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Message-ID: <9e493e2e-8cca-2b7e-e6b5-d4413c54a866@suse.com> Date: Thu, 16 Mar 2023 09:51:20 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.8.0 Subject: Re: [RFC XEN PATCH 4/6] x86/pvh: PVH dom0 also need PHYSDEVOP_setup_gsi call Content-Language: en-US To: Stefano Stabellini Cc: Huang Rui , Alex Deucher , =?UTF-8?Q?Christian_K=c3=b6nig?= , Stewart Hildebrand , Xenia Ragiadakou , Honglei Huang , Julia Zhang , Chen Jiqian , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= , Anthony PERARD , xen-devel@lists.xenproject.org, Andrew Cooper References: <20230312075455.450187-1-ray.huang@amd.com> <20230312075455.450187-5-ray.huang@amd.com> <521ccacd-a45a-f55a-72ed-de6b64bca050@citrix.com> From: Jan Beulich In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: FR3P281CA0108.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:a3::11) To VE1PR04MB6560.eurprd04.prod.outlook.com (2603:10a6:803:122::25) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: VE1PR04MB6560:EE_|DBAPR04MB7416:EE_ X-MS-Office365-Filtering-Correlation-Id: b35d3a52-73da-482a-8246-08db25fb9ec4 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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First of all you need to address the Why? >>> As already hinted at in the reply to the earlier patch, it looks like you're >>> breaking the intended IRQ model for PVH. >> >> I think this is rather unfair. >> >> Until you can point to the document which describes how IRQs are >> intended to work in PVH, I'd say this series is pretty damn good attempt >> to make something that functions, in the absence of any guidance. > > And to make things more confusing those calls are not needed for PVH > itself, those calls are needed so that we can run QEMU to support > regular HVM guests on PVH Dom0 (I'll let Ray confirm.) Ah, but that wasn't said anywhere, was it? In which case ... > So technically, this is not breaking the PVH IRQ model. ... I of course agree here. But then I guess we may want to reject attempts for a domain to do any of this to itself. Jan