From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=pass header.oldest-pass=0 smtp.remote-ip=52.101.201.52 ARC-Seal: i=2; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=pass; t=1793914702; b=ETmjBCdRjzRd0LGsXMPQlYLQKMBNmg/Y6pMhqHTWJRIva6V5otE95lumYQK1whBKd4iJ NNexu92UmniY8NGveLExukaWxsInQr6HGU+1BYaQq2HWeXjxqhWRfj+/0JUV3N9b5uGAE 9y9ZWyYcFYDkXPan2pkjZXu9oQc9xCJK4tywZfENV5CLxGr4NpvKAv5iprR+bhccBKUZ5 FSDeBAf2Z4+CELMCrdJCberv0gCkm5OOVJUqMyN0xr475KOtnlDT41uDN50Up5IjLqqeA is70qfj1XBHB2LU5z/48eTMFW7NXOx3T30sCpgvzQfHT9c1cFYh4fxDWBsKxonR00qQ== ARC-Message-Signature: i=2; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793914702; h=DMARC-Filter:DKIM-Signature:Received:Received: X-MS-Exchange-Authentication-Results:Received-SPF:Received:Received: Received:Received:Date:From:To:CC:Subject:Message-ID:References: MIME-Version:Content-Type:Content-Disposition:In-Reply-To: X-NV-OnPremToCloud:X-EOPAttributedMessage:X-MS-PublicTrafficType: X-MS-TrafficTypeDiagnostic:X-MS-Office365-Filtering-Correlation-Id: X-MS-Exchange-SenderADCheck:X-MS-Exchange-AntiSpam-Relay: X-Microsoft-Antispam:X-Microsoft-Antispam-Message-Info: X-Forefront-Antispam-Report: X-MS-Exchange-AntiSpam-MessageData-ChunkCount: X-MS-Exchange-AntiSpam-MessageData-0:X-OriginatorOrg: X-MS-Exchange-CrossTenant-OriginalArrivalTime: X-MS-Exchange-CrossTenant-Network-Message-Id: X-MS-Exchange-CrossTenant-Id: X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: X-MS-Exchange-CrossTenant-AuthSource:X-MS-Exchange-CrossTenant-AuthAs: X-MS-Exchange-CrossTenant-FromEntityHeader: X-MS-Exchange-Transport-CrossTenantHeadersStamped; bh=ffOlhY0edizRkUbuvKbot2I8Et1phstXhLA9S0EOflE=; b=2liMvvVQj2WqJwufppyCcf3d9Q7BdAgVDa79YcCRamOThgt4Y9/XnNTCHdmZiFI3USaN bAXr9K3WLJaM4cdvEIXsb2voZbpqTTSZDs5BaqWMHt5MIu7Qy8qsR43Gp1l0ey+X6sbOo Jf3bBk9MNni6nX4D0xFvcb1NfB9wMac2s7yFW2HeYnVfVmCTz+B8ZBYwED8abewhL0yZD rV5h5oNeDd8glICdE6dRppkCTA4i3Oe5CpDrYRTPaU7wvlmZAbNvVxXNiaolGwfgILgDV jEITBu/PH75P5yQ9dmSMO+O9Z0OF7RYmHMAHjGquUUs9/yrPSl2hECvYixAH9NrtshQ== ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass header.from=nvidia.com; spf=fail smtp.mailfrom=nvidia.com; dkim=pass header.d=Nvidia.com header.i=@Nvidia.com header.a=rsa-sha256 header.s=selector2 header.b=hi+59SID; arc=pass header.oldest-pass=0 smtp.remote-ip=52.101.201.52 Received: from PH7PR06CU001.outbound.protection.outlook.com (mail-westus3azon11010052.outbound.protection.outlook.com [52.101.201.52]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (secp384r1) server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D8557606A329 for ; Thu, 5 Nov 2026 21:38:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org D8557606A329 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=nvidia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=Nvidia.com header.i=@Nvidia.com header.a=rsa-sha256 header.s=selector2 header.b=hi+59SID ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=nQbDj7HLXMffh8GDuEoJdvftxmuLovJKw+IRCo0h22M2zWsJkDmEnVL7rCssKmpYdq8bcfAfxNItWNYaPZo2S9w1smKqJIQh8vx9R6cjbfvFThDOVOGOfdLAw+Y2YgKeMlJQPCPUmTDY6OrZUll/Z64dV3rg6pwWxMlicE/LCebVIWCu53KWSIxlmXLeHiu9qHODeGCmVIULm1hF3HchEAZbBIazdegC2LRe8Fsi7XL1U3HzC4CmspmFGoffArVyDvmjsL/Wd9BYdD2FK/el1owEy5a0h1AlPKRG6AN83U9qXr8OeILitLuga3ghg2I64asDKWpzbRf/L9CN+nT4Ew== 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=ffOlhY0edizRkUbuvKbot2I8Et1phstXhLA9S0EOflE=; b=Fr5NqPGiQ6C5JvibE5GHuqvC/7NeZYHN38upjk7Hl+nC+eNeyOnhX4wmFuz+XKAL+KZbQmDB+GF02Hr0MCxn/hVKJou+kyCqYhdiyxcdeeMVnM0o36myF6lEstoKPoD2RYmuRVklrHmW7qjtPusCD+6808XosDwiGRkDZ4JqaXHXqRzzCAhgLTwrWCaPNWFSwgjGU/UFCVfE8s68LOOvrJ7LxAOe7x4HgHRvmmXjFfyTGuqeXUt/pCwvTx0zVdESSAgmuWtWvJLsr83ruCT1pjLVRCgmD06SP4QcOD1bhtzuOe6njx7669bCGuLfDswYI/RaaCqeLMFtVOTl8/C7tg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 216.228.117.160) smtp.rcpttodomain=google.com smtp.mailfrom=nvidia.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=nvidia.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=ffOlhY0edizRkUbuvKbot2I8Et1phstXhLA9S0EOflE=; b=hi+59SIDmMv4wWRbo++FEeAaSx6TbVi1L4bRe4zChiyTaSbaGsGmSrq9FseO9NZP6KbxGqKrhq6+44gDyphdkXi/vmd1mr+DUFQcWisecJ9+1EizxFNs1iX5PPgPDzMS+Hfnj0q84YOD4xsyi/BQ4G0sBU6M4706ci+NTkKQX40zJdqjWUOyR18pbllCr2W3kK2d5tLkQ6JN1Dl5Vt9ukf3fve5GGzvtn2f8To3WmTQWS3iOvd5yNvLdsDXeJPDOrhXUAuvlaBxLPKhL3P9toToCObVCyfgASWwNe0hU7nEEsNflE/w+4GoCOrl9HYS3hzD3GuUQcEPYYmg+ayLAvQ== Received: from CH0PR03CA0073.namprd03.prod.outlook.com (2603:10b6:610:cc::18) by CH3PR12MB297944.namprd12.prod.outlook.com (2603:10b6:610:367::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.592.10; Thu, 5 Nov 2026 21:36:14 +0000 Received: from CH2PEPF000166BD.namprd04.prod.outlook.com (2603:10b6:610:cc:cafe::aa) by CH0PR03CA0073.outlook.office365.com (2603:10b6:610:cc::18) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.21.592.10 via Frontend Transport; Thu, 5 Nov 2026 21:36:14 +0000 X-MS-Exchange-Authentication-Results: mx.microsoft.com 1; spf=pass (sender IP is 216.228.117.160) smtp.mailfrom=nvidia.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.117.160 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.117.160; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (216.228.117.160) by CH2PEPF000166BD.mail.protection.outlook.com (10.167.252.7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.615.4 via Frontend Transport; Thu, 5 Nov 2026 21:36:14 +0000 Received: from rnnvmail202.nvidia.com (10.129.68.7) by mail.nvidia.com (10.129.200.66) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.56; Thu, 5 Nov 2026 13:35:53 -0800 Received: from rnnvmail204.nvidia.com (10.129.68.6) by rnnvmail202.nvidia.com (10.129.68.7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.56; Thu, 5 Nov 2026 13:35:52 -0800 Received: from nvidia.com (10.127.8.13) by mail.nvidia.com (10.129.68.6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.56 via Frontend Transport; Thu, 5 Nov 2026 13:35:48 -0800 Date: Thu, 5 Nov 2026 13:35:45 -0800 From: Nicolin Chen To: Mostafa Saleh CC: , , , , , , , , , , , , , , , , Subject: Re: [PATCH v9 12/25] iommu/arm-smmu-v3-kvm: Probe SMMU HW Message-ID: References: <20261015200903.2735565-1-smostafa@google.com> <20261015200903.2735565-13-smostafa@google.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20261015200903.2735565-13-smostafa@google.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PEPF000166BD:EE_|CH3PR12MB297944:EE_ X-MS-Office365-Filtering-Correlation-Id: 4da32274-ecdb-49d2-411e-08df3b84d19a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|82310400026|23010399003|376014|7416014|1800799024|10067099003|18002099003|6133799003|22082099003|11063799006|56012099006|4143699003|261028144727099003|261026140227099003|261022105027099003|261021121427099003|261021135927099003|261102123227099003|261026121527099003; X-Microsoft-Antispam-Message-Info: 6lnr4Ir1dUlZlPcKI9YKXiiRWdG1Bmr/pZm4gG4j1kybgJB9tDCD2pqqjcFKCOHz3YJipxmAV4Mhu/AmKPwacMEJG9r3MKbmECaoKb9LtGYXbCAW9fMuVEOD2aat8AtaaWm5DxaNze5rkzEVGuKnbcvqp9Pxxx2z1KysMAKdtjLgXfo3YtpY/qrArAc0sDwVxhkg2INucPmFJDUxtTr7NTOJdSsHMze4nhQchI0JcrGuqiMDfL7w5EQ0yUaNiHCG7dIDM7A1pcNwZ6RcZJqr7HZuiqvjVE8qoT/D10IeLqovZKHTwLfjwqNdIya8gVUdXU411afgfY0wTJzN/1ZS2Pmb1fh8r+4YEwjW1XjWVrIJWIvv97FGQU13m6eP9aZyXf4GklD/PKlO+bs+Ewt6Q2dN2ZTKOqziu8l93DeiotzZDC38NElzatWFLwseTwiz/KiHe4jKmdHZjk9Z79CTxEn9gPRSEvXLakJPxrZpQOf3EOb8n2T9LCXlcak8upnTohupzfw1XyHDHKJviQlwMlntOkH1ixDQYVjsaDQgqUFlN25TFvMkolbOZvc+415ZfUdWsRBmX3elgoFDX0d+2xm3Rstf2ylZ7V+xSnAvrARVouONkhDzTSwyJItmIiBCXcTaLfo4rUEjP9eJv4jD+6tO2V/PcHftxZTBupI5reepMSys5UTfQH8HakCWFe8G+5Nd3J2hsyLvkQaB4tjmhQ== X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(36860700016)(82310400026)(23010399003)(376014)(7416014)(1800799024)(10067099003)(18002099003)(6133799003)(22082099003)(11063799006)(56012099006)(4143699003)(261028144727099003)(261026140227099003)(261022105027099003)(261021121427099003)(261021135927099003)(261102123227099003)(261026121527099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: n9rDfx0oqXveyXfkdKmC4BPKMnn4Tuc52bqgE+XD90SD0Iilx4SUK/cf4opBWULhgUL7d4qV+FLcjPzwV/x4Ik6lgddaqcTf1R4Jqzmkjyp7A+vEa8bmWxuY8JO7tOcSuyXR56gW+p1CZNKzQQgnFT8lSNamGthlY62xtFAuhMkMYATzS2v6P/NeIwJt7xR1ao+/FRLMYxwTBCrVNoCeHp3KNvzJuvvIAt1RtkCSQM0OP4AKRb9yt0JyIKBbxBrVR6gG0gIqOjocwxcnXdeSLosIyAEtkROIRzTQeI3fwIlsuBzTyA6fEVQDpvaCYoemNCKm4Y5c89sbHtkbS6uyjEJ1/3o/xXKjt7zQ9rzmzdK4rwdvK4ijHlz6ToV6tnY6VytsK3ZU7qO+Asgofmgm8PPQHEmLhmKkX5bfazpuqNAHNs1zF+92RKhqgPXmAqEE X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Nov 2026 21:36:14.7129 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4da32274-ecdb-49d2-411e-08df3b84d19a X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CH2PEPF000166BD.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB297944 On Thu, Oct 15, 2026 at 08:08:43PM +0000, Mostafa Saleh wrote: > Probe the SMMU features from the IDR registers with the functions shared > with the kernel driver. SubstreamID bits and queue sizes are not needed > here: CDs are not shadowed and the command queue is set up later. > > The hypervisor requires two things the kernel driver does not: > - Coherent table walks, reported by both firmware and IDR0.COHACC, as > it does no cache maintenance on its tables. > - Nested translation, as the host keeps stage-1 and the hypervisor adds > stage-2. > > Signed-off-by: Mostafa Saleh Reviewed-by: Nicolin Chen