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Tue, 4 Feb 2025 08:12:47 +0000 (UTC) Received: from redhat.com (unknown [10.42.28.60]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 394E019560BC; Tue, 4 Feb 2025 08:12:43 +0000 (UTC) Date: Tue, 4 Feb 2025 08:12:39 +0000 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Stefano Stabellini Cc: Richard Henderson , Paolo Bonzini , qemu-devel@nongnu.org, mark.cave-ayland@ilande.co.uk, philmd@linaro.org, thuth@redhat.com, andrew.cooper3@citrix.com, anthony.perard@vates.tech, michal.orzel@amd.com, jbeulich@suse.com, julien@xen.org, roger.pau@citrix.com, xen-devel@lists.xenproject.org, bertrand.marquis@arm.com Subject: Re: [PATCH v2 00/14] meson: Deprecate 32-bit host support Message-ID: References: <20250203031821.741477-1-richard.henderson@linaro.org> <467a5a58-952e-4930-8e91-744eda6d87d9@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/2.2.13 (2024-03-09) X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 Received-SPF: pass client-ip=170.10.129.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.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, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=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: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Mon, Feb 03, 2025 at 02:43:05PM -0800, Stefano Stabellini wrote: > +Xen maintainers > > > On Mon, 3 Feb 2025, Richard Henderson wrote: > > On 2/3/25 04:54, Paolo Bonzini wrote: > > > On 2/3/25 04:18, Richard Henderson wrote: > > > > v1: 20250128004254.33442-1-richard.henderson@linaro.org > > > > > > > > For v2, immediately disable 64-on-32 TCG. > > > > > > > > I *suspect* that we should disable 64-on-32 for *all* accelerators. > > > > The idea that an i686 binary on an x86_64 host may be used to spawn > > > > an x86_64 guest via kvm is silly and a bit more than niche. > > > > > > At least Xen used to be commonly used with 32-bit dom0, because it saved > > > memory and dom0 would map in guest buffers as needed.  I'm not sure how > > > common that is these days, perhaps Stefano knows. > > > > As a data-point, debian does not ship libxen-dev for i686. > > We cannot build-test this configuration at all. > > > > I can build-test Xen for armhf, and I guess it would use i386-softmmu; it's > > unclear whether x86_64-softmmu and aarch64-softmmu are relevant or useful for > > an armhf host, or as an armhf binary running on an aarch64 host. > > > On the Xen side, there are two different use cases: x86 32-bit and ARM > 32-bit. > > For x86 32-bit, while it was a very important use case in the past, I > believe it is far less so now. I will let the x86 maintainers comment on > how important it is today. If the Xen project needs an excuse to justify stopping 32-bit host support, QEMU would be happy to act as the excuse :-) With regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|