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=-12.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 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 0F4E0C433E9 for ; Fri, 15 Jan 2021 00:34:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D790C23AAA for ; Fri, 15 Jan 2021 00:34:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731402AbhAOAeM (ORCPT ); Thu, 14 Jan 2021 19:34:12 -0500 Received: from aserp2130.oracle.com ([141.146.126.79]:55444 "EHLO aserp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729048AbhAOAeL (ORCPT ); Thu, 14 Jan 2021 19:34:11 -0500 Received: from pps.filterd (aserp2130.oracle.com [127.0.0.1]) by aserp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 10F0F1Sm192568; Fri, 15 Jan 2021 00:33:14 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=subject : to : cc : references : from : message-id : date : mime-version : in-reply-to : content-type : content-transfer-encoding; s=corp-2020-01-29; bh=EoYf07ye+2pvEM8W2e9X5zV3+hXXa21IpM2ZAyZNnz4=; b=XE7kWDv7toO88nfu3YaqyDyntOiUkYXKCmJ+K04xbeuMnf28mzsk2SfsbUs58ZtV7rHt St3M57Q6yUYe18yF6RZ/7aNMfBVNIvd8T9WgpIE9jj42WeMhZLV+mreISV9iV310A9fB vq5DpFEg8r2DZcqjAkQG368+bB7xUZXxbzIOo4/XXonXNv8H/GDgtFVHiyNewLY+hzm0 mEcb8+f3ahXUv4WbykEx66HcZbsJ51+ZnOkJtyNbKzsASUru5K1l4snAoewjcITMXEgO u3YHq+Wu7isV65gVdsrwUr6akusatrm77HH4/1h8I5LWgDub99aC9UJvYVdcjjor17GL WA== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by aserp2130.oracle.com with ESMTP id 360kg22vm8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 15 Jan 2021 00:33:14 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 10F0GErJ137495; Fri, 15 Jan 2021 00:33:14 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserp3030.oracle.com with ESMTP id 360kf2tnf5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 15 Jan 2021 00:33:14 +0000 Received: from abhmp0014.oracle.com (abhmp0014.oracle.com [141.146.116.20]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 10F0XCHX006621; Fri, 15 Jan 2021 00:33:12 GMT Received: from [10.39.240.226] (/10.39.240.226) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 14 Jan 2021 16:33:12 -0800 Subject: Re: [PATCH 15/21] x86/xen/pvh: Convert indirect jump to retpoline To: Josh Poimboeuf , x86@kernel.org Cc: linux-kernel@vger.kernel.org, Peter Zijlstra , Sami Tolvanen , Sedat Dilek , Kees Cook , Nick Desaulniers , clang-built-linux@googlegroups.com, Miroslav Benes , Juergen Gross References: From: boris.ostrovsky@oracle.com Organization: Oracle Corporation Message-ID: Date: Thu, 14 Jan 2021 19:33:10 -0500 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.6.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9864 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 bulkscore=0 malwarescore=0 suspectscore=0 adultscore=0 spamscore=0 mlxlogscore=999 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101150000 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9864 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 suspectscore=0 clxscore=1015 impostorscore=0 spamscore=0 priorityscore=1501 mlxscore=0 phishscore=0 mlxlogscore=999 bulkscore=0 adultscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101150000 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 1/14/21 2:40 PM, Josh Poimboeuf wrote: > It's kernel policy to not have (unannotated) indirect jumps because of > Spectre v2. This one's probably harmless, but better safe than sorry. > Convert it to a retpoline. > > Cc: Boris Ostrovsky > Cc: Juergen Gross > Signed-off-by: Josh Poimboeuf Reviewed-by: Boris Ostrovsky