[PATCH 0/6] Enable doorbell instruction for POWER8 CPUs

[Matheus Ferst]

Reviewing the interrupt rework patch series, Fabiano noted[1] that the
POWER8 User's Manual lists the Directed Hypervisor Doorbell interrupt,
even without implementing the "Embedded.Processor Control" category. The
manual also lists the msgclr and msgsnd instructions, but the decode
legacy code currently gates them with the PPC2_PRCNTL flag, which is not
enabled for this CPU.

Reading the Power ISA v2.07, we noticed that the title of the
Processor Control chapter does not include the category information like
in Power ISA v2.06, and the instruction listing in the appendices says
that their category is "S\nE.PC". The document is not clear about this
notation, but since implementations should support only one environment
(embedded or server), I'd interpret this change as "these instructions
are now available if the processor implements the server environment or
E.PC category."

While reviewing the flag for those instructions, we also saw that the
msgsync, introduced in PowerISA v3.0, was available on all processors
with the PPC2_PRCNTL flag, which includes older CPUs like e500mc and
e6500.

This patch series fixes the instruction flags for these three
instructions. We then take this opportunity to move processor control
instruction to decodetree, fixing an embarrassing error in the
definition of the REQUIRE_HV macro along the way.

[1] https://lists.gnu.org/archive/html/qemu-ppc/2022-09/msg00586.html

Matheus Ferst (6):
  target/ppc: fix msgclr/msgsnd insns flags
  target/ppc: fix msgsync insns flags
  target/ppc: fix REQUIRE_HV macro definition
  target/ppc: move msgclr/msgsnd to decodetree
  target/ppc: move msgclrp/msgsndp to decodetree
  target/ppc: move msgsync to decodetree

 target/ppc/insn32.decode                      |   8 ++
 target/ppc/translate.c                        |  86 ++-------------
 .../ppc/translate/processor-ctrl-impl.c.inc   | 103 ++++++++++++++++++
 3 files changed, 119 insertions(+), 78 deletions(-)
 create mode 100644 target/ppc/translate/processor-ctrl-impl.c.inc

-- 
2.25.1