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=-2.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, PDS_BAD_THREAD_QP_64,SPF_HELO_NONE,SPF_PASS 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 F2622C4708F for ; Fri, 4 Jun 2021 09:19:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DD1406108D for ; Fri, 4 Jun 2021 09:19:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230128AbhFDJVm (ORCPT ); Fri, 4 Jun 2021 05:21:42 -0400 Received: from mga05.intel.com ([192.55.52.43]:44771 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229930AbhFDJVl (ORCPT ); Fri, 4 Jun 2021 05:21:41 -0400 IronPort-SDR: n52WYoPXpPGRFuxyMgot5+Jguo6Nk3k5aeKsiO1viPeMl+hz89xbO68VFXdn/aFma5R07YeN0S hblg93RfCjxw== X-IronPort-AV: E=McAfee;i="6200,9189,10004"; a="289887251" X-IronPort-AV: E=Sophos;i="5.83,248,1616482800"; d="scan'208";a="289887251" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Jun 2021 02:19:53 -0700 IronPort-SDR: 49HB0+x6dFzrh4+whbIqw4FcM8DoXlK7+jumT4LcoFOeh7Jb0RTOVUA6sf2e1nAk1m4yhEr9HZ 9WIKZBd+Z8bw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.83,248,1616482800"; d="scan'208";a="550472884" Received: from fmsmsx606.amr.corp.intel.com ([10.18.126.86]) by orsmga004.jf.intel.com with ESMTP; 04 Jun 2021 02:19:53 -0700 Received: from fmsmsx608.amr.corp.intel.com (10.18.126.88) by fmsmsx606.amr.corp.intel.com (10.18.126.86) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2242.4; Fri, 4 Jun 2021 02:19:52 -0700 Received: from fmsmsx612.amr.corp.intel.com (10.18.126.92) by fmsmsx608.amr.corp.intel.com (10.18.126.88) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2242.4; Fri, 4 Jun 2021 02:19:52 -0700 Received: from FMSEDG603.ED.cps.intel.com (10.1.192.133) by fmsmsx612.amr.corp.intel.com (10.18.126.92) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2242.4 via Frontend Transport; Fri, 4 Jun 2021 02:19:52 -0700 Received: from NAM04-DM6-obe.outbound.protection.outlook.com (104.47.73.43) by edgegateway.intel.com (192.55.55.68) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2242.4; Fri, 4 Jun 2021 02:19:52 -0700 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=b5jqBhgK2SlSsQREA5LEGVIahd2LuNRJ8pBIXbj2xFBXAA2RxC0XtKwxPaK3lAMCNxq2te9Ot/0MBT5fYi6/ytcVf2q5xDS2CnhzhGtFancfsFqGazB2D7EX6yCxB6sfc6ooEpXzhamVSFaimqu5H77AfzyFIq/cjalVozsMjHRpQCMZEfT7X3Ccyd2l9Ea1UtLDyCDK7RMRPatMfYvZzWftFclCO4yepm0qZkR1QzfgA8huAo7b/02eN7YeOdzDCOsQbK7gNXQySt14jNYFmqSlYciY05NkPaRXZ+r03sJKftAnW1phF5vp7giPGTHgDkjoXRzrM+9Coyqgx4rFTQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=O89T1pKTp24E/jkK4JezTlaOGvtQj85ATEtshEeM484=; b=gkkAyCv1fbcx14Kq9pX7CMkVAH/9DXqKjby8kT4RTGc1EmAEBQRz7eyOd+Nx/D551HleRccrKzNzedoDG74ZFo0UVl11ULV9E4Dzo0GyyJCk7wkIeyx5CRbAjHU3VHwwjnqTtNX2XSJZfiSX6j6M5mgG/vSyK9nQUzTdeNE4S1SpAZM0Z6VW8AQLzHJtM+Xu4M2wHS2UMX4sZpdJB1GBanvDDBUuLXvb0zi/BumhE9NG9bCUjaA2IQDPzzE4sE4PfcSeR2v944L/C7a3BZLiESEkyykA7PoEi3RK423ru2FXHPFPuzaJ5EnJYDM4z/3Ivq7owrt5jnvJhHZNLFR1CQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=intel.com; dmarc=pass action=none header.from=intel.com; dkim=pass header.d=intel.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=intel.onmicrosoft.com; s=selector2-intel-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=O89T1pKTp24E/jkK4JezTlaOGvtQj85ATEtshEeM484=; b=Alm7yTWxJOxDpxpNv51juUBg4HukwXz5lmtplyPqX3snPMxq3ZCw8LOs9d6vaE/cUYB+0MJ+PgHL2TZp0hZQs3O3a8KTO4fEKMrJWS6C2aLNDd6KhzxqLQ2GDJVlWeVNWm1nGOmlBGMNe6aZnUKbHw5xppaKwmJ8aLEgw0XjykM= Received: from MWHPR11MB1886.namprd11.prod.outlook.com (2603:10b6:300:110::9) by MWHPR1101MB2302.namprd11.prod.outlook.com (2603:10b6:301:5a::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4195.23; Fri, 4 Jun 2021 09:19:50 +0000 Received: from MWHPR11MB1886.namprd11.prod.outlook.com ([fe80::6597:eb05:c507:c6c1]) by MWHPR11MB1886.namprd11.prod.outlook.com ([fe80::6597:eb05:c507:c6c1%12]) with mapi id 15.20.4195.023; Fri, 4 Jun 2021 09:19:50 +0000 From: "Tian, Kevin" To: Alex Williamson , Jason Gunthorpe CC: Jean-Philippe Brucker , "Jiang, Dave" , "Raj, Ashok" , "kvm@vger.kernel.org" , Jonathan Corbet , Robin Murphy , LKML , "iommu@lists.linux-foundation.org" , David Gibson , Kirti Wankhede , "David Woodhouse" , Jason Wang Subject: RE: [RFC] /dev/ioasid uAPI proposal Thread-Topic: [RFC] /dev/ioasid uAPI proposal Thread-Index: AddSzQ970oLnVHLeQca/ysPD8zMJZwBL2ymAAKTbxpAAKSt7gAAHpf9wAB1YcAAAAm5sgAAA1YgAAADonIAAAEmcgAABzCaAAAHbfwAAAYTsAAAEeLUAAAiRJwAAAHcmwAAUIS4AABDMegAAGmQXIA== Date: Fri, 4 Jun 2021 09:19:50 +0000 Message-ID: References: <20210602111117.026d4a26.alex.williamson@redhat.com> <20210602173510.GE1002214@nvidia.com> <20210602120111.5e5bcf93.alex.williamson@redhat.com> <20210602180925.GH1002214@nvidia.com> <20210602130053.615db578.alex.williamson@redhat.com> <20210602195404.GI1002214@nvidia.com> <20210602143734.72fb4fa4.alex.williamson@redhat.com> <20210602224536.GJ1002214@nvidia.com> <20210602205054.3505c9c3.alex.williamson@redhat.com> <20210603124036.GU1002214@nvidia.com> <20210603144136.2b68c5c5.alex.williamson@redhat.com> In-Reply-To: <20210603144136.2b68c5c5.alex.williamson@redhat.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-version: 11.5.1.3 dlp-product: dlpe-windows dlp-reaction: no-action authentication-results: redhat.com; dkim=none (message not signed) header.d=none;redhat.com; dmarc=none action=none header.from=intel.com; x-originating-ip: [192.198.142.24] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 3aa965f3-2773-4ccf-775a-08d92739e7c3 x-ms-traffictypediagnostic: MWHPR1101MB2302: x-ld-processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:4941; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MWHPR11MB1886.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(396003)(39860400002)(366004)(376002)(346002)(136003)(8676002)(186003)(5660300002)(478600001)(26005)(9686003)(4744005)(66446008)(8936002)(66556008)(64756008)(2906002)(52536014)(55016002)(66476007)(38100700002)(122000001)(86362001)(7416002)(4326008)(66946007)(6506007)(316002)(76116006)(7696005)(110136005)(54906003)(83380400001)(71200400001)(33656002);DIR:OUT;SFP:1102; x-ms-exchange-antispam-messagedata: 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 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MWHPR11MB1886.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3aa965f3-2773-4ccf-775a-08d92739e7c3 X-MS-Exchange-CrossTenant-originalarrivaltime: 04 Jun 2021 09:19:50.3162 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: kyyHHQAkzqYb3owKVYo+g9U0tfnj98JYRLYXQTw71jDXPffr1kFKwYH34juuESLU+0BfxSixlq9MBPBKS6VK4g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR1101MB2302 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > From: Alex Williamson > Sent: Friday, June 4, 2021 4:42 AM >=20 > > 'qemu --allow-no-snoop' makes more sense to me >=20 > I'd be tempted to attach it to the -device vfio-pci option, it's > specific drivers for specific devices that are going to want this and > those devices may not be permanently attached to the VM. But I see in > the other thread you're trying to optimize IOMMU page table sharing. >=20 > There's a usability question in either case though and I'm not sure how > to get around it other than QEMU or the kernel knowing a list of > devices (explicit IDs or vendor+class) to select per device defaults. >=20 "-device vfio-pci" is a per-device option, which implies that the no-snoop choice is given to the admin then no need to maintain=20 a fixed device list in Qemu? Thanks Kevin 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=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED 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 87104C07E94 for ; Fri, 4 Jun 2021 09:20:21 +0000 (UTC) Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (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 30A756140B for ; Fri, 4 Jun 2021 09:20:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 30A756140B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id E4F7541585; Fri, 4 Jun 2021 09:20:20 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CHZnQNVp9fWx; Fri, 4 Jun 2021 09:20:16 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp4.osuosl.org (Postfix) with ESMTP id 39B9841589; Fri, 4 Jun 2021 09:20:16 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id F25E8C000E; Fri, 4 Jun 2021 09:20:15 +0000 (UTC) Received: from smtp4.osuosl.org (smtp4.osuosl.org [IPv6:2605:bc80:3010::137]) by lists.linuxfoundation.org (Postfix) with ESMTP id 4B19DC0001 for ; Fri, 4 Jun 2021 09:20:15 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id 3670041589 for ; Fri, 4 Jun 2021 09:20:15 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id AIUoLfIRkUoG for ; Fri, 4 Jun 2021 09:20:11 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by smtp4.osuosl.org (Postfix) with ESMTPS id 344CE41585 for ; Fri, 4 Jun 2021 09:20:11 +0000 (UTC) IronPort-SDR: 2NyO4erD6RcHX8fDovSfbApL54lYIyT2s/Dd8g3SGNf6CWDOI5R3r2iTvv7NsyC5UtGm1nCbPZ Vl6se0Eq9yKg== X-IronPort-AV: E=McAfee;i="6200,9189,10004"; a="204069303" X-IronPort-AV: E=Sophos;i="5.83,248,1616482800"; d="scan'208";a="204069303" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Jun 2021 02:19:58 -0700 IronPort-SDR: 49HB0+x6dFzrh4+whbIqw4FcM8DoXlK7+jumT4LcoFOeh7Jb0RTOVUA6sf2e1nAk1m4yhEr9HZ 9WIKZBd+Z8bw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.83,248,1616482800"; d="scan'208";a="550472884" Received: from fmsmsx606.amr.corp.intel.com ([10.18.126.86]) by orsmga004.jf.intel.com with ESMTP; 04 Jun 2021 02:19:53 -0700 Received: from fmsmsx608.amr.corp.intel.com (10.18.126.88) by fmsmsx606.amr.corp.intel.com (10.18.126.86) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2242.4; Fri, 4 Jun 2021 02:19:52 -0700 Received: from fmsmsx612.amr.corp.intel.com (10.18.126.92) by fmsmsx608.amr.corp.intel.com (10.18.126.88) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2242.4; Fri, 4 Jun 2021 02:19:52 -0700 Received: from FMSEDG603.ED.cps.intel.com (10.1.192.133) by fmsmsx612.amr.corp.intel.com (10.18.126.92) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2242.4 via Frontend Transport; Fri, 4 Jun 2021 02:19:52 -0700 Received: from NAM04-DM6-obe.outbound.protection.outlook.com (104.47.73.43) by edgegateway.intel.com (192.55.55.68) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2242.4; Fri, 4 Jun 2021 02:19:52 -0700 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=b5jqBhgK2SlSsQREA5LEGVIahd2LuNRJ8pBIXbj2xFBXAA2RxC0XtKwxPaK3lAMCNxq2te9Ot/0MBT5fYi6/ytcVf2q5xDS2CnhzhGtFancfsFqGazB2D7EX6yCxB6sfc6ooEpXzhamVSFaimqu5H77AfzyFIq/cjalVozsMjHRpQCMZEfT7X3Ccyd2l9Ea1UtLDyCDK7RMRPatMfYvZzWftFclCO4yepm0qZkR1QzfgA8huAo7b/02eN7YeOdzDCOsQbK7gNXQySt14jNYFmqSlYciY05NkPaRXZ+r03sJKftAnW1phF5vp7giPGTHgDkjoXRzrM+9Coyqgx4rFTQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=O89T1pKTp24E/jkK4JezTlaOGvtQj85ATEtshEeM484=; b=gkkAyCv1fbcx14Kq9pX7CMkVAH/9DXqKjby8kT4RTGc1EmAEBQRz7eyOd+Nx/D551HleRccrKzNzedoDG74ZFo0UVl11ULV9E4Dzo0GyyJCk7wkIeyx5CRbAjHU3VHwwjnqTtNX2XSJZfiSX6j6M5mgG/vSyK9nQUzTdeNE4S1SpAZM0Z6VW8AQLzHJtM+Xu4M2wHS2UMX4sZpdJB1GBanvDDBUuLXvb0zi/BumhE9NG9bCUjaA2IQDPzzE4sE4PfcSeR2v944L/C7a3BZLiESEkyykA7PoEi3RK423ru2FXHPFPuzaJ5EnJYDM4z/3Ivq7owrt5jnvJhHZNLFR1CQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=intel.com; dmarc=pass action=none header.from=intel.com; dkim=pass header.d=intel.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=intel.onmicrosoft.com; s=selector2-intel-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=O89T1pKTp24E/jkK4JezTlaOGvtQj85ATEtshEeM484=; b=Alm7yTWxJOxDpxpNv51juUBg4HukwXz5lmtplyPqX3snPMxq3ZCw8LOs9d6vaE/cUYB+0MJ+PgHL2TZp0hZQs3O3a8KTO4fEKMrJWS6C2aLNDd6KhzxqLQ2GDJVlWeVNWm1nGOmlBGMNe6aZnUKbHw5xppaKwmJ8aLEgw0XjykM= Received: from MWHPR11MB1886.namprd11.prod.outlook.com (2603:10b6:300:110::9) by MWHPR1101MB2302.namprd11.prod.outlook.com (2603:10b6:301:5a::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4195.23; Fri, 4 Jun 2021 09:19:50 +0000 Received: from MWHPR11MB1886.namprd11.prod.outlook.com ([fe80::6597:eb05:c507:c6c1]) by MWHPR11MB1886.namprd11.prod.outlook.com ([fe80::6597:eb05:c507:c6c1%12]) with mapi id 15.20.4195.023; Fri, 4 Jun 2021 09:19:50 +0000 From: "Tian, Kevin" To: Alex Williamson , Jason Gunthorpe Subject: RE: [RFC] /dev/ioasid uAPI proposal Thread-Topic: [RFC] /dev/ioasid uAPI proposal Thread-Index: AddSzQ970oLnVHLeQca/ysPD8zMJZwBL2ymAAKTbxpAAKSt7gAAHpf9wAB1YcAAAAm5sgAAA1YgAAADonIAAAEmcgAABzCaAAAHbfwAAAYTsAAAEeLUAAAiRJwAAAHcmwAAUIS4AABDMegAAGmQXIA== Date: Fri, 4 Jun 2021 09:19:50 +0000 Message-ID: References: <20210602111117.026d4a26.alex.williamson@redhat.com> <20210602173510.GE1002214@nvidia.com> <20210602120111.5e5bcf93.alex.williamson@redhat.com> <20210602180925.GH1002214@nvidia.com> <20210602130053.615db578.alex.williamson@redhat.com> <20210602195404.GI1002214@nvidia.com> <20210602143734.72fb4fa4.alex.williamson@redhat.com> <20210602224536.GJ1002214@nvidia.com> <20210602205054.3505c9c3.alex.williamson@redhat.com> <20210603124036.GU1002214@nvidia.com> <20210603144136.2b68c5c5.alex.williamson@redhat.com> In-Reply-To: <20210603144136.2b68c5c5.alex.williamson@redhat.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-version: 11.5.1.3 dlp-product: dlpe-windows dlp-reaction: no-action authentication-results: redhat.com; dkim=none (message not signed) header.d=none;redhat.com; dmarc=none action=none header.from=intel.com; x-originating-ip: [192.198.142.24] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 3aa965f3-2773-4ccf-775a-08d92739e7c3 x-ms-traffictypediagnostic: MWHPR1101MB2302: x-ld-processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:4941; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:MWHPR11MB1886.namprd11.prod.outlook.com; PTR:; CAT:NONE; SFS:(396003)(39860400002)(366004)(376002)(346002)(136003)(8676002)(186003)(5660300002)(478600001)(26005)(9686003)(4744005)(66446008)(8936002)(66556008)(64756008)(2906002)(52536014)(55016002)(66476007)(38100700002)(122000001)(86362001)(7416002)(4326008)(66946007)(6506007)(316002)(76116006)(7696005)(110136005)(54906003)(83380400001)(71200400001)(33656002); DIR:OUT; SFP:1102; x-ms-exchange-antispam-messagedata: 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 MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MWHPR11MB1886.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3aa965f3-2773-4ccf-775a-08d92739e7c3 X-MS-Exchange-CrossTenant-originalarrivaltime: 04 Jun 2021 09:19:50.3162 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: kyyHHQAkzqYb3owKVYo+g9U0tfnj98JYRLYXQTw71jDXPffr1kFKwYH34juuESLU+0BfxSixlq9MBPBKS6VK4g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR1101MB2302 X-OriginatorOrg: intel.com Cc: Jean-Philippe Brucker , "Jiang, Dave" , "Raj, Ashok" , "kvm@vger.kernel.org" , Jonathan Corbet , David Woodhouse , Jason Wang , LKML , Kirti Wankhede , "iommu@lists.linux-foundation.org" , Robin Murphy , David Gibson X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" > From: Alex Williamson > Sent: Friday, June 4, 2021 4:42 AM > > > 'qemu --allow-no-snoop' makes more sense to me > > I'd be tempted to attach it to the -device vfio-pci option, it's > specific drivers for specific devices that are going to want this and > those devices may not be permanently attached to the VM. But I see in > the other thread you're trying to optimize IOMMU page table sharing. > > There's a usability question in either case though and I'm not sure how > to get around it other than QEMU or the kernel knowing a list of > devices (explicit IDs or vendor+class) to select per device defaults. > "-device vfio-pci" is a per-device option, which implies that the no-snoop choice is given to the admin then no need to maintain a fixed device list in Qemu? Thanks Kevin _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu