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KVM: VMX: Optimize vmx_get_cpl()

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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>
This commit is contained in:
Avi Kivity 2009-08-04 15:02:54 +03:00
parent 07708c4af1
commit eab4b8aa34
1 changed files with 1 additions and 4 deletions
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5
arch/x86/kvm/vmx.c
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@ -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)