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Re: [PATCH 1/2] docs/about: Deprecate 32-bit x86 hosts and qemu-system-i386



On 28/2/23 09:59, Michael S. Tsirkin wrote:
On Mon, Feb 27, 2023 at 10:21:14AM -1000, Richard Henderson wrote:
On 2/27/23 10:12, 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.

Removing support for building on 32 bit systems seems like a pity - it's
one of a small number of ways to run 64 bit binaries on 32 bit systems,
and the maintainance overhead is quite small.

It's not that small.  It only works for single-threaded system mode.  It
silently does not honor atomicity for user-only mode, which is perhaps worse
not working at all.

Will the same occur with 64-bit hosts when we introduce a 128-bit target? If so, there is no much code we'll be able to drop,

We should probably block multi-threading on 32 bit then.

so this sound a user experience fix.




 


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