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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 79552C433EF for ; Tue, 14 Jun 2022 18:41:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1354137AbiFNSl2 (ORCPT ); Tue, 14 Jun 2022 14:41:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58108 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1356086AbiFNSlR (ORCPT ); Tue, 14 Jun 2022 14:41:17 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 091AA49CAF; Tue, 14 Jun 2022 11:41:15 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id B06D0B81AF2; Tue, 14 Jun 2022 18:41:13 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0FFC6C3411B; Tue, 14 Jun 2022 18:41:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1655232072; bh=AD6M8R0F9Ak/do8OFvGwfHxyqKd6t20kvQOZOhgHRDY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VazhfC3JdblE++yuGDSB8fEc31ULBAo7fZzRjh2zx2/cjZOXOruZyMRyoJ5qpo36+ NT5bB+dBjgGjnq7UmGfnhJ2MlUwEYZBff/hS3ByGuDyB7LNWz/4rb4Omid+VUyFm71 0IObRPQ45p0P5KWGeEHD5VjzHAL2McIT+2gFbrK0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pawan Gupta , Borislav Petkov , Thomas Gleixner , Thadeu Lima de Souza Cascardo Subject: [PATCH 4.9 14/20] x86/bugs: Group MDS, TAA & Processor MMIO Stale Data mitigations Date: Tue, 14 Jun 2022 20:39:57 +0200 Message-Id: <20220614183725.465157330@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220614183722.061550591@linuxfoundation.org> References: <20220614183722.061550591@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: Pawan Gupta commit e5925fb867290ee924fcf2fe3ca887b792714366 upstream MDS, TAA and Processor MMIO Stale Data mitigations rely on clearing CPU buffers. Moreover, status of these mitigations affects each other. During boot, it is important to maintain the order in which these mitigations are selected. This is especially true for md_clear_update_mitigation() that needs to be called after MDS, TAA and Processor MMIO Stale Data mitigation selection is done. Introduce md_clear_select_mitigation(), and select all these mitigations from there. This reflects relationships between these mitigations and ensures proper ordering. Signed-off-by: Pawan Gupta Signed-off-by: Borislav Petkov Signed-off-by: Thomas Gleixner Signed-off-by: Thadeu Lima de Souza Cascardo Signed-off-by: Greg Kroah-Hartman --- arch/x86/kernel/cpu/bugs.c | 26 ++++++++++++++++---------- 1 file changed, 16 insertions(+), 10 deletions(-) --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -40,6 +40,7 @@ static void __init ssb_select_mitigation static void __init l1tf_select_mitigation(void); static void __init mds_select_mitigation(void); static void __init md_clear_update_mitigation(void); +static void __init md_clear_select_mitigation(void); static void __init taa_select_mitigation(void); static void __init mmio_select_mitigation(void); static void __init srbds_select_mitigation(void); @@ -112,18 +113,9 @@ void __init check_bugs(void) spectre_v2_select_mitigation(); ssb_select_mitigation(); l1tf_select_mitigation(); - mds_select_mitigation(); - taa_select_mitigation(); - mmio_select_mitigation(); + md_clear_select_mitigation(); srbds_select_mitigation(); - /* - * As MDS, TAA and MMIO Stale Data mitigations are inter-related, update - * and print their mitigation after MDS, TAA and MMIO Stale Data - * mitigation selection is done. - */ - md_clear_update_mitigation(); - arch_smt_update(); #ifdef CONFIG_X86_32 @@ -502,6 +494,20 @@ out: pr_info("MMIO Stale Data: %s\n", mmio_strings[mmio_mitigation]); } +static void __init md_clear_select_mitigation(void) +{ + mds_select_mitigation(); + taa_select_mitigation(); + mmio_select_mitigation(); + + /* + * As MDS, TAA and MMIO Stale Data mitigations are inter-related, update + * and print their mitigation after MDS, TAA and MMIO Stale Data + * mitigation selection is done. + */ + md_clear_update_mitigation(); +} + #undef pr_fmt #define pr_fmt(fmt) "SRBDS: " fmt