[Bug 1394327] Re: unmapping of persistent grants in qemu

[Stefan Bader]

SRU justification:

Impact: As soon as dom0 starts qemu it will try to locally attach
QCOW(2) images in case a PV guest is using those. This results in the
described errors and sometimes the whole host is rendered unusable.

Fix: Cherry picking an upstream patch (which was done already for Vivid)
resolves the issues.

Testcase: Prepare a PV guest that uses a QCOW2 image and try to start
it. Depends on Xen starting dom0 (bug #1396068).

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https://bugs.launchpad.net/bugs/1394327

Title:
  unmapping of persistent grants in qemu

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