On 09/26/2017 11:14 AM, Yi Min Zhao wrote:
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 <borntrae...@de.ibm.com> wrote:
On 09/25/2017 12:07 PM, Cornelia Huck wrote:
On Fri, 22 Sep 2017 16:27:00 +0200
Halil Pasic <pa...@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
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.
In libvirt multibus is one of the few (very old) supports that would
allow checking against a qemu version.
Detection of zpci support is another matter since that capability is
tied to the existence of the zpci object in qom. Tying the zpci
capability to the multibus support has its pro and cons. I have not made
up my mind yet.
--
Mit freundlichen Grüßen/Kind regards
Boris Fiuczynski
IBM Deutschland Research & Development GmbH
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