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 71DBEC83000 for ; Tue, 28 Apr 2020 17:24:57 +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 237932082E for ; Tue, 28 Apr 2020 17:24:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="BU5am+lW"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="pWSExpCm" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 237932082E 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:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version: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=5RpLJPDN+GftpBSqA84pb/9y9zYi4yL+rlyA6NBGhEw=; b=BU5am+lWt1yOJQ L6v6jPiRnBWYL/Jn+CCGN9gXkm8K1/my5YABp1GZU/7phbyXLBAwy5yR6gWa0zDI2o8XwCjJDkWhR oxV7vauXzvkRsetjodWD1QkcaSNM1pnlDA1ATn09hAYFr57tePEOB8kqO7BBy2OqOSQ4NsvmhOFQU MoGluQY9cZASHRrdRr6QIRZ0QJ2ZwZMf8oH0SZhYFm9Hh4NkiLbBxe24DtOboXxp/lU2pO1AvBA7n 4UYDsIxFyoN6hKsIT0HE4OSw9715IyJAEW2AFtzVTcTi0dGqvFj5DOjRAycHId2fy8xwkWYya9IBy IyE7VnAl2ayc30yyVU6w==; 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 1jTTyZ-00062l-8S; Tue, 28 Apr 2020 17:24:55 +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 1jTTyJ-0005pA-7V for linux-arm-kernel@lists.infradead.org; Tue, 28 Apr 2020 17:24:40 +0000 Received: from localhost (fw-tnat.cambridge.arm.com [217.140.96.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4D81A2082E; Tue, 28 Apr 2020 17:24:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588094678; bh=dCjczGmbn8izieERkIWSm7odT9zdp5D2fBB3CYFqzxQ=; h=From:To:Cc:Subject:Date:From; b=pWSExpCmMaoDzwWmDT1Dr91VzWLn/HI7yUy6+4Wfh/yFXZpruk1DJ6pTx/TBvPVid 9vGDzSaDrs0GEykMwnE23GL91B9kYzwjBFpbYO6zOBT/9Jn7p0zjXhUBFjbLMJjWeo I2p07KUd/hydFzsVXGIiWQcZwCt3p0NSrYiKUExQ= From: Mark Brown To: Will Deacon , Catalin Marinas Subject: [PATCH v2 0/3] arm64: Make NOP handling a whitelist Date: Tue, 28 Apr 2020 18:24:30 +0100 Message-Id: <20200428172433.48830-1-broonie@kernel.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200428_102439_318612_7C3A258E X-CRM114-Status: UNSURE ( 8.62 ) 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: Mark Brown , 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 Currently we default to assuming any unrecognized instruction in the hint space can be safely handled as a NOP. This is not robust and any code that really wants a NOP should be using the explicitly defined NOP so let's instead invert this and whitelist those instructions which it is safe to handle as NOPs. Patch 2 adds defines for the HINTs for BTI landing pads which will be used by the in-kernel BTI series to generate landing pads in JITed BPF code so it'd be good if this could be applied on or merged into the BTI branch. v2: - Fix values for BTI HINTs. - Rebase on v5.7-rc3+for-next/bti Mark Brown (3): arm64: insn: Don't assume unrecognized HINTs are NOPs arm64: insn: Add constants for PAC and BTI instruction decode arm64: insn: Report PAC and BTI instructions as NOPs arch/arm64/include/asm/insn.h | 22 ++++++++++++++++++++-- arch/arm64/kernel/insn.c | 32 ++++++++++++++++++++++++-------- 2 files changed, 44 insertions(+), 10 deletions(-) -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel