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[173.197.98.118]) by smtp.gmail.com with ESMTPSA id q21-20020a637515000000b004b1fef0bf16sm7329352pgc.73.2023.01.30.15.33.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Jan 2023 15:33:40 -0800 (PST) Message-ID: <8a802013-1bdf-8b56-d74c-0e3ee1c203ae@linaro.org> Date: Mon, 30 Jan 2023 13:33:36 -1000 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.2 Subject: Re: [RFC PATCH] docs/about/deprecated: Deprecate 32-bit host systems Content-Language: en-US To: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , =?UTF-8?Q?Daniel_P=2e_Berrang=c3=a9?= , Peter Maydell Cc: Thomas Huth , qemu-devel@nongnu.org, Stefan Hajnoczi , libvir-list@redhat.com, Paolo Bonzini , Reinoud Zandijk , Ryo ONODERA , Brad Smith , Stefan Weil , Michael Tokarev References: <20230130114428.1297295-1-thuth@redhat.com> <9c529b2a-14bd-fd50-c0d9-87f2253ee0bb@linaro.org> <51e135e0-0c94-43d6-c408-1a9d556e9e42@linaro.org> From: Richard Henderson In-Reply-To: <51e135e0-0c94-43d6-c408-1a9d556e9e42@linaro.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::1035; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x1035.google.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, 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, 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 1/30/23 13:14, Philippe Mathieu-Daudé wrote: > On 30/1/23 20:19, Richard Henderson wrote: > >> But I do question whether we need to support 64-bit guests on 32-bit hosts at all. >> Retaining 32-bit on 32-bit allows arm32 to emulate i686, which I suspect, but have no >> proof, is the limit of what users actually want. > > I presume you implicitly restrict that to user emulation, right? No, there's no specific reason to eliminate e.g. qemu-system-i386. or any other 32-bit guest. Though quite often such hardware doesn't really have enough ram to do a good job, that's not a technical argument against. > WRT i686, if your example is "i686 useremu on non-x86 embedde router" > then any 32-bit host is potentially interested, not only arm32. arm32 was merely an example -- the other 32-bit hosts are i686, mips, ppc. But we don't have many of them. > I remember being able to run armhf binaries on armel hosts (and vice > versa) was useful 7 years ago. Fair enough. > Today I have no clue, we could poll the community and some > distributions. Sure. r~