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

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Gerd Hoffmann [mailto:kraxel@xxxxxxxxxx]
> Sent: 24 July 2013 11:20
> To: Paul Durrant
> Cc: qemu-devel@xxxxxxxxxx; xen-devel@xxxxxxxxxxxxx
> Subject: Re: [Qemu-devel] [PATCH] Citrix PV Bus device
> 
> On 07/02/13 16:03, 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. This device therefore acts as
> > an opt-in for those wishing to deploy Citrix PV drivers.
> 
> How does this differ from the xen platform pci device, except for the
> fact that it has a different PCI ID?
> 

This model doesn't implement the fixed IO ports that the platform device does 
but he main point *is* the different PCI ID.

This patch has been superseded by the Xen PV Device patch (see 
https://lists.gnu.org/archive/html/qemu-devel/2013-07/msg00733.html) which 
generalizes the device to make the vendor ID, device ID and revision values 
configurable.

  Paul


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