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[109.43.176.203]) by smtp.gmail.com with ESMTPSA id p16-20020a05600c359000b003e209b45f6bsm6595277wmq.29.2023.03.03.03.22.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 03 Mar 2023 03:22:14 -0800 (PST) Message-ID: <2c7f837f-c156-8525-005f-f47d50591a85@redhat.com> Date: Fri, 3 Mar 2023 12:22:12 +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: John Paul Adrian Glaubitz , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , qemu-devel@nongnu.org, Peter Maydell , Daniel Berrange , Paolo Bonzini Cc: 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 , Michael Tokarev , Helge Deller , Laurent Vivier References: <20230302163106.465559-1-thuth@redhat.com> <4bed38c3-ab4f-cd32-05a4-afa090ad8b9a@linaro.org> <6c1f0d05-924e-854e-0175-5e345945e086@redhat.com> <89fd1c916b6c8094ea1a7a52396b3f91025c75c1.camel@physik.fu-berlin.de> From: Thomas Huth Subject: Re: [PATCH v2 0/6] Deprecate support for 32-bit x86 and arm hosts In-Reply-To: <89fd1c916b6c8094ea1a7a52396b3f91025c75c1.camel@physik.fu-berlin.de> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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=-0.092, 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 03/03/2023 12.09, John Paul Adrian Glaubitz wrote: > Hello! > > On Fri, 2023-03-03 at 10:48 +0100, Thomas Huth wrote: >> x86 ==> deprecate both, user and system emulation support on >> 32-bit hosts >> arm ==> deprecate only system emulation on 32-bit hosts. > > I would recommend against dropping support for 32-bit hosts for qemu-user > as there are some cases where the emulation of 32-bit user code on 64-bit > hosts does not work properly [1]. > > Adrian > >> [1] https://sourceware.org/bugzilla/show_bug.cgi?id=23960 The ticket is very long and hard to read, but ... oh my, does that mean you need to compile qemu-user in 32-bit mode on a 64-bit x86 host to properly run 32-bit binaries from other architectures? ... uh, that's ugly ... and sounds like bug in QEMU's user mode emulation ... and what if you're running a distro (or different 64-bit host architecutre) that does not support 32-bit userspace libraries anymore? Then you're lost? Thomas