[PATCH v3 0/3] KVM: PPC: BookE: Fix boot hang on preemptible kernels

[Shrikanth Hegde <sshegde@linux.ibm.com>]

Christian Zigotzky had reported that preemptible kernels don't boot on
his FSL Cyrus+ board. The board freezes on running either full/lazy
preemption and has been an issue for a while now (years!).

https://lore.kernel.org/all/b897b0fd-90f2-4215-bcd4-3714e497d773@xenosoft.de/#t
More details in cover-letter of v2[1]

v2->v3:
- Comment removal (Mukesh Kumar Chaurasiya)
- Add missing booke change (Sashiko)
- Collect tags (Thanks to Mukesh Kumar Chaurasiya, Christian Zigotzky)

v1->v2:
- Re-order to avoid preempt count dance (Narayana Murty N)
- Do only hard_irq_disable on PPC64 to avoid second warning. On PPC32
  use local_irq_disable to acheive the same. (Ritesh Harjani)

v2: https://lore.kernel.org/all/20261110053238.3794500-1-sshegde@linux.ibm.com/#t [1]

Apologies in case any nitpicks are missed.
I'm surviving on half a night's sleep these days.

As said in v2, remaining usecases of hard_irq_disable will be taken up
later.

Shrikanth Hegde (3):
  powerpc/irq: Add ppc_hard_irq_disable()
  KVM: PPC: BookE: Load FP and Altivec before enabling the interrupts
  KVM: PPC: Use ppc_hard_irq_disable before guest entry

 arch/powerpc/include/asm/hw_irq.h | 17 +++++++++++++++++
 arch/powerpc/kvm/booke.c          |  6 ++----
 arch/powerpc/kvm/powerpc.c        | 14 +++-----------
 3 files changed, 22 insertions(+), 15 deletions(-)

-- 
2.52.0