Re: [PATCH for-4.16] x86/cpuid: do not shrink number of leaves in max policies

[Andrew Cooper <amc96@xxxxxxxx>]

On 24/11/2021 19:01, Ian Jackson wrote:
> Andrew Cooper writes ("Re: [PATCH for-4.16] x86/cpuid: do not shrink number 
> of leaves in max policies"):
>> It may revert cleanly, but it won't build because of the first hunk in
>> 81da2b544cbb00.  That hunk needs reverting too, because it too breaks
>> some cpuid= settings in VM config files.
> Would you be able to prepare the two-patch series (?) that does the
> necessary reverts ?

I'd do it as a single patch, but I can try to prepare one.

>> In principle, the *final* thing the toolstack should do, *for brand new
>> VMs only*, is a shrink of that form, but this depends on whole load more
>> toolstack work before it can be done safely.  There is a plan to fix
>> CPUID handling, in a safe way, and it is ongoing (subject to all the
>> security interruptions), but has a long way to go yet.
> For clarity: I think you are discussing future aspirations, which do
> not concern us for 4.16.

Correct.

~Andrew