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Re: [PATCH v1 0/2] s390x/cpumodel: Introduce "best" model variants

From: Peter Maydell
Subject: Re: [PATCH v1 0/2] s390x/cpumodel: Introduce "best" model variants
Date: Fri, 8 Nov 2019 11:10:55 +0000

On Fri, 8 Nov 2019 at 11:08, David Hildenbrand <address@hidden> wrote:
> There was recently a discussion regarding CPU model versions. That concept
> does not fit s390x where we have a lot of feature variability. I
> proposed an alternative approach in [1], which might work for x86 as well
> (but I am not sure if x86 still can or wants to switch to that), and
> requires no real changes in upper layers.
> [1] and patch #2 contains more information on the motivation for this.
> E.g., specifying/expanding "z14-best" will result in the "best feature
> set possible on this accelerator, hw and, firmware". While a "z13" does
> not work under TCG and some z/VM versions, "z13-best" will work.

I think other architectures call this concept "max", not "best".
If we can manage some cross-architecture consistency that would
be helpful, but is s390x using 'max' already for something else?

-- PMM

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