FreeBSD/doc ef8f6cc (r52827)en_US.ISO8859-1/books/handbook/virtualization chapter.xml

A few changes to the Xen setup:

1) The line
    sysrc -f /etc/sysctl.conf vm.max_wired=-1
does not work, it only returns an error about a name containing characters
not allowed in shell. Instead, use echo to add the line to sysctl.conf.

2) Fix the rules for automatic bridge creation, taken from the bridging
chapter of the handbook.

3) Add a note that FreeBSD's Dom0 requires booting in legacy (BIOS) mode.

4) Remove mention of xen.4th for the loader menu. It's not working anymore
with the Lua loader that we have now. Until this is fixed, don't refer
readers to it.

Thanks to royger@ for providing the patch.

Submitted by:   royger@
Approved by:    me
Differential Revision:  https://reviews.freebsd.org/D19294
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