diff options
| author | Avi Kivity <avi@redhat.com> | 2011-03-07 14:54:28 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-05-11 07:56:54 -0400 |
| commit | f4c63e5d5a356b652a3d984edbefca289176c40f (patch) | |
| tree | 90c505354b7c8562da59d67c8704da88904ca8f9 /arch/x86/kvm/vmx.c | |
| parent | 6de12732c42c7070af42e3d6e42ecee2838fc920 (diff) | |
KVM: VMX: Optimize vmx_get_cpl()
In long mode, vm86 mode is disallowed, so we need not check for
it. Reading rflags.vm may require a VMREAD, so it is expensive.
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/vmx.c')
| -rw-r--r-- | 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 4d117072acf8..e8a35ee00735 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -2120,7 +2120,8 @@ static int vmx_get_cpl(struct kvm_vcpu *vcpu) if (!is_protmode(vcpu)) return 0; - if (kvm_get_rflags(vcpu) & X86_EFLAGS_VM) /* if virtual 8086 */ + if (!is_long_mode(vcpu) + && (kvm_get_rflags(vcpu) & X86_EFLAGS_VM)) /* if virtual 8086 */ return 3; return vmcs_read16(GUEST_CS_SELECTOR) & 3; |