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[88.29.172.217]) by smtp.gmail.com with ESMTPSA id 7-20020a05600c028700b003e214803343sm5536482wmk.46.2023.02.17.09.43.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 17 Feb 2023 09:43:39 -0800 (PST) Message-ID: <72bd7694-9d37-1f9b-db4e-6d5818f7c55c@linaro.org> Date: Fri, 17 Feb 2023 18:43:36 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.8.0 Subject: Re: [RFC PATCH] docs/about/deprecated: Deprecate 32-bit host systems Content-Language: en-US To: Paolo Bonzini , =?UTF-8?Q?Daniel_P=2e_Berrang=c3=a9?= , Markus Armbruster Cc: Thomas Huth , qemu-devel@nongnu.org, Peter Maydell , Stefan Hajnoczi , Richard Henderson , libvir-list@redhat.com, Reinoud Zandijk , Ryo ONODERA , Brad Smith , Stefan Weil , Huacai Chen , Jiaxun Yang References: <20230130114428.1297295-1-thuth@redhat.com> <87a61cbmti.fsf@pond.sub.org> From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::32b; envelope-from=philmd@linaro.org; helo=mail-wm1-x32b.google.com X-Spam_score_int: -23 X-Spam_score: -2.4 X-Spam_bar: -- X-Spam_report: (-2.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.256, RCVD_IN_DNSWL_NONE=-0.0001, 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 (Cc'ing Huacai & Jiaxun). On 17/2/23 17:38, Paolo Bonzini wrote: > On 2/17/23 11:47, Daniel P. Berrangé wrote: >> On Fri, Feb 17, 2023 at 11:36:41AM +0100, Markus Armbruster wrote: >>> I feel the discussion petered out without a conclusion. >>> >>> I don't think letting the status quo win by inertia is a good outcome >>> here. >>> >>> Which 32-bit hosts are still useful, and why? >> >> Which 32-bit hosts does Linux still provide KVM  support for. > > All except ARM: MIPS, x86, PPC and RISC-V. > > I would like to remove x86, but encountered some objections. > > MIPS, nobody is really using it I think. 32-bit was added in 2014, commit 222e7d11e7 ("target-mips: Enable KVM support in build system"). I'm not aware of anybody using it (even testing it). I don't have hardware to test it (neither time). We are still cross-compiling it although. 64-bit support was added recently (see commit aa2953fd16 "configure: Add KVM target support for MIPS64") and is used (see commit fbc5884ce2 "meson.build: Re-enable KVM support for MIPS" from 2020), however I tend to see it more as hobbyist use than production one. Besides it is listed as 'Odd Fixes' in MAINTAINERS (still 2020, commit 134f7f7da1 "MAINTAINERS: Reactivate MIPS KVM CPUs"). > So that leaves PPC and RISC-V. > >> If any, is there an EOL date for Linux 32-bit KVM support ? > > No, and I don't think there's going to be one. > > Paolo >