Re: [Xen-users] PCI Passthrough to VMX Guest

["M.A. Williamson" <maw48@xxxxxxxxx>]

Sorry, PCI passthrough to VMX guests isn't supported - the guest has to be 
paravirt and be running the PCI frontend driver.
The VMX spec does include some helpful features for passing PCI devices 
through to a guest, and I'm sure it's possible to make it work - in 
principle. I don't know of anyone actually planning to hack on it though 
:-(
However, there are plans to improve the display performance for VMX guests, 
so you should find the virtual framebuffer will improve in future releases. 
I understand that using rdesktop in domain0 to connect to the guest also 
works very well and provides quite snappy UI performance.
Cheers,
mark

On Mar 21 2006, David Goodlad wrote:

> Hi everyone
>
> I've finally got my VMX guest working great (WinXP Pro) on here. 
> However, I've got one more thing that I'd like to do.  I have a
> secondary PCI-E video card that I want to pass through to the VM.  I
> am using xen-unstable, so I know passthru is available...
>
> I have 2 graphics cards installed: an old 4MB PCI SiS 6326, and a
> PCI-E Geforce 6200.  The PCI card is initialized first by the BIOS, so
> it is the only one being used by Xen afaict.  I have setup my kernel
> cmdline options to include:
>
> pciback.hide=(06:00.0)
>
> 06:00.0 is the address reported by lspci for the nVidia card.  I've
> also got a line in my vmx guest's config:
>
> pci = [ '06:00.0' ]
>
> I still see the device in lspci (I suspect that I shouldn't here!).  I
> can't get Windows to see the device at all, either.
>
> Anyone have any idea what could be preventing the device from being
> hidden?  Is pci passthru supposed to work with VMX guests (ones w/o
> the pci frontend)?
>
> Thanks!
> Dave
>
> --
> Dave Goodlad
> dgoodlad@xxxxxxxxx or dave@xxxxxxxxxx
> http://david.goodlad.ca/
>
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