[Bug 1710019] Re: support GICv3 ITS save/restore & migration

[dann frazier]

On Fri, Nov 24, 2017 at 4:51 AM, ChristianEhrhardt
<1710019 at bugs.launchpad.net> wrote:
> Hi Dann,
> maybe it was good to hold off on this.
> It seems it causes a regression on arm, see bug 1734326.
> Also by holding for an arbitrary amount of time it might block the SRU queue for something else.

Sorry for the late reply - holidays, and behind on e-mail :(

> If you agree I'd ask you to let the SRU team cancel the upload from
proposed.

I agree. I think it is best to scrap the zesty backport at this point.
I will request the reject.

> And you can then take time to:
> a) continue with the kernel Team discussions
> b) analyze how bug 1734326 would be related and how to fix it
>
> If you do so I'd immediately do a revert in the qemu git so that the
> next SRU doesn't push the same by accident.
>
> @Coreycb - if done that way you likely want to cancel ocata proposed as
> well.

+1 cancelling the current ocata-proposed QEMU.

I'll make a todo to investigate LP: #1734326 to see if it can be
easily resolved and, if so, possibly request that we carry these
patches as a diff in the ocata cloud archive.

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https://bugs.launchpad.net/bugs/1710019

Title:
  support GICv3 ITS save/restore & migration

Status in Ubuntu Cloud Archive:
  Invalid
Status in Ubuntu Cloud Archive ocata series:
  Fix Committed
Status in Ubuntu Cloud Archive pike series:
  Fix Released
Status in linux package in Ubuntu:
  In Progress
Status in qemu package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Won't Fix
Status in qemu source package in Xenial:
  Won't Fix
Status in linux source package in Zesty:
  In Progress
Status in qemu source package in Zesty:
  Fix Committed
Status in linux source package in Artful:
  Fix Committed
Status in qemu source package in Artful:
  Fix Released

Bug description:
  [Impact]
  Virtual machines on GICv3-based ARM systems cannot be saved/restored or migrated.
  This feature was added in QEMU 2.10.

  [Test Case]
  ubuntu at grotrian:~$ sudo virsh save 7936-0 7936-0.sav

  Domain 7936-0 saved to 7936-0.sav

  ubuntu at grotrian:~$ sudo virsh restore 7396-0.sav
  error: Failed to restore domain from 7396-0.sav
  error: operation failed: job: unexpectedly failed

  ubuntu at grotrian:~$ sudo tail -3 /var/log/libvirt/qemu/7936-0.log
  2017-08-10T21:26:38.217427Z qemu-system-aarch64: State blocked by non-migratable device 'arm_gicv3_its'
  2017-08-10T21:26:38.217565Z qemu-system-aarch64: load of migration failed: Invalid argument
  2017-08-10 21:26:38.217+0000: shutting down, reason=failed

  [Regression Risk]
  The kernel changes are restricted to ARM, minimizing the regression risk on other architectures. Other than one minor offset adjustment, all patches are clean cherry-picks from upstream. Tested on Cavium ThunderX and Qualcomm Centriq.

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