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Re: [PATCH] x86/CPUID: don't shrink hypervisor leaves
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 18 Oct 2021 14:09:24 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Mon, 18 Oct 2021 12:09:36 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 18.10.2021 13:45, Roger Pau Monné wrote:
> On Fri, May 07, 2021 at 10:40:34AM +0200, Jan Beulich wrote:
>> This is a partial revert of 540d911c2813 ("x86/CPUID: shrink
>> max_{,sub}leaf fields according to actual leaf contents"). Andrew points
>> out that XXX.
>>
>> Reported-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>> ---
>> Obviously the XXX wants filling in. So far I did not really understand
>> what bad consequences there might be, but I can agree with the undoing
>> of this part of the original change along the lines of why the Viridian
>> side adjustment was also requested to be dropped (before the patch went
>> in).
>
> I have to admit I'm confused about this. Here the maximum leaf
> reported only changes between PV and HVM, but never as a result of the
> features exposed, which I think should be fine?
>
> Ie: I recall the problem being the maximum leaf possibly shrinking
> when migrating, but that's not the case.
I assume that's a question to Andrew? Because if I knew the answer,
I could probably have written a proper / complete description.
Jan
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