diff options
| author | Ingo Molnar <mingo@kernel.org> | 2020-07-25 13:16:16 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-07-25 13:16:16 +0300 |
| commit | fb4405ae6e1c66277b7d69d2c7a34215671da585 (patch) | |
| tree | 95a24efe3a3ca90a4b041d5ca548c2d37eac1ae8 /arch/x86/include/asm/io_bitmap.h | |
| parent | c9a1ff316bc9b1d1806a4366d0aef6e18833ba52 (diff) | |
| parent | ba47d845d715a010f7b51f6f89bae32845e6acb7 (diff) | |
| download | linux-fb4405ae6e1c66277b7d69d2c7a34215671da585.tar.xz | |
Merge tag 'v5.8-rc6' into x86/cpu, to refresh the branch before adding new commits
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/io_bitmap.h')
| -rw-r--r-- | arch/x86/include/asm/io_bitmap.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/x86/include/asm/io_bitmap.h b/arch/x86/include/asm/io_bitmap.h index ac1a99ffbd8d..7f080f5c7def 100644 --- a/arch/x86/include/asm/io_bitmap.h +++ b/arch/x86/include/asm/io_bitmap.h @@ -19,12 +19,28 @@ struct task_struct; void io_bitmap_share(struct task_struct *tsk); void io_bitmap_exit(struct task_struct *tsk); +static inline void native_tss_invalidate_io_bitmap(void) +{ + /* + * Invalidate the I/O bitmap by moving io_bitmap_base outside the + * TSS limit so any subsequent I/O access from user space will + * trigger a #GP. + * + * This is correct even when VMEXIT rewrites the TSS limit + * to 0x67 as the only requirement is that the base points + * outside the limit. + */ + this_cpu_write(cpu_tss_rw.x86_tss.io_bitmap_base, + IO_BITMAP_OFFSET_INVALID); +} + void native_tss_update_io_bitmap(void); #ifdef CONFIG_PARAVIRT_XXL #include <asm/paravirt.h> #else #define tss_update_io_bitmap native_tss_update_io_bitmap +#define tss_invalidate_io_bitmap native_tss_invalidate_io_bitmap #endif #else |