From patchwork Tue Aug 7 18:14:15 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mian Yousaf Kaukab X-Patchwork-Id: 10559077 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 90E1A14E2 for ; Tue, 7 Aug 2018 18:25:36 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 82FD22A5A9 for ; Tue, 7 Aug 2018 18:25:36 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 74D0B2A7C4; Tue, 7 Aug 2018 18:25:36 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 2EC082A5A9 for ; Tue, 7 Aug 2018 18:25:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=+DIn03qIDksmDpLuXVH8CkeSwsqcmwMpmIQV2GR9vqc=; b=ohQHZ31k5BO9DQOZ8hB6sA3zno COon6+f9yVhMcvAc+jwtAQeDjljb5f8wKpBZmzl/kglbx0WG0B4qdBdnSs2vuE++CqtgwWD2/ZrHW K12I8ADVpuJXT9JEdVDPE4V4IQ9soWeBJOyIpBgm82aIF+jMLDmOql5fwBgp2IcGXY9onsoZJtKRM VD+DE6rJUXl9nVPRV2yJ34RBZTpTzA+YCCZPWu+/L4/ZEXlH3AvVroyKBvRJwHe7PfhIy6xCTKWHI jMLIzvfVZDcgd6g4d8ZDLr3xdI1ZNtMNq8G2oWYEiW1nqVBS9pxwIZJKvGAKbq2p2Mi2vZvESX9Fa TC3uXmkQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fn6fj-00038M-6Z; Tue, 07 Aug 2018 18:25:31 +0000 Received: from mx2.suse.de ([195.135.220.15] helo=mx1.suse.de) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fn6Vm-00057i-G1 for linux-arm-kernel@lists.infradead.org; Tue, 07 Aug 2018 18:15:17 +0000 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id F0B35ACD7; Tue, 7 Aug 2018 18:15:00 +0000 (UTC) From: Mian Yousaf Kaukab To: will.deacon@arm.com, marc.zyngier@arm.com Subject: [PATCH 2/6] arm64: add sysfs vulnerability show for meltdown Date: Tue, 7 Aug 2018 20:14:15 +0200 Message-Id: <20180807181419.15690-3-ykaukab@suse.de> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180807181419.15690-1-ykaukab@suse.de> References: <20180807181419.15690-1-ykaukab@suse.de> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180807_111514_705544_93540D57 X-CRM114-Status: GOOD ( 10.72 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: robert.richter@cavium.com, Mian Yousaf Kaukab , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, cwu@amperecomputing.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Checking CSV3 support directly in case CONFIG_UNMAP_KERNEL_AT_EL0 is not enabled. Signed-off-by: Mian Yousaf Kaukab --- arch/arm64/kernel/cpu_errata.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index dec10898d688..996edb4e18ad 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -22,6 +22,7 @@ #include #include #include +#include static bool __maybe_unused is_affected_midr_range(const struct arm64_cpu_capabilities *entry, int scope) @@ -683,3 +684,26 @@ const struct arm64_cpu_capabilities arm64_errata[] = { { } }; + +#ifdef CONFIG_GENERIC_CPU_VULNERABILITIES + +ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, + char *buf) +{ + u64 pfr0; + u32 csv3; + + if (arm64_kernel_unmapped_at_el0()) + return sprintf(buf, "Mitigation: KPTI\n"); + + pfr0 = read_cpuid(ID_AA64PFR0_EL1); + csv3 = cpuid_feature_extract_unsigned_field(pfr0, + ID_AA64PFR0_CSV3_SHIFT); + + if (csv3 || is_cpu_meltdown_safe()) + return sprintf(buf, "Not affected\n"); + + return sprintf(buf, "Vulnerable\n"); +} + +#endif