Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752225AbaFONNR (ORCPT ); Sun, 15 Jun 2014 09:13:17 -0400 Received: from mailgw12.technion.ac.il ([132.68.225.12]:34693 "EHLO mailgw12.technion.ac.il" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752167AbaFONNM (ORCPT ); Sun, 15 Jun 2014 09:13:12 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgECAPuanVOERCABjGdsb2JhbABariIBAQaZJAGBABYPAQEBJzyEBAEFJ1IQUVcZiELJWIUmF4VjiC9kBxaELQSKOaclgWs X-IPAS-Result: AgECAPuanVOERCABjGdsb2JhbABariIBAQaZJAGBABYPAQEBJzyEBAEFJ1IQUVcZiELJWIUmF4VjiC9kBxaELQSKOaclgWs X-IronPort-AV: E=Sophos;i="5.01,481,1400014800"; d="scan'208";a="111523994" 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 1/6] KVM: x86: bit-ops emulation ignores offset on 64-bit Date: Sun, 15 Jun 2014 16:12:57 +0300 Message-Id: <1402837982-24959-2-git-send-email-namit@cs.technion.ac.il> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1402837982-24959-1-git-send-email-namit@cs.technion.ac.il> References: <1402837982-24959-1-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 emulation of bit operations ignores the offset from the destination on 64-bit target memory operands. This patch fixes this behavior. Signed-off-by: Nadav Amit --- arch/x86/kvm/emulate.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index e4e833d..f0b0a10 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -1220,12 +1220,14 @@ static void fetch_bit_operand(struct x86_emulate_ctxt *ctxt) long sv = 0, mask; if (ctxt->dst.type == OP_MEM && ctxt->src.type == OP_REG) { - mask = ~(ctxt->dst.bytes * 8 - 1); + mask = ~((long)ctxt->dst.bytes * 8 - 1); if (ctxt->src.bytes == 2) sv = (s16)ctxt->src.val & (s16)mask; else if (ctxt->src.bytes == 4) sv = (s32)ctxt->src.val & (s32)mask; + else + sv = (s64)ctxt->src.val & (s64)mask; ctxt->dst.addr.mem.ea += (sv >> 3); } -- 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/