KVM: VMX: Force vm86 mode if setting flags during real mode

patch 78f78268 in mainline.

When resetting from userspace, we need to handle the flags being cleared
even after we are in real mode.
Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/kvm/vmx.c

@@ -463,6 +463,8 @@ static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu)
 
 static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
 {
+	if (vcpu->rmode.active)
+		rflags |= IOPL_MASK | X86_EFLAGS_VM;
 	vmcs_writel(GUEST_RFLAGS, rflags);
 }