From patchwork Fri Nov 17 18:21:45 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Will Deacon X-Patchwork-Id: 10063149 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 3FF646023A for ; Fri, 17 Nov 2017 18:23:21 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 308A32A9B7 for ; Fri, 17 Nov 2017 18:23:21 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 254AB2AAEE; Fri, 17 Nov 2017 18:23:21 +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=-4.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id CBF052AAC3 for ; Fri, 17 Nov 2017 18:23:20 +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=s6qZ4zdRfdnlV6hZbow5U0LkXeDnG2KhNq09ly7gXaY=; b=IsPSls47RbBkqWG+4U0YE+cgCe cMstEEUOM6fMzIvtQ0HAGTY43eqXuc2F0q4HE5wStbawF0WaSYwZc01ZNhQmbGBIiRkX7iQ7/zcDR M/3Gi7n68Caqf2+TMIIYis0SC/QVb7/DrTwRnpjBbiFFJkJ7mQ2gQPCCCTh5wzVnPufkGYY/HSHUw Fj336HbvqpthRoK1jPcFLOKelBhq2IzdBteIMX+jh/529RUa3/qUaQyAP21dr3cmqp4E1W6WwyfGm zBn7WMMFu2yXE2DdYuf0fpF8EaVd459ANalson5nVG3LZTIG68wR/+P/eyddUs3Rv2MJXJFz+6O8m h6ZaojXg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1eFlII-000697-AN; Fri, 17 Nov 2017 18:23:14 +0000 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70] helo=foss.arm.com) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1eFlHL-0005oZ-Nr for linux-arm-kernel@lists.infradead.org; Fri, 17 Nov 2017 18:22:17 +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 234C615BF; Fri, 17 Nov 2017 10:21:54 -0800 (PST) Received: from edgewater-inn.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id E85993F5A0; Fri, 17 Nov 2017 10:21:53 -0800 (PST) Received: by edgewater-inn.cambridge.arm.com (Postfix, from userid 1000) id 056571AE10C2; Fri, 17 Nov 2017 18:22:02 +0000 (GMT) From: Will Deacon To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 02/18] arm64: mm: Temporarily disable ARM64_SW_TTBR0_PAN Date: Fri, 17 Nov 2017 18:21:45 +0000 Message-Id: <1510942921-12564-3-git-send-email-will.deacon@arm.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1510942921-12564-1-git-send-email-will.deacon@arm.com> References: <1510942921-12564-1-git-send-email-will.deacon@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20171117_102215_798210_0028E4C3 X-CRM114-Status: UNSURE ( 9.41 ) X-CRM114-Notice: Please train this message. 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: mark.rutland@arm.com, keescook@chromium.org, ard.biesheuvel@linaro.org, catalin.marinas@arm.com, dave.hansen@linux.intel.com, sboyd@codeaurora.org, linux-kernel@vger.kernel.org, Will Deacon 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 We're about to rework the way ASIDs are allocated, switch_mm is implemented and low-level kernel entry/exit is handled, so keep the ARM64_SW_TTBR0_PAN code out of the way whilst we do the heavy lifting. It will be re-enabled in a subsequent patch. Signed-off-by: Will Deacon --- arch/arm64/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 0df64a6a56d4..582bbd77c390 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -872,6 +872,7 @@ endif config ARM64_SW_TTBR0_PAN bool "Emulate Privileged Access Never using TTBR0_EL1 switching" + depends on BROKEN # Temporary while switch_mm is reworked help Enabling this option prevents the kernel from accessing user-space memory directly by pointing TTBR0_EL1 to a reserved