[libvirt-users] How to tell libvirt not to use qemu "accel=kvm" for a FreeBSD guest

[Christian Gagneraud]

On 14/11/13 10:53, Christian Gagneraud wrote:
> Hi there,
>
> I have used qemu to install FreeBSD 9.2 release, and i can boot it fine
> with:
> $ qemu-system-x86_64 -hda images/FreeBSD-9.2-RELEASE-amd64.img
>
> I then made virsh aware of my brand new VM (see attached XML), but when
> i run it via virsh, It hangs after the bootloader whith this message:
> Booting...
> CPU doesn't support long mode
>
>  From the log, here is the generated qemu command:
> LC_ALL=C
> PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin
> /usr/bin/qemu-system-x86_64 -name fbsd92-amd64 -S -machine
> pc-i440fx-1.5,accel=kvm,usb=off -m 512 -realtime mlock=off -smp
> 1,sockets=1,cores=1,threads=1 -uuid 11ae165e-b8a2-5083-fb77-37c0042725bf
> -nographic -no-user-config -nodefaults -chardev
> socket,id=charmonitor,path=/var/lib/libvirt/qemu/fbsd92-amd64.monitor,server,nowait
> -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc
> -no-shutdown -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive
> file=/home/christiaga/projects/vms/images/FreeBSD-9.2-RELEASE-amd64.img,if=none,id=drive-ide0-0-0,format=raw
> -device
> ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1
> -netdev tap,fd=24,id=hostnet0 -device
> rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:9c:94:3b,bus=pci.0,addr=0x3
> -chardev pty,id=charserial0 -device
> isa-serial,chardev=charserial0,id=serial0 -device
> virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4
>
> After many attempts, I pinned down the problem. To be able to boot the
> machine with the above command, I had to remove:
> * the accel=kvm in -machine
> * the -S (to "autostart" the VM)
> And change the -net tap,fd=24 to -net user,id=...
>
> So basically, the only thing i would like to tell libvirt is not to use
> accel=kvm, i guess the FreeBSD kernel is missing some feature (is it
> this PAE thing?)
>
> Does anyone how can i tell libvirt to do that?

Answering myself, replace <domain type='kvm'> with <domain type='qemu'>, 
virsh undefine <label>, virsh define <xml-file>, et voila!
So far it seems to do the job, at least It boots, now i'm configuring 
the network, finger crossed! ;)

Chris

>
> regards,
> Chris
>