--- Begin Message ---
Subject: |
Re: [EXTERNAL] Re: [Qemu-devel] how to dynamically add a block device using qmp? |
Date: |
Mon, 13 Oct 2014 12:28:51 -0700 |
User-agent: |
Mutt/1.5.18 (2008-05-17) |
Markus,
Nevermind my previous question, I see now that you add a scsi bus prior to
adding the scsi disk.
However, I did this and qmp returned {[]} in both cases and I am still not
seeing the disk in the vm.
here's the qmp session:
{"execute":"qmp_capabilities"}
{"return": {}}
{ "execute": "blockdev-add",
"arguments": { "options" : {
"id": "tc1",
"driver": "qcow2",
"file": { "driver": "file",
"filename": "/home/kchiang/kvmimages/xpsp2_b-02222012.qc2" } } } }
{"return": {}}
{ "execute": "device_add", "arguments": {
"driver": "virtio-scsi-pci", "id": "vs-hba" } }
{"return": {}}
{ "execute": "device_add", "arguments": {
"driver": "scsi-disk", "id": "sdb", "drive": "tc1",
"bus": "vs-hba.0" } }
{"return": {}}
{ "execute": "query-block" }
{"return": [{"io-status": "ok", "device": "ide0-hd0", "locked": false,
"removable": false, "inserted": {"iops_rd": 0, "image": {"virtual-size":
5999951872, "filename": "kvmimages/vts-6g-u12-inetsim.image", "format": "raw",
"actual-size": 5999955968, "dirty-flag": false}, "iops_wr": 0, "ro": false,
"backing_file_depth": 0, "drv": "raw", "iops": 0, "bps_wr": 0, "encrypted":
false, "bps": 0, "bps_rd": 0, "file": "kvmimages/vts-6g-u12-inetsim.image",
"encryption_key_missing": false}, "type": "unknown"}, {"io-status": "ok",
"device": "ide1-cd0", "locked": false, "removable": true, "tray_open": false,
"type": "unknown"}, {"device": "floppy0", "locked": false, "removable": true,
"tray_open": false, "type": "unknown"}, {"device": "sd0", "locked": false,
"removable": true, "tray_open": false, "type": "unknown"}, {"io-status": "ok",
"device": "tc1", "locked": false, "removable": false, "inserted": {"iops_rd":
0, "image": {"virtual-size": 5368709120, "filename":
"/home/kchiang/kvmimages/xpsp2_b-02222012.qc2", "cluster-size": 65536,
"format": "qcow2", "actual-size": 1550454784, "format-specific": {"type":
"qcow2", "data": {"compat": "0.10"}}, "dirty-flag": false}, "iops_wr": 0, "ro":
false, "backing_file_depth": 0, "drv": "qcow2", "iops": 0, "bps_wr": 0,
"encrypted": false, "bps": 0, "bps_rd": 0, "file":
"/home/kchiang/kvmimages/xpsp2_b-02222012.qc2", "encryption_key_missing":
false}, "type": "unknown"}]}
am I missing anything else?
I've also tried rebooting the VM and running rescan-scsi-bus to no avail.
Ken
On Sat, Oct 11, 2014 at 10:58:59AM +0200, Markus Armbruster wrote:
> Ken Chiang <address@hidden> writes:
>
> > Hello,
> >
> > I am trying to add a block device dynamically using qmp and are having
> > some issues.
> >
> > After successfully adding the block device using "blockdev-add" and
> > verifying that it has been added using "query-block", I am unable to
> > see the block device in the VM under /dev/sdXX
>
> Block devices consist of a frontend (a.k.a. device model) and a backend.
> You added only a backend. To add the frontend, use device_add.
>
> > I am using ubuntu14.04LTS: qmp version:
> > {"QMP": {"version": {"qemu": {"micro": 0, "minor": 0, "major": 2},
> > "package": " (Debian 2.0.0+dfsg-2ubuntu1.2)"}, "capabilities": []}}
> >
> > Here's what I am doing:
> > 1. /usr/bin/kvm-spice -hda kvmimages/ubuntu.image -m 768 -usbdevice tablet
> > -vnc :5 -qmp tcp:localhost:4444,server,nowait
> >
> > 2. telnet localhost 4444
> >
> > 3. In the telnet session run:
> > {"execute":"qmp_capabilities"}
> > {"return": {}}
> > { "execute": "blockdev-add",
> > "arguments": { "options" : {
> > "id": "disk1",
> > "driver": "qcow2",
> > "file": { "driver": "file",
> > "filename": "testvm.qc2" } } } }
> > {"return": {}}
> >
> > { "execute": "query-block" }
> >
> > 4. query-block returns the device "disk1", but when I check the vm:
> > # vncviewer :5
> >
> > there are no new devices.
>
> For a virtio-blk disk, try:
>
> { "execute": "device_add", "arguments": {
> "driver": "virtio-blk-pci", "id": "vda", "drive": "disk1" } }
>
> For a SCSI disk, try:
>
> { "execute": "device_add", "arguments": {
> "driver": "virtio-scsi-pci", "id": "vs-hba" } }
> { "execute": "device_add", "arguments": {
> "driver": "scsi-disk", "id": "sda", "drive": "disk1",
> "bus": "vs-hba.0" } }
>
> [...]
--
Ken Chiang
Information Assurance
Sandia National Labs - CA
925-294-2018
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