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From: | Frederic Konrad |
Subject: | Re: [Qemu-devel] [QEMU question] Disk hot plugging without working PCI hotplug - possible? |
Date: | Thu, 06 Jun 2013 16:29:43 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130311 Thunderbird/17.0.4 |
On 06/06/2013 15:59, Alexey Kardashevskiy wrote:
On 06.06.2013 22:44, Frederic Konrad wrote:On 06/06/2013 12:13, Alexey Kardashevskiy wrote: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.Hi, Seems it's a bug: il should be compatible with the old virtio-scsi-pci. What's the meaning of the "0" in drive_add command?It is a PCI slot number, the complete address would include a domain and a bus.
Ok thanks, I'll take a look.
FredSo 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 \
This two last command isn't available in the monitor?
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!
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