* [Qemu-devel] how to dynamically add a block device using qmp?
[not found] <mailman.0.1412981747.30924.qemu-devel@nongnu.org>
@ 2014-10-10 23:52 ` Ken Chiang
2014-10-11 6:11 ` Fam Zheng
2014-10-11 8:58 ` Markus Armbruster
0 siblings, 2 replies; 3+ messages in thread
From: Ken Chiang @ 2014-10-10 23:52 UTC (permalink / raw)
To: qemu-devel
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
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.
I thought that maybe it is a hotplug SATA bug detailed here:
http://ubuntuforums.org/showthread.php?t=1998055
but running:
#rescan-scsi-bus resulted in no new block devices.
Thanks for any help!
Ken
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] how to dynamically add a block device using qmp?
2014-10-10 23:52 ` [Qemu-devel] how to dynamically add a block device using qmp? Ken Chiang
@ 2014-10-11 6:11 ` Fam Zheng
2014-10-11 8:58 ` Markus Armbruster
1 sibling, 0 replies; 3+ messages in thread
From: Fam Zheng @ 2014-10-11 6:11 UTC (permalink / raw)
To: Ken Chiang; +Cc: qemu-devel
On Fri, 10/10 16:52, Ken Chiang wrote:
> 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
>
> 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" }
This is only the backend part. You need "device-add" command to add a guest
visible frontend device, and specify the type (ide, scsi, etc..).
Thansk,
Fam
>
> 4. query-block returns the device "disk1", but when I check the vm:
> # vncviewer :5
>
> there are no new devices.
>
> I thought that maybe it is a hotplug SATA bug detailed here:
> http://ubuntuforums.org/showthread.php?t=1998055
>
> but running:
> #rescan-scsi-bus resulted in no new block devices.
>
> Thanks for any help!
>
> Ken
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] how to dynamically add a block device using qmp?
2014-10-10 23:52 ` [Qemu-devel] how to dynamically add a block device using qmp? Ken Chiang
2014-10-11 6:11 ` Fam Zheng
@ 2014-10-11 8:58 ` Markus Armbruster
1 sibling, 0 replies; 3+ messages in thread
From: Markus Armbruster @ 2014-10-11 8:58 UTC (permalink / raw)
To: Ken Chiang; +Cc: qemu-devel
Ken Chiang <kchiang@sandia.gov> 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" } }
[...]
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2014-10-11 8:59 UTC | newest]
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2014-10-10 23:52 ` [Qemu-devel] how to dynamically add a block device using qmp? Ken Chiang
2014-10-11 6:11 ` Fam Zheng
2014-10-11 8:58 ` Markus Armbruster
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