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 63146C4724C for ; Fri, 1 May 2020 12:37:22 +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 3600D20708 for ; Fri, 1 May 2020 12:37:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="gUQU3mSl"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="xdG5uZqW" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3600D20708 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=ywOdC7xJm7Ak94BzLoOsMzovmZ7tIjNdYX44bqYsUsc=; b=gUQU3mSlX6kNlk N5xlrHGfaSY6kK4fukbBk6OZTpHnJOuekLBJtjnIBwecyPh9V5UaWLCAULXOXVCv7gKLAyn5qporN WS2ms29Btc/i+OMwqe3PrVxJk+2n6j8DXn0aPKQDbejAn20wK5Db+CYdCFGa7SYv2PTEjU48iGB3V /hy5GIPAiwq+ppTtNCuN4ncug6y32swkIjoy6k5POcqwPUFMhyJqyXZU0PFnXUha2h26agqpGek8W sGrzV7sGYLq/Nq5nVfgK4v0kIPLxIMzB6DIymadotYxBy07l+9tFSbGNoi3cEBFfW8b7Kfst96lmR aZs7v6e/WnubqM1bmvpg==; 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 1jUUuv-0002Ho-J7; Fri, 01 May 2020 12:37:21 +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 1jUUus-0002H6-Tl for linux-arm-kernel@lists.infradead.org; Fri, 01 May 2020 12:37:20 +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 594B320708; Fri, 1 May 2020 12:37:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588336637; bh=mxVUp9xHB0+XPlVeQHU+C78ZEje0LBDS2MkS+wICdWY=; h=From:To:Cc:Subject:Date:From; b=xdG5uZqWSwtZvKoxvb/BhBryD0ddFQPhSZ6xjnDKXhoEHWYE/XFLIaKaE7ssvCmMW GMyX69jL8NWI6AlcBudSTXRh22w30+mcZLnL4BFRqX6c21fgWfjlB3bsyrkMiSi9Ze rQXtxhjwyb8mz63QzAE0nOIaNPcOkEgSxtYBF5xw= From: Mark Brown To: Catalin Marinas , Will Deacon Subject: [PATCH v3 0/3] arm64: Make NOP handling a whitelist Date: Fri, 1 May 2020 13:37:06 +0100 Message-Id: <20200501123709.6640-1-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-20200501_053718_975201_61EAA32B X-CRM114-Status: GOOD ( 10.36 ) 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. v3: - Correct values for more of the HINTs. - Add constants for additional HINTs - Handle XPACLRI as a NOP along with all the other PAC HINTs. - Update commit messages for greater clarity. - Tweak the comment about what a NOP. v2: - Fix values for BTI HINTs. - Rebase on v5.7-rc3+for-next/bti-user Mark Brown (3): arm64: insn: Don't assume unrecognized HINTs are NOPs arm64: insn: Add constants for new HINT instruction decode arm64: insn: Report PAC and BTI instructions as NOPs arch/arm64/include/asm/insn.h | 28 ++++++++++++++++++++++++-- arch/arm64/kernel/insn.c | 37 ++++++++++++++++++++++++++--------- 2 files changed, 54 insertions(+), 11 deletions(-) -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel