KVM: Modify guest segments after potentially switching modes

The SET_SREGS ioctl modifies both cr0.pe (real mode/protected mode) and
guest segment registers.  Since segment handling is modified by the mode on
Intel procesors, update the segment registers after the mode switch has taken
place.
Signed-off-by: NAvi Kivity <avi@qumranet.com>

drivers/kvm/kvm_main.c

@@ -1904,16 +1904,6 @@ static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 
 	vcpu_load(vcpu);
 
-	set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
-	set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
-	set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
-	set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
-	set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
-	set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
-
-	set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
-	set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
-
 	dt.limit = sregs->idt.limit;
 	dt.base = sregs->idt.base;
 	kvm_arch_ops->set_idt(vcpu, &dt);
@@ -1953,6 +1943,16 @@ static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 		if (vcpu->irq_pending[i])
 			__set_bit(i, &vcpu->irq_summary);
 
+	set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
+	set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
+	set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
+	set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
+	set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
+	set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
+
+	set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
+	set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
+
 	vcpu_put(vcpu);
 
 	return 0;