Re: [PATCH v2 2/2] s390x/cpumodel: Introduce dynamic feature groups

[Christian Borntraeger]

On 25.11.19 18:20, David Hildenbrand wrote:
> 
> As soon as dynamic feature groups are used, the CPU model becomes
> migration-unsafe. Upper layers can expand these models to migration-safe
> and static variants, allowing them to be migrated.

I really dislike that. I am trying to get rid of the unsafe variants (e.g. now
defaulting to host-model instead of host-passthrough). I do not want to give
users new ways of hurting themselves.

Unless I misunderstood Eduardo, I think his versioning approach is actually 
better
in regard to migration, no?
I z terms, you can still say -cpu z13  which is just an alias to z13v1 z13v2 
etc.
Assuming that the version is checked this will be safe.