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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id AE79AC433EF for ; Fri, 25 Feb 2022 13:57:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Subject:Cc:To:From:Message-ID:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=4XKWJG+Gbf51fHCnwXcN8Tc0n7knDxgl/RMM3nUGYKs=; b=lsGwr2zsTb0Z2T lQv3qUtM/5MdS4c9rxsvsmZ+GM5UzJS3zeA+jmMIzYZTd6yTxo1sMGSyB/TK0QLqgL9Qltz41aYPQ w2eU7mrvDGeKjvFO4/pGJ7hjKe3Uqp3B2jML1xyg+u6g/qIY2Gg7gyTRnhXMsnlOBOv5cgSamlZtt iNKpAKwxV/dIpORrrPo8UxwvIUYcE6+HLQH9y0ZIXjBAyoZwq/rXi3yUxP1PvMzwfQdRHhexAQi7j yEs61OtGyChxokZ+XRLCXwiXlNu871lKhpfm536UxdJGN4xu0PpGerqbYfv6QgYEQCNsB6qRuo5yp /IIXa+CAtJW17vg5yVyw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nNb52-005H4a-AD; Fri, 25 Feb 2022 13:56:21 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nNb1S-005FZS-OH for linux-arm-kernel@lists.infradead.org; Fri, 25 Feb 2022 13:52:40 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 2919261DEE; Fri, 25 Feb 2022 13:52:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E8351C340E7; Fri, 25 Feb 2022 13:52:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1645797158; bh=efxX3dgYB4aD7VQ/1krpI6bSY0ErZikzLiZwZsi9qyc=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=Wlbw+9/QvTxyFGTpfM9huMfB3nIW6IRmP3oeVWe4K3hXU96eQhO3dt5381toO3UuX oDyXRpgP58f+ICPbwEEFXGHHzwh+Qq/+V1M1TQePTIhgwnwf35+esgRIJeDyN68QCU ynR/Nc5VFdaRKGaislb1tISUZMRNJRSuozh4sXM6P1kUN6TtoQtpW384sT4VoJA67H 0Qver1Fw/XQ5SVI/JuZTJTIIwh9oHPrU3j4f2UHLl67ARk1B3tS5WSrNZgDHek5IAc EpaLPJ1N4Julcsu5sCJrfhsDFNoLg5m1NVRUlrsC/uSW0s5EgJDaBDCWfvwGurt2v2 +Al+brwMAYirw== Received: from sofa.misterjones.org ([185.219.108.64] helo=why.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1nNb1P-00AXZg-KG; Fri, 25 Feb 2022 13:52:35 +0000 Date: Fri, 25 Feb 2022 13:52:35 +0000 Message-ID: <87o82v2gv0.wl-maz@kernel.org> From: Marc Zyngier To: Mark Rutland Cc: linux-arm-kernel@lists.infradead.org, ardb@kernel.org, broonie@kernel.org, catalin.marinas@arm.com, james.morse@arm.com, will@kernel.org Subject: Re: [PATCH] arm64: prevent instrumentation of bp hardening callbacks In-Reply-To: <20220224181028.512873-1-mark.rutland@arm.com> References: <20220224181028.512873-1-mark.rutland@arm.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/27.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: mark.rutland@arm.com, linux-arm-kernel@lists.infradead.org, ardb@kernel.org, broonie@kernel.org, catalin.marinas@arm.com, james.morse@arm.com, will@kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220225_055238_874714_96257E10 X-CRM114-Status: GOOD ( 15.05 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, 24 Feb 2022 18:10:28 +0000, Mark Rutland wrote: > > We may call arm64_apply_bp_hardening() early during entry (e.g. in > el0_ia()) before it is safe to run instrumented code. Unfortunately this > may result in running instrumented code in two cases: [...] > Fixes: ec82b567a74fbdff ("arm64: Implement branch predictor hardening for Falkor") > Fixes: b092201e00206141 ("arm64: Add ARM_SMCCC_ARCH_WORKAROUND_1 BP hardening support") > Fixes: d4647f0a2ad71110 ("arm64: Rewrite Spectre-v2 mitigation code") > Fixes: 0f15adbb2861ce6f ("arm64: Add skeleton to harden the branch predictor against aliasing attacks") > Fixes: 6279017e807708a0 ("KVM: arm64: Move BP hardening helpers into spectre.h") > Signed-off-by: Mark Rutland > Cc: Ard Biesheuvel > Cc: Catalin Marinas > Cc: James Morse > Cc: Marc Zyngier > Cc: Mark Brown > Cc: Will Deacon Acked-by: Marc Zyngier M. -- Without deviation from the norm, progress is not possible. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel