Xen users - Feb 2009 - Removing Citrix PV Drivers and then installing GPLPV drivers

I''m in the process of migrating XenServer virtuals over to open source
Xen.  Things are going along really well, except I haven''t been able to
successfully remove the Citrix Windows PV drivers and then install the
GPLPV drivers.  After I remove the Citrix PV drivers, the drivers seem
like they are gone.  I then install the GPLPV drivers, which claim to
install successfully, but then the system pops up a message saying it
found the Citrix XenSource PV Ethernet adapter again and it wants to
install xennet.sys from the XenSource directories (which are no longer
there).  I''ve shown it where the new xennet.sys driver is, but that
doesn''t make it happy.  Somewhere in this mix is some old INF file or
something that is preventing the GPL drivers from taking over completely.

Any ideas how to really uninstall the Citrix drivers?


Thanks for any help!
pace


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> 
> I''m in the process of migrating XenServer virtuals over to open
source
> Xen.  Things are going along really well, except I haven''t been
able
to
> successfully remove the Citrix Windows PV drivers and then install the
> GPLPV drivers.  After I remove the Citrix PV drivers, the drivers seem
> like they are gone.  I then install the GPLPV drivers, which claim to
> install successfully, but then the system pops up a message saying it
> found the Citrix XenSource PV Ethernet adapter again and it wants to
> install xennet.sys from the XenSource directories (which are no longer
> there).  I''ve shown it where the new xennet.sys driver is, but
that
> doesn''t make it happy.  Somewhere in this mix is some old INF file
or
> something that is preventing the GPL drivers from taking over
completely.
> 
> Any ideas how to really uninstall the Citrix drivers?
> 
Some suggestions...

. you should still be able to force installation via manually installing
the driver with the ''have disk'' option.
. delete all the oem*.[ip]nf files that are for the citrix drivers (from
c:\windows\inf)
. search the registry (currentcontrolset) for any reference to xen and
delete it, but be careful. Windows must be remembering the deviceID

My GPLPV drivers enumerate devices as eg xen\vbd\768, xen\vif\0. Citrix
drivers must be doing the same. I would if I should enumerate them with
a slightly different prefix...

James

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> My GPLPV drivers enumerate devices as eg xen\vbd\768, xen\vif\0. Citrix
> drivers must be doing the same. I would if I should enumerate them with
> a slightly different prefix...
>
>   
Citrix enum''s the network as XEN\VIF\0 as well, so deleting the
references to that from the various control sets in the registry has
been doing the trick so far. So maybe a different prefix would be a good
idea for the GPLPV drivers. FYI, their disk enums as something like
Disk&Ven_XEN&Prod_PVDISK&%versioninfogoeshere% so your vdb driver
isn''t
clashing with it...


pace

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> 
> > My GPLPV drivers enumerate devices as eg xen\vbd\768, xen\vif\0.
Citrix
> > drivers must be doing the same. I would if I should enumerate them
with
> > a slightly different prefix...
> >
> >
> Citrix enum''s the network as XEN\VIF\0 as well, so deleting the
> references to that from the various control sets in the registry has
> been doing the trick so far. So maybe a different prefix would be a
good
> idea for the GPLPV drivers. FYI, their disk enums as something like
> Disk&Ven_XEN&Prod_PVDISK&%versioninfogoeshere% so your vdb
driver
isn''t
> clashing with it...
Any suggestions for a prefix? I am in the middle of some pretty major
changes (going back to WDF again :) so changing the prefix now wouldn''t
be out of the question at this point. Given that pretty much nobody sees
it if everything is working properly, I''m thinking XenGPLPV\xxx\999
etc.
No chance of a clash there.

James

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> Any suggestions for a prefix? I am in the middle of some pretty major
> changes (going back to WDF again :) so changing the prefix now
wouldn''t
> be out of the question at this point. Given that pretty much nobody sees
> it if everything is working properly, I''m thinking
XenGPLPV\xxx\999 etc.
> No chance of a clash there.
>   
If there is no chance you''ll be blossoming the driver to become a set
of
drivers that can cover more than Xen (KVM?) someday then I like XenGPLPV
(easy to find, tells you what it is, can find it with either Xen or
GPLPV, etc).  Please excuse the thought if they are so different that
you''d never consider something like that...


pace

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> Citrix enum''s the network as XEN\VIF\0 as well, so deleting the
> references to that from the various control sets in the registry has
> been doing the trick so far.
I''ve also had one install that needed the Citrix oem*.inf/pnf files
removed from \windows\inf to make it happy.  The first 4 installs I had
cleaned those files out by itself when I uninstalled the Citrix Xen
Tools, but this latest one didn''t.


pace


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-----Original Message-----
From: xen-users-bounces@lists.xensource.com
[mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Mark Pace
Sent: Friday, February 06, 2009 19:16
To: James Harper
Cc: Xen Users
Subject: Re: [Xen-users] Removing Citrix PV Drivers and then installing
GPLPVdrivers

> Any suggestions for a prefix? I am in the middle of some pretty major
> changes (going back to WDF again :) so changing the prefix now
wouldn''t
> be out of the question at this point. Given that pretty much nobody sees
> it if everything is working properly, I''m thinking
XenGPLPV\xxx\999 etc.
> No chance of a clash there.
>   
If there is no chance you''ll be blossoming the driver to become a set
of
drivers that can cover more than Xen (KVM?) someday then I like XenGPLPV
(easy to find, tells you what it is, can find it with either Xen or
GPLPV, etc).  Please excuse the thought if they are so different that
you''d never consider something like that...


pace

_______________________________________________
	I don''t know much about the enumeration side of things, or the open
source development side for that matter, but in line with Mark''s
thought, I
would say something like GPLPV\(device)\(id) would probably work well in
general.  I mean, then if you were to drop your work on some site such as
SourceForge or otherwise pass it on to a new developer / new developers,
they would also have the option of expanding (should it even be possible)
without needing to change it again.  This would have the additional
advantage of allowing any software that may interface with these device
enumerations directly to continue to function if their development stops.
Of course, if it would only be possible by way of separate drivers, then you
might want to have Xen in there somewhere, so that this issue doesn''t
pop up
again if someone wants to migrate, and this suggestion may come from not
knowing the first thing about enumeration, but what about
GPLPV\(platform)\(device)\(id)?
	Dustin



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> I''m in the process of migrating XenServer virtuals over to open
source
> Xen.  Things are going along really well, except I haven''t been
able
> to successfully remove the Citrix Windows PV drivers and then install 
> the GPLPV drivers.  After I remove the Citrix PV drivers, the drivers 
> seem like they are gone.  I then install the GPLPV drivers, which 
> claim to install successfully, but then the system pops up a message 
> saying it found the Citrix XenSource PV Ethernet adapter again and it 
> wants to install xennet.sys from the XenSource directories (which are 
> no longer there).  I''ve shown it where the new xennet.sys driver
is,
> but that doesn''t make it happy.  Somewhere in this mix is some old
INF
> file or something that is preventing the GPL drivers from taking over 
> completely.
>
> Any ideas how to really uninstall the Citrix drivers?
>
>
> Thanks for any help!
> pace
>
Forgive my intrusion here on the topic but may I ask why you are 
replacing commercially supported drivers with "pre version 1" drivers?
Is the Citrix product actually worse than the OSS product?

I ask because I have been trying to figure out design for a small 
virtual server system (3-4 boxes with single Quad Core "Commodity" 
mother boards) to run a mix of both windows and Linux servers. I have 
been looking hard at Xen (both Citrix and OSS) so I am interested in 
your thoughts if you would care to provide any.

-- 
Doug Breshears.


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