Re: [Xen-users] Removing old glpv windows drivers to install new -> inaccessible boot device

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: dunlapg@xxxxxxxxx [mailto:dunlapg@xxxxxxxxx] On Behalf Of
> George Dunlap
> Sent: 29 October 2015 09:39
> To: ÃliÃs TamÃs
> Cc: Matthias; xen-users@xxxxxxxxxxxxx; Paul Durrant
> Subject: Re: [Xen-users] Removing old glpv windows drivers to install new ->
> inaccessible boot device
> 
> On Wed, Oct 28, 2015 at 8:50 AM, ÃliÃs TamÃs <et@xxxxxxx> wrote:
> > Hi. Yes, I confirm, that booting into safe mode is possible. I turned on
> > testsigning with bcdedit, and tried installing the drivers again.
> >
> > The isntall went fine, I could reboot. Unfortunately since then (it is
> > more then 8 hours now) I'm facing the attached screen. The animation is
> > just rolling, rolling rolling and nothing happens. CPU ticks are used,
> > so I assume something is happening, but it seemes pretty much stuck.
> >
> > Any ideas?
> 
> I *think* the XenServer PV drivers are using miniport; in which case
> this KB article might be of use:
> 
> https://support.microsoft.com/en-us/kb/2795397
> 
> Paul Durrant can correct me if I'm wrong about miniport (and may be
> able to point you to a more useful fix if so).
> 

Miniport is just a Windows driver programming paradigm and doesn't mean a lot 
without qualification. However, looking at the KB article it seems that the 
subject is our old friend that 0x7B BSOD. In Xen PV driver installations this 
usually occurs when there is an incomplete driver installation or removal such 
that the 'master' PV driver (the Xen Project drivers actually have two: XENBUS 
and XENFILT) has requested unplug of the emulated disks, but the PV disk driver 
(the Xen Project one is called XENVBD) is missing. This means Windows has no 
system disk and the BSOD is the result.

The usual way to recover from this is to boot into safe mode (most PV drivers, 
including the Xen Project ones, will be disabled in this mode) and clean up the 
registry to get things back into a consistent state. Unfortunately you really 
need to know your way around the drivers you're trying to remove to be able to 
do this but blowing way all the service keys (under 
HKLM/system/currentcontrolset/services) for drivers you no longer want will 
usually do the trick.

  Paul

>  -George
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