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[109.43.177.75]) by smtp.gmail.com with ESMTPSA id l16-20020a5d6690000000b002c559626a50sm8844011wru.13.2023.02.27.23.49.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 27 Feb 2023 23:49:10 -0800 (PST) Message-ID: <84d7d3e5-0da2-7506-44a7-047ebfcfc4da@redhat.com> Date: Tue, 28 Feb 2023 08:49:09 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.13.0 Subject: Re: [PATCH 1/2] docs/about: Deprecate 32-bit x86 hosts and qemu-system-i386 Content-Language: en-US To: "Michael S. Tsirkin" , =?UTF-8?Q?Daniel_P=2e_Berrang=c3=a9?= Cc: qemu-devel@nongnu.org, Peter Maydell , Paolo Bonzini , Markus Armbruster , =?UTF-8?Q?Alex_Benn=c3=a9e?= , qemu-arm@nongnu.org, Maxim Levitsky , libvir-list@redhat.com, Richard Henderson , xen-devel@lists.xenproject.org, Reinoud Zandijk , Marcel Apfelbaum References: <20230227111050.54083-1-thuth@redhat.com> <20230227111050.54083-2-thuth@redhat.com> <20230227150858-mutt-send-email-mst@kernel.org> From: Thomas Huth In-Reply-To: <20230227150858-mutt-send-email-mst@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.089, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 27/02/2023 21.12, Michael S. Tsirkin wrote: > On Mon, Feb 27, 2023 at 11:50:07AM +0000, Daniel P. Berrangé wrote: >> I feel like we should have separate deprecation entries for the >> i686 host support, and for qemu-system-i386 emulator binary, as >> although they're related they are independant features with >> differing impact. eg removing qemu-system-i386 affects all >> host architectures, not merely 32-bit x86 host, so I think we >> can explain the impact more clearly if we separate them. > > Removing qemu-system-i386 seems ok to me - I think qemu-system-x86_64 is > a superset. > > Removing support for building on 32 bit systems seems like a pity - it's > one of a small number of ways to run 64 bit binaries on 32 bit systems, > and the maintainance overhead is quite small. Note: We're talking about 32-bit *x86* hosts here. Do you really think that someone is still using QEMU usermode emulation to run 64-bit binaries on a 32-bit x86 host?? ... If so, I'd be very surprised! > In fact, keeping this support around forces correct use of > posix APIs such as e.g. PRIx64 which makes the code base > more future-proof. If you're concerned about PRIx64 and friends: We still continue to do compile testing with 32-bit MIPS cross-compilers and Windows 32-bit cross-compilers for now. The only thing we'd lose is the 32-bit "make check" run in the CI. Thomas