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[PATCH 0/4] target/ppc: TCG SMT support for spapr
From: |
Nicholas Piggin |
Subject: |
[PATCH 0/4] target/ppc: TCG SMT support for spapr |
Date: |
Mon, 5 Jun 2023 21:23:19 +1000 |
Previous RFC here
https://lists.gnu.org/archive/html/qemu-ppc/2023-05/msg00453.html
This series drops patch 1 from the previous, which is more of
a standalone bugfix.
Also accounted for Cedric's comments, except a nicer way to
set cpu_index vs PIR/TIR SPRs, which is not quite trivial.
This limits support for SMT to POWER8 and newer. It is also
incompatible with nested-HV so that is checked for too.
Iterating CPUs to find siblings for now I kept because similar
loops exist in a few places, and it is not conceptually
difficult for SMT, just fiddly code to improve. For now it
should not be much performane concern.
I removed hypervisor msgsnd support from patch 3, which is not
required for spapr and added significantly to the patch.
For now nobody has objected to the way shared SPR access is
handled (serialised with TCG atomics support) so we'll keep
going with it.
Thanks,
Nick
Nicholas Piggin (4):
target/ppc: Add initial flags and helpers for SMT support
target/ppc: Add support for SMT CTRL register
target/ppc: Add msgsndp and DPDES SMT support
spapr: Allow up to 8 threads SMT on POWER8 and newer
hw/ppc/ppc.c | 6 ++++
hw/ppc/spapr.c | 16 +++++++---
hw/ppc/spapr_caps.c | 14 ++++++++
hw/ppc/spapr_cpu_core.c | 7 ++--
include/hw/ppc/ppc.h | 1 +
target/ppc/cpu.h | 9 ++++++
target/ppc/cpu_init.c | 5 +++
target/ppc/excp_helper.c | 30 ++++++++++++++---
target/ppc/gdbstub.c | 2 +-
target/ppc/helper.h | 2 ++
target/ppc/misc_helper.c | 69 ++++++++++++++++++++++++++++++++++++----
target/ppc/translate.c | 46 ++++++++++++++++++++++++++-
12 files changed, 188 insertions(+), 19 deletions(-)
--
2.40.1
- [PATCH 0/4] target/ppc: TCG SMT support for spapr,
Nicholas Piggin <=
- [PATCH 1/4] target/ppc: Add initial flags and helpers for SMT support, Nicholas Piggin, 2023/06/05
- [PATCH 2/4] target/ppc: Add support for SMT CTRL register, Nicholas Piggin, 2023/06/05
- [PATCH 3/4] target/ppc: Add msgsndp and DPDES SMT support, Nicholas Piggin, 2023/06/05
- [PATCH 4/4] spapr: Allow up to 8 threads SMT on POWER8 and newer, Nicholas Piggin, 2023/06/05
- Re: [PATCH 0/4] target/ppc: TCG SMT support for spapr, Cédric Le Goater, 2023/06/06