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Re: [Xen-devel] [PATCH v1 for 4.7] x86/cpuid: fix raw FEATURESET_7d0 reporting
- To: Jan Beulich <JBeulich@xxxxxxxx>, Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 15 May 2018 16:36:21 +0100
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- Cc: xen-devel@xxxxxxxxxxxxx
- Delivery-date: Tue, 15 May 2018 15:36:26 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 15/05/18 10:04, Jan Beulich wrote:
>>>> On 15.05.18 at 10:37, <sergey.dyasli@xxxxxxxxxx> wrote:
>> Commit 62b1879693e0 ("x86: further CPUID handling adjustments") added
>> FEATURESET_7d0 reporting but forgot to update calculate_raw_featureset()
>> function. As result, the value reported by xen-cpuid contains 0.
>>
>> Fix that by properly filling raw_featureset[FEATURESET_7d0].
>>
>> Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
> Thanks, technically
> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
>
>> ---
>> I see that at least 4.8 also contains this bug, so other releases also
>> need checking.
> The commit in question being only on the two branches, I think no other one
> would need the change.
>
> I'm certainly going to apply this to 4.8; I'm uncertain about 4.7 though
> <snip>
The entirety of that changeset is broken in feature levelling scenarios,
which is a consequence of missing this hunk which Sergey identified.
The result is that, when trying to level STIBP/IBPB out of guests view,
the CPUID bits remain visible, but attempts to use the MSR bits will fail.
I'm rewriting the change from scratch.
~Andrew
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