linux-kernel - Re: [PATCH v9 21/22] KVM: s390: CPU model support for AP virtualization

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Message-ID: <20180823102447.05430368.cohuck@redhat.com>
Date:   Thu, 23 Aug 2018 10:24:47 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     Tony Krowiak <akrowiak@...ux.ibm.com>,
        Tony Krowiak <akrowiak@...ux.vnet.ibm.com>,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, freude@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, borntraeger@...ibm.com,
        kwankhede@...dia.com, bjsdjshi@...ux.vnet.ibm.com,
        pbonzini@...hat.com, alex.williamson@...hat.com,
        pmorel@...ux.vnet.ibm.com, alifm@...ux.vnet.ibm.com,
        mjrosato@...ux.vnet.ibm.com, jjherne@...ux.vnet.ibm.com,
        thuth@...hat.com, pasic@...ux.vnet.ibm.com, berrange@...hat.com,
        fiuczy@...ux.vnet.ibm.com, buendgen@...ibm.com,
        frankja@...ux.ibm.com
Subject: Re: [PATCH v9 21/22] KVM: s390: CPU model support for AP
 virtualization

On Thu, 23 Aug 2018 09:48:48 +0200
David Hildenbrand <david@...hat.com> wrote:

> > Migration of AP devices is not supported by this patch series, so this 
> > should
> > not be an issue.  
> 
> Might not be a problem now, but could be later. As I said in a different
> reply, the CPU model in QEMU does not care about KVM.
> 
> I want the QEMU CPU model and the KVM interfaces to be clean and future
> proof. That's why my opinion is to handle PQAP(QCI) just like all the
> other "feature blocks" we already have.

+1 to that sentiment.

It's better to try to get this correct now than having to hack around
should we want to implement things in the future.