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[109.43.177.75]) by smtp.gmail.com with ESMTPSA id q8-20020a1cf308000000b003e11ad0750csm11789964wmq.47.2023.02.27.23.39.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 27 Feb 2023 23:39:51 -0800 (PST) Message-ID: <001bedba-b12f-4dd8-0866-7ccb9ce877d0@redhat.com> Date: Tue, 28 Feb 2023 08:39:49 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.13.0 Content-Language: en-US To: =?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 , "Michael S . Tsirkin" , Marcel Apfelbaum References: <20230227111050.54083-1-thuth@redhat.com> From: Thomas Huth Subject: Re: [PATCH 0/2] Deprecate support for 32-bit x86 and arm hosts In-Reply-To: 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 19.38, Daniel P. Berrangé wrote: > On Mon, Feb 27, 2023 at 12:10:48PM +0100, Thomas Huth wrote: >> We're struggling quite badly with our CI minutes on the shared >> gitlab runners, so we urgently need to think of ways to cut down >> our supported build and target environments. qemu-system-i386 and >> qemu-system-arm are not really required anymore, since nobody uses >> KVM on the corresponding systems for production anymore, and the >> -x86_64 and -arch64 variants are a proper superset of those binaries. >> So it's time to deprecate them and the corresponding 32-bit host >> environments now. >> >> This is a follow-up patch series from the previous discussion here: >> >> https://lore.kernel.org/qemu-devel/20230130114428.1297295-1-thuth@redhat.com/ >> >> where people still mentioned that there is still interest in certain >> support for 32-bit host hardware. But as far as I could see, there is >> no real need for 32-bit host support for system emulation on x86 and >> arm anymore, so it should be fine if we drop these host environments >> now (these are also the two architectures that contribute the most to >> the long test times in our CI, so we would benefit a lot by dropping >> those). > > Your description here is a little ambiguous about what's being > proposed. When you say dropping 32-bit host support do you mean > just for the system emulator binaries, or for QEMU entirely ? Just for system emulation. Some people said that user emulation still might be useful for some 32-bit environments. > And when the deprecation period is passed, are you proposing > to actively prevent 32-bit builds, or merely stopping CI testing > and leave 32-bit builds still working if people want them ? CI is the main pain point, so that's the most important thing. So whether we throw a warning or a hard error while configuring the build, I don't care too much. Thomas