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| author | Thomas Gleixner <tglx@linutronix.de> | 2020-04-21 12:20:30 +0300 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2020-04-24 20:01:17 +0300 |
| commit | cb2a02355b042ec3ef11d0ba2a46742678e41632 (patch) | |
| tree | 618c7b32b616ef12f39858249b6f67581dd16029 /arch/x86/include/asm/mmu_context.h | |
| parent | d8f0b35331c4423e033f81f10eb5e0c7e4e1dcec (diff) | |
| download | linux-cb2a02355b042ec3ef11d0ba2a46742678e41632.tar.xz | |
x86/cr4: Sanitize CR4.PCE update
load_mm_cr4_irqsoff() is really a strange name for a function which has
only one purpose: Update the CR4.PCE bit depending on the perf state.
Rename it to update_cr4_pce_mm(), move it into the tlb code and provide a
function which can be invoked by the perf smp function calls.
Another step to remove exposure of cpu_tlbstate.
No functional change.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200421092559.049499158@linutronix.de
Diffstat (limited to 'arch/x86/include/asm/mmu_context.h')
| -rw-r--r-- | arch/x86/include/asm/mmu_context.h | 14 |
1 files changed, 1 insertions, 13 deletions
diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h index 9608536b9c85..2985d06660aa 100644 --- a/arch/x86/include/asm/mmu_context.h +++ b/arch/x86/include/asm/mmu_context.h @@ -24,21 +24,9 @@ static inline void paravirt_activate_mm(struct mm_struct *prev, #endif /* !CONFIG_PARAVIRT_XXL */ #ifdef CONFIG_PERF_EVENTS - DECLARE_STATIC_KEY_FALSE(rdpmc_never_available_key); DECLARE_STATIC_KEY_FALSE(rdpmc_always_available_key); - -static inline void load_mm_cr4_irqsoff(struct mm_struct *mm) -{ - if (static_branch_unlikely(&rdpmc_always_available_key) || - (!static_branch_unlikely(&rdpmc_never_available_key) && - atomic_read(&mm->context.perf_rdpmc_allowed))) - cr4_set_bits_irqsoff(X86_CR4_PCE); - else - cr4_clear_bits_irqsoff(X86_CR4_PCE); -} -#else -static inline void load_mm_cr4_irqsoff(struct mm_struct *mm) {} +void cr4_update_pce(void *ignored); #endif #ifdef CONFIG_MODIFY_LDT_SYSCALL |