1 files changed, 18 insertions, 0 deletions

diff --git a/arch/x86/events/intel/bts.c b/arch/x86/events/intel/bts.c
index 141e07b06216..24ffa1e88cf9 100644
--- a/arch/x86/events/intel/bts.c
+++ b/arch/x86/events/intel/bts.c
@@ -582,6 +582,24 @@ static __init int bts_init(void)
         if (!boot_cpu_has(X86_FEATURE_DTES64) || !x86_pmu.bts)
                 return -ENODEV;
 
+        if (boot_cpu_has(X86_FEATURE_PTI)) {
+                /*
+                 * BTS hardware writes through a virtual memory map we must
+                 * either use the kernel physical map, or the user mapping of
+                 * the AUX buffer.
+                 *
+                 * However, since this driver supports per-CPU and per-task inherit
+                 * we cannot use the user mapping since it will not be availble
+                 * if we're not running the owning process.
+                 *
+                 * With PTI we can't use the kernal map either, because its not
+                 * there when we run userspace.
+                 *
+                 * For now, disable this driver when using PTI.
+                 */
+                return -ENODEV;
+        }
+
         bts_pmu.capabilities    = PERF_PMU_CAP_AUX_NO_SG | PERF_PMU_CAP_ITRACE |
                                   PERF_PMU_CAP_EXCLUSIVE;
         bts_pmu.task_ctx_nr     = perf_sw_context;