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| author | Ingo Molnar <mingo@kernel.org> | 2020-07-25 21:49:36 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-07-25 21:49:36 +0200 |
| commit | c84d53051fcb4f3d14d5a245e1d7ee8512bcb199 (patch) | |
| tree | 30f7f845afc8e0428c1fbb1bc93f52b120d40661 /arch/x86/include/asm/io_bitmap.h | |
| parent | 9a71df495c3d29dab596bb590e73fd8b20106e2d (diff) | |
| parent | ba47d845d715a010f7b51f6f89bae32845e6acb7 (diff) | |
| download | kernel_replicant_linux-c84d53051fcb4f3d14d5a245e1d7ee8512bcb199.tar.gz kernel_replicant_linux-c84d53051fcb4f3d14d5a245e1d7ee8512bcb199.tar.bz2 kernel_replicant_linux-c84d53051fcb4f3d14d5a245e1d7ee8512bcb199.zip | |
Merge tag 'v5.8-rc6' into locking/core, to pick up fixes
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 |