Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753641AbaFBPei (ORCPT ); Mon, 2 Jun 2014 11:34:38 -0400 Received: from mailgw12.technion.ac.il ([132.68.225.12]:7149 "EHLO mailgw12.technion.ac.il" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752020AbaFBPed (ORCPT ); Mon, 2 Jun 2014 11:34:33 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AusBADuZjFOERCABjGdsb2JhbABYxwcBgRMWDgEBASc8giYBBSdSEFFXGYhCzg+FLReOUgcWhCoEih+mSQ X-IPAS-Result: AusBADuZjFOERCABjGdsb2JhbABYxwcBgRMWDgEBASc8giYBBSdSEFFXGYhCzg+FLReOUgcWhCoEih+mSQ X-IronPort-AV: E=Sophos;i="4.98,957,1392156000"; d="scan'208";a="109853133" 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 1/9] KVM: x86: Mark VEX-prefix instructions emulation as unimplemented Date: Mon, 2 Jun 2014 18:34:03 +0300 Message-Id: <1401723251-8034-2-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 Currently the emulator does not recognize vex-prefix instructions. However, it may incorrectly decode lgdt/lidt instructions and try to execute them. This patch returns unhandlable error on their emulation. Signed-off-by: Nadav Amit --- arch/x86/kvm/emulate.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index e4e833d..8ec4a3e 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -4314,6 +4314,13 @@ done_prefixes: if (ctxt->d & ModRM) ctxt->modrm = insn_fetch(u8, ctxt); + /* vex-prefix instructions are not implemented */ + if (ctxt->opcode_len == 1 && (ctxt->b == 0xc5 || ctxt->b == 0xc4) && + (mode == X86EMUL_MODE_PROT64 || + (mode >= X86EMUL_MODE_PROT16 && (ctxt->modrm & 0x80)))) { + ctxt->d = NotImpl; + } + while (ctxt->d & GroupMask) { switch (ctxt->d & GroupMask) { case Group: -- 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/