[PATCH v2 00/21] arm64: Move overflow sp into SP_EL1 and kernel sp into SP_EL0

[Will Deacon]

Hi folks,

This is version two of the kernel stack juggling patches I previously
posted here:

  https://lore.kernel.org/r/20260907164247.17223-1-will@kernel.org

Changes since v1 include:
  * Fixed suspend/resume paths to handle the stack pointers properly
  * Fixed restoration of ptrauth keys on resume
  * Added tags

Cheers,

Will

Cc: Arnd Bergmann <arnd at arndb.de>
Cc: Ard Biesheuvel <ardb at kernel.org>
Cc: Ada Couprie Diaz <ada.coupriediaz at arm.com>
Cc: David Hildenbrand <david at kernel.org>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Vladimir Murzin <vladimir.murzin at arm.com>
Cc: Mark Rutland <mark.rutland at arm.com>
Cc: Mostafa Saleh <smostafa at google.com>
Cc: Lorenzo Stoakes <ljs at kernel.org>
Cc: Oliver Upton <oupton at kernel.org>
Cc: Linus Walleij <linusw at kernel.org>
Cc: Marc Zyngier <maz at kernel.org>

--->8

Mostafa Saleh (1):
  KVM: arm64: Protect TPIDRRO_EL0 across guest entry/exit

Will Deacon (20):
  arm64: entry: Defer setting of TPIDRRO_EL0 until exit to userspace
  arm64: entry: Only check for stack overflow on exceptions from EL1
  arm64: stackprotector: Temporarily disable per-task stackprotector
  arm64: bpf: Add support for generating reads of TPIDRRO_EL0
  arm64: Store 'current' in TPIDRRO_EL0 instead of SP_EL0
  selftests/bpf: arm64: Use TPIDRRO_EL0 instead of SP_EL0 for 'current'
  scripts/gdb: arm64: Use TPIDRRO_EL0 instead of SP_EL0 for 'current'
  arm64: stackprotector: Re-enable per-task stackprotector
  arm64: percpu: Specialise set_my_cpu_offset() for the primary CPU
  arm64: percpu: Annotate __kern_my_cpu_offset() as '__always_inline'
  KVM: arm64: Preserve handler/thread bit of EL1 mode in
    __finalise_el2()
  arm64: sdei: Guard most of asm/sdei.h with CONFIG_ARM_SDE_INTERFACE
  arm64: sdei: Support SDEI events from kernel handler and thread modes
  arm64: entry: Point SP_EL0 at the overflow stack
  arm64: entry: Implement EL1t exception handlers for overflow stack
  arm64: entry: Use SPSel to switch to overflow stack
  arm64: entry: Split up kernel_ventry macro into separate helper macros
  arm64: entry: The great stack switcheroo
  arm64: tracing: Advertise a mode of EL1t in synthetic kernel regs
  arm64: Rename 'overflow_stack' and OVERFLOW_STACK_SIZE

 arch/arm64/Kconfig                            |   2 +-
 arch/arm64/Makefile                           |   2 +-
 arch/arm64/include/asm/assembler.h            |   2 +-
 arch/arm64/include/asm/current.h              |   6 +-
 arch/arm64/include/asm/ftrace.h               |   4 +-
 arch/arm64/include/asm/insn.h                 |   1 +
 arch/arm64/include/asm/kvm_asm.h              |  26 +++++
 arch/arm64/include/asm/memory.h               |  10 +-
 arch/arm64/include/asm/percpu.h               |  10 +-
 arch/arm64/include/asm/perf_event.h           |   2 +-
 arch/arm64/include/asm/sdei.h                 |   2 +
 arch/arm64/include/asm/stacktrace.h           |   9 +-
 arch/arm64/include/asm/stacktrace/nvhe.h      |   3 +-
 arch/arm64/include/uapi/asm/ptrace.h          |   1 +
 arch/arm64/kernel/asm-offsets.c               |   2 +
 arch/arm64/kernel/entry-common.c              |  51 +++++++--
 arch/arm64/kernel/entry.S                     | 108 +++++++++---------
 arch/arm64/kernel/head.S                      |   8 +-
 arch/arm64/kernel/hyp-stub.S                  |   7 +-
 arch/arm64/kernel/process.c                   |  21 +---
 arch/arm64/kernel/sdei.c                      |   6 +-
 arch/arm64/kernel/sleep.S                     |   3 +-
 arch/arm64/kernel/smp.c                       |  19 ++-
 arch/arm64/kernel/stacktrace.c                |   2 +-
 arch/arm64/kernel/sys_compat.c                |   7 --
 arch/arm64/kernel/traps.c                     |  14 +--
 arch/arm64/kvm/hyp/entry.S                    |  15 ++-
 arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h    |   2 -
 arch/arm64/kvm/hyp/nvhe/host.S                |   2 +-
 arch/arm64/kvm/hyp/nvhe/stacktrace.c          |   4 +-
 arch/arm64/kvm/stacktrace.c                   |   4 +-
 arch/arm64/mm/proc.S                          |  16 ++-
 arch/arm64/net/bpf_jit.h                      |   2 +
 arch/arm64/net/bpf_jit_comp.c                 |   4 +-
 scripts/gdb/linux/cpus.py                     |   2 +-
 .../selftests/bpf/progs/verifier_jit_inline.c |   2 +-
 36 files changed, 230 insertions(+), 151 deletions(-)

-- 
2.55.0.1082.g2b9226bbc0-goog