[Xen-devel] [PATCH v4 0/3] add hypercall option to temporarily pin a vcpu

[Juergen Gross <jgross@xxxxxxxx>]

Some hardware (e.g. Dell studio 1555 laptops) require SMIs to be
called on physical cpu 0 only. Linux drivers like dcdbas or i8k try
to achieve this by pinning the running thread to cpu 0, but in Dom0
this is not enough: the vcpu must be pinned to physical cpu 0 via
Xen, too.

This patch series enhances xen tools to cope with new reactions of
the hypervisor due to the new feature.

Changes in V4:
- removed patches 1-3 (hypervisor patches) as already accepted
- patch 1 (was 4): minor code modifications as suggested by Dario Faggioli
- patch 3 (was 6): change "force" variable to bool as suggested by 
  Dario Faggioli
- patch 3 (was 6): add #define to libxl indicating availability of
  libxl_set_vcpuaffinity_force() as requested by Wei Liu
- patch 3 (was 6): add force option to xl man page as requested by 
  Dario Faggioli

Changes in V3:
- removed old patch 1 as already accepted
- new patch 1 to correct error in cpupool_unassign_cpu_helper()
- patch 2: adjust coding style as requested by Jan Beulich
- patch 2: rename pin_temp to pin_override as requested by Jan Beulich and
  suggested by David Vrabel
- patch 2: change return type of do_pin_temp() to int as requested by
  Jan Beulich
- patch 2: swap error checks in do_sched_op() as requested by Jan Beulich
- patch 2: adjust comment in xen/include/public/sched.h as requested by
  Jan Beulich
- new patch 3 to add possibility in hypervisor to undo pin override via tools
- patch 4 (was 3): adjust coding style as requested by Wei Liu
- new patch 5 to  print message how to recover from xl cpupool-cpu-remove
  errors
- new patch 6 to undo pin override via xl vcpu-pin (force option)

Changes in V2:
- add patch 1 to silence messages on suspend/resume
- add patch 3 to handle EBUSY case when removing cpu from cpupool
- limit operation to hardware domain as suggested by Jan Beulich
- some style issues corrected as requested by Jan Beulich
- use fixed width types in interface as requested by Jan Beulich
- add compat layer checking as requested by Jan Beulich


Juergen Gross (3):
  libxc: do some retries in xc_cpupool_removecpu() for EBUSY case
  libxl: print message how to recover from xl cpupool-cpu-remove errors
  libxl: add force option for xl vcpu-pin

 docs/man/xl.pod.1         |  7 ++++++-
 tools/libxc/xc_cpupool.c  | 20 +++++++++++++++++++-
 tools/libxl/libxl.c       | 31 +++++++++++++++++++++++++------
 tools/libxl/libxl.h       | 10 ++++++++++
 tools/libxl/xl_cmdimpl.c  | 32 +++++++++++++++++++++++++++-----
 tools/libxl/xl_cmdtable.c |  3 ++-
 6 files changed, 89 insertions(+), 14 deletions(-)

Cc: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
-- 
2.6.2


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