Avi Kivity wrote: > On 06/15/2009 03:52 PM, Anthony Liguori wrote: >> Avi Kivity wrote: >>> On 06/15/2009 03:41 PM, Michael S. Tsirkin wrote: >>>> We should just tell the user which slots are open. >>>> This might be tricky if the config is passed in with the command >>>> line >>>> flags. >>> >>> qemu -show-available-pci-slots >> >> Why does the user care? >> >> Let QEMU allocate the PCI slot, then query it to see what slot it >> assigned and remember that. > > It's a roundabout way of doing things.
Having libvirt do PCI slot allocation scares me. It assumes we can return a whitelist of available slots, and then let libvirt just randomly assign things. There's knowledge though in slot assignment that's board-specific. For instance, depending on how many LNK lines you have, you may want to put things in slots in such a way to optimize interrupt balancing or something like that. Some platforms have quirks about expecting a particular slot to have a particular device. It's still an optimal device but it has to be in that slot. You can't really express that via an available slot list. > Non-virtio, as well. But we can't make that the default, so the user > will have to specify this anyway. > > Given that you can't hotunplug individual functions, the user will > have to specify exactly how functions are aggregated into devices. My > recommendation would be for a GUI to allow the user to select a 'quad > port virtio NIC' or 'dual port virtio scsi controller' rather than > trying to do anything automatic. Yeah, I haven't thought much about that. Regards, Anthony Liguori _______________________________________________ Virtualization mailing list [email protected] https://lists.linux-foundation.org/mailman/listinfo/virtualization
