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Smith" , Marek =?utf-8?Q?Marczykowski-G=C3=B3recki?= Subject: Re: Assertion '!is_idle_vcpu(v)' failed after 'Remove fully_eager_fpu' commit on EFI Message-ID: References: <1781272430.8631fc262581453bbf619ec5b2062170.19ebc1c488b000701b@vates.tech> <0db98119-48f3-4edd-a422-8e50ee713b7c@citrix.com> <48878ff6-ad36-448f-aa9d-6b37e2e179b1@citrix.com> <1781277924.8631fc262581453bbf619ec5b2062170.19ebc701bfb000701b@vates.tech> Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1781277924.8631fc262581453bbf619ec5b2062170.19ebc701bfb000701b@vates.tech> X-ClientProxiedBy: MR1P264CA0089.FRAP264.PROD.OUTLOOK.COM (2603:10a6:501:3f::22) To CH7PR03MB7860.namprd03.prod.outlook.com (2603:10b6:610:24e::14) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH7PR03MB7860:EE_|BY5PR03MB5187:EE_ X-MS-Office365-Filtering-Correlation-Id: 2430c4eb-8777-4736-d16f-08decabcc820 X-MS-Exchange-SenderADCheck: 1 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=?utf-8?B?NHdUbUQwVWVFMkk4Qmp6OHdETksyV09qUVdmK1ZuVkUxR2RldTNXczU5N0xM?= =?utf-8?B?YmdaQ3ptQTNoZHJTa2ZKMmJ1amw4NjhrQ0JGNnBINnZiaXU4dU8rT0JPWTIw?= =?utf-8?B?TkhRMkVkVHllMDhyQU1qSlB2TGp5aE9qVmFtcjZpSkZvZnAwVmUxNThOdTI2?= =?utf-8?B?Njg4Mk9yZXAyY1R1UHpLMjRpMTRvS0tjMXhPWmVOQWRKclFKbEREN0dGMnMv?= =?utf-8?B?cW1wQW9FelR4L3FGWU1PZEtTYXhtZjhIREhld0JwYkRsS1ZrVTlUQT09?= X-OriginatorOrg: citrix.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2430c4eb-8777-4736-d16f-08decabcc820 X-MS-Exchange-CrossTenant-AuthSource: CH7PR03MB7860.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Jun 2026 09:02:09.6015 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 335836de-42ef-43a2-b145-348c2ee9ca5b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: kpST1H4uIETxXefj8IMcI7tBZIgfeyN1RbyVkC6E9jtalRxlSFRJ66owrjkgkBWymjUChXyIZLn8L3fthv3r0A== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR03MB5187 X-purgate-ID: tlsNG-16d1c6/1781514133-8757ED75-69C39FD9/0/0 X-purgate-type: clean X-purgate-size: 1862 On Fri, Jun 12, 2026 at 05:17:31PM +0200, Anthony PERARD wrote: > On Fri, Jun 12, 2026 at 03:32:00PM +0100, Andrew Cooper wrote: > > On 12/06/2026 3:20 pm, Jan Beulich wrote: > > > On 12.06.2026 16:18, Andrew Cooper wrote: > > >> Well, no intended change.  It was a very big patch. > > >> > > >> Nothing should ever be using efi_get_time().  It's unusable (i.e. > > >> crashing) on hundreds of millions of machines. > > >> > > >> So, while we obviously do need to fix the assertion, this is "only" > > >> collateral damage from having fallen into the efi_get_time() path in the > > >> first place.  That wants investigating too. > > > Perhaps a reduced-hardware system with ACPI_FADT_NO_CMOS_RTC set? > > > > The identified system is a Broadwell-D. > > > > Come to think of it, there were some systems of that era which (falsely) > > claimed to have no CMOS.  (An HP Haswell Blade comes to mind, but it > > will be a similar chipset.) > > Some info from the boot log about the machine: > HPE ProLiant m510 Server Cartridge > BIOS Version: H05 v1.98 (02/02/2023) > System Memory: 32 GB > 1 Processor(s) detected, 8 total cores enabled, Hyperthreading is enabled > Proc 1: Intel(R) Xeon(R) CPU D-1548 @ 2.00GHz > HPE Power Profile Mode: Custom > Power Regulator Mode: Dynamic Power Savings > Advanced Memory Protection Mode: Advanced ECC Support > Boot Mode: UEFI > HPE SmartMemory authenticated in all populated DIMM slots. > > One of the cartridge on a Moonshot. > > > > On such systems efi_get_time() would better work properly. > > I guess it works fine on this system. On a different cartridge, with a > Xen build prior to the commit, I have in the boot logs: > > Wallclock source: EFI Can you provide the decoded dump of the ACPI FADT table? Thanks, Roger.