Re: [virtio-dev] Re: [PATCH] Add virtio gpu driver.

  Hi,

I don't know. This seems exactly like the kind of thing
we had in mind when we added the virtio pci capability.
For example, we have text in spec that requires drivers
to skip unknown capabilities.

And yes, if bios pokes at a specific bar then we do
need to list this info in the virtio spec so this makes
it an issue that is virtio related.

Hmm, virtio-vga is a two-in-one device basically.  When virtio is
enabled it behaves like virtio-gpu-pci, otherwise it behaves very
simliar to stdvga.  So you need to know nothing about virtio to handle
the vga side, and I want keep it that way.

When no vga compatibility is needed there always is the option to just
use virtio-gpu-pci instead.

Yes, it's not about what we put there now. It's about being able
to move things about in the future without breaking guests.

We don't have that today for stdvga, and I still fail to see what this
buys us.


Completely different thing crossing my mind:  I think we can make
virtio-vga fully compatible with stdvga.  stdvga has two bars, memory
(#0) and mmio (#2).  We can make the mmio bar larger and place all the
virtio regions there.


I think in any case I'll go split off the vga compatibility bits to a
different patch (and possible a separate patch series).

cheers,
  Gerd


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