From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0D70DC4363A for ; Tue, 27 Oct 2020 17:12:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B20E620657 for ; Tue, 27 Oct 2020 17:12:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603818746; bh=/yjX6vWPcSo7hUEymnALcsehntK9X15tfQ6E/cEgXA4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=efemf7yQ8saV40SMkvIfo++9d9KjIPrJQjhkLdZ3sCyYCcPYkFbY7UegX5xJmm38v ZxAB1ovcglq2n5egcPpc5sHA/xs2toTjrPDaYIz97wJDeh8gwvXb9NnxSjhxC4YlWB md9M+El/9pPvazmjT6De5eW1BeaBWGR51VFrqRP4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1785725AbgJ0O7p (ORCPT ); Tue, 27 Oct 2020 10:59:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:51206 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1773243AbgJ0Ovv (ORCPT ); Tue, 27 Oct 2020 10:51:51 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 58FBD20773; Tue, 27 Oct 2020 14:51:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603810310; bh=/yjX6vWPcSo7hUEymnALcsehntK9X15tfQ6E/cEgXA4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rbernrvZHu0RBjuEVfsT6+fgzliH1zY6sRfIf3IJ4tYA26srRGXuVxJNrHlDXnS0z quS5PYW3eEPrdp4IpjY2V44/bK11eCAdIZfK27zrLL3eXsvZLyShPdJs5xyI41cYXT QKR55G8ztSeqhILec6Osxxql9uQc9FcU42fMetHA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Kan Liang , "Peter Zijlstra (Intel)" , Sasha Levin Subject: [PATCH 5.8 094/633] perf/x86/intel/uncore: Reduce the number of CBOX counters Date: Tue, 27 Oct 2020 14:47:17 +0100 Message-Id: <20201027135527.110071499@linuxfoundation.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201027135522.655719020@linuxfoundation.org> References: <20201027135522.655719020@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Kan Liang [ Upstream commit ee139385432e919f4d1f59b80edbc073cdae1391 ] An oops is triggered by the fuzzy test. [ 327.853081] unchecked MSR access error: RDMSR from 0x70c at rIP: 0xffffffffc082c820 (uncore_msr_read_counter+0x10/0x50 [intel_uncore]) [ 327.853083] Call Trace: [ 327.853085] [ 327.853089] uncore_pmu_event_start+0x85/0x170 [intel_uncore] [ 327.853093] uncore_pmu_event_add+0x1a4/0x410 [intel_uncore] [ 327.853097] ? event_sched_in.isra.118+0xca/0x240 There are 2 GP counters for each CBOX, but the current code claims 4 counters. Accessing the invalid registers triggers the oops. Fixes: 6e394376ee89 ("perf/x86/intel/uncore: Add Intel Icelake uncore support") Signed-off-by: Kan Liang Signed-off-by: Peter Zijlstra (Intel) Link: https://lkml.kernel.org/r/20200925134905.8839-3-kan.liang@linux.intel.com Signed-off-by: Sasha Levin --- arch/x86/events/intel/uncore_snb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/events/intel/uncore_snb.c b/arch/x86/events/intel/uncore_snb.c index 300937cc8795b..3b70c2ff177c0 100644 --- a/arch/x86/events/intel/uncore_snb.c +++ b/arch/x86/events/intel/uncore_snb.c @@ -314,7 +314,7 @@ static struct intel_uncore_ops icl_uncore_msr_ops = { static struct intel_uncore_type icl_uncore_cbox = { .name = "cbox", - .num_counters = 4, + .num_counters = 2, .perf_ctr_bits = 44, .perf_ctr = ICL_UNC_CBO_0_PER_CTR0, .event_ctl = SNB_UNC_CBO_0_PERFEVTSEL0, -- 2.25.1