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=-4.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=no 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 D4443C5DF62 for ; Wed, 6 Nov 2019 10:50:21 +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 A08422173E for ; Wed, 6 Nov 2019 10:50:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="m0ZR9Kpv"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="A4GjfWnI" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A08422173E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org 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:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: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:In-Reply-To: References:List-Owner; bh=dEm6fosn7XOxg9qkptyAqG54wqVo1feB9/DAnqGFNC8=; b=m0Z R9KpvlVM0K6OvZ+Sl9XWq1djPHYIyYvLxo6436D/FxJcwJnD8t/X9H/wnoTXKWJu4zDJbixfCqsm1 kmNk8i3k5/ef9ly8PXPCGvWJtamJLQzeAKxnS3eiEqQjllPEbnxajHp4mBhrE893dzdCB6CIIFcfz Hl3Jj/wchhGkf8ezU2g69dSKI5+8XAfNv/ep3jnz518kiQkSN6YnYxSu1nvDQIQ1BLueA9y7O0v4K vPBSuRRdMN757Az79//5iJI4jIpFqIu8tua3ngDGFSsblqBo3PKyO7jcMq/CLb0RY10ZEkw5q3yik /skkjwXD2puFb9NvPtwZ4sB9dG6g+bA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iSItI-0004TJ-QN; Wed, 06 Nov 2019 10:50:20 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1iSItG-0004Sr-2M for linux-arm-kernel@lists.infradead.org; Wed, 06 Nov 2019 10:50:19 +0000 Received: from e123331-lin.home (lfbn-mar-1-643-104.w90-118.abo.wanadoo.fr [90.118.215.104]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id EA3FD2173E; Wed, 6 Nov 2019 10:50:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573037417; bh=apu/aSgk5VU7sztBGhlYeJt0ZkxuwMmyQZF3y5kqomQ=; h=From:To:Cc:Subject:Date:From; b=A4GjfWnIPQIGDdom32LyLSzIMTdOwDm6vkb4/tIDE4sqZ6t8ZxKvIVGfLb7TexKh7 yKcHISL4/63FwHMOf/160Fc7fCDvSn7B4BCJzTH79cLVWpwOp5ldbOkhm44eEcsLAM NDYbfzrnsccBGGrVx28oY2X3owawWs1X4TEsQKj8= From: Ard Biesheuvel To: linux-arm-kernel@lists.infradead.org Subject: [PATCH resend 0/2] ARM/decompressor: deal with disabled CP15 barrier instructions Date: Wed, 6 Nov 2019 11:49:16 +0100 Message-Id: <20191106104918.26397-1-ardb@kernel.org> X-Mailer: git-send-email 2.17.1 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191106_025018_134943_34A4ABC7 X-CRM114-Status: UNSURE ( 9.28 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: maz@kernel.org, rmk+kernel@armlinux.org.uk, linus.walleij@linaro.org, Ard Biesheuvel MIME-Version: 1.0 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 [ Resending because --cc-cover didn't take ] While trying to test my v4.4 backport of the firmware/hypervisor based spectre v1/v2 mitigations for 32-bit ARM, I noticed that KVM/qemu failed to boot my kernel while it booted fine under TCG emulation. As it turns out, KVM/qemu may instantiate the VCPU with support for CP15 barrier instructions disabled, causing them to UNDEF and crash the decompressor. I already fixed the same issue for UEFI boot, but since v4.4 does not support that, I only noticed now that this is an issue for bare metal as well. Cc: Russell King Cc: Linus Walleij Cc: Marc Zyngier Ard Biesheuvel (2): ARM/decompressor: avoid CP15 barrier instructions in v7 cache setup code Revert "ARM: 8857/1: efi: enable CP15 DMB instructions before cleaning the cache" arch/arm/boot/compressed/head.S | 51 ++++++++++---------- 1 file changed, 26 insertions(+), 25 deletions(-) -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel