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KVM: VMX: Skip global INVVPID fallback if vpid==0 in vpid_sync_context()

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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>
Message-Id: <20200320212833.3507-9-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2020-03-20 14:28:04 -07:00 committed by Paolo Bonzini
parent ee1fa209f5
commit c746b3a4b8
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/vmx/ops.h
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@ -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();
}