Re: [Qemu-devel] [PATCH/RFC 2/3] s390x/ais: enable ais when migration is available

[Christian Borntraeger <borntraeger@de.ibm.com>]

On 09/25/2017 12:07 PM, Cornelia Huck wrote:
> On Fri, 22 Sep 2017 16:27:00 +0200
> Halil Pasic <pasic@linux.vnet.ibm.com> wrote:
> 
>> One thing I would find very helpful is what do we expect to work and not
>> work for which version. Kind of a matrix. For instance should vfio pci
>> work for versions prior 2.11. I think in the not so distant past we
>> changed how SIC works (so it complains when we don't have ais).
> 
> A matrix sounds like a good idea.

I think we do not even need a matrix, a minimum level will suffice because...
> 
> I don't think we really ever had a setup that worked out of the box

exactly: ...it never worked until 2.10 and we do not have libvirt support yet.
Now with the fix 2.10 will also not work, so I think its fair to say

PCI passthrough via VFIO will be supported for 
- KVM: host kernel >= 4.13
- TCG: TBD
- QEMU >= 2.11
- libvirt TBD


> for a Linux guest prior to 2.10 anyway. For added fun, it also depends
> on the host kernel. And tcg won't work at all due to the pci
> instruction not yet being wired up.
> 
>> Btw nimm/dimm is simm/nimm. And I would really like to hear something

yes, I mixed that up. Too many letters :-)

>> form the original author(s) too.