I could not reproduce booting the guest by setting processor affinity to
a single host CPU.

1. Start 32-bit 2-CPU RHEL-5 compatible VM guest and pause on grub screen
2. locked it to host CPU #1
$ sudo taskset -p 0x00000001 3127
pid 3127's current affinity mask: 3f
pid 3127's new affinity mask: 1
3. Let the guest proceed booting from grub and it hung at a different time, 
right after displaying:
Time: kvm-clock clocksource has been installed.

gdahlman probably mean single guest CPU not single host CPU.

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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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