[Bug 1541902] Re: [FFe] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

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Title:
  [FFe] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu
  KVM

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[Bug 1541902] Re: [FFe] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

[Launchpad Bug Tracker]

This bug was fixed in the package qemu - 1:2.6.1+dfsg-0ubuntu2

---
qemu (1:2.6.1+dfsg-0ubuntu2) yakkety; urgency=medium

  * Enable GPU Passthru for ppc64le (LP: #1541902)
- 0001-spapr-ensure-device-trees-are-always-associated-with.patch
- 0002-spapr_pci-Use-correct-DMA-LIOBN-when-composing-the-d.patch
- 0003-spapr_iommu-Finish-renaming-vfio_accel-to-need_vfio.patch
- 0004-spapr_iommu-Move-table-allocation-to-helpers.patch
- 0005-vmstate-Define-VARRAY-with-VMS_ALLOC.patch
- 0006-spapr_iommu-Introduce-enabled-state-for-TCE-table.patch
- 0007-spapr_iommu-Migrate-full-state.patch
- 0008-spapr_iommu-Add-root-memory-region.patch
- 0009-spapr_pci-Reset-DMA-config-on-PHB-reset.patch
- 0010-spapr_pci-Add-and-export-DMA-resetting-helper.patch
- 0011-memory-Add-reporting-of-supported-page-sizes.patch
- 0012-memory-Add-MemoryRegionIOMMUOps.notify_started-stopp.patch
- 0013-intel_iommu-Throw-hw_error-on-notify_started.patch
- 0014-spapr_iommu-Realloc-guest-visible-TCE-table-when-sta.patch
- 0015-vfio-spapr-Add-DMA-memory-preregistering-SPAPR-IOMMU.patch
- 0016-vfio-Add-host-side-DMA-window-capabilities.patch
- 0017-vfio-spapr-Create-DMA-window-dynamically-SPAPR-IOMMU.patch
- 0018-spapr_pci-spapr_pci_vfio-Support-Dynamic-DMA-Windows.patch
- 0019-vfio-spapr-Remove-stale-ioctl-call.patch
- 0020-spapr-Fix-undefined-behaviour-in-spapr_tce_reset.patch
- 0021-memory-Fix-IOMMU-replay-base-address.patch

 -- Jon Grimm   Fri, 16 Sep 2016 14:14:47 -0500

** Changed in: qemu (Ubuntu)
   Status: In Progress => Fix Released

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[Bug 1541902] Re: [FFe] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

[Jon Grimm]

Rebased on new 2.6.1.

** Patch added: "qemu_2.6.1+dfsg-0ubuntu2.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1541902/+attachment/4742202/+files/qemu_2.6.1+dfsg-0ubuntu2.debdiff

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Title:
  [FFe] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu
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[Bug 1541902] Re: [FFe] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

[Jon Grimm]

On Hold. 2.6.1 seems to be having issues landing. Removed sponsors and
will likely have to rebase again.

** Patch removed: "qemu_2.6.1+dfsg-0ubuntu2.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1541902/+attachment/4742034/+files/qemu_2.6.1+dfsg-0ubuntu2.debdiff

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  [FFe] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu
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[Bug 1541902] Re: [FFe] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

[Jon Grimm]

Rebase on 2.6.1.  Re-ran qa-regression-testing libvirt/qemu.

** Patch added: "qemu_2.6.1+dfsg-0ubuntu2.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1541902/+attachment/4742034/+files/qemu_2.6.1+dfsg-0ubuntu2.debdiff

** Changed in: qemu (Ubuntu)
   Status: Triaged => In Progress

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[Bug 1541902] Re: [FFe] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

[Jon Grimm]

PPA rebased on 2.6.1.  I'm running qa-regression-testing libvirt/qemu
tests on it now.  Will upload debdiff for sponsorship once testing
complete.

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[Bug 1541902] Re: [FFe] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

[Steve Langasek]

Reviewing the diff, the changes are all well-isolated to hw/ppc + target-ppc, 
with the following exceptions:
 - trace-events
 - a few additions to generic headers
 - 98295803b5a7929232fd92ecf17137c991273678, 
fc8865d5c3e733c7b03070017778b31de22c329f, 
94582d197efb7030f5d0dccab6165c28fb62d5b5 and 
561e77f740999600449223c912126a575c7ec3ce, which make changes to 
hw/vfio/common.c and memory.c which appear to be reasonably self-contained 
changes
 - b6dc0429cb690572984e34aa6bfe557beed82282, which makes intel iommu handling 
more strict; this doesn't appear to be an actual prerequisite for the rest of 
the ppc64el patches, but it also appears to be harmless in the sense that it 
will cause earlier failure in the case of driver errors
 - changes to hw/vfio/common.c in 330619403e536e0e31671ae5bcd9f9921e73d9c9 
which are spapr-specific (and therefore ppc-specific in practice)

This looks like a reasonably safe change, given the testing that's been
done in the ppa.

As part of this FFe, these patches should be re-tested on top of 2.6.1
(LP: #1617055).

** Changed in: qemu (Ubuntu)
   Status: Confirmed => Triaged

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  KVM

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[Bug 1541902] Re: [FFe] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

[Jon Grimm]

Thank you.   Awaiting FFe approval now.   But looks like I may need to
reapply on top of pending 2.6.1 that has an FFe in progress atm.

** Summary changed:

- Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM
+ [FFe] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

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[Bug 1541902] Re: [FFE] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

[Serge Hallyn]

No that seems to be the entirely wrong patchset.

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[Bug 1541902] Re: [FFE] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

[Serge Hallyn]

Happy to.  I'll take the patchset from May 11,

Subject: [Qemu-devel] [for-2.7 PATCH v3 00/15] Core based CPU hotplug
for PowerPC sPAPR

Please shout if that is not the best one to use.

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Re: [Bug 1541902] Re: [FFE] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

[Ryan Harper]

Serge, we may want to pull them in and put in a PPA to see if IBM and
others can give the patchset a try.  And ideally they'd report to
qemu-devel of their success/problems.

On Fri, May 13, 2016 at 8:17 AM, Serge Hallyn <1541...@bugs.launchpad.net>
wrote:

> Thanks, Ryan.  We'll hold off until the next round.
>
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>   KVM
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Re: [Bug 1541902] Re: [FFE] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

[Serge Hallyn]

Thanks, Ryan.  We'll hold off until the next round.

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[Bug 1541902] Re: [FFE] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

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** Tags removed: bot-comment bugnameltc-136627 severity-high

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Re: [Bug 1541902] Re: [FFE] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

[Ryan Harper]

I'd say we should hold off:

http://lists.nongnu.org/archive/html/qemu-devel/2016-04/msg03092.html

Includes this bit:

>> Why 64-bit math here, but 128 bit math in the region_add path?

>

> Hm. Good question. It has been copied from the common VFIO code where it was
since 7532d3cbf1, back those days I did not even think of VFIO devices
hot(un)plugging
so
> region_del() was never executed so this seems to be a bug there and here.
Yet another patch is coming then

There are other things that aren't nearly as troublesome but it certainly
feels like another round of patches are forthcoming.
I didn't get a feeling from the patchset that this was functional, no
Tested-by: or Acked-by: either.


On Thu, May 12, 2016 at 1:11 PM, Serge Hallyn <1541...@bugs.launchpad.net>
wrote:

> (Make that @raharper ^ )
>
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>   KVM
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[Bug 1541902] Re: [FFE] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

[Serge Hallyn]

Seems like the upstream discussion is still unresolved in some areas
(and no patches are upstream in the git tree) and I don't understand
why.

I'm happy to pull these patches in now.  Just as a sanity check,
@rharper - any definite badness that you see?

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[Bug 1541902] Re: [FFE] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

[Serge Hallyn]

(Make that @raharper ^ )

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[Bug 1541902] Re: [FFE] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

[Mathew Hodson]

** Changed in: qemu (Ubuntu)
   Importance: Undecided => High

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[Bug 1541902] Re: [FFE] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

[Breno Leitão]

Dear Canonical,

A new patchset (version 15) was sent upstream, and already reviewed by
David Gibson.

http://lists.nongnu.org/archive/html/qemu-devel/2016-04/msg00360.html

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[Bug 1541902] Re: [FFE] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

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[Bug 1541902] Re: [FFE] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

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[Bug 1541902] Re: [FFE] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

[Breno Leitão]

I would like to justify this FFe as this is an important feature for
Ubuntu 16.04/ppc64el

[Technical Justification]
This feature enables GPU pass through to work decently on Ubuntu KVM. Without 
this feature, GPU pass through works with a very bad performance, which is 
completely unusable in production. This feature enables a huge performance 
improvement, allowing Ubuntu KVM deployment in production environments.

[ Customer justification]
There are numerous partners interested in this feature, and a real set of 
customers that will be taking benefit directly if this feature makes Ubuntu 
16.04 release.

[Testing plan]
This set of patch is being tested internally at IBM.

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[Bug 1541902] Re: [FFE] Enable DDW on qemu aiming GPU passthrough performance on Ubuntu KVM

[Breno Leitão]

I would like to justify this FFe as this is an important feature for
Ubuntu 16.04/ppc64el

[Technical Justification]
This feature enables GPU pass through to work decently on Ubuntu KVM. Without 
this feature, GPU pass through works with a very bad performance, which is 
completely unusable in production. This feature enables a huge performance 
improvement, allowing Ubuntu KVM deployment in production environments.

[ Customer justification]
There are numerous partners interested in this feature, and a real set of 
customers that will be taking benefit directly if this feature makes Ubuntu 
16.04 release.

[Testing plan]
This set of patch is being tested internally at IBM.

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