| From | Sean Christopherson <> | Subject | [PATCH v3 08/37] KVM: VMX: Skip global INVVPID fallback if vpid==0 in vpid_sync_context() | Date | Fri, 20 Mar 2020 14:28:04 -0700 |
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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 <sean.j.christopherson@intel.com> --- 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 45eaedee2ac0..33645a8e5463 100644 --- a/arch/x86/kvm/vmx/ops.h +++ b/arch/x86/kvm/vmx/ops.h @@ -285,7 +285,7 @@ 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(); } -- 2.24.1
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