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RE: [Xen-devel] Re: [vt-d][xen4-rc6] Hangs on startup

To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Łukasz Oleś <lukaszoles@xxxxxxxxx>
Subject: RE: [Xen-devel] Re: [vt-d][xen4-rc6] Hangs on startup
From: "Nadolski, Ed" <Ed.Nadolski@xxxxxxx>
Date: Mon, 22 Mar 2010 15:06:48 -0600
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Thread-topic: [Xen-devel] Re: [vt-d][xen4-rc6] Hangs on startup

> -----Original Message-----
> PCI back is to be used _only_ with PV guests - you on the other
> hand are running an HVM guest.
> Per the earlier statement, I would recommend you use the 'pciback'
> instead of 'pci-stub' or just not compile pciback in and see what
> happens. Keep in mind: PCI back module is only needed when you want to
> do PV PCI passthrough, which is not what you are doing.

I'm confused - does that mean pci-stub must be used for device assignment to an 
HVM guest?  The VTdHowTo isn't clear on that.

Is there a way to bind the PCI devices to pci-stub at boot time, like with 
pciback?  Also, do the 'xm pci-list-assignable-devices' and 'xm pci-list' 
commands work the same for both pciback and pci-stub bindings?

It seems odd to have different ways to do bindings for PV and for HVM. For 
example, would I have to switch the bindings if I want to first assign a device 
to a PV guest, then stop the PV guest and re-assign the device to an HVM guest?


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