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=-22.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL 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 B0AA7CA9EB9 for ; Wed, 23 Oct 2019 23:04:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 82CBF20659 for ; Wed, 23 Oct 2019 23:04:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="fVqFjUBl" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2408005AbfJWXEf (ORCPT ); Wed, 23 Oct 2019 19:04:35 -0400 Received: from mail-qk1-f202.google.com ([209.85.222.202]:41362 "EHLO mail-qk1-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733196AbfJWXEf (ORCPT ); Wed, 23 Oct 2019 19:04:35 -0400 Received: by mail-qk1-f202.google.com with SMTP id c13so8260876qko.8 for ; Wed, 23 Oct 2019 16:04:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:message-id:mime-version:subject:from:to:cc; bh=NalAL07f5HutXXwa+1Q4X8qy6hVKEN+PzqVoDq+V0Uc=; b=fVqFjUBlr6WYdeW8nfpaSXUvftzYUbrImmEdERDjPUyQDfW0iAnu5Tq3IkJmWctpxj LJ6qGO7PBSpKC/nTaigcHmYD5jmo3yNToB1i9Y/Yy7FNPjYnr2uElafDiGubQf0bx9pH 2uZH6zm4zFnizaRySLxRApWRh9dW/2NPbr5OC1F8RaMcopR//eMP5EOwMhCo2kQ/0mK3 QCoIaqBYlW1NxwoRptyjEnr+2g8XNQDRpbnsZyQjhnprN/Td4eE6Mgl+KFRLEIbQWpvS i/nKt+kO9HmysD8EpE54gGqeSI4UuY4UOFpQEAYRo7D/bjudKLD2GxH84o8ql4XvrsMV OgVg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=NalAL07f5HutXXwa+1Q4X8qy6hVKEN+PzqVoDq+V0Uc=; b=cq6atjMH2LJ4Fa6lzJcFdpKaeTwO74tkRKHPFcIPSvZp4etGItJCSYcLTmsrH8f0e+ ZGXXFOupPylV7rp2lqPWIAVb5LC+zGtl4/PYIEjlwF8C8Mnavdud6TycqDxgNAoFxhaB GIWq1geggfyuDG5X/fZ6KwA3pk2sldHMM4Xh9VzZE9bDLQNyKqyjR3/n4DNkWwg3nyOZ vI48B9tBjTR6jshEXh6nHaamucUEEIt5wttlnr/RkdpTAHd2+VxKBgV9XWJvmqbQYUg/ dn+T2ywIOlc2/W2ayX0rP8IfrXsNjAAB/U5NPRbOP7ht2cZvZ0VQLRQyproa+HS5nhvf G9tA== X-Gm-Message-State: APjAAAWn55aGJ/pugpEMsYNjPGxmYJPqUJ+Vya09UmrGq9ClbKokZB6M BQFw8hjhkUrCsztknCuXyma5Q6bHX6yzew+oR6qsHEXfyVUmpZuJ11mdwOEYa/p7jVjV8Guv1DP zBPoe2wF5ZGDx1CPqoyIP6lgKSLNsRAjHD2/2qGJDbUmp2jTp2sZQ/etRGmeoU0ee6sXo8oIMy7 UYTGs1PHvS X-Google-Smtp-Source: APXvYqw0XcENs739XemqxMsyAI0zMQW+5s+voNGA4/V6aHUSXDoe2yz7YVHcOPpKrtgCOJv41QD9HgBQ9LZerfb43rA= X-Received: by 2002:ad4:4503:: with SMTP id k3mr11282482qvu.155.1571871872076; Wed, 23 Oct 2019 16:04:32 -0700 (PDT) Date: Wed, 23 Oct 2019 16:04:26 -0700 Message-Id: <20191023230426.200068-1-asteinhauser@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.23.0.866.gb869b98d4c-goog Subject: [PATCH] SYSFS reporting of L1TF on PowerPC. From: Anthony Steinhauser To: linux-kernel@vger.kernel.org Cc: Michael Ellerman , Anthony Steinhauser Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org L1TF affects PowerPC of the same range as Meltdown-US. I tested it personally: https://github.com/google/safeside/pull/52 and it is also admitted in the IBM report: https://www.ibm.com/blogs/psirt/potential-impact-processors-power-family/ Similarly to Meltdown it is effectively mitigated by the rfi_flush. Signed-off-by: Anthony Steinhauser --- arch/powerpc/kernel/security.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c index 7cfcb294b11c..410232e79371 100644 --- a/arch/powerpc/kernel/security.c +++ b/arch/powerpc/kernel/security.c @@ -167,6 +167,18 @@ ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, cha return sprintf(buf, "Vulnerable\n"); } + +ssize_t cpu_show_l1tf(struct device *dev, struct device_attribute *attr, char *buf) +{ + if (rfi_flush) + return sprintf(buf, "Mitigation: RFI Flush"); + + if (!security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV) && + !security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR)) + return sprintf(buf, "Not affected\n"); + + return sprintf(buf, "Vulnerable\n"); +} #endif ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr, char *buf) -- 2.23.0.866.gb869b98d4c-goog