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Re: [Xen-devel] [PATCH v1] unmodified_drivers: unplug the emulated devices at resume time

>>> On 12.06.18 at 16:10, <olaf@xxxxxxxxx> wrote:
> Since qemu-2.10 it is required to unplug emulated devices again after
> a live migration. If this is not done, qemu's block-backend driver
> will be unable to open the backing disk image because it is still busy
> by qemu's IDE driver. As a result the domUs block-frontend driver will
> be unable to access the disks, and the domU has to be destroyed.
> libxl is unable to detect the situation.

So there's no plan to fix this on the qemu side?

> Apply the same workaround for this qemu bug that was done already
> years ago in linux.git with commit 512b109ec962 ("xen: unplug the
> emulated devices at resume time") to make sure xenlinux based domUs
> can be migrated to unfixed hosts.

Hmm, that change has no explanation whatsoever of why this was
necessary already back at that time. Stefano?


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