Re: [Qemu-devel] [PATCH RFC] virtio-pci: add MMIO property

On Tue, Mar 20, 2012 at 10:22:42AM +1030, Rusty Russell wrote:

On Mon, 19 Mar 2012 17:13:06 -0500, Anthony Liguori [off-list ref] wrote:

quoted

quoted

Maybe just make this a hidden option like x-miio?

x-violate-the-virtio-spec-to-trick-old-linux-drivers-into-working-on-power?

"To configure the device, we use the first I/O region of the PCI
device."

Meh, it does sound a little like we are specifying that it's an PCI I/O
bar.

Let's resurrect the PCI-v2 idea, which is ready to implement now, and a
nice cleanup?  Detach it from the change-of-ring-format idea which is
turning out to be a tarpit.

Thanks,
Rusty.

Yes. But it seems silly to even write code to play with device config in
memory when we agreed the right thing to do is to use a config vq
everywhere.

Now a question: does a oconfig vq look like a PCI specific
feature to you, a work-around for lack of multibyte atomic
accesses? If yes it's sane to make it a PCI capability.
Or is it something most transports would need? If yes we
need a feature bit and this is a chicken and egg problem ...

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