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 57D5DC25B48 for ; Thu, 26 Oct 2023 20:45:32 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qw7DT-0000W9-K7; Thu, 26 Oct 2023 16:44:31 -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 1qw7DR-0000Vt-V6 for qemu-devel@nongnu.org; Thu, 26 Oct 2023 16:44:29 -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 1qw7DO-0004og-FM for qemu-devel@nongnu.org; Thu, 26 Oct 2023 16:44:29 -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=ZUZLIhqfABwqXlo0KkELK6u8x2abWrXk4Ih4QpxxMmM=; b=LpK7/Q4gugJzNzt9s4EWI1qXvy H1TpHV5F8cIDqzyxAbs0Rglam7LklWUf42iMqWYFyNR0pCDrtNETcSvSHyEyhH7vMwQzugMKH+Dfc 7kTBVI4SHflyjkwJR/IaQdH2ZWCjTDTNUlQ+j1FL8XY9V48Cp7Ic+EsrjSTUZti7dU/PLFSdHcLf7 nNqYPCo63HQDYHHRGc2nK2zDRJKIcPR7xcoPCXAOmeQP/dC4JxY9v8pmHNhDOEnhjfnjZydFyvAUp n6Hf6LtkX2ZzauFLEU059vRg7XgXF4FPieTVEm+0WFlpx/7lgEifPkBsh407fxN3kX5aGhXNcSDZs 9jk/NtTQ==; 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 1qw7DH-00H5kG-Fq; Thu, 26 Oct 2023 20:44:19 +0000 Message-ID: <2fb3dfe783bd6226d3addcdccf2e2ef2061b324e.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 21:44:18 +0100 In-Reply-To: References: <20231025212422.30371-1-vikram.garhwal@amd.com> <48b53eefdbcd4e61d09acfd2532ea8721376d0de.camel@infradead.org> <60882a8e4d1e9a446034c5d3dda14aed5e0e25cd.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-mBuMUHCIYxm0FtLQ+6Tw" 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 --=-mBuMUHCIYxm0FtLQ+6Tw Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2023-10-26 at 13:36 -0700, Stefano Stabellini wrote: >=20 > > 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? >=20 > This is not done for performance but for safety (as in safety > certifications, ISO 26262, etc.). This is to enable unprivileged virtio > backends running in a DomU. By unprivileged I mean a virtio backend that > is unable to map arbitrary memory (the xenforeignmemory interface is > prohibited). >=20 > The goal is to run Xen on safety-critical systems such as cars, > industrial robots and more. In this configuration there is no > traditional Dom0 in the system at all. If you=C2=A0 would like to know mo= re: > https://www.youtube.com/watch?v=3DtisljY6Bqv0&list=3DPLYyw7IQjL-zHtpYtMpF= R3KYdRn0rcp5Xn&index=3D8 Yeah, I understand why we're using grant mappings instead of just directly having access via foreignmem mappings. That wasn't what I was confused about. What I haven't worked out is why we're implementing this through an automatically-populated MemoryRegion in QEMU, rather than just using grant mapping ops like we always have. It seems like a lot of complexity just to avoid calling qemu_xen_gnttab_map_refs() from the virtio backend. And if we're going to use this magic region, are we going to start using it for the Xen PV backends in QEMU too, when they want to map grant refs?=20 --=-mBuMUHCIYxm0FtLQ+6Tw 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 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