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=-10.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 7A98FC47095 for ; Mon, 7 Jun 2021 17:22:33 +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 49A476105A for ; Mon, 7 Jun 2021 17:22:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 49A476105A 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=bombadil.20210309; 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=ys1YDOMljIJrX/JIDNhamoSXVefRRrkO6iVVVPIPBY0=; b=PeP4bq17HPqnBV du2xQhuTRY1tJX6YE3KE+4lqVVJGzky77Q9x9IBvkMR0dc5Xb752kjy0Qm7g+z4bm2/FtxDjZZTEb UaBMTSTmIIbHmFzciH5xyFSjeFMWIZiGo4Dxrs9WOofEGoJ/svknYGNqrU0GK1JRfQHruShW8JN6j zFm44i1RdaKBLg+qZnDVn73HZQz6p3TFRxDKnY0eDM7SgB5K5sTsNbrBiaRm+wlWnqzSzgKx/C9y5 /ADA7qTmQBetvpy9/J3Cy8VU//DAyqtu9HnNnsjpQ8ad6IonzVMUu7+bjFXPTjV29wzO/SrVK2frB ehlyd/nHyjrvGI+KYBiQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1lqIw4-004lWa-KQ; Mon, 07 Jun 2021 17:21:12 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1lqIw0-004lVt-CZ for linux-arm-kernel@lists.infradead.org; Mon, 07 Jun 2021 17:21:09 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4ADD76102A; Mon, 7 Jun 2021 17:21:05 +0000 (UTC) Date: Mon, 7 Jun 2021 18:21:02 +0100 From: Catalin Marinas To: Steven Price Cc: Marc Zyngier , Will Deacon , James Morse , Julien Thierry , Suzuki K Poulose , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Dave Martin , Mark Rutland , Thomas Gleixner , qemu-devel@nongnu.org, Juan Quintela , "Dr. David Alan Gilbert" , Richard Henderson , Peter Maydell , Haibo Xu , Andrew Jones Subject: Re: [PATCH v14 7/8] KVM: arm64: ioctl to fetch/store tags in a guest Message-ID: <20210607172102.GB17957@arm.com> References: <20210607110816.25762-1-steven.price@arm.com> <20210607110816.25762-8-steven.price@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210607110816.25762-8-steven.price@arm.com> 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-20210607_102108_461908_C5D66B3E X-CRM114-Status: GOOD ( 12.08 ) 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 Mon, Jun 07, 2021 at 12:08:15PM +0100, Steven Price wrote: > The VMM may not wish to have it's own mapping of guest memory mapped > with PROT_MTE because this causes problems if the VMM has tag checking > enabled (the guest controls the tags in physical RAM and it's unlikely > the tags are correct for the VMM). > > Instead add a new ioctl which allows the VMM to easily read/write the > tags from guest memory, allowing the VMM's mapping to be non-PROT_MTE > while the VMM can still read/write the tags for the purpose of > migration. > > Signed-off-by: Steven Price Reviewed-by: Catalin Marinas _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel