Cannot start xend: ERROR Internal error: Could not lock memory for Xen hypercall (35 = Resource temporarily unavailabl)

[Stephane Bortzmeyer <stephane%sources.org@localhost>]

First experience with NetBSD as a Dom0. The Dom0 starts but no DomU
works.

I bvelieve I followed exactly
<http://www.netbsd.org/ports/xen/howto.html>. The NetBSD Dom0 boots
and runs fine. But xend cannot start:

golgoth:pkg/etc/rc.d % sudo sh -x ./xend start
...
+ mkdir -p /var/run/xend
+ mkdir -p /var/run/xend/boot
+ mkdir -p /var/run/xenstored
+ eval echo Starting xend. && 
PATH=/home/stephane/bin:/local/sbin:/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/sbin:/usr/sbin:/usr/pkg/bin:/usr/pkg/sbin:/usr/pkg/sbin
 /usr/pkg/sbin/xend start
+ echo Starting xend.
Starting xend.
+ 
PATH=/home/stephane/bin:/local/sbin:/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/sbin:/usr/sbin:/usr/pkg/bin:/usr/pkg/sbin:/usr/pkg/sbin
 /usr/pkg/sbin/xend start
ERROR Internal error: Could not lock memory for Xen hypercall (35 = Resource 
temporarily unavailabl)
+ [ -z  ]
+ return 1

The machine is a noname PC (32bits) with NetBSD 5. uname -a reports:

NetBSD golgoth 5.0 NetBSD 5.0 (XEN3_DOM0) #0: Sun Apr 26 19:06:57 UTC 2009  
builds%b6.netbsd.org@localhost:/home/builds/ab/netbsd-5-0-RELEASE/i386/200904260229Z-obj/home/builds/ab/netbsd-5-0-RELEASE/src/sys/arch/i386/compile/XEN3_DOM0
 i386

Xen comes from a package. pkg_info reports:

xentools3-3.1.4nb4  Userland Tools for Xen
xenkernel3-3.1.4nb3 Xen3 Kernel