From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from NAM11-CO1-obe.outbound.protection.outlook.com (mail-co1nam11on2068.outbound.protection.outlook.com [40.107.220.68]) (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 885461C680; Sat, 1 Jun 2024 20:40:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.220.68 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717274457; cv=fail; b=FrihUkoDFK3hD+sXe7pdmm31Q2luEWI57k13jxIAVq1sqYKj1Si2xdCuLATC47wcKIiYdZRHjYjebpBMvVe8qHiWlGiU3nIhDfZe5S390DGztSAg/IZtnk3kAPyW8eIBU8ZNysB5O9j5Kz4IfxF0w5AEbt03VO12gBbk/iJVwxo= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717274457; c=relaxed/simple; bh=QQLHFPL9uOsQe3fjyFoHRNLu0qCvjsC0WymP6PzT2xs=; h=Date:From:To:Cc:Subject:Message-ID:References:Content-Type: Content-Disposition:In-Reply-To:MIME-Version; b=alpOeq8Ealhuwg7R960RLudaAQ7dHqfGzgEctHtpk6H5cYNfpUE3K4gXm8tXNC3XNykJZb2rEFWrKpP49VKqLC9Dcbi/xnFLGXFHJCp6KUIqdNp3eWBuS+2qqwd6nhyz/6m10/p23a3S8gQ0ykNvXnkOZacE3QSlgpPSWAmLcpU= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com; spf=fail smtp.mailfrom=nvidia.com; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b=gdF87KPC; arc=fail smtp.client-ip=40.107.220.68 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) header.d=Nvidia.com header.i=@Nvidia.com header.b="gdF87KPC" ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=kJJo8uoprVsjWxWU74NtmD993ElS4Rss9gN9hsEGjUIbRAliCQlFxbiO5qwxyVM81SFbt6rDN/SSI9HxNP0qVfDvVFbQs2pHP2yNpGpFgvHFJEe6ZXJ9GJxyI5/xsoFHGA+OxpuPFd4KDTOxXf5v9jkiryVqkMN5J4XnJD6qW5PLj849tFcFShh8QivM/Fgl+W6nwWjK71rwldBFSZC0pl5ctmo5Ec4HaXG7aMOPlY+pxUWRYyfgaKDFrXKJLnncpnQpKS9SqgGLJmoDjYsNB1OUfMk9M0kzEh4PBr2X0eJ8Bqkt47xDT0zDIsCi9NMd2Kvz8YLEIv9Q4oMDU0DrsA== 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-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=QQLHFPL9uOsQe3fjyFoHRNLu0qCvjsC0WymP6PzT2xs=; b=PDBVpmETiQRQUMVVjOOlEesMGYrd+uIh9ZfBAHVLuotsgZIe54l0ZlwV8u5DbkCD6atYHEzOnl8YGYkBS49er/WSEsteX4hUvKMEHq/+umQ6Zdtad6qN121slTEMV5cCM2YztrKn9Mb6Iv2PASppovcCUHV9snMdef+s9PHAmp6bFM9GnK84a63ACcbQHCWG2I/t0UWlg8zXsZ7CO0FWYfBL6fCOmvtNzDZNEveiIF6cjYXRi8GrPPogye+hfMw+co/28xEvFp6Kbu3ME3AqK+G6oAO/gkVVXa2yXjNP6omwQcJYkyeQn0TMk70nVqzgE4+dAOXSJNmmTNr+LbiXQQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none 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=QQLHFPL9uOsQe3fjyFoHRNLu0qCvjsC0WymP6PzT2xs=; b=gdF87KPCPZsKgO0KANl9eU+lfEN3IHA9uuz3873IZ/vZAGZ2GD7DvDhEhMdyi7HgmwveiIqNkWbkp9XH0Mr7MT5RAfcq+5k1pz3PZmvAKNDWDvK1ZG9zC/s6MiPZA03t9uQzGfw0nAS4QXyv24W4cOg0b3++stqYSeNNsw8A2Ak47uMyVjODYn6GVo8O2YvsYFHvTsRiHlrIw3SXLWKtynm7LM9WYHnVkrHFTpUaIftZ9dsGHzl7TEscamI5lGYBSGvnQR5JBLR+Dk38J5lEoNq9pmh03QKlOeCmn+HXtKoErUqrr46SPT5/plxdwLtSvQQi28KegrbLjZxF01w1nw== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from DM6PR12MB3849.namprd12.prod.outlook.com (2603:10b6:5:1c7::26) by SJ2PR12MB8062.namprd12.prod.outlook.com (2603:10b6:a03:4c8::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7633.21; Sat, 1 Jun 2024 20:40:53 +0000 Received: from DM6PR12MB3849.namprd12.prod.outlook.com ([fe80::c296:774b:a5fc:965e]) by DM6PR12MB3849.namprd12.prod.outlook.com ([fe80::c296:774b:a5fc:965e%4]) with mapi id 15.20.7633.021; Sat, 1 Jun 2024 20:40:51 +0000 Date: Sat, 1 Jun 2024 17:40:43 -0300 From: Jason Gunthorpe To: Steven Price Cc: Itaru Kitayama , kvm@vger.kernel.org, kvmarm@lists.linux.dev, Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni Subject: Re: [v2] Support for Arm CCA VMs on Linux Message-ID: References: <20240412084056.1733704-1-steven.price@arm.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: BYAPR07CA0096.namprd07.prod.outlook.com (2603:10b6:a03:12b::37) To DM6PR12MB3849.namprd12.prod.outlook.com (2603:10b6:5:1c7::26) 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: DM6PR12MB3849:EE_|SJ2PR12MB8062:EE_ X-MS-Office365-Filtering-Correlation-Id: f28d2d23-3c83-4ae0-725b-08dc827b204d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230031|366007|376005|7416005|1800799015; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?IxIQ3V3XK9zMXHjxTiJIc0nnGXHqU/jJ5CUzqM2fJswBHD09Ii+Zg3G0IsRc?= =?us-ascii?Q?HYeJHzguGTJQnkD+kbV+NTlfymtR+58Kjo454IfnRT7zO9hzHAu8+JaMLnx6?= =?us-ascii?Q?b1wEmgl+pMkSbOjimG48BRpGDDbh19esKeip+fwsiXpLObRbO1RzhRNwk3JZ?= =?us-ascii?Q?btDnxxZVZ6hS1BVFUv/99a6z0XFrccccYMC1bi0m8V4bt4P8eoTEh+FefwnK?= =?us-ascii?Q?lh3idSbkP4HFQ93EmYywfWxutbZYmxw6FNA62/KNO+w5zOcQYFedOkt5oCcI?= =?us-ascii?Q?zNGbIyLtHW8ZWCXDn9Xg/9bUXePitPechKCdfiLs611mbaroXNNnEW//onRI?= =?us-ascii?Q?1EohrDwur+eYhX3aGnoHXXCO8eG1zq00m+TSDTWdDU61JgJv4hclB25U5i5u?= =?us-ascii?Q?dWkJx3P06a4bIZEt4ZJJgnricBJHdZVFOcNQ7xBFrUUKd1qrFsAHIbWtAf8r?= =?us-ascii?Q?46deqr2iL78RaUMo5lZDf4aRUEWF4E0y6MR7dBwnOA4ffbIh83eswuOzZyur?= =?us-ascii?Q?ZffV5kDKvAtn1h+ip1ZuRSUhOhioNHqqIfQsyxxWTcNWJ+ahNTKn4YZp2F/A?= =?us-ascii?Q?CMzOiOB6Pg5IrWC6P4qQRn7N5977/ghDjoLVPVh2ypD5L4GfY9mwRfoHlVWc?= =?us-ascii?Q?JBonlyID19TShM53JeLHjRljfSXslEVd5Pcl10hXBSPwO7mxu2BLXOBoO5B+?= =?us-ascii?Q?GfoPAZr9pOwO9MvVc2JYai+FjGM0mpFtdQr1rGRG1NJ5qTB3EovhPLhEYqdD?= =?us-ascii?Q?Lw+Oo6P6D/q0S9j77h4W506P5w3ana+5yJIo3joScQKKXnzqbGWd4jIbLVQy?= =?us-ascii?Q?sKUKNCQxLxYIKxjnQ2gF6G/ngd29AW2kNquV5Oih9KHrwKBjr+w8ujMlJwcz?= =?us-ascii?Q?dUuIcXgkMwnqOBiPhvhqpE40Xm7TR4b+7lgvgGnjOIxFMLuEB15LPAxoE3p5?= =?us-ascii?Q?2D/Fda9+n+5MCNepy9pUCB9R7ZcfPxrVYck+xEc2r1IyBxoMWHVHbS5y51t0?= =?us-ascii?Q?mMBe5BZpZLYMRX/VxcCdSQmwEoA23SRzhqhV/nUIQiwlNQwqeaM0xZ5jLC3k?= =?us-ascii?Q?KEU1rOFtzpPIzScFBU8SB1ESZZHMPGMyw7aoinhsHZ4Yqbe1N78N5CIwNQ6E?= =?us-ascii?Q?WikjWctwtPGTEGv8e6XdNwGaZvN//Gyw5UB6s4d57W9Nuu/nCafD3YKyRXsH?= =?us-ascii?Q?FAMKv7YMjUL4Cl0JSBowRlU0i/RlDaEHKryqvUXzAqiGsuIoLpDw+3fRfwIA?= =?us-ascii?Q?FU3OXYaAYAyMCsZiQ/RFXMUSsHI9MrtrQPntKP4yHA=3D=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM6PR12MB3849.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(366007)(376005)(7416005)(1800799015);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?Aq/xDarG/7y0ZrXaz4R1xYYHYFHOjpovPSJ5CMIMB0MVeCqcNo34k112aBf9?= =?us-ascii?Q?ZGeD6sQP74OHClGai8vWw1+le9GiIirRg9CrJ+VFk+A7CFw8oceVMq9yVe5C?= =?us-ascii?Q?UqYXGh6F4Z+dwpY2aUQbjR6v4B/ICUFDoIfIUNAotIFiDo4O+6M9GPOKxwiP?= =?us-ascii?Q?H6vNHs8vk/ZMT2fFtG7iM/SkVSuY/6LNbXIcpAAyy9WYLEFSw9Wqv2Qr5Fw+?= =?us-ascii?Q?oWlYaVdJguBG+JlpNGnKC9iOJNlCAWdizbpoeVqqzgRP5c9oTiwXAuL5RqEP?= =?us-ascii?Q?ANg71jbJAOjY/ZQlCu7hxu4yjOAh4rAcmuh+OUQSdjwyo1QubyJ1ibtvFT/G?= =?us-ascii?Q?cv5ZwT8+3ioMvpeUSEmhlTmZJC5OT2EHxv6aOwkf/ZtZlZyArW2VmYlMDgHu?= =?us-ascii?Q?WqU3EhjTdWtR/1vz1CMwMSnWa0i2I0rZBn1ZzGoMb2iEfaYM7VVvVu220T76?= =?us-ascii?Q?IfHQXZbrGs36yiMggiWK4ubjQivm1bQ6aFxN+X/fw9eRAPZaxNXSVFi+52LP?= =?us-ascii?Q?k6u0yyZanKwEPe6ivqCRqIoeS3jT2k4H+76GdqPcD87ReWBdnbCLWLPTdabJ?= =?us-ascii?Q?6WQI8xliPa1tQ9hXiQ9hFOFThLA/gb2Cm8q5EeF0xaVd+D8HUMhwKZwa5L/G?= =?us-ascii?Q?kWH3kMmrSpFMLPYU9w5/TOBXjaenCPhLzuJnlPY342GQsxiDjGIUI56ew8d9?= =?us-ascii?Q?0JzvpKDPfSv5qx0bBO0ciLo2PLeyZvFsM9GzXX00jlbuNJIf1Rsz0dS5+5DR?= =?us-ascii?Q?YnHKNOMg1uu7X1YByL65h2x+9bB48uwPeXTG9CEPk8npLNC73zFC6l8JbGD/?= =?us-ascii?Q?tP+4tCRdEQdCsaPcuAXAW4r2t1czfMFysMqaATZpnOEbJlHviD5ieyv+WmCm?= =?us-ascii?Q?Ji/7F4ZwxWiEIF5Ur5yqAzktj3t59/Jnb9cZiUOonn9tXfTg/4uz3mkEDxYd?= =?us-ascii?Q?STvtCncijzEm3EXMKpKK0huDjZ6VZbZhT43xUWOy1Mf7jpfmA4AbI2g/zIuL?= =?us-ascii?Q?ZTSCzdFeFJUNRMWrNf+SVcRwH5YAPB93APsb3Gh3fQTBtzx5IZv/rEzQ3vtP?= =?us-ascii?Q?BOGSvc6pRY3j5pwtWYinbrbDmfG/PF5NK6ALS2CVyRghA6aXK/kiknUUMb/Z?= =?us-ascii?Q?145wSJkLRV7Xn2QW7YIfk8MTXssLjdzWjQMLJB6MPJrAbkcruMQw7HWSoYHv?= =?us-ascii?Q?2Iyo6CfXjnJkC5Z1cHEAHAwHjrCRxFEmZ4XTydZ7v/WNlCSe7IO+MrW1oFTW?= =?us-ascii?Q?ul6hY8heY5oOr9/Lf9JSPMoZEVkkibJFhRCjHDCHYVJfV65qrDv0x+XfKQ6G?= =?us-ascii?Q?NHwnUxQmuc1o5AEasiUG9LA4mNaQP5iCUdg2cypuxM+t7WJnXrIK7pNAFeZm?= =?us-ascii?Q?BVfgkpYM7u4E7uUtAYSlC0wTM57Wi6g0qCtZwE1EzSe6eP5k3v/ZDdA9YY9Y?= =?us-ascii?Q?q35sMCFG12Q/FWW9QL+wcseA4XHY5XRVWEF/J01ace80XFoiuH2TxD38eJ20?= =?us-ascii?Q?r6HRxskrKspaOgkGmSlqnKoojASQRWqMc5/19xKCE6stRFyj4ZQ9esOZTJxg?= =?us-ascii?Q?7kNB4gsETPKmpALFQntBANi+dXIANXg8LxlPV0Pc?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: f28d2d23-3c83-4ae0-725b-08dc827b204d X-MS-Exchange-CrossTenant-AuthSource: DM6PR12MB3849.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Jun 2024 20:40:51.7226 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: thpu/S0ipIu+Ph+DVcHqdpLvY4U9U3j2ZCHow/4IXebHSJWsJ8tRQFYn2N1qbril X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8062 On Mon, Apr 15, 2024 at 09:14:47AM +0100, Steven Price wrote: > The support for running in a guest is (I believe) in a good state > and I don't expect to have to iterate much on that before merging - > but, as always, that depends on the feedback received. All the stuff I've been hearing about CC is that timely guest support is a really important thing. Right now the majority of the CC world is running on propritary hypervisors, it is the guest enablement that is something a wide group of people will be able to actually consume and use. It needs to get into mainline to be able to reach distros about a year before anyone offers an ARM CC VM to the public. Various x86 guest only parts for CC are already merged. The KVM side is absolutely really important as well, but x86 has managed for a long time now with KVM being out of tree. The KVM side is far more complex at least. So I'd split out the guest side and just send it, I saw a few comments already, but it looks like it shouldn't be an issue to make it this cycle or next? Keep sending guest enablement updates when the spec is stable and you have some way to do basic test. Jason