[Ksummit-2012-discuss] PCI breakout session

Benjamin Herrenschmidt benh at kernel.crashing.org
Mon Jun 18 20:49:58 UTC 2012


> Also, assuming we write our own driver with its own
> allocator and balancer, we'd like some clean interface
> to tell a virtio pci device that we are moving its BARs
> while it's active.

You should never move a device BARs while it's active to begin with :-)
At least MMIO/IO enable bits must be cleared.

In any case, I don't see a need for re-arranging the MMIO layout at
hotplug time. VMs can do things differently and the fact that virtio
uses IO space is not an excuse.

Cheers,
Ben.




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