KVM: x86 emulator: fix mov r/m, sreg emulation.

mov r/m, sreg generates #UD ins sreg is incorrect.

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 2c27aa4..c3b9334 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2126,12 +2126,11 @@ special_insn:
        case 0x8c: { /* mov r/m, sreg */
                struct kvm_segment segreg;
 
-               if (c->modrm_reg <= 5)
+               if (c->modrm_reg <= VCPU_SREG_GS)
                        kvm_get_segment(ctxt->vcpu, &segreg, c->modrm_reg);
                else {
-                       printk(KERN_INFO "0x8c: Invalid segreg in modrm byte 0x%02x\n",
-                              c->modrm);
-                       goto cannot_emulate;
+                       kvm_queue_exception(ctxt->vcpu, UD_VECTOR);
+                       goto done;
                }
                c->dst.val = segreg.selector;
                break;