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Date: Tue, 21 Mar 2023 21:03:31 +0800 From: Huang Rui To: Jan Beulich Cc: "Deucher, Alexander" , "Koenig, Christian" , "Hildebrand, Stewart" , Xenia Ragiadakou , "Huang, Honglei1" , "Zhang, Julia" , "Chen, Jiqian" , Roger Pau =?iso-8859-1?Q?Monn=E9?= , Stefano Stabellini , Anthony PERARD , "xen-devel@lists.xenproject.org" Subject: Re: [RFC XEN PATCH 2/6] vpci: accept BAR writes if dom0 is PVH Message-ID: References: <20230312075455.450187-1-ray.huang@amd.com> <20230312075455.450187-3-ray.huang@amd.com> <8adfeb57-1ddd-255d-6d93-24a74b463f59@suse.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: SI2P153CA0007.APCP153.PROD.OUTLOOK.COM (2603:1096:4:140::8) To DM5PR12MB2504.namprd12.prod.outlook.com (2603:10b6:4:b5::19) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM5PR12MB2504:EE_|PH0PR12MB5451:EE_ X-MS-Office365-Filtering-Correlation-Id: 78611c81-86fe-4e69-e277-08db2a0cbbb7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?Jz+K/YwArp7Ljhey2EowOkvpTELtWQgor1LpkWIPPE2BJJiWvDxpIcoheuyI?= =?us-ascii?Q?OgtF+SlJ5OdJbJE5hV1FZsOIje9xAQhBuFwcqqzz/OiFq1j2ub8Amj61ci14?= =?us-ascii?Q?1nULoYncj3rziw9vVK8/yBtCSt0elJagFMmuRZh37MD2y43LZxf413n0fhI/?= =?us-ascii?Q?A0+DSyYyUk/20077JcJ/TO6kKkkuHc3SKlWytfijBx6fK8kGLieVGtpeE9iz?= =?us-ascii?Q?qjeUQs1EsBldADf2DrUyJFa6J7YEYdIYZ9aeYA+GmZ6Lf82fh9oXT/WksA+f?= =?us-ascii?Q?ykL0q0Yp/VL1d4Mr0o9uWjdDnU+yVs95tcBx17xfVKx2ZNwFSRUTkI0p4t1+?= =?us-ascii?Q?WprTyGQUmlOUIogPGBHwAQif7jrqWuufK78IUsiWvw84EGFY6hFbwWiyPRUZ?= =?us-ascii?Q?atqTlb9Q7K4MoECqtDDae00qjkzD9p5umWZjBglD/YBA5RqaF3UOhugV1ZPe?= =?us-ascii?Q?rqgZfsGVa+a2Ls2JEC2086M1JDt1MlfU2zBv+sHkgwmTbooQTDFzDf9UI6Ix?= =?us-ascii?Q?j6MjHfMHfddSODHUgm/yRwN/k+Qd0amlQvEPR8sbMVZ49WA2SVO9eVFNCvZk?= =?us-ascii?Q?k58ixHJZoPdN3uPwxRXEK1WITkR4CIPb0q0urIFey8mmWYtkbTV7PFaHCk/b?= =?us-ascii?Q?xrEQrEBF2jG3ufxL+JZ3ztBUdm/zMVFomTnM7lRK8fhselJ2BQ1aOKvOVrB8?= =?us-ascii?Q?UmPV421qlAnihMYiLSfVcnVrLZ7JLcDGtekxTU20pT6cE9tonY8NCwbOQi8M?= =?us-ascii?Q?4sfKFUnq5ESu9H1AwzczIwvwvtfRIGvTU79NIEtO4rD6WS8YEoenEgJ+xg4c?= =?us-ascii?Q?zjFEQxAI3neZS1YmST+T1JWNcA8+SQ8DspTsYeo4Tv+tHoLrySue8Xme4e+s?= =?us-ascii?Q?XgUoZe+n5kw1Gx+qk70UKVicrAMCoDtaNAWJNySDHCPTHwJnKou33u/4zVIh?= =?us-ascii?Q?9tSLuhllxWUnV2tGoDVDn4sxraelQiOBLAEqGyfskvn/JK3/3dhl7KKQCkqy?= =?us-ascii?Q?DIT1ROAjo7bIOIWRBcseso1qsojvPpVJCyv4QcMHMbuJ9NyzjybZkCZYUg0A?= =?us-ascii?Q?ePeOGBg19Lu/MC2oH5oVvF2cwvoji69muNl05wEHc5SIPZxYg8So/gANTkJX?= =?us-ascii?Q?ovQ1lzwgs6cMhZ0hSK5nDjLJ7//601ATKYVtNqU55+WbYge/XvWgbm47Unvj?= =?us-ascii?Q?N2XifMmWs+H7C5T9yyNdtMDAnspGtVi9PHHlHlUqycUHeScZXX7VrzemV962?= =?us-ascii?Q?MQkr2zZasgDHzCLvjTTApNVn2sv4ziUYIMnKwIijiytLwjkA5h3G/0LBNuOr?= =?us-ascii?Q?y6AaPqkd+LcSwucVEykNypGKHFBF+srPV5CHhNdtw4wHMLT0b82vtZ0bDSdN?= =?us-ascii?Q?Um5xCB+rHXXb1DGWSv1NYpVPmMEtooAgp0F6qRsYCRp2jwSPr9Vt66q8jgIx?= =?us-ascii?Q?SJRbhWv9hDJqosoOzZZgtdF3er2TdGDYY/REJfr1NJggKnRIkwUa9HevM5Uj?= =?us-ascii?Q?iW60n0BmPNj30R352PbPtbN8a1iybz1VxsIrAQ+MkbJDrwVUFNZwigXB5Y+W?= =?us-ascii?Q?xH0KuTozPHTINrN3e0XkSFf47QRSxxzZ/wOz8+ft?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 78611c81-86fe-4e69-e277-08db2a0cbbb7 X-MS-Exchange-CrossTenant-AuthSource: DM5PR12MB2504.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Mar 2023 13:03:58.3234 (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: 5Hby9UtYHWHofbebKzWBrL3zHXE5/oNn/6Fe+JTCcRKO799mZuqPxrT5YfNTOkpm7bsaPa4g3CKAv4wJuDr9UA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR12MB5451 On Tue, Mar 21, 2023 at 08:27:21PM +0800, Jan Beulich wrote: > On 21.03.2023 12:49, Huang Rui wrote: > > Thanks, but we found if dom0 is PV domain, the passthrough device will > > access this function to write the real bar. > > Can you please be quite a bit more detailed about this? The specific code > paths taken (in upstream software) to result in such would of of interest. > yes, please wait for a moment. let me capture a trace dump in my side. Thanks, Ray