On Thu, 21 May 2026 15:51:26 +0100,
Mark Rutland <[email protected]> wrote:
>
> On Fri, Mar 06, 2026 at 05:01:11PM +0000, Mark Brown wrote:
> > Provide versions of the SME state save and restore functions for the
> > hypervisor to allow it to restore ZA and ZT for guests.
> >
> > Signed-off-by: Mark Brown <[email protected]>
> > ---
> > arch/arm64/include/asm/kvm_hyp.h | 2 ++
> > arch/arm64/kvm/hyp/fpsimd.S | 23 +++++++++++++++++++++++
> > 2 files changed, 25 insertions(+)
>
> While this specific instance is simple enough, I don't think we should
> continue to duplicate the low level save/restore routines between the
> main kernel and KVM hyp code.
>
> I've sent a series that avoids the need for this, and cleans up some
> other bits):
>
>
> https://lore.kernel.org/linux-arm-kernel/[email protected]/
>
> Assuming Marc and Oliver are on board, I'd prefer that we do that
> cleanup first, and build the KVM SME support atop.
Absolutely. The whole FP/SVE is still way too complicated, full of
esoteric constructs, hard to audit, and I would really like to see it
cleaned-up before stacking another layer on top.
I've quickly eyeballed the KVM-specific patches yesterday, and nothing
seem outlandish, so there is a good chance some of that could make it
into 7.2. I plan to look at it again shortly.
Thanks,
M.
--
Jazz isn't dead. It just smells funny.
