[PATCH] KVM: VMX: call invvpid only when EPT is disabled

[Davidlohr Bueso <dave@gnu.org>]

From: Davidlohr Bueso <dave@gnu.org>

With EPT enabled it is not required to explicitly run invvpid to invalidate tagged TLB entries, as
KVM does not force vm-exits for cr3 writes and invlpg. Run invvpid only when these instructions
are emulated and shadow pages are used.

Signed-off-by: Davidlohr Bueso <dave@gnu.org>
---
 arch/x86/kvm/vmx.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 2c22fc7..51c7fb9 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2861,12 +2861,13 @@ static void exit_lmode(struct kvm_vcpu *vcpu)
 
 static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
 {
-	vpid_sync_context(to_vmx(vcpu));
 	if (enable_ept) {
 		if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
 			return;
 		ept_sync_context(construct_eptp(vcpu->arch.mmu.root_hpa));
 	}
+	else
+		vpid_sync_context(to_vmx(vcpu));
 }
 
 static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu)
-- 
1.7.4.1