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


From: Yi Min Zhao
Subject: Re: [Qemu-devel] [PATCH/RFC 2/3] s390x/ais: enable ais when migration is available
Date: Tue, 26 Sep 2017 17:14:02 +0800
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.3.0



在 2017/9/25 下午7:47, Christian Borntraeger 写道:
On 09/25/2017 01:45 PM, Cornelia Huck wrote:
On Mon, 25 Sep 2017 12:12:49 +0200
Christian Borntraeger <address@hidden> wrote:

On 09/25/2017 12:07 PM, Cornelia Huck wrote:
On Fri, 22 Sep 2017 16:27:00 +0200
Halil Pasic <address@hidden> 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
Make that zpci-per-se, no?

with KVM: host kernel >= 4.13 && QEMU >= 2.11
with TCG: tbd, I don't think anybody has time to wire this up for 2.11

Apropos libvirt: How will it determine whether zpci should be
supported? There are some old QEMU + KVM combinations out there that
will have a phb (but not be usable by stock Linux guests as the feature
bits are missing). Version fence? Check for cpu feature support?
I think for multibus or something like that Boris wanted to check for a version
anyway. So maybe 2.11 (now that 2.10 is broken regarding ais) as a minimum QEMU
level would make sense.


I think this makes sense. But I think I have to discuss this with Boris.




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