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 0ADF1C43334 for ; Tue, 14 Jun 2022 18:42:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1357157AbiFNSmP (ORCPT ); Tue, 14 Jun 2022 14:42:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59282 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1357039AbiFNSls (ORCPT ); Tue, 14 Jun 2022 14:41:48 -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 2F1F24A90D; Tue, 14 Jun 2022 11:41:32 -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 BC6B9B8186A; Tue, 14 Jun 2022 18:41:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DE315C3411B; Tue, 14 Jun 2022 18:41:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1655232089; bh=xwd8s0NcWWmmlf0T2SyWUX1VuDno50o8PJA1UhCikjg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AzM1SqU4RQvNFLL2ebRzg6mdy2eEcLIDP+3RDcfUVkSxn84U7/ILcruNqtvLX7dtp EGvJdkMKjQrrE7NhSRs7WBcaDJKbsEFrVgeJQuYB18fc6F3ZaW2Cnrtj6rhKf9H0Ke bxVuL68vTyRbbMwwR2epRyCDJqKXB3vHD5Vj2+l8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Josh Poimboeuf , Thomas Gleixner , Thadeu Lima de Souza Cascardo Subject: [PATCH 4.9 20/20] x86/speculation/mmio: Print SMT warning Date: Tue, 14 Jun 2022 20:40:03 +0200 Message-Id: <20220614183726.901907101@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: Josh Poimboeuf commit 1dc6ff02c8bf77d71b9b5d11cbc9df77cfb28626 upstream Similar to MDS and TAA, print a warning if SMT is enabled for the MMIO Stale Data vulnerability. Signed-off-by: Josh Poimboeuf 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 | 11 +++++++++++ 1 file changed, 11 insertions(+) --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -1214,6 +1214,7 @@ static void update_mds_branch_idle(void) #define MDS_MSG_SMT "MDS CPU bug present and SMT on, data leak possible. See https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html for more details.\n" #define TAA_MSG_SMT "TAA CPU bug present and SMT on, data leak possible. See https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/tsx_async_abort.html for more details.\n" +#define MMIO_MSG_SMT "MMIO Stale Data CPU bug present and SMT on, data leak possible. See https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/processor_mmio_stale_data.html for more details.\n" void arch_smt_update(void) { @@ -1258,6 +1259,16 @@ void arch_smt_update(void) break; } + switch (mmio_mitigation) { + case MMIO_MITIGATION_VERW: + case MMIO_MITIGATION_UCODE_NEEDED: + if (sched_smt_active()) + pr_warn_once(MMIO_MSG_SMT); + break; + case MMIO_MITIGATION_OFF: + break; + } + mutex_unlock(&spec_ctrl_mutex); }