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Wed, 12 Oct 2022 12:54:17 -0400 X-MC-Unique: YWRLYSt9O42ciCepQ4HeNw-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 1A49E185A792; Wed, 12 Oct 2022 16:54:15 +0000 (UTC) Received: from oldenburg.str.redhat.com (unknown [10.39.192.47]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 8BB8640FF71C; Wed, 12 Oct 2022 16:54:07 +0000 (UTC) From: Florian Weimer To: Dave Hansen Cc: "Edgecombe, Rick P" , "bsingharora@gmail.com" , "hpa@zytor.com" , "Syromiatnikov, Eugene" , "peterz@infradead.org" , "rdunlap@infradead.org" , "keescook@chromium.org" , "Yu, Yu-cheng" , "dave.hansen@linux.intel.com" , "kirill.shutemov@linux.intel.com" , "Eranian, Stephane" , "linux-mm@kvack.org" , "nadav.amit@gmail.com" , "jannh@google.com" , "dethoma@microsoft.com" , "linux-arch@vger.kernel.org" , "kcc@google.com" , "bp@alien8.de" , "oleg@redhat.com" , "hjl.tools@gmail.com" , "Yang, Weijiang" , "Lutomirski, Andy" , "pavel@ucw.cz" , "arnd@arndb.de" , "Moreira, Joao" , "tglx@linutronix.de" , "mike.kravetz@oracle.com" , "x86@kernel.org" , "linux-doc@vger.kernel.org" , "jamorris@linux.microsoft.com" , "john.allen@amd.com" , "rppt@kernel.org" , "mingo@redhat.com" , "Shankar, Ravi V" , "corbet@lwn.net" , "linux-kernel@vger.kernel.org" , "linux-api@vger.kernel.org" , "gorcunov@gmail.com" Subject: Re: [PATCH v2 01/39] Documentation/x86: Add CET description References: <20220929222936.14584-1-rick.p.edgecombe@intel.com> <20220929222936.14584-2-rick.p.edgecombe@intel.com> <87ilkr27nv.fsf@oldenburg.str.redhat.com> <62481017bc02b35587dd520ed446a011641aa390.camel@intel.com> <87v8opz0me.fsf@oldenburg.str.redhat.com> Date: Wed, 12 Oct 2022 18:54:06 +0200 In-Reply-To: (Dave Hansen's message of "Wed, 12 Oct 2022 08:59:51 -0700") Message-ID: <87y1tlx9sh.fsf@oldenburg.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 ARC-Message-Signature: i=1; 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dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=YpohtWp4; spf=pass (imf18.hostedemail.com: domain of fweimer@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=fweimer@redhat.com; dmarc=pass (policy=none) header.from=redhat.com X-Stat-Signature: 54npfi5i3ho1xwd7xjjumgdpr1fxth6b X-Rspamd-Queue-Id: 28F561C0026 X-HE-Tag: 1665593661-861209 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: * Dave Hansen: > On 10/12/22 05:29, Florian Weimer wrote: >>> What did you think of the proposal to disable existing binaries and >>> start from scratch? Elaborated in the coverletter in the section >>> "Compatibility of Existing Binaries/Enabling Interface". >> The ABI was finalized around four years ago, and we have shipped several >> Fedora and Red Hat Enterprise Linux versions with it. Other >> distributions did as well. It's a bit late to make changes now, and >> certainly not for such trivialities. > > Just to be clear: You're saying that a user/kernel ABI was "finalized" > by glibc shipping the user side of it, before there being an upstream > kernel implementation? Sorry for being unclear. I was refering to the x86-64 ELF psABI supplement for CET, not the kernel/userspace interface, which still does not exist in its final form as of today, as far as I understand it. Thanks, Florian