From mboxrd@z Thu Jan 1 00:00:00 1970 From: nleeder@codeaurora.org (Neil Leeder) Date: Wed, 6 Dec 2017 10:55:33 -0500 Subject: [PATCH] perf: qcom_l2_pmu: don't allow guest access Message-ID: <1512575733-923-1-git-send-email-nleeder@codeaurora.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- 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, "AP_PERF_ARM_QCOM_L2_ONLINE", l2cache_pmu_online_cpu, -- 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.