These are rebased patches leftover from the unmerged bit of
the idle series.
Based on feedback, I dropped one of the KVM patches, and reworked
the code a bit so it is easier to restore the ability for KVM to
grab secondaries into real mode.
I did a bit more benchmarking, and all up these patches improve 2
CPU ping-pong context switch benchmark on a POWER9 by around 4-6%
(depending on what CPUs and idle states are used).
Nicholas Piggin (4):
KVM: PPC: Book3S HV: POWER9 does not require secondary thread
management
powerpc/64s: idle POWER9 can execute stop without a sync sequence
powerpc/64s: idle POWER9 can execute stop in virtual mode
powerpc/64s: idle ESL=0 stop can avoid MSR and save/restore overhead
arch/powerpc/include/asm/cpuidle.h | 16 -----
arch/powerpc/include/asm/kvm_book3s_asm.h | 4 ++
arch/powerpc/kernel/idle_book3s.S | 103 ++++++++++++++++++++++--------
arch/powerpc/kvm/book3s_hv.c | 14 +++-
arch/powerpc/kvm/book3s_hv_rmhandlers.S | 8 +++
5 files changed, 101 insertions(+), 44 deletions(-)
--
2.13.3
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