Bug#599200: base-installer: Install amd64 kernel on i686 kvm guest - and fail to boot

[Petter Reinholdtsen <pere@hungry.com>]

[Lennart Sorensen]
> I suspect if you run kvm with the -cpu option you can specify what
> you desire.  I believe the default is to simply match whatever the
> host has, so if the host has a 64bit cpu, then the guest will too.

Well, the host is using a 32-bit kernel too, so 64-bit kvm with
hardware virtualization is not really an option.

meta:/# kvm -cpu ?
x86           qemu64
x86           phenom
x86         core2duo
x86           qemu32
x86          coreduo
x86              486
x86          pentium
x86         pentium2
x86         pentium3
x86           athlon
x86             n270
meta:/#

This is the command line for the kvm instance in question:

  /usr/bin/kvm -S -M pc -m 512 -smp 1 -name pxetest
    -uuid 9b733365-92e6-6b1f-7ad6-8a4f0caf6bfc
    -monitor unix:/var/lib/libvirt/qemu/pxetest.monitor,server,nowait -boot c
    -drive file=/var/lib/libvirt/images/pxetest.img,if=ide,bus=0,unit=0,boot=on
    -drive file=/var/lib/libvirt/debian-edu-amd64-i386-DVD-squeeze-test.iso,if=ide,media=cdrom,bus=1,unit=0
    -net nic,macaddr=54:52:00:68:97:39,vlan=0,name=net0
    -net tap,fd=48,vlan=0,name=hostnet0
    -net nic,macaddr=52:54:00:04:a3:34,vlan=1,name=net1
    -net tap,fd=49,vlan=1,name=hostnet1 -serial pty -parallel none
    -usb -usbdevice tablet -vnc 127.0.0.1:6 -k en-us -vga cirrus
    -soundhw es1370

Anyone know how to detect 32-bits kvm virtual machines on a 32-bits
host on a CPU capable of running 64-bit kernels?  Can we just look at
the vendor_id, model name, cpu family and model settings and disable
amd64 as an option if these are listed:

  vendor_id       : GenuineIntel
  cpu family      : 6
  model           : 2
  model name      : QEMU Virtual CPU version 0.10.0

Happy hacking,
-- 
Petter Reinholdtsen