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Re: [win-pv-devel] PV Drivers Offline Removal
Sorry just resending this as I managed to hit 'Reply' rather than
'Reply All' and remove the list as a recipient.
Paul,
Yes, I see INACCESSIBLE_BOOT_DEVICE when it attempts to boot which
seems to map to 0x7B.
Joel
On 16/09/15 12:51, Paul Durrant wrote:
Joel,
What BSOD code was it? I’m
assuming 0x7B.
Paul
Paul,
Just
to be clear I've previously had success removing the
drivers online using the uninstallers so I would
assume that still works. The way I am removing the
drivers at the moment is using Dism so that the
process is fully offline. I have tried also removing
that unplug value after removing the drivers with Dism
which gives me the same windows blue screen (and then
being rebooted into automatic repair) as without
modifying the Unplug value.
I
am happy to send over the logs if this is something
that should work but I don't want to waste your time
if this is not something you hope to support.
Cheers,
Joel
Joel,
Yes,
you need to remove the drivers *and* the
unplug keys… sorry if that was not clear. Doing
that should work so could you send me logs of
your failed VM boot? I’ll also try to repro.
Assuming
you’re using qemu trad, I just need the qemu log
from /var/log/xen.
Cheers,
Paul
Hi
Paul,
I
have now got the 8.1.0-rc2 installed and
working. I tried removing the Unplug value
you suggested and then rebooting but that
value just seems to reappeared and the
drivers still seem to be in use - they are
reported by driverquery and the devices
appear in 'Computer Management'. I have also
tried removing the drivers with Dism and
changing the Unplug value after removing the
drivers with Dism which both resulted in an
unbootable system like before.
I'll
try the other suggestions people here made
and see if those are any help but is there
anything you would recommend or some
information I can find to help debug this? I
only built the 8.1.0-rc2 code but I'm happy
to retry with the code from master if
there's been any changes in this area since
the RC.
Cheers,
Joel
Thanks.
It would be good to confirm it
actually works
J
Paul
Paul,
Thanks for the reply. The version
of the drivers I am using doesn't
seem to have added that key to the
registry so I will try the same
tests with the 8.1.0-rc2 code
which contains your recent changes
to the unplug code. I will let you
know how I get on.
Cheers,
Joel
Joel,
Offline removal should be
quite possible. The thing
that needs to be cleaned up
to make sure the image will
reboot are the ‘unplug’
values that are used early
on in boot to request unplug
of emulated devices in QEMU.
Look under
HKLM/system/currentcontrolset/services/xen
and you should see a key
called ‘Unplug’. If you
delete that key then the
next reboot should use
emulated devices and so
should be fine with no PV
drivers.
Cheers,
Paul
Hi
All,
We are currently using
the GPLPV drivers but
are hoping to move to
the new Xen WINPV
drivers as they are
actively developed and
have some new features
which we are interested
in. We currently have a
process where VMs can be
moved from our Xen
hypervisor into EC2.
This process relies on
the fact that we are
able to remove the
drivers from an offline
image. Previously we
have been removing the
drivers successfully by
converting the disk
images to a VHD file,
using Dism to remove the
drivers (https://technet.microsoft.com/en-GB/library/dd744355%28v=ws.10%29.aspx)
and then importing the
resulting VHD into EC2.
This works with the
GPLPV drivers but with
the new WINPV drivers it
creates an unbootable
image (the import into
EC2 fails and the image
can also not be booted
on the original
hypervisor).
I have found some
previous posts on this
mailing list (http://lists.xenproject.org/archives/html/win-pv-devel/2015-03/msg00076.html)
discussing removing the
drivers and I am able to
successfully remove the
drivers from an online
image but sadly our
process requires that
this removal be
performed offline.
I am just wondering if
anyone else is using
Dism in windows to
remove the PV drivers
from an offline image?
Or if anyone else has
successfully removed the
WINPV drivers from an
offline image at all?
Any pointers anyone can
give would be
appreciated. The only
way we have so far found
to make the image boot
after removing the
drivers with Dism is by
manual modification of a
large number of registry
keys which seems like a
far from ideal solution.
Thanks for any help,
Joel
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