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xen-devel
Re: [Xen-devel] [RFC] Auto rebind PCI devices
* If the device specificed in the config is bound *and*
pci-force-rebind is set, then unbind it from the existing driver and
rebind it to pciback, then start the domain.
That sounds awkward. What's the use case you see in mind from stealing
devices from a domain while it's running?
If a driver in domain 0 has grabbed a device but isn't actually doing
anything useful with it I can't start a domU without explicitly unbinding.
Rather than having to do the unbind (or add it to rc.local, or whatever)
it's somewhat convenient to have Xend trust my domU device allocations as
being correct and override this binding. It won't steal from another domU,
however.
I see switching force-rebind off by default as being a "safety catch":
it'll stop new users for PCI passthrough from shooting themselves in the
foot.
When force-rebind is on, the behaviour is suitable either for an
experienced administrator with a known working config (I'd think they're
not going to change PCI device allocations often) or for config files
generated by some other management tool (which can do safety checks when
allocating the device). In either of these cases, the user is confident
that rebinding is the correct thing to do, and can let Xend do it
automatically.
For what it's worth, we'll be looking soon at creating IOMMU IO spaces
for devices automatically when they're granted to domains.
That would be way cool. :-)
Cheers,
Mark
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