[PATCH] um: add back support for FXSAVE registers

[SeongJae Park]

On Tue,  7 Jan 2025 13:07:58 -0800 SeongJae Park <sj at kernel.org> wrote:

> Hello,
> 
> On Wed, 4 Dec 2024 08:48:27 +0100 Benjamin Berg <benjamin at sipsolutions.net> wrote:
> 
> > From: Benjamin Berg <benjamin.berg at intel.com>
> > 
> > It was reported that qemu may not enable the XSTATE CPU extension, which
> > is a requirement after commit 3f17fed21491 ("um: switch to regset API
> > and depend on XSTATE"). Add a fallback to use FXSAVE (FP registers on
> > x86_64 and XFP on i386) which is just a shorter version of the same
> > data. The only difference is that the XSTATE magic should not be set in
> > the signal frame.
> > 
> > Note that this still drops support for the older i386 FP register layout
> > as supporting this would require more backward compatibility to build a
> > correct signal frame.
> > 
> > Fixes: 3f17fed21491 ("um: switch to regset API and depend on XSTATE")
> > Reported-by: SeongJae Park <sj at kernel.org>
> > Closes: https://lore.kernel.org/r/20241203070218.240797-1-sj@kernel.org
> > Tested-by: SeongJae Park <sj at kernel.org>
> > Signed-off-by: Benjamin Berg <benjamin.berg at intel.com>
> 
> Seems this patch is not yet merged into uml/next or uml/fixes.  May I ask the
> timeline or blockers for this patch?

A gentle reminder. :)


Thanks,
SJ

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