Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753510AbaFBPeg (ORCPT ); Mon, 2 Jun 2014 11:34:36 -0400 Received: from mailgw12.technion.ac.il ([132.68.225.12]:51781 "EHLO mailgw12.technion.ac.il" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752139AbaFBPed (ORCPT ); Mon, 2 Jun 2014 11:34:33 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AusBADuZjFOERCABjGdsb2JhbABYxwcBgRMWDgEBASc8giYBBSdSEFFXGYhCzg+FLReNbmQHFoQqBIofpkmBag X-IPAS-Result: AusBADuZjFOERCABjGdsb2JhbABYxwcBgRMWDgEBASc8giYBBSdSEFFXGYhCzg+FLReNbmQHFoQqBIofpkmBag X-IronPort-AV: E=Sophos;i="4.98,957,1392156000"; d="scan'208";a="109853143" From: Nadav Amit To: pbonzini@redhat.com Cc: gleb@kernel.org, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Nadav Amit Subject: [PATCH 2/9] KVM: x86: Emulator ignores LDTR/TR extended base on LLDT/LTR Date: Mon, 2 Jun 2014 18:34:04 +0300 Message-Id: <1401723251-8034-3-git-send-email-namit@cs.technion.ac.il> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1401723251-8034-1-git-send-email-namit@cs.technion.ac.il> References: <1401723251-8034-1-git-send-email-namit@cs.technion.ac.il> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The current implementation ignores the LDTR/TR base high 32-bits on long-mode. As a result the loaded segment descriptor may be incorrect. Signed-off-by: Nadav Amit --- arch/x86/kvm/emulate.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 8ec4a3e..136088f 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -1422,6 +1422,7 @@ static int __load_segment_descriptor(struct x86_emulate_ctxt *ctxt, ulong desc_addr; int ret; u16 dummy; + u32 base3 = 0; memset(&seg_desc, 0, sizeof seg_desc); @@ -1538,9 +1539,14 @@ static int __load_segment_descriptor(struct x86_emulate_ctxt *ctxt, ret = write_segment_descriptor(ctxt, selector, &seg_desc); if (ret != X86EMUL_CONTINUE) return ret; + } else if (ctxt->mode == X86EMUL_MODE_PROT64) { + ret = ctxt->ops->read_std(ctxt, desc_addr+8, &base3, + sizeof(base3), &ctxt->exception); + if (ret != X86EMUL_CONTINUE) + return ret; } load: - ctxt->ops->set_segment(ctxt, selector, &seg_desc, 0, seg); + ctxt->ops->set_segment(ctxt, selector, &seg_desc, base3, seg); return X86EMUL_CONTINUE; exception: emulate_exception(ctxt, err_vec, err_code, true); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/