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[109.43.178.179]) by smtp.gmail.com with ESMTPSA id h185-20020a376cc2000000b007069375e0f4sm7952788qkc.122.2023.01.30.04.22.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Jan 2023 04:22:25 -0800 (PST) Message-ID: Date: Mon, 30 Jan 2023 13:22:22 +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?= , Peter Maydell Cc: qemu-devel@nongnu.org, Stefan Hajnoczi , Richard Henderson , libvir-list@redhat.com, Paolo Bonzini , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , Reinoud Zandijk , Ryo ONODERA , Brad Smith , Stefan Weil References: <20230130114428.1297295-1-thuth@redhat.com> From: Thomas Huth Subject: Re: [RFC PATCH] docs/about/deprecated: Deprecate 32-bit host systems In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.129.124; 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=-0.09, 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 30/01/2023 13.01, Daniel P. Berrangé wrote: > On Mon, Jan 30, 2023 at 11:47:02AM +0000, Peter Maydell wrote: >> On Mon, 30 Jan 2023 at 11:44, Thomas Huth wrote: >>> >>> Testing 32-bit host OS support takes a lot of precious time during the QEMU >>> contiguous integration tests, and considering that many OS vendors stopped >>> shipping 32-bit variants of their OS distributions and most hardware from >>> the past >10 years is capable of 64-bit >> >> True for x86, not necessarily true for other architectures. >> Are you proposing to deprecate x86 32-bit, or all 32-bit? >> I'm not entirely sure about whether we're yet at a point where >> I'd want to deprecate-and-drop 32-bit arm host support. Even mobile phones have 64-bit processors nowadays, Rasberry PIs are 64-bit nowadays ... which arm hosts scenarios are still limited to 32-bit ? Also, as far as I know, 32-bit KVM arm support has been removed from the Linux kernel a while ago already, so it's just about TCG now ... is there really still that much interest in running emulation on a non-beefy 32-bit host? Anyway, we could add the deprecation notice now to find out if there are still 32-bit users out there who will then start complaining about this. > Do we have a feeling on which aspects of 32-bit cause us the support > burden ? The boring stuff like compiler errors from mismatched integer > sizes is mostly quick & easy to detect simply through a cross compile. The burden are the CI minutes of the shared CI runners. We've got quite a bunch of 32-bit jobs in the CI: - cross-armel-system - cross-armel-user - cross-armhf-system - cross-armhf-user - cross-i386-system - cross-i386-user - cross-i386-tci - cross-mipsel-system - cross-mipsel-user - cross-win32-system If we could finally drop supporting 32-bit hosts, that would help with our CI minutes problem quite a lot, I think. Thomas