Fedora Core 6 Xen Virtualization Guide
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Para-virtualized guests

Any x86_64, or ia64 CPU is supported for running para-virtualized guests. To run i386 guests requires a CPU with the PAE extension. Many older laptops (particularly those based on Pentium Mobile / Centrino) do not have PAE support. To determine if a CPU has PAE support, run the following command:

• $ grep pae /proc/cpuinfo
  flags           : fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow up ts
  

The above output shows a CPU that does have PAE support. If the command returns nothing, then the CPU does not have PAE support.

• New PAE Requirement for i386 Guests. Previous versions of the Xen kernel did not require PAE support. This change will affect laptop users.

Fedora Core 6 Xen Virtualization Guide
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