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=-5.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 7CD50C433DB for ; Fri, 5 Mar 2021 19:09:01 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 11AAC64EC9 for ; Fri, 5 Mar 2021 19:09:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 11AAC64EC9 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+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=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Aw3g7kpswnrl+urbBtDGLqH4U6GC1pyoEkWTItTSaWo=; b=iYg5BplLdSloFielt597j5DV1 q9wxLfXZtOx/X5xMc3/ftaZppqRRgM10FOVAaTbblkIB2QXdBdpyiGIHzlMaX1t2HGvDLhykwrr3z qZpJp6i/vjpNx2G8EQUVvocmpePOjNwS1bo1gHSadmHxN2mySwn8JufWe3vdQ0SODLMADubAh85dA kGPX2Zu5qQDs9tOTdLKtjSYedlA+ucbAxrp/JOD4CgKwzuTDqapxpMzv6B5F1YscqheBj1yIc0ufg /mEO7nkJaQMJgRR8+BOpm34TJTK9cqTaEtk4ACcka5lhz+hQwIE9b934SnBj4w/rG2x9oY3WSPLQB sTIcJh8Pg==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lIFnF-00G7FW-Ru; Fri, 05 Mar 2021 19:07:22 +0000 Received: from mail.kernel.org ([198.145.29.99]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lIFn8-00G7Cf-RS for linux-arm-kernel@lists.infradead.org; Fri, 05 Mar 2021 19:07:16 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 7DC1A6509E; Fri, 5 Mar 2021 19:07:11 +0000 (UTC) Date: Fri, 5 Mar 2021 19:07:09 +0000 From: Catalin Marinas To: Marc Zyngier Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, kernel-team@android.com, James Morse , Julien Thierry , Suzuki K Poulose , Will Deacon , Mark Rutland , Alexandru Elisei Subject: Re: [PATCH] KVM: arm64: Ensure I-cache isolation between vcpus of a same VM Message-ID: <20210305190708.GL23855@arm.com> References: <20210303164505.68492-1-maz@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210303164505.68492-1-maz@kernel.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210305_190715_266389_821EB51F X-CRM114-Status: GOOD ( 10.47 ) 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 Wed, Mar 03, 2021 at 04:45:05PM +0000, Marc Zyngier wrote: > It recently became apparent that the ARMv8 architecture has interesting > rules regarding attributes being used when fetching instructions > if the MMU is off at Stage-1. > > In this situation, the CPU is allowed to fetch from the PoC and > allocate into the I-cache (unless the memory is mapped with > the XN attribute at Stage-2). Digging through the ARM ARM is hard. Do we have this behaviour with FWB as well? -- Catalin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel