[PATCH v3 0/6] add hypercall option to temporarily pin a vcpu

[Juergen Gross <jgross@suse.com>]

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 adds a stable hypercall option to achieve this. And
adds several related corrections and add-ons.

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 (6):
  xen, cpupool: correct error handling when removing cpu from cpupool
  xen: add hypercall option to override and restore vcpu affinity
  xen: add force flag to xen_domctl_vcpuaffinity for undoing pin
    override
  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

 tools/libxc/xc_cpupool.c     | 13 ++++++-
 tools/libxl/libxl.c          | 31 ++++++++++++---
 tools/libxl/libxl.h          |  4 ++
 tools/libxl/xl_cmdimpl.c     | 33 +++++++++++++---
 tools/libxl/xl_cmdtable.c    |  3 +-
 xen/common/compat/schedule.c |  4 ++
 xen/common/cpupool.c         | 18 ++++++---
 xen/common/domctl.c          |  6 +++
 xen/common/schedule.c        | 93 +++++++++++++++++++++++++++++++++++++++++---
 xen/include/public/domctl.h  |  3 ++
 xen/include/public/sched.h   | 17 ++++++++
 xen/include/xen/sched.h      |  1 +
 xen/include/xlat.lst         |  1 +
 13 files changed, 203 insertions(+), 24 deletions(-)

Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Dario Faggioli <dario.faggioli@citrix.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: George Dunlap <george.dunlap@eu.citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
-- 
2.6.2


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