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Date: Tue, 15 Jul 2014 22:57:54 +0200
From: =?iso-8859-1?Q?Beno=EEt?= Canet <benoit.canet@irqsave.net>
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Subject: Re: [Qemu-devel] Current State of Block Filter
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To: Wolfgang Richter <wolf@cs.cmu.edu>
Cc: benoit.canet@irqsave.net, Stefan Hajnoczi <stefanha@gmail.com>, qemu-devel <qemu-devel@nongnu.org>, Kevin Wolf <kwolf@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>

The Tuesday 15 Jul 2014 =E0 10:49:31 (-0400), Wolfgang Richter wrote :
> The way I see block filter currently implemented is as a special block
> device
> with `is_filter` set to true.
>=20
> Is this a correct characterization of the current incarnation?

Yes,

>=20
> If so, I was wondering if it is possible to "insert" a block filter lay=
er
> on top
> of an existing block device once QEMU is executing (via QMP commands)?

No,

We would like to achieve that be we didn't have a way to do that while re=
specting
all the requirements.

>=20
> It seems possible to add block filter managed block devices, but I don'=
t
> think
> I see a way of adding a block filter to an existing block device.

No way to do so right now.


Best regards

Beno=EEt

>=20
> --
> Wolf