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>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 20409bd..319e840 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2877,9 +2877,6 @@
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 @@
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) {