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=-6.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,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 859A7C433B4 for ; Tue, 4 May 2021 08:32:46 +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 361AA611AC for ; Tue, 4 May 2021 08:32:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 361AA611AC 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+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=3P7oIkkNZ0Az8gAx/ibRfzU3Ul6c4ckxRycMDhEDaec=; b=qvaVXS5+lf+Aj0A2SPYxdHbnx zLr+2hA4WbyfSTkas7CyOWAQxq4TE+qogUAHHYTH1eRrGjle6/DuaM7eFrab8C91cxzrkRyfbMjwR U8pfLbpl2VUKk/FyAvk1wu9EaUM0lJ9HAIIMwVzwT2cNcs4ps7To/GnxYKGIFHK/uEsIfpIOA45Iu k8Sn34BZSSuHb3zc0QPJYmkAvvThYTBgr/K/moL5ea/Nef/3tmLYnmc+xu/U+nr/F8qUWCWMPPqkM 2AqZCvoYotT8IDzmu/DCh3VZT8Ztfcuion7u84PYzggd2ZBOWd/bTsjs6uQxBvdFOJV7CjMbavcF9 Edwvw6Uaw==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1ldqRt-00FjzO-JV; Tue, 04 May 2021 08:30:34 +0000 Received: from bombadil.infradead.org ([2607:7c80:54:e::133]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1ldqRa-00Fjuy-Mq for linux-arm-kernel@desiato.infradead.org; Tue, 04 May 2021 08:30:23 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=k1H6gR5bqpHyFM9a3JEHzunn9rfwS0P9q2H6xWtuNMk=; b=0hz3or509bpItyzo0chhYPnx8a 1szF69v93JcD3M6YZQubKTJtymsg5yMOyctHteaMt4VFhGjiYeOcNwsMc623wf1VLWVEX6424GPoQ qQiMS5n8aTaCfrZn72g4aLKoHF33u2/HvPfIIBB6u9nH9jkUu+c21PTeBEezzt0ukz2gXT0/UJr98 5izjtwFzRVMbrfc1Q4qACd+vnIoII6fPOJraTfvoetnXQ8WpF+AtMjlb+GN6BDWwRfwG7RJXij0z0 nbzZIMr1EGgNq0gEegXzr770ZG8GbulJSXHPPYM7UP0DV5vRC9InmDt7ak3hpaO1L4e1bIdqEyyGC OkS0JFOA==; Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1ldqRY-003oc3-5K for linux-arm-kernel@lists.infradead.org; Tue, 04 May 2021 08:30:13 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1CEF2613BA; Tue, 4 May 2021 08:30:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1620117011; bh=SA0MPq08S4sIbEu0S/YkhVbAPJQkRS5WeyPcEthMjx8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=MFnRDdSddwFqD0o+BFnn3MH3YKem6HT//4u8RH8EXkPAcQT9SkeWZNklQFzo7wOQB HXvNwJWmMvA1IcwoMACcnxUpimVDq6op2UIEj0NHPacUaNQpBw4mLOKutdV8VHhdzQ tbi/EeK3qbxUA7dPh3UIZZ41LtqvbZG/8B4D6uoz253eQgtYCUPk0Er3JjRnbL04eL H4oTHVChbT7vJKYa+ihaC6dHWLnbIyTxgnUu3h/aBLrSSszNynVwXEeUB1DT7sLR5w jPgVoOqjKc10n+KxOyuvx83dQRxSLi4+E7XR72yx+Z7H4KUyYX+ZtQgT5vCjlgR+J7 RPZjLwKCg+RsA== Date: Tue, 4 May 2021 09:30:05 +0100 From: Will Deacon To: Vikram Sethi Cc: Alex Williamson , Mark Kettenis , Marc Zyngier , Shanker Donthineni , "catalin.marinas@arm.com" , "christoffer.dall@arm.com" , "linux-arm-kernel@lists.infradead.org" , "kvmarm@lists.cs.columbia.edu" , "linux-kernel@vger.kernel.org" , "kvm@vger.kernel.org" , Jason Sequeira Subject: Re: [RFC 1/2] vfio/pci: keep the prefetchable attribute of a BAR region in VMA Message-ID: <20210504083005.GA12290@willie-the-truck> References: <1edb2c4e-23f0-5730-245b-fc6d289951e1@nvidia.com> <878s4zokll.wl-maz@kernel.org> <87eeeqvm1d.wl-maz@kernel.org> <87bl9sunnw.wl-maz@kernel.org> <20210503084432.75e0126d@x1.home.shazbot.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: 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-20210504_013012_272001_E50211AD X-CRM114-Status: UNSURE ( 7.56 ) X-CRM114-Notice: Please train this message. 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, May 03, 2021 at 10:03:59PM +0000, Vikram Sethi wrote: > Will/Catalin, perhaps you could explain your thought process on why you chose > Normal NC for ioremap_wc on the armv8 linux port instead of Device GRE or other > Device Gxx. I think a combination of: compatibility with 32-bit Arm, the need to support unaligned accesses and the potential for higher performance. Furthermore, ioremap() already gives you a Device memory type, and we're tight on MAIR space. Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel