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Re: [Qemu-devel] [Xen-devel] [PATCH] Citrix PV Bus device

From: Paul Durrant
Subject: Re: [Qemu-devel] [Xen-devel] [PATCH] Citrix PV Bus device
Date: Tue, 2 Jul 2013 09:14:01 +0000

> -----Original Message-----
> From: Ian Campbell
> Sent: 02 July 2013 09:57
> To: Paul Durrant
> Cc: address@hidden; address@hidden
> Subject: Re: [Xen-devel] [PATCH] Citrix PV Bus device
> On Tue, 2013-07-02 at 09:39 +0100, Paul Durrant wrote:
> > This patch introduces a new PCI device which will act as the binding point
> > for Citrix branded PV drivers for Xen.
> > The intention is that Citrix Windows PV drivers will be available on Windows
> > Update and thus using the existing Xen platform PCI device as an anchor
> > point is not desirable as that device has been ubiquitous in HVM guests for
> > a long time and thus existing HVM guests running Windows would start
> > automatically downloading drivers from Windows Update when this may
> not be
> > desired by either the host or guest admin.
> What about
> <address@hidden>
> ?

I had actually coded up a solution based on the existing Xen platform device, 
by having it synthesize a device ID based on the Xen version to which we could 
then host the xenbus driver, to allow us to deploy multiple versions of xenbus 
should compatibility (with things such as the shared info interface) become an 
issue. The co-installer for this driver could also spot existing PV driver 
installations and make sure they don't get trashed.

This idea was rejected by Citrix product teams though, because we would not be 
able to prevent any Windows guest without some known PV drivers from 
downloading our new driver from Windows Update and this was seen as undesirable.


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