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KVM: VMX: skip vmx->rmode.vm86_active check on cr0 write if unrestricted guest is enabled 

vmx->rmode.vm86_active is never true is unrestricted guest is enabled.
Make it more explicit that neither enter_pmode() nor enter_rmode() is
called in this case.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Gleb Natapov 2013-01-21 15:36:45 +02:00 committed by Marcelo Tosatti
parent 286da4156d
commit 218e763f45
1 changed files with 6 additions and 8 deletions
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6
arch/x86/kvm/vmx.c
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@ -2877,9 +2877,6 @@ static void enter_rmode(struct kvm_vcpu *vcpu)
unsigned long flags;
struct vcpu_vmx *vmx = to_vmx(vcpu);
if (enable_unrestricted_guest)
return;
vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_TR], VCPU_SREG_TR);
vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_ES], VCPU_SREG_ES);
vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_DS], VCPU_SREG_DS);
@ -3086,7 +3083,7 @@ static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
if (enable_unrestricted_guest)
hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST)
| KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST;
else
else {
hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON;
if (vmx->rmode.vm86_active && (cr0 & X86_CR0_PE))
@ -3094,6 +3091,7 @@ static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
if (!vmx->rmode.vm86_active && !(cr0 & X86_CR0_PE))
enter_rmode(vcpu);
}
#ifdef CONFIG_X86_64
if (vcpu->arch.efer & EFER_LME) {