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

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 (file)
--- 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) {