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[virt-tools-list] [PATCH 0/2 virt-what] Fix detection of Xen HVM guest on IA64 (RHBZ#707508)



The following two patches fix some instances of detecting Xen HVM
guests running on IA64.

Xen can be detected relatively easily if PV-on-HVM drivers are
installed, because these drivers create /sys/bus/xen directory.  This
is only done if all other Xen tests have failed, so this shouldn't
affect the PV or dom0 case, or non-IA64 arches at all.

However if these have not been installed, then there's not a very easy
test for this.  We fall back to using a timing attack, and if that
indicates that rdtsc is being unusually slow, then we print the single
fact "virt".  Note that this is only done on IA64.

I tested the patched virt-what on:

 - Xen RHEL 5.7 dom0 IA64 
 - Xen RHEL 5.7 domU HVM IA64 (note: with PV drivers installed)
 - baremetal Fedora x86_64

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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