VT-x on Via Nano

[MWNZ]

I have a Via Nano (Isaiah Core) host (Epia VB8001) running Ubuntu 9.04 AMD64 and am using it with a WinXP guest. The guest starts but is very slow (unsurprising given the slowness of the CPU). However, I would like to try to get some acceleration from the VT-x feature in this processor. It has the vmx flag set (see cpuinfo below)

When starting the guest and looking in the logs, I get the following message:

HWACCM: No VT-x or AMD-V CPU extension found. Reason VERR_HWACCM_UNKNOWN_CPU 
HWACCM: VMX MSR_IA32_FEATURE_CONTROL=0

As I understand it the CPU has licensed the VT-x technology from Intel. Is there anything more that needs to be installed to make this work?

Thanks in advance.
Regards
Mark

CPUINFO:

processor	: 0
vendor_id	: CentaurHauls
cpu family	: 6
model		: 15
model name	: VIA Nano processor L2200@1600MHz
stepping	: 2
cpu MHz		: 1615.683
fpu		: yes
fpu_exception	: yes
cpuid level	: 10
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov 
pat clflush acpi mmx fxsr sse sse2 ss tm pbe syscall nx fxsr_opt rdtscp lm const
ant_tsc rep_good pni monitor vmx est tm2 ssse3 cx16 xtpr lahf_lm
bogomips	: 3231.36
clflush size	: 64
cache_alignment	: 128
address sizes	: 40 bits physical, 48 bits virtual
power management:

[elc]

VIA / Centaur messed up. You have a stepping 2 processor, which doesn't have working VMX.

See http://marc.info/?l=kvm&m=123861829901077