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[PATCH 0/2] ppc: add support for Directed Privileged Doorbell (non-hyper

From: Cédric Le Goater
Subject: [PATCH 0/2] ppc: add support for Directed Privileged Doorbell (non-hypervisor)
Date: Thu, 9 Jan 2020 17:33:44 +0100


The Processor Control facility POWER8 processors and later provides a
mechanism for the hypervisor to send messages to other threads in the
system (msgsnd instruction) and cause hypervisor-level exceptions.

Privileged non-hypervisor programs can also send messages (msgsndp
instruction) but are restricted to the threads of the same
subprocessor and cause privileged-level exceptions. The Directed
Privileged Doorbell Exception State (DPDES) register reflects the
state of pending privileged-level doorbell exceptions for all threads
and can be used to modify that state.

If the MSGP facility is not in the HFSCR, a hypervisor facility
unavailable exception is generated when these instructions are used or
when the DPDES register is accessed by the supervisor.

Based on previous work from Suraj Jitindar Singh. I took ownership due
to the amount of changes.


Cédric Le Goater (2):
  target/ppc: Add privileged message send facilities
  target/ppc: add support for Hypervisor Facility Unavailable Exception

 target/ppc/cpu.h                |  7 +++
 target/ppc/helper.h             |  4 ++
 target/ppc/excp_helper.c        | 81 ++++++++++++++++++++++++++++-----
 target/ppc/misc_helper.c        | 63 +++++++++++++++++++++++++
 target/ppc/translate.c          | 26 +++++++++++
 target/ppc/translate_init.inc.c | 20 ++++++--
 6 files changed, 186 insertions(+), 15 deletions(-)


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