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[109.43.177.75]) by smtp.gmail.com with ESMTPSA id u17-20020adff891000000b002c553e061fdsm8954445wrp.112.2023.02.27.23.43.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 27 Feb 2023 23:43:48 -0800 (PST) Message-ID: <2979548a-59f9-744f-70a7-d0fd00be0a2a@redhat.com> Date: Tue, 28 Feb 2023 08:43:46 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.13.0 Subject: Re: [PATCH 1/2] docs/about: Deprecate 32-bit x86 hosts and qemu-system-i386 Content-Language: en-US To: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , "Michael S. Tsirkin" , =?UTF-8?Q?Daniel_P=2e_Berrang=c3=a9?= Cc: qemu-devel@nongnu.org, Peter Maydell , Paolo Bonzini , Markus Armbruster , =?UTF-8?Q?Alex_Benn=c3=a9e?= , qemu-arm@nongnu.org, Maxim Levitsky , libvir-list@redhat.com, Richard Henderson , xen-devel@lists.xenproject.org, Reinoud Zandijk , Marcel Apfelbaum References: <20230227111050.54083-1-thuth@redhat.com> <20230227111050.54083-2-thuth@redhat.com> <20230227150858-mutt-send-email-mst@kernel.org> <77b8545c-4f2a-b389-2811-47d2d48940d9@linaro.org> From: Thomas Huth In-Reply-To: <77b8545c-4f2a-b389-2811-47d2d48940d9@linaro.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.129.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.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, 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=-0.089, RCVD_IN_DNSWL_NONE=-0.0001, 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: 2.1.29 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 27/02/2023 23.32, Philippe Mathieu-Daudé wrote: > On 27/2/23 21:12, Michael S. Tsirkin wrote: >> On Mon, Feb 27, 2023 at 11:50:07AM +0000, Daniel P. Berrangé wrote: >>> I feel like we should have separate deprecation entries for the >>> i686 host support, and for qemu-system-i386 emulator binary, as >>> although they're related they are independant features with >>> differing impact. eg removing qemu-system-i386 affects all >>> host architectures, not merely 32-bit x86 host, so I think we >>> can explain the impact more clearly if we separate them. >> >> Removing qemu-system-i386 seems ok to me - I think qemu-system-x86_64 is >> a superset. > > Doesn't qemu-system-i386 start the CPU in a different mode that > qemu-system-x86_64? Last time we discussed it, we mention adding > -32 and -64 CLI flags to maintain compat, and IIRC this flag would > add boot code to switch the CPU in 32-b. But then maybe I misunderstood. > Thomas said, "CPUs must start in the same mode they start in HW". No, I think you misunderstood something here. x86 CPUs always start in 16-bit mode, as far as I know, and the firmware / OS then has to switch to 32-bit or 64-bit mode as desired. Thomas