Re: [Xen-devel] [XTF PATCH 02/16] vvmx: test whether MSR_IA32_FEATURE_CONTROL is set correctly

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 19/12/16 02:20, Haozhong Zhang wrote:
> On 12/16/16 16:17 +0000, Andrew Cooper wrote:
>> If so, I don't expect Xen's behaviour to ever change.  We'd prefer to do
>> all configuration like that at the toolstack/hypervisor level, rather
>> than the in-guest firmware (if any).
>>
>
> OK, then TODO is not necessary at all. My concern was that Intel SDM
> says MSR_IA32_FEATURE_CONTROL is cleared to zero when a logical
> processor is reset that is not consistent to what Xen currently
> presents in HVM domains.

The firmware line is somewhat blurred in virtualisation.

Even with reset, I'd still expect Xen to handle this part of the state,
in accordance with the toolstack settings.

~Andrew

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