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Re: [Xen-devel] q35 in xen? vfio in xen?

On Fri, Feb 21, 2014 at 09:41:39PM +0000, Zhang, Eniac wrote:
> Hi all,
> I am playing with q35 chipset in qemu (1.6.1).  It seems we can't enable q35 
> machine under xen yet.  I made a few quick hacks which all fail miserably 
> (linux kernel oops and window BSOD).  I was wondering why this hasn't been 
> done (q35 was introduced into qemu in 2009).
> Next question, vfio works very well for me in standalone qemu (with Linux 
> host handling iommu), but is that supported under xen?  I haven't tried 
> anything there yet because my gut-feeling is that it won't work.  Because 
> passing vfio device to qemu can only be done on qemu commandline, and xen is 
> not aware of this passing through device, thus not able to make iommu 
> arrangement for this device.  Am I on the right track here?

Yes and no. VFIO won't work - but QEMU does do PCI passthrough under Xen. It 
a different mechanism (and you need to bind the device to pciback).

> I am interested in implementing both these two features.  I'd like to connect 
> with anyone who's already on this so we don't duplicate the efforts.

What do you need Q35 for?

> Regards/Eniac

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