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 7F523C25B48 for ; Thu, 26 Oct 2023 20:16:22 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qw6lu-0002wd-SW; Thu, 26 Oct 2023 16:16:03 -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 1qw6lq-0002sC-GK for qemu-devel@nongnu.org; Thu, 26 Oct 2023 16:15:59 -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 1qw6ln-0003QG-BH for qemu-devel@nongnu.org; Thu, 26 Oct 2023 16:15:58 -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=7D50zwl4U/gjB0Vit7MvGrqZWrH8ciRVUjluNdoPx/M=; b=TymR/oQym4kK5hCA2eGGT7hUJl 9aTsTmcIwBaMQoK2ok/2AQZp4eyGuEhtKg9xqytwShRTwHQgw37P8qeU+mXFyBgjyciYhNsciBSVL vcUduHP6zWcZ4xMXwRh+GVlA7sRNfQn9UYpH2PIy7ydHIpaNyZ26OMW1UyC8mKRJMd0B5QlXG9bcM IKZd9VK2ZkW9/xyk6wT6MeOzVuXbncAEnWZhMOjVz3gJp9myGYc3Pu6I0wXzNZonrb6V9s5k/kM5x Q4y1rWClrdXZ+Bus6x7gyJO0T3cPFBkI16mW2PBF0d3qxdINf5JlMX5sRHfaHXOvp682P2prttRsG 8ESaaKKg==; 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 1qw6ld-00Gy6O-Be; Thu, 26 Oct 2023 20:15:45 +0000 Message-ID: <60882a8e4d1e9a446034c5d3dda14aed5e0e25cd.camel@infradead.org> Subject: Re: [QEMU][PATCHv2 0/8] Xen: support grant mappings. From: David Woodhouse To: Stefano Stabellini Cc: Vikram Garhwal , qemu-devel@nongnu.org, jgross@suse.com Date: Thu, 26 Oct 2023 21:15:44 +0100 In-Reply-To: References: <20231025212422.30371-1-vikram.garhwal@amd.com> <48b53eefdbcd4e61d09acfd2532ea8721376d0de.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-jtgVU8kecONqPDLM0tBh" 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 --=-jtgVU8kecONqPDLM0tBh Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2023-10-26 at 11:07 -0700, Stefano Stabellini wrote: > On Thu, 26 Oct 2023, David Woodhouse wrote: > > 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 regi= on for Xen. > > >=20 > > > Enabling grant mappings patches(first 6) are written by Juergen in 20= 21. > > >=20 > > > QEMU Virtio device provides an emulated backends for Virtio frontned = devices > > > in Xen. > > > Please set "iommu_platform=3Don" option when invoking QEMU. As this w= ill set > > > VIRTIO_F_ACCESS_PLATFORM feature which will be used by virtio fronten= d in Xen > > > to know whether backend supports grants or not. > >=20 > > 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? > >=20 > > I found > > https://static.linaro.org/connect/lvc21/presentations/lvc21-314.pdf=C2= =A0but > > I think it's a bit out of date; the decision about how to handle grant > > mappings for virtio devices is still 'TBD'. >=20 > See this presentation: > https://www.youtube.com/watch?v=3DboRQ8UHc760 >=20 > The patch series is for the guest (e.g. Linux) to use grants to share > memory with virtio devices. The plumbing was already done in Linux a > couple of years ago, but QEMU support for it is still missing. Thanks. > > 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? >=20 > First the guest gets a grant reference for the page, then it uses it as > "dma address" to pass to the virtio device. The top bit (1ULL << 63) is > used to signal that the address in question is a grant address. OK, so the guest sets the top bit in the DMA address and that indicates that this is no longer actually a guest physical address, but instead, bits 62-12 are a (starting) grant ref. (And the address *within* the page is still bits 0-11, assuming 4KiB pages). An alternative way of implementing this on the QEMU side would just be to teach the virtio mapping to recognise the "special" format with the top bit set, and call qemu_xen_gnttab_map_refs() directly to get the mapping? This seems like a lot of code to replace that simpler option... is there a massive performance win from doing it this way? Would we want to use this trick for the Xen PV backends (qdisk, qnic) *too*? Might it make sense to introduce the simple version and *then* the optimisation, with some clear benchmarking to show the win? If we're just going to switch to grant mappings, why *aren't* we using Xen PV device models on Arm anyway? Or am I missing the point completely? --=-jtgVU8kecONqPDLM0tBh Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf ItMltrMaXqcESJuK8dtK56NCSrq4iDKaKq9NxOXFmqXX2zN8HHGjQ2b2Xv0v1L5Nk1MQPKA19xeW 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