[PATCH 0/3] arm64: Fix cpuidle with pseudo-NMI enabled

[Marc Zyngier]

It appears that although cpu_do_idle() is correctly dealing with the
PMR/DAIF duality, the PSCI cpu-suspend code has been left unaware of
it.

On a system that uses PSCI for idle (such as the Ampere Altra I have
access to), the kernel dies as soon as it enters idle (interrupts are
off at the GIC CPU interface level). Boo.

Instead of spreading more magic code around, I've elected to provide a
pair of helpers (arm_cpuidle_{save,restore}_context()) which do the
heavy lifting.

With that in place, I can finally boot the above system with
irqchip.gicv3_pseudo_nmi=1. I'd welcome feedback from people who may
have experienced similar issues in the past (and on different
machines).

Marc Zyngier (3):
  arm64: Add cpuidle context save/restore helpers
  arm64: Convert cpu_do_idle() to using cpuidle context helpers
  PSCI: Use cpuidle context helpers in psci_cpu_suspend_enter()

 arch/arm/include/asm/cpuidle.h   |  5 ++++
 arch/arm64/include/asm/cpuidle.h | 35 +++++++++++++++++++++++++++
 arch/arm64/kernel/process.c      | 41 +++++++-------------------------
 drivers/firmware/psci/psci.c     |  5 ++++
 4 files changed, 54 insertions(+), 32 deletions(-)

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2.30.2