[V7,00/12] riscv: Add GENERIC_ENTRY support and related features

Message

Guo Ren Oct. 15, 2022, 11:46 a.m. UTC

From: Guo Ren <[e-mail]>

The patches convert riscv to use the generic entry infrastructure from
kernel/entry/*. Additionally, add independent irq stacks (IRQ_STACKS)
for percpu to prevent kernel stack overflows. Add generic_entry based
STACKLEAK support.

You can directly try it with:
[1] https://github.com/guoren83/linux/tree/generic_entry_v7

v7:
 - Fixup regs_irqs_disabled with SR_PIE
 - Optimize stackleak_erase -> stackleak_erase_on_task_stack (Thx Mark
   Rutland)
 - Add BUG_ON(!irqs_disabled()) in trap handlers
 - Using regs_irqs_disabled in __do_page_fault
 - Remove unnecessary irq disable in ret_from_exception and add comment 

v6:
https://lore.kernel.org/linux-riscv/[e-mail]/
 - Use THEAD_SIZE_ORDER for thread size adjustment in kconfig (Thx Arnd)
 - Move call_on_stack to inline style (Thx Peter Zijlstra)
 - Fixup fp chain broken (Thx Chen Zhongjin)
 - Remove common entry modification, and fixup page_fault entry (Thx
   Peter Zijlstra)
 - Treat some traps as nmi entry (Thx Peter Zijlstra)

v5:
https://lore.kernel.org/linux-riscv/[e-mail]/
 - Add riscv own stackleak patch instead of generic entry modification
   (by Mark Rutland)
 - Add EXPERT dependency for THREAD_SIZE (by Arnd)
 - Add EXPERT dependency for IRQ_STACK (by Sebastian, David Laight)
 - Corrected __trap_section (by Peter Zijlstra)
 - Add Tested-by (Yipeng Zou)
 - Use CONFIG_SOFTIRQ_ON_OWN_STACK replace "#ifndef CONFIG_PREEMPT_RT"
 - Fixup systrace_enter compile error
 - Fixup exit_to_user_mode_prepare preempt_disable warning

V4:
https://lore.kernel.org/linux-riscv/[e-mail]/
 - Fixup entry.S with "la" bug (by Conor.Dooley)
 - Fixup missing noinstr bug (by Peter Zijlstra)

V3:
https://lore.kernel.org/linux-riscv/[e-mail]/
 - Fixup CONFIG_COMPAT=n compile error
 - Add THREAD_SIZE_ORDER config
 - Optimize elf_kexec.c warning fixup
 - Add static to irq_stack_ptr definition

V2:
https://lore.kernel.org/linux-riscv/[e-mail]/
 - Fixup compile error by include "riscv: ptrace: Remove duplicate
   operation"
 - Fixup compile warning
   Reported-by: kernel test robot <[e-mail]>
 - Add test repo link in cover letter

V1:
https://lore.kernel.org/linux-riscv/[e-mail]/

Dao Lu (1):
  riscv: Add support for STACKLEAK gcc plugin

Guo Ren (9):
  riscv: elf_kexec: Fixup compile warning
  riscv: compat_syscall_table: Fixup compile warning
  riscv: ptrace: Remove duplicate operation
  riscv: traps: Add noinstr to prevent instrumentation inserted
  riscv: convert to generic entry
  riscv: Support HAVE_IRQ_EXIT_ON_IRQ_STACK
  riscv: Support HAVE_SOFTIRQ_ON_OWN_STACK
  riscv: Add config of thread stack size
  riscv: Typo fixup for addi -> andi in comment

Jisheng Zhang (1):
  riscv: remove extra level wrappers of trace_hardirqs_{on,off}

Lai Jiangshan (1):
  compiler_types.h: Add __noinstr_section() for noinstr

 arch/riscv/Kconfig                    |  21 +++
 arch/riscv/include/asm/csr.h          |   1 -
 arch/riscv/include/asm/entry-common.h |   8 +
 arch/riscv/include/asm/ptrace.h       |  10 +-
 arch/riscv/include/asm/stacktrace.h   |   5 +
 arch/riscv/include/asm/syscall.h      |   6 +
 arch/riscv/include/asm/thread_info.h  |  27 +--
 arch/riscv/include/asm/vmap_stack.h   |  28 +++
 arch/riscv/kernel/Makefile            |   3 +-
 arch/riscv/kernel/elf_kexec.c         |   2 +-
 arch/riscv/kernel/entry.S             | 239 ++++----------------------
 arch/riscv/kernel/irq.c               | 110 ++++++++++++
 arch/riscv/kernel/ptrace.c            |  44 -----
 arch/riscv/kernel/signal.c            |  21 +--
 arch/riscv/kernel/sys_riscv.c         |  27 +++
 arch/riscv/kernel/trace_irq.c         |  27 ---
 arch/riscv/kernel/trace_irq.h         |  11 --
 arch/riscv/kernel/traps.c             |  74 ++++++--
 arch/riscv/mm/fault.c                 |  16 +-
 drivers/firmware/efi/libstub/Makefile |   2 +-
 include/linux/compiler_types.h        |   8 +-
 21 files changed, 332 insertions(+), 358 deletions(-)
 create mode 100644 arch/riscv/include/asm/entry-common.h
 create mode 100644 arch/riscv/include/asm/vmap_stack.h
 delete mode 100644 arch/riscv/kernel/trace_irq.c
 delete mode 100644 arch/riscv/kernel/trace_irq.h