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Fri, 31 Jan 2025 08:46:35 -0800 (PST) Received: from [192.168.163.227] ([50.233.235.3]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2f848aa0874sm3870306a91.32.2025.01.31.08.46.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 31 Jan 2025 08:46:35 -0800 (PST) Message-ID: <62449bfd-eb65-41d6-ae53-0333bcb603b3@linaro.org> Date: Fri, 31 Jan 2025 08:46:32 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/1] meson: Deprecate 32-bit host systems To: Paolo Bonzini , Peter Maydell , Thomas Huth Cc: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= , =?UTF-8?Q?Daniel_P=2E_Berrang=C3=A9?= , =?UTF-8?Q?Alex_Benn=C3=A9e?= , qemu-devel@nongnu.org, stefanha@redhat.com, mark.cave-ayland@ilande.co.uk, Liviu Ionescu References: <20250128004254.33442-1-richard.henderson@linaro.org> <9a280789-9248-4eca-b50c-048fc58e3f53@redhat.com> <87plk72tvr.fsf@draig.linaro.org> <8c0eea44-d0bf-4b86-9b1b-1c2082ab2df9@linaro.org> <9bf6d4b0-7a89-4110-a1e1-46bbdb2fc793@linaro.org> <8a54600c-ff3f-42dd-b164-62a57de867df@redhat.com> Content-Language: en-US From: Richard Henderson In-Reply-To: <8a54600c-ff3f-42dd-b164-62a57de867df@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::62b; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x62b.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, 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 1/29/25 04:47, Paolo Bonzini wrote: > The difference with TCG of course is that TCG is in active development, and therefore its > 32-bit host support is not surviving passively in the same way that a random device is. > Still, I think we can identify at least three different parts that should be treated > differently: 64-on-32, 32-on-32 system-mode emulation and 32-on-32 user-mode emulation. Why the user/system split for 32-on-32? > We could and should remove 64-on-32, maybe even without a deprecation period, but the rest > I'm not so sure.  I don't know enough to understand their maintenance cost (other than the > mere existence of the 32-bit TCG backends), but it's certainly not comparable to 64-on-32. Ok, lemme see how easy it is to prohibit configuring 64-on-32. But I also think we should still deprecate 32-bit hosts, sooner rather than later. Even if we have no immediate plans to remove them. I think we want interested parties to speak up. At some point this decade I want to be able to say: we've given you fair warning and time is up. r~