From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [78.32.30.218]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8CC177C for ; Wed, 30 Mar 2022 18:45:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=uU3vvHpm/VWpD6ZwYjcquWBCaaS4a6DtSrLVV4a15KQ=; b=JfcFYiNokfJixkPVp0WMCXHgVJ +liwnICyziJgvHmE1FrZSenf6cAa/KaSzKCso8Xiw3IXPX5n64dbFEy5/CfkMb4AcU4AEBY1mOJw8 eqNdRMZ5KGKr9f0v4fK5H5BN+2o95IZWg4qYT9tnN0RRwh/3FBfVmzL8OmywKMAieW2ZMldACZErv sl9NFv8hyrSzF7ndOQMZr9BYgqEz/rfpoZxVbOsRvQRfq1cyvojZ2+WYZKvqHk21nM5+cLYz+pXYm pWluMM27Ar5fDOIB/aM0VFZNLetVT7n/XucbfMptssHaVdMr6vS8DAyr78pk7ywhJPU1b9vJVzGDx a2ypv0Pw==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:58028) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1nZdJl-0003ae-Ma; Wed, 30 Mar 2022 19:45:17 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1nZdJj-0006s1-PZ; Wed, 30 Mar 2022 19:45:15 +0100 Date: Wed, 30 Mar 2022 19:45:15 +0100 From: "Russell King (Oracle)" To: Christian Eggers Cc: Ard Biesheuvel , Linux ARM , Catalin Marinas , Linux Kernel Mailing List , llvm@lists.linux.dev, Nathan Chancellor Subject: Re: CONFIG_THUMB2_KERNEL=y boot failure after Spectre BHB fixes Message-ID: References: <10062923.nUPlyArG6x@localhost.localdomain> <1896453.PYKUYFuaPT@localhost.localdomain> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1896453.PYKUYFuaPT@localhost.localdomain> Sender: Russell King (Oracle) On Wed, Mar 30, 2022 at 08:27:56PM +0200, Christian Eggers wrote: > On Wednesday, 30 March 2022, 19:42:31 CEST, Ard Biesheuvel wrote: > > Thanks for confirming. The first fix affects all Thumb2 > > configurations, my patch only affects Thumb2 configurations that > > actually enable the loop8 mitigation for Spectre-BHB. > > > > What type of CPU are you booting on? > > NXP i.MX6ULL (ARM Cortex-A7). As Cortex-A7 is not listed in Arm Ltd's table for speculative processor vulnerabilities, the kernel doesn't implement any workarounds. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last! 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id CC2DFC433EF for ; Wed, 30 Mar 2022 18:46:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc: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=Ni9B1cD50yjy8kO7k6+mCQbNpYwbyzLDEXiX3pPMRgo=; b=u2QuJxJ6qUvS61 xCqRFPFlRYABzexvfk1nl5CQHp6mvQ6X4KSviqBBqxPPLHJjUn54uJ9OQOsgCzjFyNEO23r7T0etm sYQvm856lRn278vMnWvkLki9dYY7BydwJkOBxU+4H7r+NtXEowQ0pNzr0rN0rPXFeLtqCWc7uTr1l nzenaK1uiIhze7+Lll531LicYVlWE+QbHikDMZM0y7rVT2qmPyw0ZJUguCF89MGrTSdhZOIb6Hmce 7A2CWdF0/c2aYBp3XxzRye+IJoz/+ragqZAjrqE4hRXSyTMoR6W4Q2+RUT+VgqNE8izi4fAUmShxn scuXOoS+vWdpiWgwQYqg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nZdJr-00HBJU-91; Wed, 30 Mar 2022 18:45:23 +0000 Received: from pandora.armlinux.org.uk ([2001:4d48:ad52:32c8:5054:ff:fe00:142]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nZdJo-00HBJ3-33 for linux-arm-kernel@lists.infradead.org; Wed, 30 Mar 2022 18:45:21 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=uU3vvHpm/VWpD6ZwYjcquWBCaaS4a6DtSrLVV4a15KQ=; b=JfcFYiNokfJixkPVp0WMCXHgVJ +liwnICyziJgvHmE1FrZSenf6cAa/KaSzKCso8Xiw3IXPX5n64dbFEy5/CfkMb4AcU4AEBY1mOJw8 eqNdRMZ5KGKr9f0v4fK5H5BN+2o95IZWg4qYT9tnN0RRwh/3FBfVmzL8OmywKMAieW2ZMldACZErv sl9NFv8hyrSzF7ndOQMZr9BYgqEz/rfpoZxVbOsRvQRfq1cyvojZ2+WYZKvqHk21nM5+cLYz+pXYm pWluMM27Ar5fDOIB/aM0VFZNLetVT7n/XucbfMptssHaVdMr6vS8DAyr78pk7ywhJPU1b9vJVzGDx a2ypv0Pw==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:58028) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1nZdJl-0003ae-Ma; Wed, 30 Mar 2022 19:45:17 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1nZdJj-0006s1-PZ; Wed, 30 Mar 2022 19:45:15 +0100 Date: Wed, 30 Mar 2022 19:45:15 +0100 From: "Russell King (Oracle)" To: Christian Eggers Cc: Ard Biesheuvel , Linux ARM , Catalin Marinas , Linux Kernel Mailing List , llvm@lists.linux.dev, Nathan Chancellor Subject: Re: CONFIG_THUMB2_KERNEL=y boot failure after Spectre BHB fixes Message-ID: References: <10062923.nUPlyArG6x@localhost.localdomain> <1896453.PYKUYFuaPT@localhost.localdomain> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1896453.PYKUYFuaPT@localhost.localdomain> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220330_114520_158507_73C9D34E X-CRM114-Status: GOOD ( 10.99 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Mar 30, 2022 at 08:27:56PM +0200, Christian Eggers wrote: > On Wednesday, 30 March 2022, 19:42:31 CEST, Ard Biesheuvel wrote: > > Thanks for confirming. The first fix affects all Thumb2 > > configurations, my patch only affects Thumb2 configurations that > > actually enable the loop8 mitigation for Spectre-BHB. > > > > What type of CPU are you booting on? > > NXP i.MX6ULL (ARM Cortex-A7). As Cortex-A7 is not listed in Arm Ltd's table for speculative processor vulnerabilities, the kernel doesn't implement any workarounds. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel