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,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 98A9CC43331 for ; Tue, 24 Mar 2020 19:48:35 +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 6D88C206F6 for ; Tue, 24 Mar 2020 19:48:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="E7946ruK" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6D88C206F6 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=DvTUu+rNcpolaEhMwwNFC9EPrADGbpTNw9dP0H+aq50=; b=E7946ruK1v5vfY uebDFRKbkVc3W2fBLZmpNeRjeaUpbwLZuYWHMW2xbqEe8lCnJ3CPRZseScZIOw7S1zgCpSd+BDic0 17l2blBYyNS43B7lzNnPyD+/SRF1JCKk+RnjUi34DAmvmQuc/Ml3jlxF6oE4AL5ZMbcwKNRfXwbN5 WcQyk4ZA5wEw+kjNaCstOx3Eaj6oIxDDe2SMuaog+nXaNi5RakNTNYnyh049FXdbWoq+Boau6a/to qPiZN4Fqxs0T9YtR3SuI4wzneuGaJcIGV5bUH/z7lcVx6Vs/ptHCyWw3qkCXDguqvTe4tWaFJdIgj Isevci0wZejRIglykxFQ==; 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 1jGpXN-0004tk-9S; Tue, 24 Mar 2020 19:48:33 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jGpXJ-0004sh-TW for linux-arm-kernel@lists.infradead.org; Tue, 24 Mar 2020 19:48:31 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 9249D31B; Tue, 24 Mar 2020 12:48:25 -0700 (PDT) Received: from localhost (unknown [10.37.6.21]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 13C2A3F71F; Tue, 24 Mar 2020 12:48:24 -0700 (PDT) From: Mark Brown To: Catalin Marinas , Will Deacon Subject: [PATCH 0/3] arm64: Make NOP handling a whitelist Date: Tue, 24 Mar 2020 19:48:19 +0000 Message-Id: <20200324194822.15682-1-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-20200324_124830_000799_B00BC17A X-CRM114-Status: UNSURE ( 7.31 ) 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 Rutland , Amit Daniel Kachhap , 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. 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(-) base-commit: f8788d86ab28f61f7b46eb6be375f8a726783636 -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel