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Re: [PATCH v2 00/14] meson: Deprecate 32-bit host support
- To: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Richard Henderson <richard.henderson@xxxxxxxxxx>
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Tue, 4 Feb 2025 09:19:01 +0100
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- Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>, qemu-devel@xxxxxxxxxx, mark.cave-ayland@xxxxxxxxxxxx, berrange@xxxxxxxxxx, philmd@xxxxxxxxxx, thuth@xxxxxxxxxx, andrew.cooper3@xxxxxxxxxx, anthony.perard@xxxxxxxxxx, michal.orzel@xxxxxxx, jbeulich@xxxxxxxx, julien@xxxxxxx, roger.pau@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, bertrand.marquis@xxxxxxx
- Delivery-date: Tue, 04 Feb 2025 08:19:21 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 03.02.25 23:43, 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@xxxxxxxxxx
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.
As dom0 on x86 is a PV guest per default and Linux doesn't support running as a
32-bit PV guest since a few years now, I guess there is no need to support qemu
as 32-bit on x86 for Xen.
Juergen
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