[libvirt-users] Issues after migrating from Xen to KVM

[Ralf Hornik Mailings]

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