Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752150AbdLFPzs (ORCPT ); Wed, 6 Dec 2017 10:55:48 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:60512 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751598AbdLFPzp (ORCPT ); Wed, 6 Dec 2017 10:55:45 -0500 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 1C7BA60398 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=nleeder@codeaurora.org From: Neil Leeder To: Will Deacon , Mark Rutland Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Mark Langsdorf , Mark Salter , Jon Masters , Timur Tabi , Mark Brown , nleeder@codeaurora.org Subject: [PATCH] perf: qcom_l2_pmu: don't allow guest access Date: Wed, 6 Dec 2017 10:55:33 -0500 Message-Id: <1512575733-923-1-git-send-email-nleeder@codeaurora.org> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 946 Lines: 27 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.