libvirt users - May 2010 - Issues after migrating from Xen to KVM

Dear list,

I have moved my HVMs from xen to kvm and it worked well except some 
problems using virsh.

First, one OpenSolaris HVM does boot with warnings:

WARNING: /pci at 0,0/pci1af4,1100 at 1,2 (uhci1): No SOF interrupts have been 
received, this USB UHCI host controller is unusable*

*The corresponding process:

/usr/bin/qemu-system-x86_64 -S -M pc-0.12 -enable-kvm -m 1024 -smp 
1,sockets=1,cores=1,threads=1 \
                                              -name server01 -uuid 
e382c360-23bd-b400-0b89-9a1e69613ec4 -nographic \
                                              -nodefaults -chardev 
socket,id=monitor,path=/usr/local/libvirt/var/lib/libvirt/qemu/server01.monitor,server,nowait
\
                                              -mon 
chardev=monitor,mode=readline -rtc base=utc -boot c -drive 
file=/dev/xen_vol/xen_opensol,if=none,id=drive-ide0-0-0,boot=on \
                                              -device 
ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive 
file=/dev/hde,if=none,id=drive-ide0-0-1 \
                                              -device 
ide-drive,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1 -device 
rtl8139,vlan=0,id=net0,mac=00:16:3e:28:85:7a,bus=pci.0,addr=0x4 \
                                              -net 
tap,ifname=tap0,vlan=0,name=hostnet0 -chardev pty,id=serial0 -device 
isa-serial,chardev=serial0 -usb -device 
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3

This does not happen when I boot with plain qemu-bin:

/usr/local/kvm/bin/qemu-system-x86_64 -hda /dev/xen_vol/xen_opensol \
                                                              -hdb 
/dev/hde -net nic,macaddr=00:16:3e:28:85:7a \
                                                              -net 
tap,ifname=tap0 -nographic \
                                                              -m 1024 
-daemonize

Second is one Centos 5.2 HVM that does not boot at all.
However when I boot manually and omitt "-S" and
"-nodefaults" then it
comes up.

I looked for the -S option and I wonder why it is being used by default.
Can anybody help me? I cannot see any further documentation about the 
"-nodefault" option and how to disable "-S"
Best regards

Ralf

On 05/01/2010 02:56 PM, Ralf Hornik Mailings wrote:
> Dear list,
> 
> I have moved my HVMs from xen to kvm and it worked well except some
> problems using virsh.
> 
> First, one OpenSolaris HVM does boot with warnings:
> 
> WARNING: /pci at 0,0/pci1af4,1100 at 1,2 (uhci1): No SOF interrupts have
been
> received, this USB UHCI host controller is unusable*
> 
> *The corresponding process:
> 
> /usr/bin/qemu-system-x86_64 -S -M pc-0.12 -enable-kvm -m 1024 -smp
> 1,sockets=1,cores=1,threads=1 \
>                                              -name server01 -uuid
> e382c360-23bd-b400-0b89-9a1e69613ec4 -nographic \
>                                              -nodefaults -chardev
>
socket,id=monitor,path=/usr/local/libvirt/var/lib/libvirt/qemu/server01.monitor,server,nowait
> \
>                                              -mon
> chardev=monitor,mode=readline -rtc base=utc -boot c -drive
> file=/dev/xen_vol/xen_opensol,if=none,id=drive-ide0-0-0,boot=on \
>                                              -device
> ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive
> file=/dev/hde,if=none,id=drive-ide0-0-1 \
>                                              -device
> ide-drive,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1 -device
> rtl8139,vlan=0,id=net0,mac=00:16:3e:28:85:7a,bus=pci.0,addr=0x4 \
>                                              -net
> tap,ifname=tap0,vlan=0,name=hostnet0 -chardev pty,id=serial0 -device
> isa-serial,chardev=serial0 -usb -device
> virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3
> 
> This does not happen when I boot with plain qemu-bin:
> 
> /usr/local/kvm/bin/qemu-system-x86_64 -hda /dev/xen_vol/xen_opensol \
>                                                              -hdb
> /dev/hde -net nic,macaddr=00:16:3e:28:85:7a \
>                                                              -net
> tap,ifname=tap0 -nographic \
>                                                              -m 1024
> -daemonize
> 
> Second is one Centos 5.2 HVM that does not boot at all.
> However when I boot manually and omitt "-S" and
"-nodefaults" then it
> comes up.
> 
> I looked for the -S option and I wonder why it is being used by default.
> Can anybody help me? I cannot see any further documentation about the
> "-nodefault" option and how to disable "-S"
The -S means "start suspended".  That's so that libvirt can fork
off the
qemu process, do a bit of work, and then run the virtual machine.  In
general you can't remove it from the command-line libvirt generates, since
libvirt depends on it.

Also, with recent qemu, you don't really want to remove the -nodefaults
either,
since it's another new feature that libvirt is coming to rely on.  The
reasons
for using it are many, but basically it says not to create any devices by
default, but let the user specify all of them on the command-line.

What's the actual problem you are having with the CentOS guest?  What kind
of
error messages do you see?

-- 
Chris Lalancette