From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([140.186.70.92]:46592)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <frederic.dreier@gmail.com>) id 1Qp25f-0003BE-Fk
	for qemu-devel@nongnu.org; Thu, 04 Aug 2011 13:52:16 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <frederic.dreier@gmail.com>) id 1Qp25e-0000sg-0z
	for qemu-devel@nongnu.org; Thu, 04 Aug 2011 13:52:15 -0400
Received: from mail-yi0-f45.google.com ([209.85.218.45]:39165)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <frederic.dreier@gmail.com>) id 1Qp25d-0000sb-Pd
	for qemu-devel@nongnu.org; Thu, 04 Aug 2011 13:52:13 -0400
Received: by yia25 with SMTP id 25so1441194yia.4
	for <qemu-devel@nongnu.org>; Thu, 04 Aug 2011 10:52:13 -0700 (PDT)
MIME-Version: 1.0
Date: Thu, 4 Aug 2011 19:52:12 +0200
Message-ID: <CAA5b1Eu3rFXP7uWO90ZxO7-f_BLaPpFamOn_hWw9-bALu4VTXg@mail.gmail.com>
From: =?ISO-8859-1?Q?Fr=E9d=E9ric_Dreier?= <frederic.dreier@gmail.com>
Content-Type: multipart/alternative; boundary=000e0cd706da04712e04a9b1a4e6
Subject: [Qemu-devel] read-only IDE drives in qemu
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: qemu-devel@nongnu.org

--000e0cd706da04712e04a9b1a4e6
Content-Type: text/plain; charset=ISO-8859-1

Hi,

We are updating some machines in our server farm to Ubuntu natty (KVM /
Opennebula cluster). Since then we used to have some VM with shared
read-only IDE disks to mirror software repositories through several isolated
networks (one-way data diode).

The updated qemu does not allow it. It failed to start the VM with a 'Can't
use a read-only drive' error. After checking in the qemu git, it seems that
this has been forbidden by this commit
'7aa9c811ca0761918a0252d0f923a80224953fa6' :

-----------------------------
Author: Markus Armbruster <armbru@redhat.com>  2010-06-28 19:10:36
Committer: Kevin Wolf <kwolf@redhat.com>  2010-07-06 17:05:50
Parent: c4d74df726cb3791d9f1661b58067df5608b627e (ide: Make ide_init_drive()
return success)
Child:  dce9e92834cc4f962e547cae46b73ca559d05b0c (ide: Reject invalid CHS
geometry)
Branches: master, remotes/origin/master, remotes/origin/stable-0.13,
remotes/origin/stable-0.14, remotes/origin/stable-0.15
Follows: v0.12.0-rc0
Precedes: v0.13.0-rc0

    ide: Reject readonly drives unless CD-ROM

    drive_init() doesn't permit option readonly for if=ide, but that's
    worthless: we get it via if=none and -device.

    Signed-off-by: Markus Armbruster <armbru@redhat.com>
    Signed-off-by: Kevin Wolf <kwolf@redhat.com>
-----------------------------

I do not understand the comment, if there is a workaround or if it something
to avoid.

May you help me to understand it?

Thank you,

Frederic

--000e0cd706da04712e04a9b1a4e6
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Hi,<br><br>We are updating some machines in our server farm to Ubuntu natty=
 (KVM / Opennebula cluster). Since then we used to have some VM with shared=
 read-only IDE disks to mirror software repositories through several isolat=
ed networks (one-way data diode).<br>
<br>The updated qemu does not allow it. It failed to start the VM with a &#=
39;Can&#39;t use a read-only drive&#39; error. After checking in the qemu g=
it, it seems that this has been forbidden by this commit &#39;7aa9c811ca076=
1918a0252d0f923a80224953fa6&#39; :<br>
<br>-----------------------------<br>Author: Markus Armbruster &lt;<a href=
=3D"mailto:armbru@redhat.com">armbru@redhat.com</a>&gt;=A0 2010-06-28 19:10=
:36<br>Committer: Kevin Wolf &lt;<a href=3D"mailto:kwolf@redhat.com">kwolf@=
redhat.com</a>&gt;=A0 2010-07-06 17:05:50<br>
Parent: c4d74df726cb3791d9f1661b58067df5608b627e (ide: Make ide_init_drive(=
) return success)<br>Child:=A0 dce9e92834cc4f962e547cae46b73ca559d05b0c (id=
e: Reject invalid CHS geometry)<br>Branches: master, remotes/origin/master,=
 remotes/origin/stable-0.13, remotes/origin/stable-0.14, remotes/origin/sta=
ble-0.15<br>
Follows: v0.12.0-rc0<br>Precedes: v0.13.0-rc0<br><br>=A0=A0=A0 ide: Reject =
readonly drives unless CD-ROM<br>=A0=A0=A0 <br>=A0=A0=A0 drive_init() doesn=
&#39;t permit option readonly for if=3Dide, but that&#39;s<br>=A0=A0=A0 wor=
thless: we get it via if=3Dnone and -device.<br>
=A0=A0=A0 <br>=A0=A0=A0 Signed-off-by: Markus Armbruster &lt;<a href=3D"mai=
lto:armbru@redhat.com">armbru@redhat.com</a>&gt;<br>=A0=A0=A0 Signed-off-by=
: Kevin Wolf &lt;<a href=3D"mailto:kwolf@redhat.com">kwolf@redhat.com</a>&g=
t;<br>-----------------------------<br>

<br>I do not understand the comment, if there is a workaround or if it some=
thing to avoid. <br><br>May you help me to understand it?<br><br>Thank you,=
<br><br>Frederic<br><br><br>

--000e0cd706da04712e04a9b1a4e6--