Include QEMU 2.6.1 stable into Ubuntu 16.10

[bugproxy]

QEMU 2.6.1 has important fixes for Power, such as:

d917e88d85a147a99f38a62a4f95cac21e366d51 vfio: Fix broken EEH

Hence, we would like to request QEMU in Ubuntu 16.10 to use the latest stable version available, which is currently QEMU 2.6.1.

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2.6.1 is full of bugfixes only, mostly one liners. I don't see any new features, or compat breaks.

[Serge Hallyn (serge-hallyn)]

The intent is to update qemu as soon as it hits debian.

[bugproxy (bugproxy)]

------- Comment From <email address hidden> 2016-09-06 10:50 EDT-------
Serge,

It seems that qemu 2.6.1 will not make 16.10. If that is try, can Canonical cherry pick this patch then?

Thanks

[Nish Aravamudan (nacc)]

Hi Breno,

So 2.6.1 seems unlikely to make it in at this point, given that Debian has not updated yet.

Is the only patch needed d917e88d85a147a99f38a62a4f95cac21e366d51? Can you provide a description of the bug it fixes?

[Breno Leitão (breno-leitao)]

Hi Nish,

I understand that the major issue is this only patch. Leonardo can confirm here.
This patch fixes a QEMU bug. The backend vfio_eeh_container_op() communicates with host kernel for all EEH operations including retrieving PE's state. The function returns 0 (normal state) unconditionally when retrieving PE's state. That's why the frozen PE can't be detected by guest kernel.

Since this is an EEH issue, this is very POWER specific.

[Dimitri John Ledkov (xnox)]

I dunno, I'd try for 2.6.1 to be included, it has so many good things in it for POWER and for s390x.

[Dimitri John Ledkov (xnox)]

In landing PPA https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/landing-1931/+packages

[bugproxy (bugproxy)]

------- Comment From <email address hidden> 2016-09-10 21:07 EDT-------
(In reply to comment #7)
> Hi Nish,
>
> I understand that the major issue is this only patch. Leonardo can confirm
> here.

Yes, this patch is definitely required because it fixes an important bug fix for the EEH feature. Without it EEH would be broken.

However, if possible, I would like to have 2.6.1 in Ubuntu 16.10. It is a bug fix only release on top of 2.6. Releasing 2.6 instead of 2.6.1 means a user is getting something with lots of known issues already fixed by the community.

[Steve Langasek (vorlon)]

Since this is a bugfix-only release, no FFe is required. Please make sure you test it rigorously.

[Launchpad Janitor (janitor)]

This bug was fixed in the package qemu - 1:2.6.1+dfsg-0ubuntu1

---------------
qemu (1:2.6.1+dfsg-0ubuntu1) yakkety; urgency=medium

  * New upstream release. LP: #1617055.
  * Revert fix for CVE-2016-5403, causes regression see USN-3047-2.

 -- Dimitri John Ledkov <email address hidden> Fri, 09 Sep 2016 23:33:57 +0100