From c746b3a4b84cc6eb2f8a45e89210f57d252d98fd Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Fri, 20 Mar 2020 14:28:04 -0700 Subject: [PATCH] KVM: VMX: Skip global INVVPID fallback if vpid==0 in vpid_sync_context() Skip the global INVVPID in the unlikely scenario that vpid==0 and the SINGLE_CONTEXT variant of INVVPID is unsupported. If vpid==0, there's no need to INVVPID as it's impossible to do VM-Enter with VPID enabled and vmcs.VPID==0, i.e. there can't be any TLB entries for the vCPU with vpid==0. The fact that the SINGLE_CONTEXT variant isn't supported is irrelevant. Signed-off-by: Sean Christopherson Message-Id: <20200320212833.3507-9-sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini --- arch/x86/kvm/vmx/ops.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx/ops.h b/arch/x86/kvm/vmx/ops.h index 19717d0a1100..a1cb6d4114dc 100644 --- a/arch/x86/kvm/vmx/ops.h +++ b/arch/x86/kvm/vmx/ops.h @@ -300,7 +300,7 @@ static inline void vpid_sync_context(int vpid) { if (cpu_has_vmx_invvpid_single()) vpid_sync_vcpu_single(vpid); - else + else if (vpid != 0) vpid_sync_vcpu_global(); }