[v5,00/17] Enable CONFIG_VMAP_STACK on PPC32

Message

Christophe Leroy Dec. 21, 2019, 8:32 a.m. UTC

The purpose of this serie is to enable CONFIG_VMAP_STACK on PPC32.

rfc v1: initial support on 8xx

rfc v2: added stack overflow detection.

v3:
- Stack overflow detection works, tested with LKDTM STACK_EXHAUST test
- Support for book3s32 added

v4:
- Fixed build failure with CONFIG_KVM (patch 14)
- Fixed boot failure with pmac32_defconfig+VMAP_STACK+KVM (new patch 15)
- Fixed crash with altivec and fpu (patch 16)

v5:
- Reduced ifdefs around tophys/tovirt by using macros (patch 5)
- Reorganised stack overflow handling, making it independent of the existing one which could go away in another series (patch 7)
- Added vmapped stacks for interrupts (new patch 8)

Christophe Leroy (17):
  powerpc/32: replace MTMSRD() by mtmsr
  powerpc/32: Add EXCEPTION_PROLOG_0 in head_32.h
  powerpc/32: save DEAR/DAR before calling handle_page_fault
  powerpc/32: move MSR_PR test into EXCEPTION_PROLOG_0
  powerpc/32: add a macro to get and/or save DAR and DSISR on stack.
  powerpc/32: prepare for CONFIG_VMAP_STACK
  powerpc: align stack to 2 * THREAD_SIZE with VMAP_STACK
  powerpc/32: Add early stack overflow detection with VMAP stack.
  powerpc/32: Use vmapped stacks for interrupts
  powerpc/8xx: Use alternative scratch registers in DTLB miss handler
  powerpc/8xx: drop exception entries for non-existing exceptions
  powerpc/8xx: move DataStoreTLBMiss perf handler
  powerpc/8xx: split breakpoint exception
  powerpc/8xx: Enable CONFIG_VMAP_STACK
  powerpc/32s: reorganise DSI handler.
  powerpc/32s: avoid crossing page boundary while changing SRR0/1.
  powerpc/32s: Enable CONFIG_VMAP_STACK

 arch/powerpc/include/asm/processor.h   |   6 ++
 arch/powerpc/include/asm/thread_info.h |  18 ++++
 arch/powerpc/kernel/asm-offsets.c      |   6 ++
 arch/powerpc/kernel/entry_32.S         |  29 +++---
 arch/powerpc/kernel/fpu.S              |   3 +
 arch/powerpc/kernel/head_32.S          |  61 ++++++-----
 arch/powerpc/kernel/head_32.h          | 178 +++++++++++++++++++++++++++----
 arch/powerpc/kernel/head_40x.S         |   2 +
 arch/powerpc/kernel/head_8xx.S         | 184 +++++++++++++++------------------
 arch/powerpc/kernel/head_booke.h       |   2 +
 arch/powerpc/kernel/head_fsl_booke.S   |   1 +
 arch/powerpc/kernel/irq.c              |  22 ++++
 arch/powerpc/kernel/setup.h            |   2 +-
 arch/powerpc/kernel/setup_32.c         |  17 ++-
 arch/powerpc/kernel/setup_64.c         |   2 +-
 arch/powerpc/kernel/traps.c            |   9 ++
 arch/powerpc/kernel/vector.S           |   3 +
 arch/powerpc/kernel/vmlinux.lds.S      |   2 +-
 arch/powerpc/mm/book3s32/hash_low.S    |  46 ++++++---
 arch/powerpc/mm/book3s32/mmu.c         |   9 +-
 arch/powerpc/perf/8xx-pmu.c            |  12 ++-
 arch/powerpc/platforms/Kconfig.cputype |   3 +
 22 files changed, 435 insertions(+), 182 deletions(-)