diff options
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/cpu/common.c | 26 | ||||
| -rw-r--r-- | arch/x86/kernel/ioport.c | 26 | ||||
| -rw-r--r-- | arch/x86/kernel/process.c | 4 |
3 files changed, 40 insertions, 16 deletions
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 7bf402be13bb..6f6ca6bd58d6 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -1804,6 +1804,22 @@ static inline void gdt_setup_doublefault_tss(int cpu) } #endif /* !CONFIG_X86_64 */ +static inline void tss_setup_io_bitmap(struct tss_struct *tss) +{ + tss->x86_tss.io_bitmap_base = IO_BITMAP_OFFSET_INVALID; + +#ifdef CONFIG_X86_IOPL_IOPERM + tss->io_bitmap.prev_max = 0; + tss->io_bitmap.prev_sequence = 0; + memset(tss->io_bitmap.bitmap, 0xff, sizeof(tss->io_bitmap.bitmap)); + /* + * Invalidate the extra array entry past the end of the all + * permission bitmap as required by the hardware. + */ + tss->io_bitmap.mapall[IO_BITMAP_LONGS] = ~0UL; +#endif +} + /* * cpu_init() initializes state that is per-CPU. Some data is already * initialized (naturally) in the bootstrap process, such as the GDT @@ -1860,15 +1876,7 @@ void cpu_init(void) /* Initialize the TSS. */ tss_setup_ist(tss); - tss->x86_tss.io_bitmap_base = IO_BITMAP_OFFSET_INVALID; - tss->io_bitmap.prev_max = 0; - tss->io_bitmap.prev_sequence = 0; - memset(tss->io_bitmap.bitmap, 0xff, sizeof(tss->io_bitmap.bitmap)); - /* - * Invalidate the extra array entry past the end of the all - * permission bitmap as required by the hardware. - */ - tss->io_bitmap.mapall[IO_BITMAP_LONGS] = ~0UL; + tss_setup_io_bitmap(tss); set_tss_desc(cpu, &get_cpu_entry_area(cpu)->tss.x86_tss); load_TR_desc(); diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c index d5dcde972c42..8abeee0dd7bf 100644 --- a/arch/x86/kernel/ioport.c +++ b/arch/x86/kernel/ioport.c @@ -14,6 +14,8 @@ #include <asm/io_bitmap.h> #include <asm/desc.h> +#ifdef CONFIG_X86_IOPL_IOPERM + static atomic64_t io_bitmap_sequence; void io_bitmap_share(struct task_struct *tsk) @@ -172,13 +174,6 @@ SYSCALL_DEFINE1(iopl, unsigned int, level) struct thread_struct *t = ¤t->thread; unsigned int old; - /* - * Careful: the IOPL bits in regs->flags are undefined under Xen PV - * and changing them has no effect. - */ - if (IS_ENABLED(CONFIG_X86_IOPL_NONE)) - return -ENOSYS; - if (level > 3) return -EINVAL; @@ -200,3 +195,20 @@ SYSCALL_DEFINE1(iopl, unsigned int, level) return 0; } + +#else /* CONFIG_X86_IOPL_IOPERM */ + +long ksys_ioperm(unsigned long from, unsigned long num, int turn_on) +{ + return -ENOSYS; +} +SYSCALL_DEFINE3(ioperm, unsigned long, from, unsigned long, num, int, turn_on) +{ + return -ENOSYS; +} + +SYSCALL_DEFINE1(iopl, unsigned int, level) +{ + return -ENOSYS; +} +#endif diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 8a844a5d5ae8..7964d7db9366 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -322,6 +322,7 @@ void arch_setup_new_exec(void) } } +#ifdef CONFIG_X86_IOPL_IOPERM static inline void tss_invalidate_io_bitmap(struct tss_struct *tss) { /* @@ -409,6 +410,9 @@ void tss_update_io_bitmap(void) tss_invalidate_io_bitmap(tss); } } +#else /* CONFIG_X86_IOPL_IOPERM */ +static inline void switch_to_bitmap(unsigned long tifp) { } +#endif #ifdef CONFIG_SMP |