Re: [Xen-devel] [PATCH v2 16/25] x86/pv: Use per-domain policy information in pv_cpuid()

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 12/01/17 20:46, Boris Ostrovsky wrote:
> On 01/12/2017 02:27 PM, Andrew Cooper wrote:
>> On 12/01/17 18:00, Boris Ostrovsky wrote:
>>>> Ahh! found it.  This is a side effect of starting to generate the dom0
>>>> policy in Xen.
>>>>
>>>> Can you try this patch?
>>> Intel/AMD HVM/PV 64/32bit all look good. So
>>>
>>> Tested-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
>> Does this mean that newer versions of Linux more picky about what they
>> tolerate in cpuid?
> We started to fail after change in Xen so I am not sure it's something
> new in Linux.

Right, but Linux 4.4 was entirely happy with this bug, both with and
without having CPUID faulting imposed on it.

Either way, it is definitely a bug in my code.

~Andrew

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