[Xen-devel] [PATCH RFC 0/2] Support for hwloc

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

These two patches have been developed in combination with a Xen pluging for
hwloc, to allow a toolstack domain to gather the system topology rather than
the virtual topology.

An experimental hwloc branch can be found here:

   git://xenbits.xen.org/people/andrewcoop/hwloc.git hwloc-xen-topology-v5
   
http://xenbits.xen.org/gitweb/?p=people/andrewcoop/hwloc.git;a=shortlog;h=refs/heads/hwloc-xen-topology-v5

and depends on these two patches to function.

Patch 1 is extending xc_{topology,numa}info() functions to include a version
which performs correct hypercall bounce buffering.

Patch 2 introduced SYSCTL_xen_cpuid which allows a toolstack to perform
arbitrary cpuid instructions on specific physical cpus.  hwloc uses this to
enumerate the cpuid cache leaves without resorting to tactics of pinning vcpus
to specific pcpus and running native cpuid.

Comments welcome,

~Andrew

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