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

[Daniel P. Berrange]

On Thu, Nov 14, 2013 at 12:48:51PM +1300, Christian Gagneraud wrote:
> 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!

FYI you don't need to undefine+define - you can just use 'virsh edit <name>'
to change it interactively in vi / emacs / etc

Regards,
Daniel
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