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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 86CB4C25B67 for ; Thu, 26 Oct 2023 16:13:24 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qw2yT-0006cI-HG; Thu, 26 Oct 2023 12:12:45 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qw2yL-0006ac-9z for qemu-devel@nongnu.org; Thu, 26 Oct 2023 12:12:38 -0400 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qw2yI-0002am-5V for qemu-devel@nongnu.org; Thu, 26 Oct 2023 12:12:37 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=KdzLXd6FZC/SeBJt3t4i8z/IR6nKWYEbsqtlCZpmCdw=; b=MQfALjXYQGiWACBwbPx9AhOWhz FRo4YBm7pVwXP4v9FlZtnJ9ODeSYJ5hM595RapGaxDRn9v9pcq/yGKijMY32wXuBeLSaNxrjfUqL/ sQ2+6bGHTPhEjCt2p4NQf3EGqsdwcEhk4bwg/HwxDfcoYf+p6i+7oKFOBb6H58T6JiCwSpDIsvUN0 VPvv/RzZs18PYktYy35QQz7jodhs7z8Uv09Icj109HAQqhJVKgkLE1uLGxr3fb9NeeyBTjfOLFcKo r9lg9khSFTU75/Y8+sisczsEGY5mJFtakZYa0K9VH+l6o0g4Brrt9WEgkHE+rDN7cW8MxOZd67gEZ e5eWnXOQ==; Received: from [2001:8b0:10b:5:a059:f7a9:933a:2236] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qw2yD-00FyiM-Hr; Thu, 26 Oct 2023 16:12:29 +0000 Message-ID: <48b53eefdbcd4e61d09acfd2532ea8721376d0de.camel@infradead.org> Subject: Re: [QEMU][PATCHv2 0/8] Xen: support grant mappings. From: David Woodhouse To: Vikram Garhwal , qemu-devel@nongnu.org Cc: sstabellini@kernel.org, jgross@suse.com Date: Thu, 26 Oct 2023 17:12:28 +0100 In-Reply-To: <20231025212422.30371-1-vikram.garhwal@amd.com> References: <20231025212422.30371-1-vikram.garhwal@amd.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-WCTQ6gZAd/t+pJAaoVA5" User-Agent: Evolution 3.44.4-0ubuntu2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+1fb9ca25523a2d41ea1b+7368+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-WCTQ6gZAd/t+pJAaoVA5 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2023-10-25 at 14:24 -0700, Vikram Garhwal wrote: > Hi, > This patch series add support for grant mappings as a pseudo RAM region f= or Xen. >=20 > Enabling grant mappings patches(first 6) are written by Juergen in 2021. >=20 > QEMU Virtio device provides an emulated backends for Virtio frontned devi= ces > in Xen. > Please set "iommu_platform=3Don" option when invoking QEMU. As this will = set > VIRTIO_F_ACCESS_PLATFORM feature which will be used by virtio frontend in= Xen > to know whether backend supports grants or not. I don't really understand what's going on here. The subject of the cover letter certainly doesn't help me, because we *already* support grant mappings under Xen, don't we? I found https://static.linaro.org/connect/lvc21/presentations/lvc21-314.pdf but I think it's a bit out of date; the decision about how to handle grant mappings for virtio devices is still 'TBD'. Can you talk me through the process of what happens when a guest wants to a virtio device to initiate 'DMA' to one of its pages? I assume it starts by creating a grant mapping, and then taking the gntref and... then what? I don't see any changes to the virtio devices themselves in this series; are we doing something that will make it work by magic? 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