[PATCH 00/12] xen: drop hypercall function tables

[Juergen Gross <jgross@xxxxxxxx>]

In order to avoid indirect function calls on the hypercall path as
much as possible this series is removing the hypercall function tables
and is replacing the hypercall handler calls via the function array
by automatically generated switch statements.

Another by-product of generating the switch statements is the
automatic generating of the hypercall handler prototypes from the
same data base which is used to generate the switch.

This has the additional advantage of using type safe calls of the
handlers and to ensure related handler (e.g. PV and HVM ones) share
the same prototypes.

A very brief performance test (parallel build of the Xen hypervisor
in a 6 vcpu guest) showed a very slim improvement (less than 1%) of
the performance with the patches applied. The test was performed using
a PV and a PVH guest.

Juergen Gross (12):
  xen: limit number of hypercall parameters to 5
  xen: move do_vcpu_op() to arch specific code
  xen: harmonize return types of hypercall handlers
  xen/x86: modify hvm_memory_op() prototype
  xen: don't include asm/hypercall.h from C sources
  xen: generate hypercall interface related code
  xen: use generated prototypes for hypercall handlers
  x86/pv-shim: don't modify hypercall table
  xen/x86: don't use hypercall table for calling compat hypercalls
  xen/x86: call hypercall handlers via switch statement
  xen/arm: call hypercall handlers via switch statement
  xen/x86: add hypercall performance counters for hvm, correct pv

 .gitignore                               |   2 +
 xen/Makefile                             |  10 +
 xen/arch/arm/domain.c                    |  15 +-
 xen/arch/arm/hvm.c                       |   3 +-
 xen/arch/arm/physdev.c                   |   2 +-
 xen/arch/arm/platform_hypercall.c        |   6 +-
 xen/arch/arm/traps.c                     | 124 +++--------
 xen/arch/x86/compat.c                    |  14 +-
 xen/arch/x86/cpu/vpmu.c                  |   1 +
 xen/arch/x86/domain.c                    |  11 +-
 xen/arch/x86/domctl.c                    |   4 +-
 xen/arch/x86/hvm/hypercall.c             | 172 ++------------
 xen/arch/x86/hypercall.c                 |  59 -----
 xen/arch/x86/mm.c                        |   1 -
 xen/arch/x86/mm/paging.c                 |   3 +-
 xen/arch/x86/platform_hypercall.c        |   6 +-
 xen/arch/x86/pv/callback.c               |  20 +-
 xen/arch/x86/pv/emul-priv-op.c           |   2 +-
 xen/arch/x86/pv/hypercall.c              | 188 ++--------------
 xen/arch/x86/pv/iret.c                   |   5 +-
 xen/arch/x86/pv/misc-hypercalls.c        |  14 +-
 xen/arch/x86/pv/shim.c                   |  48 ++--
 xen/arch/x86/traps.c                     |   2 +-
 xen/arch/x86/x86_64/compat.c             |   1 -
 xen/arch/x86/x86_64/compat/mm.c          |   1 +
 xen/arch/x86/x86_64/domain.c             |  16 +-
 xen/arch/x86/x86_64/mm.c                 |   1 -
 xen/arch/x86/x86_64/platform_hypercall.c |   9 +-
 xen/common/argo.c                        |  12 +-
 xen/common/compat/domain.c               |  14 +-
 xen/common/compat/grant_table.c          |   1 +
 xen/common/compat/multicall.c            |   2 +-
 xen/common/domain.c                      |  11 +-
 xen/common/event_channel.c               |  10 +
 xen/common/grant_table.c                 |  10 +
 xen/common/kexec.c                       |   6 +-
 xen/common/multicall.c                   |   1 +
 xen/common/trace.c                       |   2 +-
 xen/include/asm-arm/hypercall.h          |   7 +-
 xen/include/asm-x86/hypercall.h          | 195 +++-------------
 xen/include/asm-x86/paging.h             |   3 -
 xen/include/asm-x86/pv/shim.h            |   3 +
 xen/include/hypercall-defs.c             | 272 +++++++++++++++++++++++
 xen/include/xen/hypercall.h              | 181 +--------------
 xen/scripts/gen_hypercall.awk            | 228 +++++++++++++++++++
 45 files changed, 769 insertions(+), 929 deletions(-)
 create mode 100644 xen/include/hypercall-defs.c
 create mode 100644 xen/scripts/gen_hypercall.awk

-- 
2.26.2