diff options
Diffstat (limited to 'arch/powerpc/perf')
| -rw-r--r-- | arch/powerpc/perf/core-book3s.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c index f89bbd54ecec..39846226c702 100644 --- a/arch/powerpc/perf/core-book3s.c +++ b/arch/powerpc/perf/core-book3s.c @@ -1226,6 +1226,7 @@ static void power_pmu_disable(struct pmu *pmu) */ write_mmcr0(cpuhw, val); mb(); + isync(); /* * Disable instruction sampling if it was enabled @@ -1234,12 +1235,26 @@ static void power_pmu_disable(struct pmu *pmu) mtspr(SPRN_MMCRA, cpuhw->mmcr[2] & ~MMCRA_SAMPLE_ENABLE); mb(); + isync(); } cpuhw->disabled = 1; cpuhw->n_added = 0; ebb_switch_out(mmcr0); + +#ifdef CONFIG_PPC64 + /* + * These are readable by userspace, may contain kernel + * addresses and are not switched by context switch, so clear + * them now to avoid leaking anything to userspace in general + * including to another process. + */ + if (ppmu->flags & PPMU_ARCH_207S) { + mtspr(SPRN_SDAR, 0); + mtspr(SPRN_SIAR, 0); + } +#endif } local_irq_restore(flags); |