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[46.114.145.4]) by smtp.gmail.com with ESMTPSA id e8sm12952500wrj.48.2021.09.15.00.42.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 15 Sep 2021 00:42:51 -0700 (PDT) To: Richard Henderson , Peter Maydell , Joel Stanley References: <20210913161304.3805652-1-clg@kaod.org> <20210913161304.3805652-15-clg@kaod.org> <88c26520-6b87-e7a2-ac78-c1c92477c814@kaod.org> <1949e204-1bce-f15b-553b-1b42b41e3e08@linaro.org> From: Thomas Huth Subject: Deprecate 32-bit hosts? (was: Re: [PULL 14/14] hw/arm/aspeed: Add Fuji machine type) Message-ID: Date: Wed, 15 Sep 2021 09:42:48 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: <1949e204-1bce-f15b-553b-1b42b41e3e08@linaro.org> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=thuth@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US 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: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.398, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Daniel P. Berrange" , Samuel Thibault , Andrew Jeffery , "qemu-devel@nongnu.org" , "qemu-arm@nongnu.org" , =?UTF-8?Q?C=c3=a9dric_Le_Goater?= , Peter Delevoryas , Paolo Bonzini , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 14/09/2021 17.22, Richard Henderson wrote: > On 9/14/21 5:26 AM, Peter Maydell wrote: >> (2) RAM blocks should have a length that fits inside a >>      signed 32-bit type on 32-bit hosts (at least I assume this >>      is where the 2047MB limit is coming from; in theory this ought >>      to be improveable but auditing the code for mishandling of >>      RAMblock sizes to ensure we weren't accidentally stuffing >>      their size into a signed 'long' somewhere would be kind >>      of painful) > > Recalling that the win64 abi model is p64, i.e. 'long' is still 32-bit while > pointers are 64-bit, how close do we think we are to this being fixed already? > >> Even if we did fix (2) we'd need to compromise on (3) >> sometimes still -- if a board has 4GB of RAM that's >> not going to fit in 32 bits regardless. But we would be >> able to let boards with 2GB have 2GB. > > I'm not opposed to deprecating 32-bit hosts...  ;-) I think we should consider this again, indeed. Plain 32-bit CPUs are quite seldom these days, aren't they? And I think we urgently need to decrease the amount of things that we have to test and maintain in our CI and developer branches... So is there still a really really compelling reason to keep 32-bit host support alive? Could we maybe also decrease the amount of targets, i.e. merge qemu-system-x86_64 and qemu-system-i386, merge qemu-system-ppc64 and qemu-system-ppc, etc. where it makes sense (i.e. where one of the binaries is a superset of the other)? Thomas