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, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 EB934C07E96 for ; Tue, 6 Jul 2021 14:05:44 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 75C9561952 for ; Tue, 6 Jul 2021 14:05:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 75C9561952 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4GK48Q6fXtz3bhY for ; Wed, 7 Jul 2021 00:05:42 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=none (no SPF record) smtp.mailfrom=lst.de (client-ip=213.95.11.211; helo=verein.lst.de; envelope-from=hch@lst.de; receiver=) Received: from verein.lst.de (verein.lst.de [213.95.11.211]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4GK48168zkz2yM5 for ; Wed, 7 Jul 2021 00:05:20 +1000 (AEST) Received: by verein.lst.de (Postfix, from userid 2407) id 67BF268BEB; Tue, 6 Jul 2021 16:05:13 +0200 (CEST) Date: Tue, 6 Jul 2021 16:05:13 +0200 From: Christoph Hellwig To: Robin Murphy Subject: Re: [PATCH v15 06/12] swiotlb: Use is_swiotlb_force_bounce for swiotlb data bouncing Message-ID: <20210706140513.GA26498@lst.de> References: <20210701074045.GA9436@willie-the-truck> <20210702135856.GB11132@willie-the-truck> <0f7bd903-e309-94a0-21d7-f0e8e9546018@arm.com> <20210705190352.GA19461@willie-the-truck> <20210706044848.GA13640@lst.de> <20210706132422.GA20327@willie-the-truck> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jim Quinlan , heikki.krogerus@linux.intel.com, linux-devicetree , peterz@infradead.org, joonas.lahtinen@linux.intel.com, dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk, grant.likely@arm.com, paulus@samba.org, Frank Rowand , mingo@kernel.org, Jianxiong Gao , Stefano Stabellini , Saravana Kannan , "Rafael J . Wysocki" , Christoph Hellwig , Bartosz Golaszewski , bskeggs@redhat.com, linux-pci@vger.kernel.org, xen-devel@lists.xenproject.org, Thierry Reding , matthew.auld@intel.com, Nicolas Boichat , thomas.hellstrom@linux.intel.com, jgross@suse.com, Will Deacon , Konrad Rzeszutek Wilk , intel-gfx@lists.freedesktop.org, maarten.lankhorst@linux.intel.com, jani.nikula@linux.intel.com, Nathan Chancellor , Rob Herring , rodrigo.vivi@intel.com, Bjorn Helgaas , Claire Chang , Dan Williams , Andy Shevchenko , boris.ostrovsky@oracle.com, airlied@linux.ie, Greg KH , Randy Dunlap , Qian Cai , lkml , "list@263.net:IOMMU DRIVERS" , Daniel Vetter , xypron.glpk@gmx.de, Tom Lendacky , linuxppc-dev@lists.ozlabs.org, bauerman@linux.ibm.com Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Tue, Jul 06, 2021 at 03:01:04PM +0100, Robin Murphy wrote: > FWIW I was pondering the question of whether to do something along those > lines or just scrap the default assignment entirely, so since I hadn't got > round to saying that I've gone ahead and hacked up the alternative > (similarly untested) for comparison :) > > TBH I'm still not sure which one I prefer... Claire did implement something like your suggestion originally, but I don't really like it as it doesn't scale for adding multiple global pools, e.g. for the 64-bit addressable one for the various encrypted secure guest schemes.