KVM: x86 emulator: inject #UD on access to non-existing CR
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index fa4604e..836e97b 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2520,6 +2520,13 @@
c->dst.type = OP_NONE;
break;
case 0x20: /* mov cr, reg */
+ switch (c->modrm_reg) {
+ case 1:
+ case 5 ... 7:
+ case 9 ... 15:
+ kvm_queue_exception(ctxt->vcpu, UD_VECTOR);
+ goto done;
+ }
c->regs[c->modrm_rm] = ops->get_cr(c->modrm_reg, ctxt->vcpu);
c->dst.type = OP_NONE; /* no writeback */
break;