From patchwork Mon Jul 12 06:08:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 476353 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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 21695C07E99 for ; Mon, 12 Jul 2021 06:20:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0C2C861130 for ; Mon, 12 Jul 2021 06:20:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232813AbhGLGX0 (ORCPT ); Mon, 12 Jul 2021 02:23:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:39904 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234549AbhGLGW2 (ORCPT ); Mon, 12 Jul 2021 02:22:28 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id CDA0161159; Mon, 12 Jul 2021 06:19:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626070757; bh=cxO9V95kqkRubE+r1N44NYOZAwJe2Fu08WNbnIwdhSo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gIMJ05A0JDkOjVldCHQckfHH22MJOYTFIhMEsUFlnuYzjpRS89xFP1NpCB+ibH9ry kAjMq/ontgqFUb5vefdhvamqeZ7vYlcU6JsmJ3uSMJbwuf9IUwroSc1ZwbZV0JChdL DfmxEJTz9funzeL+/Zl+fiv+dvhqh5YbeqSlj/IE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Borislav Petkov , Tony Luck , Sasha Levin Subject: [PATCH 5.4 128/348] EDAC/Intel: Do not load EDAC driver when running as a guest Date: Mon, 12 Jul 2021 08:08:32 +0200 Message-Id: <20210712060718.331362970@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210712060659.886176320@linuxfoundation.org> References: <20210712060659.886176320@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Luck, Tony [ Upstream commit f0a029fff4a50eb01648810a77ba1873e829fdd4 ] There's little to no point in loading an EDAC driver running in a guest: 1) The CPU model reported by CPUID may not represent actual h/w 2) The hypervisor likely does not pass in access to memory controller devices 3) Hypervisors generally do not pass corrected error details to guests Add a check in each of the Intel EDAC drivers for X86_FEATURE_HYPERVISOR and simply return -ENODEV in the init routine. Acked-by: Borislav Petkov Signed-off-by: Tony Luck Link: https://lore.kernel.org/r/20210615174419.GA1087688@agluck-desk2.amr.corp.intel.com Signed-off-by: Sasha Levin --- drivers/edac/i10nm_base.c | 3 +++ drivers/edac/pnd2_edac.c | 3 +++ drivers/edac/sb_edac.c | 3 +++ drivers/edac/skx_base.c | 3 +++ 4 files changed, 12 insertions(+) diff --git a/drivers/edac/i10nm_base.c b/drivers/edac/i10nm_base.c index dfcde7ed9500..f72be5f94e6f 100644 --- a/drivers/edac/i10nm_base.c +++ b/drivers/edac/i10nm_base.c @@ -249,6 +249,9 @@ static int __init i10nm_init(void) if (owner && strncmp(owner, EDAC_MOD_STR, sizeof(EDAC_MOD_STR))) return -EBUSY; + if (cpu_feature_enabled(X86_FEATURE_HYPERVISOR)) + return -ENODEV; + id = x86_match_cpu(i10nm_cpuids); if (!id) return -ENODEV; diff --git a/drivers/edac/pnd2_edac.c b/drivers/edac/pnd2_edac.c index dac45e2071b3..e054eb038903 100644 --- a/drivers/edac/pnd2_edac.c +++ b/drivers/edac/pnd2_edac.c @@ -1555,6 +1555,9 @@ static int __init pnd2_init(void) if (owner && strncmp(owner, EDAC_MOD_STR, sizeof(EDAC_MOD_STR))) return -EBUSY; + if (cpu_feature_enabled(X86_FEATURE_HYPERVISOR)) + return -ENODEV; + id = x86_match_cpu(pnd2_cpuids); if (!id) return -ENODEV; diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c index b557a53c75c4..d39f5bfb8bd9 100644 --- a/drivers/edac/sb_edac.c +++ b/drivers/edac/sb_edac.c @@ -3512,6 +3512,9 @@ static int __init sbridge_init(void) if (owner && strncmp(owner, EDAC_MOD_STR, sizeof(EDAC_MOD_STR))) return -EBUSY; + if (cpu_feature_enabled(X86_FEATURE_HYPERVISOR)) + return -ENODEV; + id = x86_match_cpu(sbridge_cpuids); if (!id) return -ENODEV; diff --git a/drivers/edac/skx_base.c b/drivers/edac/skx_base.c index 77cd370bd62f..b1d717cb8df9 100644 --- a/drivers/edac/skx_base.c +++ b/drivers/edac/skx_base.c @@ -605,6 +605,9 @@ static int __init skx_init(void) if (owner && strncmp(owner, EDAC_MOD_STR, sizeof(EDAC_MOD_STR))) return -EBUSY; + if (cpu_feature_enabled(X86_FEATURE_HYPERVISOR)) + return -ENODEV; + id = x86_match_cpu(skx_cpuids); if (!id) return -ENODEV;