KVM: x86 emulator: emulate LLDT

Opcode 0F 00 /2. Used by isolinux durign the protected mode transition.

Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index cfa5cc30c1d9798c50bfcadd5900ecf4cc7d4f79..7b575adaf1fdf7a21408fb1e7ab8976c407a699f 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -3015,6 +3015,15 @@ static int em_mov_sreg_rm(struct x86_emulate_ctxt *ctxt)
        return load_segment_descriptor(ctxt, sel, ctxt->modrm_reg);
 }
 
+static int em_lldt(struct x86_emulate_ctxt *ctxt)
+{
+       u16 sel = ctxt->src.val;
+
+       /* Disable writeback. */
+       ctxt->dst.type = OP_NONE;
+       return load_segment_descriptor(ctxt, sel, VCPU_SREG_LDTR);
+}
+
 static int em_invlpg(struct x86_emulate_ctxt *ctxt)
 {
        int rc;
@@ -3560,7 +3569,7 @@ static struct opcode group5[] = {
 static struct opcode group6[] = {
        DI(Prot,        sldt),
        DI(Prot,        str),
-       DI(Prot | Priv, lldt),
+       II(Prot | Priv | SrcMem16, em_lldt, lldt),
        DI(Prot | Priv, ltr),
        N, N, N, N,
 };