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. 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. 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@xxxxxxxxxx/ - 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@xxxxxxxxxx/ - 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 (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
