Since I promised to test on Natty too:

VM host details:
AMD Phenom(tm) II X6 1100T Processor
$ lsb_release -sd
Ubuntu 11.04
$ uname -srvm
Linux 2.6.38-12-generic #51-Ubuntu SMP Wed Sep 28 14:27:32 UTC 2011 x86_64
$ dpkg -l | egrep 'qemu|libvirt|bios'
ii  libvirt-bin             0.8.8-1ubuntu6.5            the programs for the 
libvirt library
ii  libvirt0                0.8.8-1ubuntu6.5            library for interfacing 
with different virtualization systems
ii  python-libvirt          0.8.8-1ubuntu6.5            libvirt Python bindings
ii  qemu-arm-static         0.12.5+noroms-0ubuntu7.2    dummy transitional 
package for qemu-kvm-extras-static
ii  qemu-common             0.14.0+noroms-0ubuntu4.4    qemu common 
functionality (bios, documentation, etc)
ii  qemu-keymaps            0.14.50-2011.03-1-0ubuntu2  QEMU keyboard maps
ii  qemu-kvm                0.14.0+noroms-0ubuntu4.4    Full virtualization on 
i386 and amd64 hardware
ii  qemu-kvm-extras         0.14.50-2011.03-1-0ubuntu2  QEMU system and user 
mode emulation (transitional package)
ii  qemu-kvm-extras-static  0.14.50-2011.03-1-0ubuntu2  QEMU static user mode 
emulation binaries (transitional package)
ii  qemu-system             0.14.50-2011.03-1-0ubuntu2  QEMU full system 
emulation binaries
ii  qemu-user               0.14.50-2011.03-1-0ubuntu2  QEMU user mode 
emulation binaries
ii  qemu-user-static        0.14.50-2011.03-1-0ubuntu2  QEMU user mode 
emulation binaries (static version)
ii  qemulator               0.5-3.2ubuntu1              a solution for easy 
setup and management of qemu
ii  seabios                 0.6.1.2-0ubuntu1            legacy BIOS 
implementation which can be used as a coreboot payload
ii  vgabios                 0.6c-2ubuntu3               VGA BIOS software for 
the Bochs and Qemu emulated VGA card

VM guest details:
32-bit RHEL 5 compatible Qemu/KVM guest, really Scientific Linux 5.7. The guest 
was built from SL.57.090911.DVD.i386.disc1.iso plus today's updates.
With 1 CPU it boots fine.
With 2 CPUs it hangs.
See attached screenshot of virt-manager plus virt-top.  The disk and network 
activity in virt-top are always zeros when the VM is hung while the CPU 
activity is high.  Note VM host has 6-cpu cores so 5.7% CPU is averaged across 
them. Regular /usr/bin/top shows /usr/bin/kvm getting 100% for this guest while 
it is hug.


** Attachment added: "screenshot of hung VM guest on 2.6.38-12 Natty host"
   
https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/795717/+attachment/2581649/+files/OPSI-1720.png

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https://bugs.launchpad.net/bugs/795717

Title:
  32bit rhel and centos 5.(5|6) hangs on boot on natty

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