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Re: [PATCH v4] x86/xstate: enable AMX components
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 5 Sep 2024 14:49:03 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Matthew Barnes <matthew.barnes@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 05 Sep 2024 12:49:25 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 05.09.2024 14:21, Andrew Cooper wrote:
> On 05/09/2024 12:36 pm, Jan Beulich wrote:
>> These being controlled by XCR0, enabling support is relatively
>> straightforward. Note however that there won't be any use of them until
>> their dependent ISA extension CPUID flags are exposed, not the least due
>> to recalculate_xstate() handling the dependencies in kind of a reverse
>> manner.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Thanks.
> It might be worth noting that xstate_check_sizes() already probes AMX_TILE?
I've added a sentence.
> For future xstates, I'd expect matching updates to recalculate_xstate()
> and xstate_check_sizes().
Indeed that's how the somewhat similar APX patch has it that's yet to
be posted.
>> ---
>> Intended to replace part of (and go beyond) "x86/cpufeatures: Add new
>> cpuid features in SPR to featureset".
>
> Matt is OoO for a while. Given this interaction was the only concern,
> I'll probably rebase the feature patch and commit it.
Fine with me.
Jan
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