hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/release-management/issues/IB6JLE -------------------------------- Refactor the xcall proc code by move to proc_xcall.c and replace fast_syscall_enabled() with system_supports_xcall(). Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com> --- arch/arm64/include/asm/cpufeature.h | 6 ++ arch/arm64/kernel/cpufeature.c | 5 -- fs/proc/Makefile | 1 + fs/proc/base.c | 109 -------------------------- fs/proc/internal.h | 4 + fs/proc/proc_xcall.c | 114 ++++++++++++++++++++++++++++ 6 files changed, 125 insertions(+), 114 deletions(-) create mode 100644 fs/proc/proc_xcall.c diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 88cdf27fe701..00c3caddac98 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -889,6 +889,12 @@ static inline bool system_supports_haft(void) cpus_have_final_cap(ARM64_HAFT); } +static __always_inline bool system_supports_xcall(void) +{ + return IS_ENABLED(CONFIG_FAST_SYSCALL) && + cpus_have_const_cap(ARM64_HAS_XCALL); +} + int do_emulate_mrs(struct pt_regs *regs, u32 sys_reg, u32 rt); bool try_emulate_mrs(struct pt_regs *regs, u32 isn); diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index b13858668877..2a5001455ad6 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -2438,11 +2438,6 @@ static int __init xcall_setup(char *str) } __setup("xcall", xcall_setup); -bool fast_syscall_enabled(void) -{ - return is_xcall_support; -} - static bool has_xcall_support(const struct arm64_cpu_capabilities *entry, int __unused) { return is_xcall_support; diff --git a/fs/proc/Makefile b/fs/proc/Makefile index daa43e10b40b..b17f9b9eb652 100644 --- a/fs/proc/Makefile +++ b/fs/proc/Makefile @@ -38,3 +38,4 @@ proc-$(CONFIG_MEMORY_RELIABLE) += mem_reliable.o obj-$(CONFIG_ETMEM_SCAN) += etmem_scan.o obj-$(CONFIG_ETMEM_SWAP) += etmem_swap.o proc-${CONFIG_ETMEM} += etmem_proc.o +proc-$(CONFIG_FAST_SYSCALL) += proc_xcall.o diff --git a/fs/proc/base.c b/fs/proc/base.c index e62bb31bcbb1..62ec367d7f94 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -3454,115 +3454,6 @@ static const struct file_operations proc_pid_sg_level_operations = { }; #endif -#ifdef CONFIG_FAST_SYSCALL -bool fast_syscall_enabled(void); - -static int xcall_show(struct seq_file *m, void *v) -{ - struct inode *inode = m->private; - struct task_struct *p; - unsigned int rs, re; - - if (!fast_syscall_enabled()) - return -EACCES; - - p = get_proc_task(inode); - if (!p) - return -ESRCH; - - if (!p->xcall_enable) - goto out; - - seq_printf(m, "Enabled Total[%d/%d]:", bitmap_weight(p->xcall_enable, __NR_syscalls), - __NR_syscalls); - - for (rs = 0, bitmap_next_set_region(p->xcall_enable, &rs, &re, __NR_syscalls); - rs < re; rs = re + 1, - bitmap_next_set_region(p->xcall_enable, &rs, &re, __NR_syscalls)) { - rs == (re - 1) ? seq_printf(m, "%d,", rs) : - seq_printf(m, "%d-%d,", rs, re - 1); - } - seq_puts(m, "\n"); -out: - put_task_struct(p); - - return 0; -} - -static int xcall_open(struct inode *inode, struct file *filp) -{ - return single_open(filp, xcall_show, inode); -} - -static int xcall_enable_one(struct task_struct *p, unsigned int sc_no) -{ - bitmap_set(p->xcall_enable, sc_no, 1); - return 0; -} - -static int xcall_disable_one(struct task_struct *p, unsigned int sc_no) -{ - bitmap_clear(p->xcall_enable, sc_no, 1); - return 0; -} - -static ssize_t xcall_write(struct file *file, const char __user *buf, - size_t count, loff_t *offset) -{ - struct inode *inode = file_inode(file); - struct task_struct *p; - char buffer[TASK_COMM_LEN]; - const size_t maxlen = sizeof(buffer) - 1; - unsigned int sc_no = __NR_syscalls; - int ret = 0; - int is_clear = 0; - - if (!fast_syscall_enabled()) - return -EACCES; - - memset(buffer, 0, sizeof(buffer)); - if (!count || copy_from_user(buffer, buf, count > maxlen ? maxlen : count)) - return -EFAULT; - - p = get_proc_task(inode); - if (!p || !p->xcall_enable) - return -ESRCH; - - if (buffer[0] == '!') - is_clear = 1; - - if (kstrtouint(buffer + is_clear, 10, &sc_no)) { - ret = -EINVAL; - goto out; - } - - if (sc_no >= __NR_syscalls) { - ret = -EINVAL; - goto out; - } - - if (!is_clear && !test_bit(sc_no, p->xcall_enable)) - ret = xcall_enable_one(p, sc_no); - else if (is_clear && test_bit(sc_no, p->xcall_enable)) - ret = xcall_disable_one(p, sc_no); - else - ret = -EINVAL; - -out: - put_task_struct(p); - - return ret ? ret : count; -} - -static const struct file_operations proc_pid_xcall_operations = { - .open = xcall_open, - .read = seq_read, - .write = xcall_write, - .llseek = seq_lseek, - .release = single_release, -}; -#endif - /* * Thread groups */ diff --git a/fs/proc/internal.h b/fs/proc/internal.h index a86dba479fff..d5509cb5019c 100644 --- a/fs/proc/internal.h +++ b/fs/proc/internal.h @@ -334,3 +334,7 @@ static inline void pde_force_lookup(struct proc_dir_entry *pde) /* /proc/net/ entries can be changed under us by setns(CLONE_NEWNET) */ pde->proc_dops = &proc_net_dentry_ops; } + +#ifdef CONFIG_FAST_SYSCALL +extern const struct file_operations proc_pid_xcall_operations; +#endif diff --git a/fs/proc/proc_xcall.c b/fs/proc/proc_xcall.c new file mode 100644 index 000000000000..7d0cdd87a3c6 --- /dev/null +++ b/fs/proc/proc_xcall.c @@ -0,0 +1,114 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * xcall related proc code + * + * Copyright (C) 2025 Huawei Ltd. + */ +#include <linux/cpufeature.h> +#include <linux/sched.h> +#include <linux/seq_file.h> +#include "internal.h" + +static int xcall_show(struct seq_file *m, void *v) +{ + struct inode *inode = m->private; + struct task_struct *p; + unsigned int rs, re; + + if (!system_supports_xcall()) + return -EACCES; + + p = get_proc_task(inode); + if (!p) + return -ESRCH; + + if (!p->xcall_enable) + goto out; + + for (rs = 0, bitmap_next_set_region(p->xcall_enable, &rs, &re, __NR_syscalls); + rs < re; rs = re + 1, + bitmap_next_set_region(p->xcall_enable, &rs, &re, __NR_syscalls)) { + if (rs == (re - 1)) + seq_printf(m, "%d,", rs); + else + seq_printf(m, "%d-%d,", rs, re - 1); + } + seq_puts(m, "\n"); +out: + put_task_struct(p); + + return 0; +} + +static int xcall_open(struct inode *inode, struct file *filp) +{ + return single_open(filp, xcall_show, inode); +} + +static int xcall_enable_one(struct task_struct *p, unsigned int sc_no) +{ + test_and_set_bit(sc_no, p->xcall_enable); + return 0; +} + +static int xcall_disable_one(struct task_struct *p, unsigned int sc_no) +{ + test_and_clear_bit(sc_no, p->xcall_enable); + return 0; +} + +static ssize_t xcall_write(struct file *file, const char __user *buf, + size_t count, loff_t *offset) +{ + struct inode *inode = file_inode(file); + struct task_struct *p; + char buffer[5]; + const size_t maxlen = sizeof(buffer) - 1; + unsigned int sc_no = __NR_syscalls; + int ret = 0; + int is_clear = 0; + + if (!system_supports_xcall()) + return -EACCES; + + memset(buffer, 0, sizeof(buffer)); + if (!count || copy_from_user(buffer, buf, count > maxlen ? maxlen : count)) + return -EFAULT; + + p = get_proc_task(inode); + if (!p || !p->xcall_enable) + return -ESRCH; + + if (buffer[0] == '!') + is_clear = 1; + + if (kstrtouint(buffer + is_clear, 10, &sc_no)) { + ret = -EINVAL; + goto out; + } + + if (sc_no >= __NR_syscalls) { + ret = -EINVAL; + goto out; + } + + if (!is_clear && !test_bit(sc_no, p->xcall_enable)) + ret = xcall_enable_one(p, sc_no); + else if (is_clear && test_bit(sc_no, p->xcall_enable)) + ret = xcall_disable_one(p, sc_no); + else + ret = -EINVAL; + +out: + put_task_struct(p); + + return ret ? ret : count; +} + +const struct file_operations proc_pid_xcall_operations = { + .open = xcall_open, + .read = seq_read, + .write = xcall_write, + .llseek = seq_lseek, + .release = single_release, +}; -- 2.34.1