From 80890006167ec3e570bfd7cee7a05db17d339726 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Wed, 13 Jun 2012 16:33:29 +0300 Subject: [PATCH] KVM: x86 emulator: implement LTR Opcode 0F 00 /3. Encountered during Windows XP secondary processor bringup. Signed-off-by: Avi Kivity --- 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 92a1add..97d9a99 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -3033,6 +3033,15 @@ static int em_lldt(struct x86_emulate_ctxt *ctxt) return load_segment_descriptor(ctxt, sel, VCPU_SREG_LDTR); } +static int em_ltr(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_TR); +} + static int em_invlpg(struct x86_emulate_ctxt *ctxt) { int rc; @@ -3579,7 +3588,7 @@ static struct opcode group6[] = { DI(Prot, sldt), DI(Prot, str), II(Prot | Priv | SrcMem16, em_lldt, lldt), - DI(Prot | Priv, ltr), + II(Prot | Priv | SrcMem16, em_ltr, ltr), N, N, N, N, }; -- 2.7.4