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Description of problem:
As we discussed with developer in a email libguestfs backend mode UML will not be supported on RHEL. So features should be removed or disabled in libguestfs on RHEL. In case of UML information maybe removed for the man page, i have checked the following man page contain UML info:
guestfs(3), guestfish(1), libguestfs(3), guestfs-performance(1), guestfs-release-notes(1), virt-builder(1), virt-sysprep(1), virt-what(1), Sys::Guestfs(3pm), Sys::Virt::Error(3pm)


Version-Release number of selected component (if applicable):
libguestfs-1.27.48-1.1.el7

How reproducible:
100%


Steps to Reproduce:

Actual results:

Expected results:

Additional info:

This is a RHEL 7 only patch:

https://github.com/libguestfs/libguestfs/commit/f19f2847b7ae15e629d66c6d2dc53128d0826419

After applying this patch you should see:

$ LIBGUESTFS_BACKEND=uml guestfish -a /dev/null run
libguestfs: error: launch: In RHEL, only the 'libvirt' or 'direct' method is supported.
In particular, User-Mode Linux (UML) is not supported.

Verified with libguestfs-tools-c-1.28.1-1.2.el7

Steps to verify:
# export LIBGUESTFS_BACKEND=uml
# guestfish -a /dev/null run
libguestfs: error: launch: In RHEL, only the 'libvirt' or 'direct' method is supported.
In particular, User-Mode Linux (UML) is not supported.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-0303.html