My experiments with hot-attaching virtio disks to eucalyptus VMs have
been partially successful. I've been able to attach/detach a virtio
disk to/from a VM once, but the second attach causes a kvm segfault
followed by a libvirtd segfault. Removing eucalyptus from the scenario,
this problem can be reproduced by passing the attach/detach/attach
commands directly using virsh as follows. Note that, although i'm using
an AOE device as the 'source' in the following example, the same problem
exists if you replace the source dev with a local file.
r...@sg:~# ps ax | grep kvm
25947 ? Sl 0:10 /usr/bin/kvm -S -M pc-0.11 -m 128 -smp 1 -name
i-3D7E06DF -uuid 8f09357d-c295-523b-97fa-b72e0a46497b -nographic -monitor
unix:/var/run/libvirt/qemu/i-3D7E06DF.monitor,server,nowait -boot c -kernel
/var/lib/eucalyptus/instances/admin/i-3D7E06DF/kernel -initrd
/var/lib/eucalyptus/instances/admin/i-3D7E06DF/ramdisk -append root=/dev/sda1
console=ttyS0 -drive file=/var/lib/eucalyptus/instances/admin/i-3D7E06D
/disk,if=scsi,index=0,boot=on -net
nic,macaddr=d0:0d:3d:7e:06:df,vlan=0,model=e1000,name=e1000.0 -net
tap,fd=17,vlan=0,name=tap.0 -serial
file:/var/lib/eucalyptus/instances/admin/i-3D7E06DF/console.log -parallel none
-usb
r...@sg:~# cat meh
<disk type='block'><driver name='virtio'/><source
dev='/dev/etherd/e0.7'/><target dev='vda' bus='virtio'/></disk>
r...@sg:~# virsh list
Connecting to uri: qemu:///system
Id Name State
----------------------------------
1 i-3D7E06DF running
r...@sg:~# virsh attach-device 1 meh
Connecting to uri: qemu:///system
Device attached successfully
r...@sg:~# virsh detach-device 1 meh
Connecting to uri: qemu:///system
Device detached successfully
r...@sg:~# virsh attach-device 1 meh
Connecting to uri: qemu:///system
error: Failed to attach device from meh
error: server closed connection
[44227.486821] kvm[25947]: segfault at 8d0 ip 000000000041ccd7 sp
00007fff99644d70 error 6 in qemu-system-x86_64[400000+226000]
[44227.730408] libvirtd[25467]: segfault at 70 ip 00000000004345a2 sp
00007f5b3f5e3b70 error 4 in libvirtd[400000+77000]
Am I perhaps passing an incorrectly formatted disk XML for virtio?
Versions:
Host:
r...@sg:~# apt-cache policy libvirt-bin
libvirt-bin:
Installed: 0.7.0-1ubuntu10
Candidate: 0.7.0-1ubuntu10
Version table:
*** 0.7.0-1ubuntu10 0
500 http://us.archive.ubuntu.com karmic/main Packages
100 /var/lib/dpkg/status
r...@sg:~# apt-cache policy qemu-kvm
qemu-kvm:
Installed: 0.11.0-0ubuntu1
Candidate: 0.11.0-0ubuntu1
Version table:
*** 0.11.0-0ubuntu1 0
500 http://us.archive.ubuntu.com karmic/main Packages
100 /var/lib/dpkg/status
r...@sg:~# uname -a
Linux sg 2.6.31-12-server #41-Ubuntu SMP Wed Oct 7 20:33:27 UTC 2009 x86_64
GNU/Linux
Guest:
r...@ubuntu:~# uname -a
Linux ubuntu 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17 01:58:03 UTC 2009
x86_64 GNU/Linux
--
dynamic block device attach/detach not functional with karmic KVM
https://bugs.launchpad.net/bugs/432154
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