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[PATCH] perf: qcom_l2_pmu: don't allow guest access

Guests cannot access IMPDEF system registers, which are used
by this driver. Disable the driver if it's running in a guest VM.

Signed-off-by: Neil Leeder <nleeder@xxxxxxxxxxxxxx>
 drivers/perf/qcom_l2_pmu.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/perf/qcom_l2_pmu.c b/drivers/perf/qcom_l2_pmu.c
index 4fdc848..49dc954 100644
--- a/drivers/perf/qcom_l2_pmu.c
+++ b/drivers/perf/qcom_l2_pmu.c
@@ -1057,6 +1057,10 @@ static int __init register_l2_cache_pmu_driver(void)
 	int err;
+	/* Don't enable driver if running as guest */
+	if (!is_hyp_mode_available())
+		return 0;
 	err = cpuhp_setup_state_multi(CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE,
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.