1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_IOBITMAP_H 3 #define _ASM_X86_IOBITMAP_H 4 5 #include <linux/refcount.h> 6 #include <asm/processor.h> 7 8 struct io_bitmap { 9 u64 sequence; 10 refcount_t refcnt; 11 /* The maximum number of bytes to copy so all zero bits are covered */ 12 unsigned int max; 13 unsigned long bitmap[IO_BITMAP_LONGS]; 14 }; 15 16 struct task_struct; 17 18 #ifdef CONFIG_X86_IOPL_IOPERM 19 void io_bitmap_share(struct task_struct *tsk); 20 void io_bitmap_exit(struct task_struct *tsk); 21 native_tss_invalidate_io_bitmap(void)22static inline void native_tss_invalidate_io_bitmap(void) 23 { 24 /* 25 * Invalidate the I/O bitmap by moving io_bitmap_base outside the 26 * TSS limit so any subsequent I/O access from user space will 27 * trigger a #GP. 28 * 29 * This is correct even when VMEXIT rewrites the TSS limit 30 * to 0x67 as the only requirement is that the base points 31 * outside the limit. 32 */ 33 this_cpu_write(cpu_tss_rw.x86_tss.io_bitmap_base, 34 IO_BITMAP_OFFSET_INVALID); 35 } 36 37 void native_tss_update_io_bitmap(void); 38 39 #ifdef CONFIG_PARAVIRT_XXL 40 #include <asm/paravirt.h> 41 #else 42 #define tss_update_io_bitmap native_tss_update_io_bitmap 43 #define tss_invalidate_io_bitmap native_tss_invalidate_io_bitmap 44 #endif 45 46 #else io_bitmap_share(struct task_struct * tsk)47static inline void io_bitmap_share(struct task_struct *tsk) { } io_bitmap_exit(struct task_struct * tsk)48static inline void io_bitmap_exit(struct task_struct *tsk) { } tss_update_io_bitmap(void)49static inline void tss_update_io_bitmap(void) { } 50 #endif 51 52 #endif 53