From: Christophe Fergeau <cfergeau@redhat.com>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: Mark Brown <broonie@kernel.org>, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v10 09/39] arm64/sme: Basic enumeration support
Date: Tue, 15 Nov 2022 10:10:18 +0100 [thread overview]
Message-ID: <CAJ4NJffySexZtVqX9e0T6DuWPno3fsogs-+G3GKxL32eYhVjnw@mail.gmail.com> (raw)
In-Reply-To: <Y3JL7d7wRgntbR9Y@arm.com>
Hey,
пн, 14 нояб. 2022 г. в 15:18, Catalin Marinas <catalin.marinas@arm.com>:
>
> On Wed, Nov 09, 2022 at 04:24:21PM +0100, Christophe Fergeau wrote:
> > ср, 9 нояб. 2022 г. в 14:32, Mark Brown <broonie@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.
>
> It's good that at least macOS 13 fixed it.
>
> I'm not even sure how we could work around this in the kernel. There's
> no meaningful MIDR to probe, nor do we know which macOS version it is
> running on. The best we could do is put some #ifdef CONFIG_ARM64_SME
> around the ID_AA64SMFR0_EL1 access but defconfig and most distros would
> probably have the option on anyway.
Yeah, a #ifdef would not work for me as CONFIG_ARM64_SME is set in
fedora kernel. If I decide to rebuild my own kernel for use on the M1
(which I am not planning to do), I can patch this anyway. Ideally it
would be possible to disable this from the kernel command line, but I
don't think that's possible :)
I guess the best I can do is to push my users to upgrade to macOS 13.
Thanks,
Christophe
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next prev parent reply other threads:[~2022-11-15 9:11 UTC|newest]
Thread overview: 127+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-26 15:27 [PATCH v10 00/39] arm64/sme: Initial support for the Scalable Matrix Extension Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 01/39] arm64: Define CPACR_EL1_FPEN similarly to other floating point controls Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 02/39] arm64: Always use individual bits in CPACR floating point enables Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 03/39] arm64: cpufeature: Always specify and use a field width for capabilities Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 04/39] kselftest/arm64: Remove local ARRAY_SIZE() definitions Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 05/39] arm64/sme: Provide ABI documentation for SME Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 06/39] arm64/sme: System register and exception syndrome definitions Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 07/39] arm64/sme: Manually encode SME instructions Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 08/39] arm64/sme: Early CPU setup for SME Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 09/39] arm64/sme: Basic enumeration support Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-11-08 16:30 ` Christophe Fergeau
2022-11-09 13:32 ` Mark Brown
2022-11-09 15:24 ` Christophe Fergeau
2022-11-09 15:52 ` Mark Brown
2022-11-14 14:08 ` Catalin Marinas
2022-11-15 9:10 ` Christophe Fergeau [this message]
2022-11-15 10:42 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 10/39] arm64/sme: Identify supported SME vector lengths at boot Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 11/39] arm64/sme: Implement sysctl to set the default vector length Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 12/39] arm64/sme: Implement vector length configuration prctl()s Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 13/39] arm64/sme: Implement support for TPIDR2 Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 14/39] arm64/sme: Implement SVCR context switching Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 15/39] arm64/sme: Implement streaming SVE " Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 16/39] arm64/sme: Implement ZA " Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 17/39] arm64/sme: Implement traps and syscall handling for SME Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 18/39] arm64/sme: Disable ZA and streaming mode when handling signals Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 19/39] arm64/sme: Implement streaming SVE signal handling Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 20/39] arm64/sme: Implement ZA " Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 21/39] arm64/sme: Implement ptrace support for streaming mode SVE registers Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 22/39] arm64/sme: Add ptrace support for ZA Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 23/39] arm64/sme: Disable streaming mode and ZA when flushing CPU state Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 24/39] arm64/sme: Save and restore streaming mode over EFI runtime calls Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 25/39] KVM: arm64: Hide SME system registers from guests Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 26/39] KVM: arm64: Trap SME usage in guest Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 27/39] KVM: arm64: Handle SME host state when running guests Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 28/39] arm64/sme: Provide Kconfig for SME Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 29/39] kselftest/arm64: sme: Add streaming SME support to vlset Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 30/39] kselftest/arm64: Add tests for TPIDR2 Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 31/39] kselftest/arm64: Extend vector configuration API tests to cover SME Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 32/39] kselftest/arm64: sme: Provide streaming mode SVE stress test Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 33/39] kselftest/arm64: signal: Allow tests to be incompatible with features Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 34/39] kselftest/arm64: signal: Handle ZA signal context in core code Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 35/39] kselftest/arm64: Add stress test for SME ZA context switching Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 36/39] kselftest/arm64: signal: Add SME signal handling tests Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 37/39] kselftest/arm64: Add streaming SVE to SVE ptrace tests Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 38/39] kselftest/arm64: Add coverage for the ZA ptrace interface Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` [PATCH v10 39/39] kselftest/arm64: Add SME support to syscall ABI test Mark Brown
2022-01-26 15:27 ` Mark Brown
2022-01-26 15:27 ` Mark Brown
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