Re: [Xen-users] Unable to remove GPLPV drivers without breaking win2k3 domU - SUCCESS

[James Pifer <jep@xxxxxxxxxxxxxxxx>]

On Tue, 2008-07-01 at 00:10 +0100, Andy Burns wrote:
> On 30/06/2008 19:52, James Pifer wrote:
> 
> > DANG! 
> > 
> > In my case I have 0.8.8 loaded, but I'm not even loading /gplpv. I
> > originally loaded it to get rid of the unknown PCI device, which it
> > did. 
> 
> OK, I tried again and got it working with 0.9.10 instead of 0.9.11-pre4 
> (though the version might not be significant)
> 
> I was a bit more fussy about what registry settings I kept and removed 
> this time, also I think I didn't wait at the "grey progress screen" for 
> long enough last time, it sticks there for what feels like two or three 
> minutes.
> 
> So to summarise what I did ...
> 
> 1) ensure domU will boot without /GPLPV
> 
> 2) reboot into recovery console from windows CD (or ISO)
> 
> 3) disable all xen services/drivers *except* xenhide
> 
> 4) boot into windows, without /GPLPV
> 
> 5) If any "hardware detected" dialogs are raised, cancel them, do not 
> allow any xen drivers/services to be re-installed.
> 
> 6) Start regedit
> 
> Alter
> HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\ACPI_HAL\PNP0C08\0\Control\ActiveService
> from
> "XenHide" to "ACPI"
> 
> Search the whole registry for "xen" and set permissions/remove keys/values
> 
> Don't remove anything under HKLM/HARDWARE/ACPI
> 
> Do remove all the UpperFilter/LowerFilter values
> 
> Beware of false matches such as "xenroll" "IVBSAXEntityResolver"
> 
> Check where currentcontrolset points to, so you know which 
> controlset01/02 etc to ignore and which to process.
> 
> 7) reboot without /GPLPV
> 
> 8) If any "hardware detected" dialogs are raised, cancel them, do not 
> allow any xen drivers/services to be re-installed.
> 
> 9) Within C:\windows delete xen*.sys and cached DIFx copies in 
> DRIVERSTORE folders
> 
> 10 delete all oem*.?nf files which are related to gplpv
> 
> 11) reboot without /GPLPV
> 
> at this point the machine should be "clean" of the old xen drivers, if 
> you're using LVM you might like to snapshot it at this point.
> 
> I then installed the 0.9.10 drivers from the .exe and accepted all 
> "unsigned driver" prompts, in device manager you should see the PV 
> devices (with yellow bangs) as well as the QEMU devices
> 
> 12) reboot *with* /GPLPV
> 
> Be patient at the grey screen ;-)
> 
> Hopefully your machine will boot and now the QEMU devices will have 
> yellow bangs and the Xen PV devices will not!
> 
> I did a quick iometer test with 100% sequental 64Kb reads and got about 
> 37MB/s a PV linux domU on the same hardware gets about twice that, I'll 
> do some more perf testing soon.
> 
> Good luck.
> 

I'll give this another shot. Most of current machines are running in
sparse image files, not as LVMs, so before I do any of this I'm making a
sparse copy first. 

I'm also trying to install a fresh copy of win2k3 for a couple reasons.
One is to install later xen pv drivers, but also to get multiple CPUs.
My current win2k3 image refuses to recognize more than one. I don't know
if that's a xen problem or my image problem. Supposedly win2k3
automatically adjusts the hal.  

Frustrating though, I can't even get win2k3 to install right now! 

Thanks for the detailed removal instructions!

James



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