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| author | Gleb Natapov <gleb@redhat.com> | 2013-01-21 15:36:45 +0200 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2013-01-24 00:40:28 -0200 |
| commit | 218e763f458c44f30041c1b48b4371e130fd4317 (patch) | |
| tree | 60c7a2053174f650133468f69836e3a56e0795d6 /arch/x86/kvm | |
| parent | 286da4156dc65c8a054580fdd96b7709132dce8d (diff) | |
| download | lwn-218e763f458c44f30041c1b48b4371e130fd4317.tar.gz lwn-218e763f458c44f30041c1b48b4371e130fd4317.zip | |
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>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 20409bd5eb4a..319e840e2ada 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -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); @@ -3086,14 +3083,15 @@ 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)) - enter_pmode(vcpu); + if (vmx->rmode.vm86_active && (cr0 & X86_CR0_PE)) + enter_pmode(vcpu); - if (!vmx->rmode.vm86_active && !(cr0 & X86_CR0_PE)) - enter_rmode(vcpu); + if (!vmx->rmode.vm86_active && !(cr0 & X86_CR0_PE)) + enter_rmode(vcpu); + } #ifdef CONFIG_X86_64 if (vcpu->arch.efer & EFER_LME) { |