[PATCH V6 00/11] riscv: Add GENERIC_ENTRY support and related features

From: guoren
Date: Sat Oct 01 2022 - 21:25:49 EST


From: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>

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_v6

v6:
- 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/20220918155246.1203293-1-guoren@xxxxxxxxxx/
- 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/20220908022506.1275799-1-guoren@xxxxxxxxxx/
- Fixup entry.S with "la" bug (by Conor.Dooley)
- Fixup missing noinstr bug (by Peter Zijlstra)

V3:
https://lore.kernel.org/linux-riscv/20220906035423.634617-1-guoren@xxxxxxxxxx/
- 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/20220904072637.8619-1-guoren@xxxxxxxxxx/
- Fixup compile error by include "riscv: ptrace: Remove duplicate
operation"
- Fixup compile warning
Reported-by: kernel test robot <lkp@xxxxxxxxx>
- Add test repo link in cover letter

V1:
https://lore.kernel.org/linux-riscv/20220903163808.1954131-1-guoren@xxxxxxxxxx/

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

Guo Ren (8):
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

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 | 230 +++-----------------------
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 | 70 ++++++--
arch/riscv/mm/fault.c | 14 +-
drivers/firmware/efi/libstub/Makefile | 2 +-
include/linux/compiler_types.h | 8 +-
21 files changed, 321 insertions(+), 354 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

--
2.36.1