Making Xen utilize all cores

[Mayuresh <mayuresh%acm.org@localhost>]

This is on NetBSD 6.1 i386 Dom0 and Linux DomU.

The CPU column shows only 2 CPUs. This is actually a quad core processor.

# xl vcpu-list
Failed to read config file: /usr/pkg/etc/xen/xl.conf: No such file or
directory
Name                                ID  VCPU   CPU State   Time(s) CPU
Affinity
Domain-0                             0     0    0   r--     383.8  any cpu
Domain-0                             0     1    -   --p       0.0  any cpu
Domain-0                             0     2    -   --p       0.0  any cpu
Domain-0                             0     3    -   --p       0.0  any cpu
domu-linux                           1     0    3   -b-     121.2  any cpu

Shouldn't Xen be using all CPUs by default? What setting am I missing to
make Xen do so?

Mayuresh.