From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: [PATCH 5/5] KVM: x86 emulator: implement LTR Date: Wed, 27 Jun 2012 18:19:08 +0300 Message-ID: <1340810369-25392-11-git-send-email-avi@redhat.com> References: <1340810369-25392-1-git-send-email-avi@redhat.com> Cc: kvm@vger.kernel.org To: Marcelo Tosatti Return-path: Received: from mx1.redhat.com ([209.132.183.28]:8677 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757735Ab2F0PTs (ORCPT ); Wed, 27 Jun 2012 11:19:48 -0400 Received: from int-mx12.intmail.prod.int.phx2.redhat.com (int-mx12.intmail.prod.int.phx2.redhat.com [10.5.11.25]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id q5RFJm0q000888 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Wed, 27 Jun 2012 11:19:48 -0400 In-Reply-To: <1340810369-25392-1-git-send-email-avi@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: 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 dff416f..218e731 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -3024,6 +3024,15 @@ 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; @@ -3570,7 +3579,7 @@ static int check_perm_out(struct x86_emulate_ctxt *ctxt) 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, }; -- 1.7.10.1