[PATCH v9 0/4] Display IO topology when PXM data is available (plus some cleanup)

[Boris Ostrovsky <boris.ostrovsky@oracle.com>]

Changes in v9:
* Re-work patch 3 to make set_xen_guest_handle_offset() take buffer offset in number of
elements, not bytes
* Update error printing in patch 4.

Changes in v8:
* Change sysctl's pcitopo interface such that if device is not found then XEN_INVALID_DEV
  is returned in nodes array. Changes to patches 1 and 5.
* Get rid of first_dev and use num_devs in xen_sysctl_pcitopoinfo  as an OUT argument
  that reports how many devices have been processed. Changes to patches 1 and 5.
  -- Add set_xen_guest_handle_offset macro to help toolstack handle this (new patch 4)
* Replace LOGEV with LOGE (patches 2, 3, 5)

Changes in v7:
* Allow one of arguments to NUMA info sysctls to be NULL, in which case only
  the non-NULL buffer will be filled in by hypervisor (patches 1 and 4)
* Properly handle -ENODEVS in PCI topology sysctl (patch 2)
* Error handling changes in patch 5

Changes in v6:
* PCI topology interface changes: no continuations, userspace will be dealing
  with "unfinished" sysctl (patches 2 and 5)
* Unknown device will cause ENODEV in sysctl
* No NULL tests in libxc
* Loop control initialization fix (similar to commit 26da081ac91a)
* Other minor changes (see per-patch notes)

Changes in v5:
* Make CPU topology and NUMA info sysctls behave more like XEN_DOMCTL_get_vcpu_msrs
  when passed NULL buffers. This required toolstack changes as well
* Don't use 8-bit data types in interfaces
* Fold interface version update into patch#3

Changes in v4:
* Split cputopology and NUMA info changes into separate patches
* Added patch#1 (partly because patch#4 needs to know when when distance is invalid,
  i.e. NUMA_NO_DISTANCE)
* Split sysctl version update into a separate patch
* Other changes are listed in each patch
* NOTE: I did not test python's xc changes since I don't think I know how.

Changes in v3:
* Added patch #1 to more consistently define nodes as a u8 and properly
  use NUMA_NO_NODE.
* Make changes to xen_sysctl_numainfo, similar to those made to
  xen_sysctl_topologyinfo. (Q: I kept both sets of changes in the same
  patch #3 to avoid bumping interface version twice. Perhaps it's better
  to split it into two?)
* Instead of copying data for each loop index allocate a buffer and copy
  once for all three queries in sysctl.c.
* Move hypercall buffer management from libxl to libxc (as requested by
  Dario, patches #5 and #6).
* Report topology info for offlined CPUs as well
* Added LIBXL_HAVE_PCITOPO macro

Changes in v2:
* Split topology sysctls into two --- one for CPU topology and the other
  for devices
* Avoid long loops in the hypervisor by using continuations. (I am not
  particularly happy about using first_dev in the interface, suggestions
  for a better interface would be appreciated)
* Use proper libxl conventions for interfaces
* Avoid hypervisor stack corruption when copying PXM data from guest



A few patches that add interface for querying hypervisor about device
topology and allow 'xl info -n' display this information if PXM object
is provided by ACPI.

This series also makes some optimizations and cleanup of current CPU
topology and NUMA sysctl queries.

Boris Ostrovsky (4):
  libxl/libxc: Move libxl_get_cpu_topology()'s hypercall buffer
    management to libxc
  libxl/libxc: Move libxl_get_numainfo()'s hypercall buffer management
    to libxc
  libxc: Provide set_xen_guest_handle_offset macro
  libxl: Add interface for querying hypervisor about PCI topology

 tools/libxc/include/xenctrl.h     |   26 ++++++--
 tools/libxc/xc_misc.c             |   92 ++++++++++++++++++++++----
 tools/libxl/libxl.c               |  131 ++++++++++++++++++++----------------
 tools/libxl/libxl.h               |   12 ++++
 tools/libxl/libxl_freebsd.c       |   12 ++++
 tools/libxl/libxl_internal.h      |    5 ++
 tools/libxl/libxl_linux.c         |   70 ++++++++++++++++++++
 tools/libxl/libxl_netbsd.c        |   12 ++++
 tools/libxl/libxl_types.idl       |    7 ++
 tools/libxl/libxl_utils.c         |    8 ++
 tools/libxl/xl_cmdimpl.c          |   40 +++++++++--
 tools/misc/xenpm.c                |   51 ++++++--------
 tools/python/xen/lowlevel/xc/xc.c |   58 ++++++----------
 13 files changed, 374 insertions(+), 150 deletions(-)