lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:   Wed,  6 Dec 2017 10:55:33 -0500
From:   Neil Leeder <>
To:     Will Deacon <>,
        Mark Rutland <>
        Mark Langsdorf <>,
        Mark Salter <>, Jon Masters <>,
        Timur Tabi <>,
        Mark Brown <>,
Subject: [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 <>
 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.

Powered by blists - more mailing lists