Hi! For the pseries platform (server PPC64) we do not support PCI hotplug yet. However we still want to hot plug disks.
As a workaround, we could add multiple SCSI host devices (virtio-scsi-pci, spapr-vscsi) without any disk attached and later (using qemu console) attach drives to them as we do with the "-drive" parameter in the command line. So I enabled CONFIG_PCI_HOTPLUG_OLD=y and tried. However, drive_add console command works only with PCI what eliminates "spapr-vscsi" from the list. Oookay. Then I tried running qemu with "-device virtio-scsi-pci,id=device0" and later doing "drive_add 0 file=virtimg/test1" from the qemu console. This time qemu responded with "Device is not a SCSI adapter" what is correct as nowadays virtio-XXXX-pci devices are not what are they called as they simply create underlying virtio-bus, attach a real virtio-XXXX-device there (which is not PCI) and only then attach disk to non-PCI virtio device. So as I see there is no way to attach a disk to an existing controller in already running qemu. This is how I add disks to qemu now: -device virtio-scsi-pci,id=virtioscsi0 \ -drive file=virtimg/fc18guest,if=none,id=drive0,readonly=off, format=raw,media=disk,werror=stop,rerror=stop \ -device scsi-disk,id=scsidisk0,bus=virtioscsi0.0,channel=0, scsi-id=0,lun=0,drive=drive0,removable=off \ I want to only add "-device virtio-scsi-pci,id=virtioscsi0" to the command line and do the rest from the qemu console. Am I missing some useful command from qemu console or anything else? Thanks! -- Alexey
