New archtecture support in xfstests-bld

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Hey Ritesh,

I just pulled some changes from Eric Biggers into xfstests-bld which
has a start on adding riscv64 support to kvm-xfstests.  So far, he's
updated libaio to a newer upstream version (newer is relative; the
"new" version was last updated six years ago :-) for better RiscV
support, and he's added RiscV support to set_canonicalized_arch().

I'd recommend that you start with the latest upstream version of
xfstests-bld, and then add support for powerpcle64 by adding support
to find_kernel_to_use() in run=fstests/util/parse_opt_funcs, and
set_cross_compile() and get_kernel_file_info() in
run-fstests/util-arch, since those changes in the 2/2 patch series[1]
were clearly correct.  (And Eric, you should take a look at those
changes[1] for RiscV support.)

[1] https://lore.kernel.org/all/eb1f8f0fb0ff9a6358129a2a45bd0c88421ac669.1696965271.git.ritesh.list@xxxxxxxxx/

I'd also encourage you to add support for the new architectures in
selftests/appliance, since that will exercise building a kernel for
the foreign architecture using cross-compilation, and then using
qemu-system-$ARCH from kvm-xfstests.

(Yes, kvm-xfstests is starting to get very much misnamed; but kvm is
easier to type, and autocompletes much more nicely than qemu-<tab>.
The string "kvm" also is sprinkled all over the xfstests-bld scripts,
and I'm not convinced it's worth changing.  That being said, I've
added a qemu-xfstests script which gets installed into the user's bin
directory; we'll see if that is something people feel strongly about
using the new name.)

Finally, since have two separate efforts to add support for new
architectures to xfstests-bld, might I prevail on you to keep some
notes about what's needed to bootstrap a new architecture?  That might
be helpful for some future developer.

Many thanks!

					- Ted




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