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=-3.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, URIBL_BLOCKED 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 B198CC169C4 for ; Thu, 31 Jan 2019 17:54:55 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8320420881 for ; Thu, 31 Jan 2019 17:54:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="szWzRdzl" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8320420881 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=NAMFZ0njvY5mkKxzvwQJBZwU+BbEDXVIoOlNuqpA3+4=; b=szWzRdzlhRYp3L C7JJ9lLFRUfDu8i+080/Gb7yaB2uiBpc7uKCTzKO2hvMX9e+rIoCkQpJ4arKgvQB4FW5/9yAVQQGT 6x7o+bKyoVxlXRZ5ZCgQ3k7s93IXXDaPwo844Eyb1MCwjTao0klj+50uif7Ln0N/m8Cfl5eLI/EU8 AhFXulqODwInQ/bL4jyRuotZk0wE8w+uMmFuGFkwxMMVqcL/wv+NVGzKEzB+/6PzohcIqWs6IHDIk VCr4Fu5Fm8Imf0K/9tEoiniyI/bwC0fn0s0QXk5vTyhDEgcqxUxggiFdzP/hfBlmjyh4gqtN+6XHw UhW45dfBvtzbQ3v4qgeA==; 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 1gpGY6-0005OR-Fk; Thu, 31 Jan 2019 17:54:50 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gpGXy-0005Kz-C7 for linux-arm-kernel@lists.infradead.org; Thu, 31 Jan 2019 17:54:44 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id E59DFEBD; Thu, 31 Jan 2019 09:54:41 -0800 (PST) Received: from donnerap.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 806C13F59C; Thu, 31 Jan 2019 09:54:39 -0800 (PST) Date: Thu, 31 Jan 2019 17:54:36 +0000 From: Andre Przywara To: Jeremy Linton Subject: Re: [PATCH v4 08/12] arm64: Advertise mitigation of Spectre-v2, or lack thereof Message-ID: <20190131175436.1c24f7b8@donnerap.cambridge.arm.com> In-Reply-To: <20190125180711.1970973-9-jeremy.linton@arm.com> References: <20190125180711.1970973-1-jeremy.linton@arm.com> <20190125180711.1970973-9-jeremy.linton@arm.com> Organization: ARM X-Mailer: Claws Mail 3.17.3 (GTK+ 2.24.32; aarch64-unknown-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190131_095442_424741_D67E7BB5 X-CRM114-Status: GOOD ( 14.34 ) 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: stefan.wahren@i2se.com, mlangsdo@redhat.com, suzuki.poulose@arm.com, marc.zyngier@arm.com, catalin.marinas@arm.com, julien.thierry@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, steven.price@arm.com, shankerd@codeaurora.org, ykaukab@suse.de, dave.martin@arm.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, 25 Jan 2019 12:07:07 -0600 Jeremy Linton wrote: > From: Marc Zyngier > > We currently have a list of CPUs affected by Spectre-v2, for which > we check that the firmware implements ARCH_WORKAROUND_1. It turns > out that not all firmwares do implement the required mitigation, > and that we fail to let the user know about it. > > Instead, let's slightly revamp our checks, and rely on a whitelist > of cores that are known to be non-vulnerable, and let the user know > the status of the mitigation in the kernel log. Yeah, this looks better, I was scratching my head about that blacklist already. > Signed-off-by: Marc Zyngier > [This makes more sense in front of the sysfs patch] > [Pick pieces of that patch into this and move it earlier] > Signed-off-by: Jeremy Linton Reviewed-by: Andre Przywara > --- arch/arm64/kernel/cpu_errata.c | 104 +++++++++++++++++---------------- > 1 file changed, 54 insertions(+), 50 deletions(-) > .... _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel