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| author | Thomas Gleixner <tglx@linutronix.de> | 2020-04-21 11:20:30 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2020-04-24 19:01:17 +0200 |
| commit | cb2a02355b042ec3ef11d0ba2a46742678e41632 (patch) | |
| tree | 618c7b32b616ef12f39858249b6f67581dd16029 /arch/x86/events/core.c | |
| parent | d8f0b35331c4423e033f81f10eb5e0c7e4e1dcec (diff) | |
| download | linux-cb2a02355b042ec3ef11d0ba2a46742678e41632.tar.gz linux-cb2a02355b042ec3ef11d0ba2a46742678e41632.tar.bz2 linux-cb2a02355b042ec3ef11d0ba2a46742678e41632.zip | |
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/events/core.c')
| -rw-r--r-- | arch/x86/events/core.c | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c index a619763e96e1..30d2b1d3e94c 100644 --- a/arch/x86/events/core.c +++ b/arch/x86/events/core.c @@ -2162,11 +2162,6 @@ static int x86_pmu_event_init(struct perf_event *event) return err; } -static void refresh_pce(void *ignored) -{ - load_mm_cr4_irqsoff(this_cpu_read(cpu_tlbstate.loaded_mm)); -} - static void x86_pmu_event_mapped(struct perf_event *event, struct mm_struct *mm) { if (!(event->hw.flags & PERF_X86_EVENT_RDPMC_ALLOWED)) @@ -2185,7 +2180,7 @@ static void x86_pmu_event_mapped(struct perf_event *event, struct mm_struct *mm) lockdep_assert_held_write(&mm->mmap_sem); if (atomic_inc_return(&mm->context.perf_rdpmc_allowed) == 1) - on_each_cpu_mask(mm_cpumask(mm), refresh_pce, NULL, 1); + on_each_cpu_mask(mm_cpumask(mm), cr4_update_pce, NULL, 1); } static void x86_pmu_event_unmapped(struct perf_event *event, struct mm_struct *mm) @@ -2195,7 +2190,7 @@ static void x86_pmu_event_unmapped(struct perf_event *event, struct mm_struct *m return; if (atomic_dec_and_test(&mm->context.perf_rdpmc_allowed)) - on_each_cpu_mask(mm_cpumask(mm), refresh_pce, NULL, 1); + on_each_cpu_mask(mm_cpumask(mm), cr4_update_pce, NULL, 1); } static int x86_pmu_event_idx(struct perf_event *event) @@ -2253,7 +2248,7 @@ static ssize_t set_attr_rdpmc(struct device *cdev, else if (x86_pmu.attr_rdpmc == 2) static_branch_dec(&rdpmc_always_available_key); - on_each_cpu(refresh_pce, NULL, 1); + on_each_cpu(cr4_update_pce, NULL, 1); x86_pmu.attr_rdpmc = val; } |