[PATCH -next v6 00/10] arm64: entry: Convert to generic entry

[Jinjie Ruan]

On 2025/9/16 16:26, Jinjie Ruan wrote:
> Currently, x86, Riscv, Loongarch use the generic entry which makes
> maintainers' work easier and codes more elegant. In the previous patchset,
> arm64 has already successfully switched to the generic IRQ entry, it is
> time to completely convert arm64 to generic entry.

Gentle ping.


> 
> The main convert steps are as follows:
> - Make arm64 closer to generic syscall entry code.
> - Switch to generic entry.
> 
> This patch set is rebased on v6.17-rc5-next.
> 
> It was tested ok with following test cases on QEMU virt platform:
>  - Perf tests.
>  - Different `dynamic preempt` mode switch.
>  - Pseudo NMI tests.
>  - Stress-ng CPU stress test.
>  - MTE test case in Documentation/arch/arm64/memory-tagging-extension.rst
>    and all test cases in tools/testing/selftests/arm64/mte/*.
> 
> The test QEMU configuration is as follows:
> 
> 	qemu-system-aarch64 \
> 		-M virt,gic-version=3,virtualization=on,mte=on \
> 		-cpu max,pauth-impdef=on \
> 		-kernel Image \
> 		-smp 8,sockets=1,cores=4,threads=2 \
> 		-m 512m \
> 		-nographic \
> 		-no-reboot \
> 		-device virtio-rng-pci \
> 		-append "root=/dev/vda rw console=ttyAMA0 kgdboc=ttyAMA0,115200 \
> 			earlycon preempt=voluntary irqchip.gicv3_pseudo_nmi=1" \
> 		-drive if=none,file=images/rootfs.ext4,format=raw,id=hd0 \
> 		-device virtio-blk-device,drive=hd0 \
> 
> Changes in v6:
> - Rebased on v6.17-rc5-next as arm64 generic irq entry has merged.
> - Update the commit message.
> - Link to v5: https://lore.kernel.org/all/20241206101744.4161990-1-ruanjinjie@huawei.com/
> 
> Changes in v5:
> - Not change arm32 and keep inerrupts_enabled() macro for gicv3 driver.
> - Move irqentry_state definition into arch/arm64/kernel/entry-common.c.
> - Avoid removing the __enter_from_*() and __exit_to_*() wrappers.
> - Update "irqentry_state_t ret/irq_state" to "state"
>   to keep it consistently.
> - Use generic irq entry header for PREEMPT_DYNAMIC after split
>   the generic entry.
> - Also refactor the ARM64 syscall code.
> - Introduce arch_ptrace_report_syscall_entry/exit(), instead of
>   arch_pre/post_report_syscall_entry/exit() to simplify code.
> - Make the syscall patches clear separation.
> - Update the commit message.
> - Link to v4: https://lore.kernel.org/all/20241025100700.3714552-1-ruanjinjie@huawei.com/
> 
> Changes in v4:
> - Rework/cleanup split into a few patches as Mark suggested.
> - Replace interrupts_enabled() macro with regs_irqs_disabled(), instead
>   of left it here.
> - Remove rcu and lockdep state in pt_regs by using temporary
>   irqentry_state_t as Mark suggested.
> - Remove some unnecessary intermediate functions to make it clear.
> - Rework preempt irq and PREEMPT_DYNAMIC code
>   to make the switch more clear.
> - arch_prepare_*_entry/exit() -> arch_pre_*_entry/exit().
> - Expand the arch functions comment.
> - Make arch functions closer to its caller.
> - Declare saved_reg in for block.
> - Remove arch_exit_to_kernel_mode_prepare(), arch_enter_from_kernel_mode().
> - Adjust "Add few arch functions to use generic entry" patch to be
>   the penultimate.
> - Update the commit message.
> - Add suggested-by.
> - Link to v3: https://lore.kernel.org/all/20240629085601.470241-1-ruanjinjie@huawei.com/
> 
> Changes in v3:
> - Test the MTE test cases.
> - Handle forget_syscall() in arch_post_report_syscall_entry()
> - Make the arch funcs not use __weak as Thomas suggested, so move
>   the arch funcs to entry-common.h, and make arch_forget_syscall() folded
>   in arch_post_report_syscall_entry() as suggested.
> - Move report_single_step() to thread_info.h for arm64
> - Change __always_inline() to inline, add inline for the other arch funcs.
> - Remove unused signal.h for entry-common.h.
> - Add Suggested-by.
> - Update the commit message.
> 
> Changes in v2:
> - Add tested-by.
> - Fix a bug that not call arch_post_report_syscall_entry() in
>   syscall_trace_enter() if ptrace_report_syscall_entry() return not zero.
> - Refactor report_syscall().
> - Add comment for arch_prepare_report_syscall_exit().
> - Adjust entry-common.h header file inclusion to alphabetical order.
> - Update the commit message.
> 
> Jinjie Ruan (10):
>   arm64/ptrace: Split report_syscall() into report_syscall_enter/exit()
>   arm64/ptrace: Refactor syscall_trace_enter/exit()
>   arm64/ptrace: Refator el0_svc_common()
>   entry: Extract syscall_exit_to_user_mode_prepare() helper
>   arm64/ptrace: Handle ptrace_report_syscall_entry() error
>   arm64/ptrace: Rework secure_computing() in syscall_trace_enter()
>   arm64/ptrace: Use syscall_get_arguments() heleper
>   entry: Add arch_ptrace_report_syscall_entry/exit()
>   entry: Add has_syscall_work() helper
>   arm64: entry: Convert to generic entry
> 
>  arch/arm64/Kconfig                    |  2 +-
>  arch/arm64/include/asm/entry-common.h | 69 ++++++++++++++++++++
>  arch/arm64/include/asm/syscall.h      |  6 +-
>  arch/arm64/include/asm/thread_info.h  | 22 +------
>  arch/arm64/kernel/debug-monitors.c    |  7 +++
>  arch/arm64/kernel/ptrace.c            | 90 ---------------------------
>  arch/arm64/kernel/signal.c            |  2 +-
>  arch/arm64/kernel/syscall.c           | 31 +++------
>  include/linux/entry-common.h          | 42 ++++++++-----
>  kernel/entry/syscall-common.c         | 43 ++++++++++++-
>  10 files changed, 161 insertions(+), 153 deletions(-)
>