[PATCH v2 22/26] KVM: x86 emulator: emulate LLDT

Avi Kivity
2012-06-27T15:20:23Z

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

Signed-off-by: Avi Kivity <avi@redhat.com>
---
arch/x86/kvm/emulate.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index cfa5cc3..7b575ad 100644
--- 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 int check_perm_out(struct x86_emulate_ctxt *ctxt)
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,
};
--
1.7.11