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authorAvi Kivity <avi@redhat.com>2009-08-04 15:02:54 +0300
committerAvi Kivity <avi@redhat.com>2009-09-10 08:33:21 +0300
commiteab4b8aa34fc64e3a91358e1612e6d059396193b (patch)
tree0cdb3e72ff84cdbbd9a77afa80be209e15c91408 /arch/x86/kvm
parent07708c4af1346ab1521b26a202f438366b7bcffd (diff)
KVM: VMX: Optimize vmx_get_cpl()
Instead of calling vmx_get_segment() (which reads a whole bunch of vmcs fields), read only the cs selector which contains the cpl. Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
-rw-r--r--arch/x86/kvm/vmx.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 32e6d2031ba..0ba706e87c5 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1773,16 +1773,13 @@ static void vmx_get_segment(struct kvm_vcpu *vcpu,
static int vmx_get_cpl(struct kvm_vcpu *vcpu)
{
- struct kvm_segment kvm_seg;
-
if (!(vcpu->arch.cr0 & X86_CR0_PE)) /* if real mode */
return 0;
if (vmx_get_rflags(vcpu) & X86_EFLAGS_VM) /* if virtual 8086 */
return 3;
- vmx_get_segment(vcpu, &kvm_seg, VCPU_SREG_CS);
- return kvm_seg.selector & 3;
+ return vmcs_read16(GUEST_CS_SELECTOR) & 3;
}
static u32 vmx_segment_access_rights(struct kvm_segment *var)