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Re: [win-pv-devel] PV Drivers Offline Removal
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
From: Paul Durrant <Paul.Durrant@xxxxxxxxxx>
Sent: 16 September 2015 11:30
To: Joel Noyce-Barnham; win-pv-devel@xxxxxxxxxxxxxxxxxxxx
Subject: RE: PV Drivers Offline Removal
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
From:
Joel Noyce-Barnham [mailto:joel.noyce-barnham@xxxxxxxxxxx]
Sent: 16 September 2015 11:26
To: Paul Durrant; win-pv-devel@xxxxxxxxxxxxxxxxxxxx
Subject: Re: PV Drivers Offline Removal
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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