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Re: [Xen-devel] [v5][PATCH 0/5] xen: add Intel IGD passthrough support

Il 25/06/2014 16:10, Michael S. Tsirkin ha scritto:
On Wed, Jun 25, 2014 at 03:53:30PM +0200, Paolo Bonzini wrote:
Il 25/06/2014 15:47, Michael S. Tsirkin ha scritto:
OK, so how about doing this: either for the ISA
bridge, or for the VGA card itself:

   set subsystem vendor id to PCI_VENDOR_ID_XEN,
   set subsystem device id to PCH device id

That would work, but the same problem would then arise for the MCH.  The
driver there is banging at random places in the configuration space.

This is why I asked for a solution that is future-proof, and since you can
make one that works for both MCH and PCH it is nice to do the work just

Q35 has MCH, so I don't see why we can't make that work,
extending it as appropriate.

Is Q35's MCH configuration space entirely compatible with newer chipsets that are in the host and that the IGD driver expects? I dont think it's safe to assume that.

Doing that for PIIX is iffy.
Should we really do that? Q35 is there.

Xen doesn't support Q35, and Q35 is still lacking migration. So it's really a chicken-and-egg problem.


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