[CentOS] Xen cpu requirements

I'm installing Centos 5.5 on a new Dell R301 server.  I wanted to run Xen
and have the full virtualization possibilities (this is our development
support server, so it runs a few real services and is available for
playing with things; putting the "playing with things" functions into
virtual servers would protect the "few real services", and make it easier
to clean up afterwards).

I have enabled virtualization support in the BIOS.

/proc/cpuinfo says I have
model name      : Intel(R) Xeon(R) CPU           X3450  @ 2.67GHz

and

flags           : fpu tsc msr pae cx8 apic mtrr cmov pat clflush acpi mmx
fxsr sse sse2 ss ht syscall nx lm constant_tsc ida pni est ssse3 cx16
sse4_1 sse4_2 popcnt lahf_lm

The "vmx" flag doesn't appear to be set.

(I'm working from
<http://www.centos.org/docs/5/html/Virtualization-en-US/ch-op-sys-support.html>,
by the way; I note that document is from 2007 or maybe even 2006, so
perhaps some things aren't fully up-to-date.)

So, does that mean my Xeon-based server doesn't have hardware
virtualization assistance?

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