[PATCH v3 0/4] VSX 32-byte vector paired load/store instructions

[Balamuruhan S <bala24@linux.ibm.com>]

VSX vector paired instructions operates with octword (32-byte) operand
for loads and stores between storage and a pair of two sequential Vector-Scalar
Registers (VSRs). There are 4 word instructions and 2 prefixed instructions
that provides this 32-byte storage access operations - lxvp, lxvpx, stxvp,
stxvpx, plxvpx, pstxvpx.

Emulation infrastructure doesn't have support for these instructions, to
operate with 32-byte storage access and to operate with 2 VSX registers.
This patch series enables the instruction emulation support and adds test
cases for them respectively.

Changes in v3:
-------------
Worked on review comments and suggestions from Ravi and Naveen,

* Fix the do_vsx_load() to handle vsx instructions if MSR_FP/MSR_VEC
  cleared in exception conditions and it reaches to read/write to
  thread_struct member fp_state/vr_state respectively.
* Fix wrongly used `__vector128 v[2]` in struct vsx_reg as it should
  hold a single vsx register size.
* Remove unnecessary `VSX_CHECK_VEC` flag set and condition to check
  `VSX_LDLEFT` that is not applicable for these vsx instructions.
* Fix comments in emulate_vsx_load() that were misleading.
* Rebased on latest powerpc next branch.

Changes in v2:
-------------
* Fix suggestion from Sandipan, wrap ISA 3.1 instructions with
  cpu_has_feature(CPU_FTR_ARCH_31) check.
* Rebase on latest powerpc next branch.

Balamuruhan S (4):
  powerpc/sstep: support new VSX vector paired storage access
    instructions
  powerpc/sstep: support emulation for vsx vector paired storage access
    instructions
  powerpc ppc-opcode: add encoding macros for vsx vector paired
    instructions
  powerpc sstep: add testcases for vsx load/store instructions

 arch/powerpc/include/asm/ppc-opcode.h |  17 ++
 arch/powerpc/lib/sstep.c              | 122 +++++++++++--
 arch/powerpc/lib/test_emulate_step.c  | 252 ++++++++++++++++++++++++++
 3 files changed, 374 insertions(+), 17 deletions(-)


base-commit: 71d7bca373d5fa0ec977ca4814f49140621bd7ae
-- 
2.24.1