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Re: Help with Understanding vcpu xstate restore error during vm migration
- To: Fonyuy-Asheri Caleb <fonyuy-asheri.caleb@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 6 Aug 2024 11:00:00 +0200
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- Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Delivery-date: Tue, 06 Aug 2024 09:00:12 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06.08.2024 09:34, Fonyuy-Asheri Caleb wrote:
>> If what you say in the earlier paragraph was the case with upstream Xen and
>> without you restricting what the guest being migrated was able to see on the
>> source host, then I think that would indicate a bug somewhere. Yet you don't
>> provide enough details to be certain.
>
> Sorry for not specifying. I am still in the same context as stated
> previously.
> I haven't made any modifications to xen and no restrictions on what the guest
> can see.
Wasn't it the case that previously you observed AVX disabled, because of
GDS? With AVX disabled, AVX512 would be implicitly disabled, too. Then
migrating from an AVX512-capable host to an AVX512-incapable one would
of course work. Yet of course this is only an example, because I don't
know whether AVX512 is what your new inquiry would have been about. As
indicated - please provide sufficient detail so we actually know what
you're doing and what you observe.
Jan
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