Re: [PATCH -next V8 00/14] riscv: Add GENERIC_ENTRY support and related features

[Jisheng Zhang <jszhang@kernel.org>]

On Thu, Nov 03, 2022 at 03:50:33AM -0400, guoren@kernel.org wrote:
> From: Guo Ren <guoren@linux.alibaba.com>
> 
> 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. Some optimization for entry.S with new .macro and
> merge ret_from_kernel_thread into ret_from_fork.
> 
> We have tested it with rv64, rv32, rv64 + 32rootfs, all are passed.
> 
> You can directly try it with:
> [1] https://github.com/guoren83/linux/tree/generic_entry_v8
> 
> Any reviews and tests are helpful.

Thanks for this series,

Tested-by: Jisheng Zhang <jszhang@kernel.org>

> 
> v8:
>  - Rebase on palmer/for-next branch (20221102)
>  - Add save/restore_from_x5_to_x31 .macro (JishengZhang)
>  - Consolidate ret_from_kernel_thread into ret_from_fork (JishengZhang)
>  - Optimize __noinstr_section comment (JiangshanLai)
> 
> v7:
> https://lore.kernel.org/linux-riscv/20221015114702.3489989-1-guoren@kernel.org/
>  - 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/20221002012451.2351127-1-guoren@kernel.org/
>  - 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@kernel.org/
>  - 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@kernel.org/
>  - 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@kernel.org/
>  - 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@kernel.org/
>  - Fixup compile error by include "riscv: ptrace: Remove duplicate
>    operation"
>  - Fixup compile warning
>    Reported-by: kernel test robot <lkp@intel.com>
>  - Add test repo link in cover letter
> 
> V1:
> https://lore.kernel.org/linux-riscv/20220903163808.1954131-1-guoren@kernel.org/
> 
> 
> 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 (3):
>   riscv: remove extra level wrappers of trace_hardirqs_{on,off}
>   riscv: consolidate ret_from_kernel_thread into ret_from_fork
>   riscv: entry: consolidate general regs saving/restoring
> 
> Lai Jiangshan (1):
>   compiler_types.h: Add __noinstr_section() for noinstr
> 
>  arch/riscv/Kconfig                    |  21 ++
>  arch/riscv/include/asm/asm.h          |  63 +++++
>  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             | 327 +++-----------------------
>  arch/riscv/kernel/irq.c               | 110 +++++++++
>  arch/riscv/kernel/mcount-dyn.S        |  56 +----
>  arch/riscv/kernel/process.c           |   5 +-
>  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        |  15 +-
>  24 files changed, 407 insertions(+), 502 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
> 

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