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Wed, 6 Jan 2021 15:23:41 +0000 Date: Wed, 6 Jan 2021 11:23:39 -0400 From: Jason Gunthorpe To: Leon Romanovsky CC: Lu Baolu , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [RFC PATCH v2 1/1] platform-msi: Add platform check for subdevice irq domain Message-ID: <20210106152339.GA552508@nvidia.com> References: <20210106022749.2769057-1-baolu.lu@linux.intel.com> <20210106060613.GU31158@unreal> <3d2620f9-bbd4-3dd0-8e29-0cfe492a109f@linux.intel.com> <20210106104017.GV31158@unreal> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20210106104017.GV31158@unreal> X-ClientProxiedBy: YTBPR01CA0003.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:14::16) To DM6PR12MB3834.namprd12.prod.outlook.com (2603:10b6:5:14a::12) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from mlx.ziepe.ca (206.223.160.26) by YTBPR01CA0003.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:14::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3742.6 via Frontend Transport; Wed, 6 Jan 2021 15:23:41 +0000 Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1kxAex-0031qq-RW; Wed, 06 Jan 2021 11:23:39 -0400 X-LD-Processed: 43083d15-7273-40c1-b7db-39efd9ccc17a,ExtAddr DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1609946630; bh=chutKAOueKzJ42yHzRW86r8VwbDXBIwctf9qcU4AwVI=; h=ARC-Seal:ARC-Message-Signature:ARC-Authentication-Results:Date: From:To:CC:Subject:Message-ID:References:Content-Type: Content-Disposition:In-Reply-To:X-ClientProxiedBy:MIME-Version: X-MS-Exchange-MessageSentRepresentingType:X-LD-Processed; b=ekxcvTjtpm+oIk7R79mxZfS1daYa4M/bArofO6AFUxp7RVXywivBSuDah1hEIXKF7 bm6zOaM2vaQtduMT4OgfdmLmVAD3FWQOiEO9yEVaVQxghDJT1IjTjOr0uSE9lq5I/w X8WcuQU4PYO6y97OEYFiVNX1+MYSROG0U3Ew6H7zeOFSRLoBVWterStyjKowZXkVUG ACTOAM7nMEN90RlZZp7TnrVMXrvMkoIPRiuVYYOgzJifUP0HeJcJrPiLqyg+MiSqKd JnL53LckrctGi6Jpib9X+0WBMdNjOURleR/jOpReeuiolmT5i5NTPNVR+d43xOwYYb nZ9SE+Omw2/YQ== Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Wed, Jan 06, 2021 at 12:40:17PM +0200, Leon Romanovsky wrote: > I asked what will you do when QEMU will gain needed functionality? > Will you remove QEMU from this list? If yes, how such "new" kernel will > work on old QEMU versions? The needed functionality is some VMM hypercall, so presumably new kernels that support calling this hypercall will be able to discover if the VMM hypercall exists and if so superceed this entire check. Jason