pcid(struct kvm_vcpu *vcpu)
return kvm_get_pcid(vcpu, kvm_read_cr3(vcpu));
}
+static inline unsigned long kvm_get_active_cr3_lam_bits(struct kvm_vcpu *vcpu)
+{
+ if (!guest_can_use(vcpu, X86_FEATURE_LAM))
+ return 0;
+
+ return kvm_read_cr3(vcpu) & (X86_CR3_LAM_U48 | X86_CR3_LAM_U57);
+}
+
static inline void kvm_mmu_load_pgd(struct kvm_vcpu *vcpu)
{
u64 root_hpa = vcpu->arch.mmu->root.hpa;