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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no 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 5A493C433DB for ; Tue, 16 Mar 2021 17:30:38 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id C11716511D for ; Tue, 16 Mar 2021 17:30:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C11716511D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=alien8.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 347C16B0036; Tue, 16 Mar 2021 13:30:37 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 31E156B006C; Tue, 16 Mar 2021 13:30:37 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1E6C86B006E; Tue, 16 Mar 2021 13:30:37 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0095.hostedemail.com [216.40.44.95]) by kanga.kvack.org (Postfix) with ESMTP id 029FB6B0036 for ; Tue, 16 Mar 2021 13:30:36 -0400 (EDT) Received: from smtpin27.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id AC2E9180AD83A for ; Tue, 16 Mar 2021 17:30:36 +0000 (UTC) X-FDA: 77926426872.27.905FF8E Received: from mail.skyhub.de (mail.skyhub.de [5.9.137.197]) by imf01.hostedemail.com (Postfix) with ESMTP id 57F4520053E8 for ; Tue, 16 Mar 2021 17:30:33 +0000 (UTC) Received: from zn.tnic (p200300ec2f0a1000f4cd07eb01fab5b0.dip0.t-ipconnect.de [IPv6:2003:ec:2f0a:1000:f4cd:7eb:1fa:b5b0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id AB1AB1EC056D; Tue, 16 Mar 2021 18:30:29 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1615915829; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=qwNDhXsjyn7zMbvTCUkh+TXYixcjEnNSV28bE8swi88=; b=MkV30Y+zUzz/ZA98kKKFFbNwFgIeusWLPCM1J1vgJbX1XA4KfvzxzSNOsac++vFQoLqcsy owH4CMBawgA60o18K9eCIOV4032LejlLVubpAfO311bhm/ANOSi2AXvA/7BgDz0ugvzBk/ S+aExBwBf4u3yNDxNaYa2grVYdb03sM= Date: Tue, 16 Mar 2021 18:30:32 +0100 From: Borislav Petkov To: "Yu, Yu-cheng" Cc: Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H.J. Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V. Shankar" , Vedvyas Shanbhogue , Dave Martin , Weijiang Yang , Pengfei Xu , Haitao Huang , Jarkko Sakkinen Subject: Re: [PATCH v23 6/9] x86/entry: Introduce ENDBR macro Message-ID: <20210316173032.GE18003@zn.tnic> References: <20210316151320.6123-1-yu-cheng.yu@intel.com> <20210316151320.6123-7-yu-cheng.yu@intel.com> <15966857-9be7-3029-7e93-e40596b4649a@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <15966857-9be7-3029-7e93-e40596b4649a@intel.com> X-Stat-Signature: psngjgqc7zgn6asik1s8eenm3kksaigs X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 57F4520053E8 Received-SPF: none (alien8.de>: No applicable sender policy available) receiver=imf01; identity=mailfrom; envelope-from=""; helo=mail.skyhub.de; client-ip=5.9.137.197 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1615915833-749193 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Mar 16, 2021 at 10:12:39AM -0700, Yu, Yu-cheng wrote: > Alternatively, there is another compiler-defined macro _CET_ENDBR that can > be used. We can put the following in calling.h: Not calling.h - this is apparently needed in vdso code only so I guess some header there, arch/x86/include/asm/vdso.h maybe? In the #else /* __ASSEMBLER__ */ branch maybe... > #ifdef __CET__ > #include > #else > #define _CET_ENDBR > #endif > > and then use _CET_ENDBR in other files. How is that? What does that macro do? Issue an ENDBR only? -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette