Re: [RFC] virtio-blk PCI backend

[Carsten Otte <cotte-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>]

Arnd Bergmann wrote:
> Not sure if I'm following the reasoning here. Shouldn't the method be
> inherent to the virtio bus driver?
> 
> When you use a PCI based virtio bus, the natural choice would be PIO
> in some way, but you could also have a different virtio implementation
> on PCI that uses hcalls. This choice is completely up to virtio-pci.
> 
> On s390, you have a different virtio backend altogether, so you always
> use DIAG or hcall instead of whatever virtio-pci does.
> 
> The virtio-blk and other high-level drivers don't need to care about
> what transport the bus uses in the first place.

If you look at HPA's virtio PCI bus in lguest, it uses PCI device 
organization but no other PCI features. That's where we're heading, 
because we don't want a different virtio backend.

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