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To: Oleksandr Andrushchenko , Bertrand Marquis Cc: Rahul Singh , "xen-devel@lists.xenproject.org" , Andre Przywara , Ian Jackson , Wei Liu , Juergen Gross , Stefano Stabellini , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= References: <77CF7FA5-C566-469E-B4A8-0400789890BB@arm.com> <53AE6E2A-01D7-41EC-9B2C-C0D596EB8D4D@arm.com> <0744b957-1832-dff2-9ae2-b8e8534f501b@suse.com> From: Jan Beulich Message-ID: <09656882-b297-7144-c291-1ee997edb119@suse.com> Date: Tue, 12 Oct 2021 12:20:34 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: AS9PR06CA0322.eurprd06.prod.outlook.com (2603:10a6:20b:45b::6) To VI1PR04MB5600.eurprd04.prod.outlook.com (2603:10a6:803:e7::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 742714b5-421c-45ed-f217-08d98d69eed6 X-MS-TrafficTypeDiagnostic: VE1PR04MB6670: X-LD-Processed: f7a17af6-1c5c-4a36-aa8b-f5be247aa4ba,ExtFwd X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8273; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?N3ZmYklqNm9YbktvRGJ5OTJWVXVhd0l1VUgzVW5HeHhtZEl5Tm9QWHZIcFU3?= =?utf-8?B?dG1rVzlpTlFwc2hCK0NNZUk3YVJaRThNcEFvWEZNZFd2dEZ2K2h5QW9USDV2?= =?utf-8?B?dmhCZnBJNHhwOHJrY3g3ZEVETW8xdzlRQ1pDTnpaNEFMRkFzUW1pcEFHTDBs?= =?utf-8?B?cW9JU1JzT1AxV0loNTI5R2d1QWc5R1BESUdOZ1NlTkxmZExKNW9CaitjOTQ5?= =?utf-8?B?QktiTERwNUk5bnZ4N1VmRE5TbmZ3QUpEZGt5cGR4MUlnQXB2djNZVzlacU1p?= =?utf-8?B?cVF5OFN5RXVoc1phZFVpSVdubEVmTy9DUHJUaDZ4UXJhTjE3aCsxcGFraE0y?= =?utf-8?B?bTVWNXFVQzF0cmZqOUZRazNRdXNNTWk4eFNGVjJMekFmOW9td0hXSWFGOGV0?= =?utf-8?B?SEkxaWJ0TmVMMlEwTHdxN09iV2NiTkxEODdKOTE2cmgzK0xaTXgwUkNpWmVa?= =?utf-8?B?QmVsMFkrMFhkM2VVK3lOZ1N0SldLYlVORk1GYVUzbDRqdzNlMVlyUWVLKzJn?= =?utf-8?B?OWxVdkZNUXdTVlUyaVROM1kxR01pckQ3bTg5VjQxckNjOGVUYTdZcHNxdlpI?= =?utf-8?B?eTB1eWIwMXdkQVE3U2RrVC9HZGcvUi9vWE5idjRBZG9Jd2xZa0FyeUgrUXNZ?= =?utf-8?B?NCs2bXR1Z2loaXFJTmNiNGczR0RaS2wwZFpJbnVXdTJrZGl4SFRVVUUvQ3dw?= =?utf-8?B?VWMyQmd4NkhsVlFCd0lNUUtwZmYyTmpMVWxwK0NCZ2VmSGlsRE5IV1Y0TWc3?= =?utf-8?B?QUMxSmxaYmwyRDZJUXlBZGlpM3NGdkxjc2ErSi9US2dyMkhwNVNoaDZFclBq?= =?utf-8?B?SWdOa3JOZ2FzM05UQ3VpVHRwclcxRUl1d0N6cFUyOUx4bnk4QUxmWGV6S0tG?= =?utf-8?B?Y0FEWFhyeDhKd21yRUgxNHVmWkY3T2Z1R0tqRFl2MkVlN2VieXRKQTRFeGpk?= =?utf-8?B?clBZaGFVZHZXaHdmc29aQmNuRnBsVURyRVJqdGNYT2xUMVN5eFIrcEM0LzVW?= =?utf-8?B?QnZCUlVEUTRFN0NCNmRsWGUyaDdHNGQ4YzllZnJ3WVBZTkxQRFdjL2pDTlJG?= =?utf-8?B?QWcyU3JZa2ZPcFU5d2s4c1JnUzFrNEc0MmxGZTgrcXR1SGFuMlpwT3oyZS9M?= =?utf-8?B?MkFjelhxaVlOdXZ2Sms5VUdVelljU3FuU0xsUWtuZ2xseFNqR0diQnhkZWpD?= =?utf-8?B?dDJCeDBwWTQ0MWlodzJLMmM2MitvbUZsb3VRQ3Q0aU5BYTRVM1Y4ZmFnWjZM?= =?utf-8?B?NWJYSW1EYmRJS0RvWW1lSW5CSmhudm1maFZMaFJDRTNMd0pWZkdyRE04Lzd4?= =?utf-8?B?MUJqYm95MDBha0VHOGI3VVd6VmFnRlZFeGNXSHJQaTBpRzM3ZkYwUTAxVEkr?= =?utf-8?B?ckRRalZBL2FINkhGMTMxVm5aTFc1bkRKRm1CVDErK2hzU2NHQjg5ZmlVK1lh?= =?utf-8?B?RmRGU2Yzc1lzV3duZHBkR0o1ajFpOFdBZGQrUzcxZW95VVFEa2NYQ0pucjQv?= =?utf-8?B?ckFVeWJGVnh1Y0dWMSthZnM2NHdSd2NyeENXZTg2LzkyTUxLSForWFZXZUto?= =?utf-8?B?cmRSY2QwQ1hlTFlVdFYrN2JZdmRPM0lxSGt2Y3ppM1RhYUhrd25tZVFWNDVy?= =?utf-8?B?QU1XZ3JQOHRHa050dG5EbDRPTDdyajJIaXF1a0ZTL0U5ejBrT3paK3BLNS93?= =?utf-8?B?OUFGSG96Umo1VDk3azVlL1FlV1NhUjJpZkJ6eDlBdGYvRUNESVMwUnIyMkxt?= =?utf-8?Q?KwSDiLeyMIPl8wESTMHjJDCiBoY+rl0Ny80B7fo?= X-OriginatorOrg: suse.com X-MS-Exchange-CrossTenant-Network-Message-Id: 742714b5-421c-45ed-f217-08d98d69eed6 X-MS-Exchange-CrossTenant-AuthSource: VI1PR04MB5600.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Oct 2021 10:20:37.1010 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: f7a17af6-1c5c-4a36-aa8b-f5be247aa4ba X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 8d3ZAI3DRk1lTLUradsr1nv7Cm9IihsUSMI/hEpIj4MLVzGSqwlEfx3eovD9DSmQW+YoHlMFtwV5djyAvXvvdw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VE1PR04MB6670 On 12.10.2021 12:06, Oleksandr Andrushchenko wrote: > On 12.10.21 13:01, Jan Beulich wrote: >> On 12.10.2021 11:38, Oleksandr Andrushchenko wrote: >>> On 12.10.21 12:32, Jan Beulich wrote: >>>> The minimal thing I'd suggest (or maybe you're doing this already) >>>> would be to expose such BARs to the guest as r/o zero, rather than >>>> letting their port nature "shine through". >>> If we have the same, but baremetal then which entity disallows >>> those BARs to shine? >> I'm sorry, but I don't understand what you're trying to say. >> >>> I mean that if guest wants to crash... why >>> should we stop it and try emulating something special for it? >> This isn't about a guest "wanting to crash", but a driver potentially >> getting mislead into thinking that it can driver a device a certain >> way. > Well, for the guest, as we do not advertise IO in the emulated host > bridge, the driver won't be able to allocate any IO at all. Thus, even > if we have a BAR with PCI_BASE_ADDRESS_SPACE_IO bit set, the > driver won't get anything. So, I think this is equivalent to a baremetal > use-case where we have no IO supported by the host bridge and > a device with IO BAR. Oh, now I follow. Fair enough. Jan