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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?cmNjTmkwa1ZidTJZK3l3MUtoT0xHMlFhWitRRCs0c1F1eFJnR0h4WUxVNWR2?= =?utf-8?B?eXNYL3lCUE9uSklUdFJXV1RrZ09lQzRjRFRGd0VNK3UwNlBtNklZTlVoazRk?= =?utf-8?B?QkFrb1NtUVZ1VEVESlV1RnVjbTV2V202Z29KcXRTbTZNV0Y4bGxBT1pkQURz?= =?utf-8?B?ZW9wc2RNLy95aEN5VVZ3czRsQ0ZSYkFoOGZtZzZOSi8zOHdVWnZBRHV1aG03?= =?utf-8?B?RDZQZmhubmZXZ3owMmJmQUdlcXhFZDMyY3lRM2NtM2NmaXBkSDdPcmVmZHlD?= =?utf-8?B?djJDZjBHQ1JxQVZEV202Y1hqUnFtVzE4VVczc2ZZeGF6MDEwZXluUTBiMHVw?= =?utf-8?B?M3hTY05tSWxhVmYrY0ZQUUxQOVRmSVVIVmEvRDdsT2wrMldGcVhJeWQ1eXRu?= =?utf-8?B?SEpBN2Zzb3BWQnRYRnYwSVBmdUxIWjMvcVM3WXo0elUzRG51d0kyekxzZElX?= =?utf-8?B?OWF2R0F6c29NOUNwbnZRUTdmYm45cjUxWERjY0NiV3cxRlFxU1Z2K3hEUVM0?= =?utf-8?B?SHYxOWpLQmFTeW9JSEhtUE9OblNnV1lmTHRhVm9QSHFlK0h4OGpkblh6aUVw?= =?utf-8?B?ZFF1NnU0cXFydmxyWWV5b3BjQVhjaUtKNnNkMjlkbklSeEg3cXJOZU1wVmwr?= =?utf-8?B?WnFCcGlFVlJLdGV0UkpZSlhjWGI0emRyUU13cm1EVHVuTjRZVXk4MEg3M2Y4?= =?utf-8?B?QVJlUm42QmlSMVg1L0RZK1VYNG5ya3dRN1VDSm9QQ0ZsY2tnZlFOK21CR2ts?= =?utf-8?B?dUpNUnV6WnBTYldEQjl6cHFHZUhhSDNsVzJhT3NkTFl6RDRaZnBGZE9MUk1O?= =?utf-8?B?ekNtZlp3WnRTaTB4QnpFOTFjMlJncG1WUE41VURDZHpGOWJPMnAzcXVXcWVF?= =?utf-8?B?QURxR1l4NEk5aVMwK2YvT0FaVkJ0amxFbFM3OVFFUHQxM3BwVFZSM0hXaS9K?= =?utf-8?B?M3lKTGt0S1NFdFU0R002aDhTRGtYWmJTSW8ybWx2S3lSNmpCaUdDVlArWTNx?= =?utf-8?B?MGlYYWJ3bXBMcHZVZFYrVlg5dVdTQUJzRndkOVVEbkNiSXpkV1ByN3kwcXZl?= =?utf-8?B?NVBDQU1EZ0pxblFMK0o3UHVwUUlNYjdpeG1VTW5NZFJGZVE2aVcyMWJFMXBo?= =?utf-8?B?L1dmSUpuZXFiaExzdTNNRE52TXhhLzJ4WDhTeENyVTY3Vys5U3JsNE05ai9a?= =?utf-8?B?L3M0NTZoWlNJQVlETmtwWll2SGtPeVhuYTlIZ2lhWXJ1KzYwb0U3OGVEQXpS?= =?utf-8?B?clQyZ2NSOE4valh1RnpFRjEvQldjenF4bEZQTk5TL003SHBtRGFXVFp2SmlE?= =?utf-8?B?enBOTnlPRUxlNGMrMTJuUStVcG12Z3k1VzFGQkE5VlJVK2UxRFBHK05BNFZY?= =?utf-8?B?NndUcWZqa0YxTmUycnp4VzdLS3RNUVk3M2d2VUtPVjRwaWpxMFI4UENYTzN5?= =?utf-8?B?R0NlS2tSOXlFcmxxRkszMTVUcUsrOVZwUXVFOHhWWFhQaHliU25CRTEwLy90?= =?utf-8?B?ZU5Cbm1sZURtRGlzVitnczZkekN2M3JjNHVXOUoxVVRjaWN2M1BsQnc0R2lz?= =?utf-8?B?WWZOdzJiL2UySDY1UEUycWdNZmkzaHVueHhRYktFOWJwd0JjUzQvRFljWHZ1?= =?utf-8?B?ZThvalkxajVVcVVNaTlnYTBwTll0UmxvQXZtVFNPWVUvV1RSTEs1aXA0V2V2?= =?utf-8?B?elhhZ2RmRUNJeEs2anFVNVV0NitBazA3WE8xTFJJdnB2aDBLRHpYazVMMHBX?= =?utf-8?Q?wkI5T/e4cgVdQ+deb2d9t+lxO9wWgQhM4GvJsC/?= X-OriginatorOrg: suse.com X-MS-Exchange-CrossTenant-Network-Message-Id: e5dd8198-443a-4a11-cc3b-08d9780ec4a0 X-MS-Exchange-CrossTenant-AuthSource: VI1PR04MB5600.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Sep 2021 06:05:07.5142 (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: /XmOHC6lN2IUqjf47JGNLw8p8/lTwSbsG5MwpjVXq6AP5RbHJxGNyHUL2/kB5KXtEqcaDiCrdMyus/cBtfFUWA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR04MB4445 On 15.09.2021 04:40, Elliott Mitchell wrote: > On Tue, Sep 07, 2021 at 05:57:10PM +0200, Jan Beulich wrote: >> On 07.09.2021 17:03, Elliott Mitchell wrote: >>> Could be this system is in an >>> intergenerational hole, and some spot in the PVH/HVM code makes an >>> assumption of the presence of NPT guarantees presence of an operational >>> IOMMU. Otherwise if there was some copy and paste while writing IOMMU >>> code, some portion of the IOMMU code might be checking for presence of >>> NPT instead of presence of IOMMU. >> >> This is all very speculative; I consider what you suspect not very likely, >> but also not entirely impossible. This is not the least because for a >> long time we've been running without shared page tables on AMD. >> >> I'm afraid without technical data and without knowing how to repro, I >> don't see a way forward here. > > Downtimes are very expensive even for lower-end servers. Plus there is > the issue the system wasn't meant for development and thus never had > appropriate setup done. > > Experimentation with a system of similar age suggested another candidate. > System has a conventional BIOS. Might some dependancies on the presence > of UEFI snuck into the NPT code? I can't think of any such, but as all of this is very nebulous I can't really rule out anything. Jan