Re: [Xen-devel] [BUG] blkback reporting incorrect number of sectors, unable to boot

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 10.11.17 at 10:40, <Paul.Durrant@xxxxxxxxxx> wrote:
>> Anthony PERARD
>> Sent: 09 November 2017 17:50
>> The problem is that QEMU 4.10 have a lock on the disk image. When
>> booting an HVM guest with a qdisk backend, the disk is open twice, but
>> can only be locked once, so when the pv disk is been initialized, the
>> initialisation kind of fail.
>> Unfortunatly, OVMF will wait indefinitly until the PV disk is
>> initialized.
> 
> That's presumably because the OVMF frontend leaves the emulated disk plugged 
> in despite talking via PV?

Well, how could it not? It can't know whether the OS to be booted
is going to have PV drivers, and iirc the unplug is not reversible.
Shouldn't OVMF close the blkif connection, with the backend
responding to this by unlocking (and maybe closing) the image?

Jan


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