From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from NAM11-BN8-obe.outbound.protection.outlook.com (mail-bn8nam11on2055.outbound.protection.outlook.com [40.107.236.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 593174C62 for ; Wed, 4 Jun 2025 01:35:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.236.55 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749000919; cv=fail; b=UwJTtLxQtPHo9hMzcVwRgWwxzZc9gv4S3xG194yMvTUFQ1SEO9A3G9/36B9llXv8WmvLH876Kwbawn1agAqZLewYNr7qUprVH8hnJtFGNv20eYnNcYKSpSp/L+LAkzHP854vYwqp93ooawHgOfxj/0wsLgw8TqKkADIFmUkvk00= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749000919; c=relaxed/simple; bh=J/w+jdgr4V/ld2gg4RopkO5B9o/IUV4Z6e8Wev/h6BM=; h=Message-ID:Date:Subject:To:Cc:References:From:In-Reply-To: Content-Type:MIME-Version; b=f230/Eb0/M5gNDtEpTPTk4FN2quvP8vaag4Du2FJOFQ4POpP/MYeU8P2UPA8NRBRw11z4mxgF1EHbRmIhJytDk7t0ac1ZCunvh+ZBosGtevNnOZJT3R0sl7zEHQM4TndJkPeW2Vx3F1VQiSWn4sFeFvxP/N9elERHlcFOO7MiWM= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com; spf=fail smtp.mailfrom=amd.com; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b=x6VlNViB; arc=fail smtp.client-ip=40.107.236.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=amd.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="x6VlNViB" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=M+j6HoV4rk0K3Dnlk8d+KOAXeBoduHyYuaE2vDtqTTHJ+CzdMtLN00phOiuhXPhpSIwQY1c0LyjU38gpIlFVXsuTl5zLizCTBhIudV2KIDUw1xqxt/ekkdPiDnZ2RO27aOxfbA4AYyiLnpSlNTnG5btRkFda+f7OquVtUWBG/q77e1FCas4/bV0LOFa4B4wOfwE7JXS0ytJeqOfH9cOi9HK/2xBIbh0BsA+dCLv4Wc6cjOYD3BVafkbMgXHcA6JWvxMGoJa1SlXQqCMFjnxAsHiB1AY/qhj4rI+Q+Xl8A95vd63hpgNTtPNTOfjnecVJitezzAOVz/G4d23q4Rq4qQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=PLYOv7YdwLds4cQxnZuHh369TuhSL499Dnq0w5ItgUI=; b=pb0mxAUGTlJfWnt+Kpv6bUf0qVLBq5ewqdyT6GVM94dixSsjKy7PrcVf7VvU7CjINubtNOgRoGbw9LHJY7dkd8P0LQml1HuwEaJhBFLzqmPUkm7RgZJIop15NsWK+aW6rrc8mDc9PwirGnQmJcg74BDDcm1bavyRwL/d9EumCIumS7HrKNENW/gbyJvrRl2EGnbgNgrJ3uckbQ8ipntVpW6OFvfRD8J/NhgRd4pxSouyrXiST2VcXwszrc1sZGEOAn3ptsnsp33CqxdkWQT1a9hZ5tEU6TfQalpTlwZpaWJICsv79NLfPosgK0xkxA2XpfjJIgon1ypKm3YQYxRDgw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=amd.com; dmarc=pass action=none header.from=amd.com; dkim=pass header.d=amd.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=PLYOv7YdwLds4cQxnZuHh369TuhSL499Dnq0w5ItgUI=; b=x6VlNViBLt8yYO1QjbAXkVFbmKwYGb/Za64ORI//d5qQ1LDCAKnk06wCZHl2Dd7+USIHutT0LJMUGmafBOPI8PYeedtk/a5QHV9HHskFJ1XiY8h311sWkTDYjuRDS82V2sUhbzlfEn3qu/RmM2K559Z6GsbdYpsxwrsUJrtD5bQ= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from CH3PR12MB9194.namprd12.prod.outlook.com (2603:10b6:610:19f::7) by MN0PR12MB6103.namprd12.prod.outlook.com (2603:10b6:208:3c9::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8769.36; Wed, 4 Jun 2025 01:35:14 +0000 Received: from CH3PR12MB9194.namprd12.prod.outlook.com ([fe80::53fb:bf76:727f:d00f]) by CH3PR12MB9194.namprd12.prod.outlook.com ([fe80::53fb:bf76:727f:d00f%5]) with mapi id 15.20.8769.037; Wed, 4 Jun 2025 01:35:12 +0000 Message-ID: <53c7523b-5cf3-4047-831f-12e0422cdf5d@amd.com> Date: Wed, 4 Jun 2025 11:35:05 +1000 User-Agent: Mozilla Thunderbird Beta Subject: Re: [PATCH v3 12/13] PCI/TSM: support TDI related operations for host TSM driver To: Dan Williams , Suzuki K Poulose , "Aneesh Kumar K.V" , Xu Yilun Cc: linux-coco@lists.linux.dev, linux-pci@vger.kernel.org, gregkh@linuxfoundation.org, lukas@wunner.de, sameo@rivosinc.com, jgg@nvidia.com, zhiw@nvidia.com References: <20250516054732.2055093-1-dan.j.williams@intel.com> <20250516054732.2055093-13-dan.j.williams@intel.com> <1bcf37cd-0fc4-40fa-bcd1-e499619943bd@amd.com> <5d8483bb-ceb7-4ef3-920c-d6286a7de85d@arm.com> <683f7b6fec30f_1626e100ab@dwillia2-xfh.jf.intel.com.notmuch> Content-Language: en-US From: Alexey Kardashevskiy In-Reply-To: <683f7b6fec30f_1626e100ab@dwillia2-xfh.jf.intel.com.notmuch> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SY6PR01CA0091.ausprd01.prod.outlook.com (2603:10c6:10:111::6) To CH3PR12MB9194.namprd12.prod.outlook.com (2603:10b6:610:19f::7) Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PR12MB9194:EE_|MN0PR12MB6103:EE_ X-MS-Office365-Filtering-Correlation-Id: 909442f7-b5c9-4551-e066-08dda3080c46 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|7416014|376014|1800799024; X-Microsoft-Antispam-Message-Info: =?utf-8?B?UXh4UHFVYWs1V3ZrQ2NKckh6dVg0bU9ZQ2E4d1hPaWREbzlpMUFrVERJNHh4?= =?utf-8?B?WHFJbmxKSUJpaVRGNFQ1bGMxNkdvQzdOY2JrRC9zVnZQbEhqeUdPR1dVU1dr?= =?utf-8?B?UUlsc0l1ZzRzTFlPaC9qcDNSd0FVc1UvZFE1K240N2xHR0tYd1k4Mm5lZ3Rm?= =?utf-8?B?ZmJ1T2MvTXBwMU9CM3QxSHEzVkJSWjk1UjJyR0pBT1Q5aUhoU205Uy85eXk2?= =?utf-8?B?VmxxRVUzaUhNZEFTZ1k1RE5oc1MyeU9mdERHdXFhS2pXNkdYdGRoajd1aTVD?= =?utf-8?B?VHdadnJ6dG1zRTJweWFMVUpaM2JTQ215b0RCUlhQOUJ6Z1F0K25maWExNWRk?= =?utf-8?B?UEswWThkeFlCYlR4c3dsSU9ScG0zVzkyaThKQmdVKzRlc1g0alBSbUdNb2xo?= =?utf-8?B?SW9NZEpNZWE0MWFUbm1VSzhodHkrZklKaEZkV1l5WTdCWVBoSGdNUTFoYnRp?= =?utf-8?B?cE1xdDNGNVkxZFJyN3V4MmtCNzFpZ1RibnZhQjVNNFp2R2p6VWt1L1FKenhy?= =?utf-8?B?cFBJUGdOOUd2NEdkalZoZS90bTZjcksxc0NhcDdVREJIb3MxL2oyd3kzNURB?= =?utf-8?B?ckpPUXliTHA1Y1dXWE9ORi8va3hZaDdUYnF4WDRjcE44NW5YZzZuWWhIVzNN?= =?utf-8?B?Njl6RFI5TDJMcnlZeUExYUlaQzM4Ri9XSmVKang5NnRkNStRWG1OOVBRM1Qx?= =?utf-8?B?U0ZaeTUyaU9pVWs1NTFxWnhyejJRNG1DQkY4V3lWUGlUakN0NGhtZG5lZWhV?= =?utf-8?B?aE10ZXlOSEUwM0llMGNGek1rRTV0Wm1iMXpxOTVKY1FRVkluOFpldjdLQjdl?= =?utf-8?B?L3M4MndPTk0xbVZ2NjdxQjdPb0RjdERjWFFuSUFMR3ZpQ1c2TXZXTUNoWjlR?= =?utf-8?B?S3FWRG5jblpXNndxZzhsVllZTFFRSHh5NGxDNkhkWi9UU2tNalBhVzZUTlF4?= =?utf-8?B?NVZJSXQ0VVJ4amg2ZUhRZGpWNkNkcmJoZEphN016NitkMTQwckJSODZNUVVh?= =?utf-8?B?dXhRL1lrQ1VRT1hlamFsWWpsK212REJOalY2SUljRDF2dktXVCtyT0xsMGlh?= =?utf-8?B?Zm81TTNncmI2bFVXTlkwM1JpcjhSbTk4dFlGVkgrZFFFT2pDbXNNY0VHRXJQ?= =?utf-8?B?dXd2dEN2anFUT1o4M0pNZ1g1aEp2cThybjZibFF1dlNGMmZRdHVSZWtHbU5m?= =?utf-8?B?QzU5TkhSejBjMzZ4WExxSjlManF0d0k5aGk0UHJlSWkvTXVwMUF4QnlFdmd6?= =?utf-8?B?Q0xTajhpU0VNcVFDWTROcjNmV0VBS2xDZkxmbEdSUERvcGhKM1hOTFhwSEsy?= =?utf-8?B?Q0RrSVFwYzk4QTRteGRMWTBNT01SMHNucGtMay9kcDQxNDVDYXlFdmpCZ1Nh?= =?utf-8?B?YTV3VXliamsreGZmOHd6TFFvTG0xem9lUjQ3eE5uTnQ3eXc2RWxsa2FKOVZu?= =?utf-8?B?clZtSUNVRHZNYWxKOGR4elpET1F2UGFHKzhVMFRoemdySm5iMFd3RmV3dS9U?= =?utf-8?B?bWI4SE5ObnZqTW9Na3hFdld5Q0pYVHcvek9od3lLcWtiRkxsakp3ajdWbENT?= =?utf-8?B?eE43aElDOCs1OGNZeXljcWMvSXNaQy9mbnArcnZ5VVpJWTZqNTVJOUVTd2Nt?= =?utf-8?B?MVBBZy9aVk5UckpzL1N4MGVxN1JTS1JXZldPOFBRNndjL3lDSEdHYWR4ajFW?= =?utf-8?B?bk5hTGs5blFVMlJDSUpmZ1RmcWtYdGluclhpVUpJNzZpZmREYmpNTm5wL3c0?= =?utf-8?B?b3NwUWRpeHpJWGQ1MFRiZm5qbEp5Y2wwMCthb3I3OGNlb243aE0rRXZ2RlVG?= =?utf-8?B?YUFQemVIU3dtN3lqOVJhRzRxcUZpZUNreTdhUFNMYmFteXZPMTlXUEFNbEZm?= =?utf-8?B?ZVI1SDdjNkpvYkFYWVhtYlRnbEhEYnZnRTFoRTdNNzVzWk1oOWk1QXhVTmlJ?= =?utf-8?Q?WVVuxoQcPug=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CH3PR12MB9194.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(7416014)(376014)(1800799024);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?L0xKM1Zsb2FKWmlYbDJtUDdWRTVxUkJRTXRCdnl0c3NxY2dWcW5VQU5hRGRU?= =?utf-8?B?Zi9aYVltVW5NSTdhdkhtcDdWYWtFQWtZeWwydUR2SmhDRTRGR0NsM0xYVith?= =?utf-8?B?Rm9CN1ludms4dnRoNDB4WVBpdzBnV0ZUbk43Zmp3U01KUjdYdC84YzU0YkNC?= =?utf-8?B?MGlMdHpLOENjaEZlYS9YUS9ZTEJRR3M4dktRODFxZko0QUp6dG15cDMySFgr?= =?utf-8?B?UEVSeDJWb0FPd2taenljYVZIUjZCSmQvbXJJRGUvM1dTNk5WQUdDSWFMZHc5?= =?utf-8?B?MmF3bHJybXB0eGc3WUdIT0VURjhrUmkxVldBcHhhNkJTNDM0amNGY0laMTFC?= =?utf-8?B?N0tEcGJQWTJ1V01TbWJHUU0ycmVKRVArRmM2MUhsckdoUW03V1prRkJaRFJv?= =?utf-8?B?YzcvdlRob0FPOXRhcFJRaGRWakNMVDNJRERaRDdnVWtqZzNPTDRtQjgzaEhm?= =?utf-8?B?bVNtOVJpWWRDZm9iTFpuWmhkdTdHdDR2VWZpeENxdkY2WlgvaENreEFsMWJB?= =?utf-8?B?T1hodW5kVUZ2Umo2TkZJQm9kSlk5NFIwMER5RzVCRkMxQ3BjMDZscXhQcXQz?= =?utf-8?B?K0s2VWlPOVgxU21DQzlQOU91UWVaUjUxbE4vZGNIa0pwa0REUGNFMXFoRE1v?= =?utf-8?B?bm5rTFdzYVA1WUpFckpqck9EQS94Q2RqMjlVUWcxYVpVd1JmdDJhYVpRdi9l?= =?utf-8?B?ZXFWR2h4aVhjKzZEQWtta3VOTThaaTdQbjJLbE1YOFd2eXdUMUtPWHlGa280?= =?utf-8?B?TWtKR0sydlNmdUZHTi94aUkwbElqUmZRV1pBSGU3VFVYQW1PSnRPNFBxQllN?= =?utf-8?B?ODlDYVMrQURrV1ByeUhQZHMxOHE2di8xZExyWFZVaWRoLzhIUVdGcm43QVdn?= =?utf-8?B?SmlOVlNtVk1YY1dFVVBIRHdVUTdPREJHRHZXMm4xV1pSSEljS25pWUhiQ1dV?= =?utf-8?B?ajVSQ3hJOE5uYWY5dEtSTUNqamtWY3hZWFIrUjdiL0o2UTRMeHhWQnVQNmRs?= =?utf-8?B?Ti9XUktsQ1ZTRHcvb20xb0syLzNPQVEvQmxuQW8zbmpITlNGaDRTdjdyNjhW?= =?utf-8?B?eUtiQkVMT2Y5SFgyZXFNRlJpU3o0TE01ZUpOUm5tdStIaXBpUUVibngyMDFk?= =?utf-8?B?bHRuUmpPbjdIdlBvZ2VDckExWm1oL0VCajNyOGlacThPMmc2VHFYdXphZk5p?= =?utf-8?B?cmJtZzI2eG9LWUpGMHpaRW9LajI3Wk1NOXYyV2FFbUdYSUVJcDdabExJL3BP?= =?utf-8?B?QUQzS3JmdnNIVDlWRW9LZ1R1ckZNUk82c0VSdFJQV0J5ZGhjQ2RCV3plVU44?= =?utf-8?B?MTZacWpnQXZVNUNGSmUxKzBBcG9EeWJKVGNkeHdvRXVGcWJpWlJYZTBTdkxu?= =?utf-8?B?dldWZ2hWejlLcU9ONHI3aUNudGtYSnJJd1pmUDMwaUVDTW5Sc2w2WXVCYmhZ?= =?utf-8?B?UThIelJwQXhRQWttazc2d3phOFFLZUxSWCs2ekZHMjZPUUhlaUZOL0JxTzRP?= =?utf-8?B?S1B2WFJwRVJXSDF6VktWM1lTazNncEYxYXJBcWV4c3pZS1JnazhydW4xTm9j?= =?utf-8?B?QWxzZmYvQWN0Q1dkNk5ta2RiODB5cXhnZEpuL1hUVEJKZXpyN28zcndhODRn?= =?utf-8?B?QTVZUVF1d2JrR1JOaWdyY2NSNTh2K3ZyS3ZtSzhXUFNud3ZaZWIydWMvN1Fz?= =?utf-8?B?TDdYdERDelVSbWxGV2VLdERselRrRVNidDM5WXpsZWd6OFJJc1NwYzBvS2RY?= =?utf-8?B?TWpWdGduNlc4RlZzSU9jcE53SVAvV3lVd3FvS1htZFc5NVg0TjhDTUhudlZD?= =?utf-8?B?VjVkcGFscGkxMTFIekdVZzFVVk5McytObGo0cWZBZXdrUGx2YVNKOXlmMTR6?= =?utf-8?B?THREemtFUmg2K1dFUG5hOUdnQUV0WDE1Y2U3bkQ3TlVzRU9HUGNWYTlqdkZy?= =?utf-8?B?bFQ5bTlGUjBLSXZ5c1RtR2pWVVhVTVJ4TkU3WW5UK0piaXdkTWhTZTdjQng4?= =?utf-8?B?K1B1Tm1IM1I4RmJRdmtWSW1lU0RZYVhZeU9xbXJXbmoxenE3NEw4TTZvRys2?= =?utf-8?B?MFl4NW5PR0o0UER0clB0NWJTdXdQMCtrcndEemdXMWx0NmFBNUF5U21sNjhn?= =?utf-8?Q?OPqMUO0wcgCQ6qvETuycxpOzV?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 909442f7-b5c9-4551-e066-08dda3080c46 X-MS-Exchange-CrossTenant-AuthSource: CH3PR12MB9194.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Jun 2025 01:35:12.1326 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: WuAGe162Z5PI3Pkufhz7svmUwWWmLL+vYVnH962qNEl/oAvBgvLX4HCKqTxv4GJ4QAF9FXGYB+M2jSd8PRA1Ww== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR12MB6103 On 4/6/25 08:47, Dan Williams wrote: > Suzuki K Poulose wrote: > [..] >>> Ok, something like this? and iommufd will call tsm_bind()? >> >> Remember that there may be other devices, AMBA CHI based devices >> being assigned. Not sure if they pretend to be PCI or not. > > I have been thinking about this especially with the relative ease of > creating samples/devsec/ given the existing Linux infrastructure > emulating PCI host bridges. > > Why not require PCI emulation for non-PCI devices? The tipping point is > whether the relative maintenance burden of not needing to maintain > multi-bus Device Security infrastructure outweighs the complexity of > impedance matching those other buses to PCI. > > Make "PCI" the lingua franca of Device Security. This is how virtio started, and now it has to behave like a proper PCI device, i.e. use DMA API. Or ivshmem which maps memory as "PCI" (which it is not PCI but the guest does not know it) and is deprecated now. Not the best idea to enforce PCI from day1 imho. -- Alexey