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Re: Assertion '!is_idle_vcpu(v)' failed after 'Remove fully_eager_fpu' commit on EFI
- To: Anthony PERARD <anthony.perard@xxxxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Mon, 15 Jun 2026 11:02:05 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>, "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 15 Jun 2026 09:02:34 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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.
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