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Subject: Re: [Qemu-devel] [PATCH 1/1] s390x: create a compat s390 phb for
 <=2.10
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To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>, David Hildenbrand <david@redhat.com>, Yi Min Zhao <zyimin@linux.vnet.ibm.com>, qemu-devel@nongnu.org, agraf@suse.de, pasic@linux.vnet.ibm.com, jjherne@linux.vnet.ibm.com

On Thu, 28 Sep 2017 14:17:54 +0200
Christian Borntraeger <borntraeger@de.ibm.com> wrote:

> I see no point if PCI disable machines. There is no non-PCI x86 machine
> besides the isapc. But this has no version whatsoever so it certainly
> is not made for being migrated.
> As far as I can see and we would make things much more complex.
> 
> non-PCI will trigger other issues. e.g. zpci and aen is part of the z14 cpu model
> since 2.10. Really this is not helping, its making things worse.  

What about creating the phb depending upon pci_available? Has no impact
for normal builds unless you muck around manually...

> If you really want to avoid PCI for whatever redhat is doing, can't you just hide
> it in a rhel specific machine (which you seem to have anyway for x86 and power)?

...but makes it easier to disable it correctly, if wanted.