From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 99246C2BA19 for ; Tue, 14 Apr 2020 10:57:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6CEDE2072D for ; Tue, 14 Apr 2020 10:57:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="hg9ohOO/" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2438763AbgDNK5U (ORCPT ); Tue, 14 Apr 2020 06:57:20 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:56808 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2438371AbgDNKcT (ORCPT ); Tue, 14 Apr 2020 06:32:19 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 03EAScbp068656; Tue, 14 Apr 2020 10:32:03 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2020-01-29; bh=3p1j6Zpc0T5oSWETKEAt6DX6J3lh6Nx7VnHyJQjN88o=; b=hg9ohOO/H2y040DGVoV3f3hZ3F4C5eTBusFLgwwsCa3yQV7EK5g38C7AhA16ctgyTzgi 2J+F8N7mo34fDsOKmzUYbfqFtApM/40MjKs5chnPT8hHeeOA9/fXBAQfEy7bXTqnUfkQ xtAOYgb+ZLz91Ikvg9IWHX3jhWma32r5hNQsU6tC11T/ArsXq+9zgqDOrK/+H0j6LsFK MpTKLtsRkHVPbz9Qm1dZZF+AAqMcqiuUB6qcpUptRsbKrXuHGds/kDHeDvtStUCzRzMz Q6WZmWZnWTAn/cxMCB95AQNiioj+ANu58StQCkDoRB7DcScW7teT+Xnzk+83cGBHCXaC Rw== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by userp2130.oracle.com with ESMTP id 30b5ar3n0k-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 14 Apr 2020 10:32:03 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 03EAVjEL174157; Tue, 14 Apr 2020 10:32:03 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by userp3030.oracle.com with ESMTP id 30bqch8u98-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 14 Apr 2020 10:32:03 +0000 Received: from abhmp0004.oracle.com (abhmp0004.oracle.com [141.146.116.10]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 03EAW2bU013728; Tue, 14 Apr 2020 10:32:02 GMT Received: from linux-1.home (/92.157.90.160) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 14 Apr 2020 03:32:02 -0700 From: Alexandre Chartre To: x86@kernel.org Cc: linux-kernel@vger.kernel.org, jpoimboe@redhat.com, peterz@infradead.org, jthierry@redhat.com, tglx@linutronix.de, alexandre.chartre@oracle.com Subject: [PATCH V3 7/9] x86/speculation: Change __FILL_RETURN_BUFFER to work with objtool Date: Tue, 14 Apr 2020 12:36:16 +0200 Message-Id: <20200414103618.12657-8-alexandre.chartre@oracle.com> X-Mailer: git-send-email 2.18.2 In-Reply-To: <20200414103618.12657-1-alexandre.chartre@oracle.com> References: <20200414103618.12657-1-alexandre.chartre@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9590 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=13 mlxlogscore=897 bulkscore=0 malwarescore=0 phishscore=0 mlxscore=0 spamscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004140087 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9590 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 impostorscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 phishscore=0 spamscore=0 mlxlogscore=957 suspectscore=13 adultscore=0 mlxscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004140086 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Change __FILL_RETURN_BUFFER so that the stack state is deterministically defined for each iteration and that objtool can have an accurate view of the stack. Suggested-by: Peter Zijlstra Signed-off-by: Alexandre Chartre --- arch/x86/include/asm/nospec-branch.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h index 07e95dcb40ad..b0db793fd083 100644 --- a/arch/x86/include/asm/nospec-branch.h +++ b/arch/x86/include/asm/nospec-branch.h @@ -59,8 +59,8 @@ jmp 775b; \ 774: \ dec reg; \ - jnz 771b; \ - add $(BITS_PER_LONG/8) * nr, sp; + add $(BITS_PER_LONG/8) * 2, sp; \ + jnz 771b; #ifdef __ASSEMBLY__ -- 2.18.2