kvm: vmx: Don't use INVVPID when EPT is enabled

According to the Intel SDM, volume 3, section 28.3.2: Creating and
Using Cached Translation Information, "No linear mappings are used
while EPT is in use." INVEPT will invalidate both the guest-physical
mappings and the combined mappings in the TLBs and paging-structure
caches, so an INVVPID is superfluous.

Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 2ee00db..eb776b6 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -4017,11 +4017,12 @@ static void exit_lmode(struct kvm_vcpu *vcpu)
 
 static inline void __vmx_flush_tlb(struct kvm_vcpu *vcpu, int vpid)
 {
-       vpid_sync_context(vpid);
        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(vpid);
        }
 }