[PATCH v10 09/39] arm64/sme: Basic enumeration support

[Christophe Fergeau]

Hey,

ср, 9 нояб. 2022 г. в 14:32, Mark Brown <broonie at kernel.org>:
>
> On Tue, Nov 08, 2022 at 05:30:01PM +0100, Christophe Fergeau wrote:
>
> > I've raised this issue with Apple as there's most likely a bug to fix in their
> > hypervisor, but I was wondering if this could also be worked around kernel-side?
> > Before this change, I've had no problems with my linux VMs.
>
> It should be *possible* to add quirks for this, but there was some
> sentiment against adding workarounds where the out of spec system could
> be fixed (unknown registers in the ID space are supposed to be read as
> zero).

I haven't heard back from Apple yet. I've tried macOS 13 though, the
latest macOS major version, and in this version, unpatched kernels
boot fine, so they probably fixed this out of spec behaviour. It's
only with macOS 12 that I'm hitting this read_cpuid() failure.
macOS 13 was released just a few weeks ago, I'm not sure how fast "my"
users will upgrade, nor if Apple will be willing to backport the fix
to macOS 12 :-/ Having a workaround for a while would definitely help.

Christophe