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Re: [Xen-devel] migration regression in xen-4.11 and qemu-2.11 and qcow2

On Tue, May 08, 2018 at 01:31:43PM +0200, Olaf Hering wrote:
> It is unclear why that was never noticed in xen-4.10, qemu-2.9 did not have 
> that bug.
> Also, if a KVM or Xen guest is migrated should make zero difference for the 
> qcow2 driver...

Hi Olaf,

I did try to fix a migration related issue that has to do with a new
lock placed by qemu. But if the issue your having is actually fixed.

The lock as been introduced in QEMU 2.10, but the was not working well
with Xen, so for Xen 4.10, I've apply to qemu-xen-4.10:
    migration, xen: Fix block image lock issue on live migration

I did fix the bug in QEMU 2.11 (5d6c599fe1d69a1bf8c5c4d3c58be2b31cd625ad)
so Xen 4.11 does include it it the qemu-xen tree.

There is one last commit for libxl:
    libxl_qmp: Tell QEMU about live migration or snapshot

I'm not sure if that information is going to help, but that what I have
for now about the lock of block images.

Anthony PERARD

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