Re: [Xen-devel] [PATCH 21/27] x86/cpuid: Calculate appropriate max_leaf values for the global policies

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 05.01.17 at 15:13, <andrew.cooper3@xxxxxxxxxx> wrote:
> On 05/01/17 13:43, Jan Beulich wrote:
>>>>> On 04.01.17 at 13:39, <andrew.cooper3@xxxxxxxxxx> wrote:
>>> --- a/xen/include/asm-x86/cpuid.h
>>> +++ b/xen/include/asm-x86/cpuid.h
>>> @@ -78,10 +78,10 @@ struct cpuid_policy
>>>       * Global *_policy objects:
>>>       *
>>>       * - Host accurate:
>>> -     *   - max_{,sub}leaf
>>>       *   - {xcr0,xss}_{high,low}
>>>       *
>>>       * - Guest appropriate:
>>> +     *   - max_{,sub}leaf
>>>       *   - All FEATURESET_* words
>> I can see the point of the addition, but why the removal?
> 
> Because the max_{,sub}leaf fields are no longer host-accurate.  They are
> min(host, tolerated policy).

Oh, I see.

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>


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