diff options
| author |   Thomas Gleixner <tglx@linutronix.de> | 2021-06-23 14:02:23 +0200 |
|---|---|---|
| committer |   Borislav Petkov <bp@suse.de> | 2021-06-23 19:55:51 +0200 |
| commit | 72a6c08c44e4460e39315ca828f60b8d5afd6b19 (patch) | |
| tree | 385a8cb9ee0dc549709a9afd559e3095cd645db1 /arch/x86/include/asm/special_insns.h | |
| parent | x86/fpu: Don't store PKRU in xstate in fpu_reset_fpstate() (diff) | |
| download | linux-dev-72a6c08c44e4460e39315ca828f60b8d5afd6b19.tar.xz linux-dev-72a6c08c44e4460e39315ca828f60b8d5afd6b19.zip | |
x86/pkru: Remove xstate fiddling from write_pkru()
The PKRU value of a task is stored in task->thread.pkru when the task is
scheduled out. PKRU is restored on schedule in from there. So keeping the
XSAVE buffer up to date is a pointless exercise.
Remove the xstate fiddling and cleanup all related functions.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210623121456.897372712@linutronix.de
Diffstat (limited to 'arch/x86/include/asm/special_insns.h')
| -rw-r--r-- | arch/x86/include/asm/special_insns.h | 14 |
1 files changed, 1 insertions, 13 deletions
diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h index 2acd6cb62328..f3fbb84ff8a7 100644 --- a/arch/x86/include/asm/special_insns.h +++ b/arch/x86/include/asm/special_insns.h @@ -104,25 +104,13 @@ static inline void wrpkru(u32 pkru) : : "a" (pkru), "c"(ecx), "d"(edx)); } -static inline void __write_pkru(u32 pkru) -{ - /* - * WRPKRU is relatively expensive compared to RDPKRU. - * Avoid WRPKRU when it would not change the value. - */ - if (pkru == rdpkru()) - return; - - wrpkru(pkru); -} - #else static inline u32 rdpkru(void) { return 0; } -static inline void __write_pkru(u32 pkru) +static inline void wrpkru(u32 pkru) { } #endif |