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[80.187.110.21]) by smtp.gmail.com with ESMTPSA id m2-20020adffe42000000b002c5d3f0f737sm2901428wrs.30.2023.02.17.11.49.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 17 Feb 2023 11:49:46 -0800 (PST) Message-ID: Date: Fri, 17 Feb 2023 20:49:43 +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: Paolo Bonzini , =?UTF-8?Q?Daniel_P=2e_Berrang=c3=a9?= , Markus Armbruster Cc: qemu-devel@nongnu.org, Peter Maydell , Stefan Hajnoczi , Richard Henderson , libvir-list@redhat.com, =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , Reinoud Zandijk , Ryo ONODERA , Brad Smith , Stefan Weil , Maxim Levitsky , Sean Christopherson References: <20230130114428.1297295-1-thuth@redhat.com> <87a61cbmti.fsf@pond.sub.org> 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=170.10.133.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.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, 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=-0.256, 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 17/02/2023 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. So if I got that right: https://lore.kernel.org/all/b8fa9561295bb6af2b7fcaa8125c6a3b89b305c7.camel@redhat.com/ ... the objection is mainly that some kernel developers want to keep the code around for easier testing of nested 32-bit guests L1 hypervisors. If that's the only use case that is still around for the 32-bit KVM x86 kernel code, I guess it should also be fine to use older versions of QEMU in those L1 hypervisor guests (assuming you have to use an older 32-bit Linux distro for this anyway). So unless I got that wrong, there is really nobody around anymore who needs an *upstream* QEMU for running 32-bit x86 KVM hosts, is there? Please correct me if I'm wrong, but I think we can really deprecated at least qemu-system-i386 and qemu-system-arm now, can't we? Thanks, Thomas