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Re: Assertion '!is_idle_vcpu(v)' failed after 'Remove fully_eager_fpu' commit on EFI
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Tue, 16 Jun 2026 09:07:03 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>, "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>
- Delivery-date: Tue, 16 Jun 2026 07:07:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Tue, Jun 16, 2026 at 08:16:41AM +0200, Jan Beulich wrote:
> On 15.06.2026 19:02, Andrew Cooper wrote:
> > On 15/06/2026 3:39 pm, Anthony PERARD wrote:
> >> [06Ah 0106 001h] RTC Day Alarm Index : 0D
> >> [06Bh 0107 001h] RTC Month Alarm Index : 00
> >> [06Ch 0108 001h] RTC Century Index : 32
> >> [06Dh 0109 002h] Boot Flags (decoded below) : 0033
> >> Legacy Devices Supported (V2) : 1
> >> 8042 Present on ports 60/64 (V2) : 1
> >> VGA Not Present (V4) : 0
> >> MSI Not Supported (V4) : 0
> >> PCIe ASPM Not Supported (V4) : 1
> >> CMOS RTC Not Present (V5) : 1
> >> [06Fh 0111 001h] Reserved : 00
> >> [070h 0112 004h] Flags (decoded below) : 000004A5
> >> WBINVD instruction is operational (V1) : 1
> >> WBINVD flushes all caches (V1) : 0
> >> All CPUs support C1 (V1) : 1
> >> C2 works on MP system (V1) : 0
> >> Control Method Power Button (V1) : 0
> >> Control Method Sleep Button (V1) : 1
> >> RTC wake not in fixed reg space (V1) : 0
> >> RTC can wake system from S4 (V1) : 1
> >
> > There's 3 pieces of information on here which confirm an RTC is
> > present. Setting RTC_NOT_PRESENT is clearly a bug.
> >
> > We should probably have a quirk to ignore RTC_NOT_PRESENT on this system.
>
> Imo we should go that far only if EfiGetTime() didn't work there. Afaics
> Linux also has no such quirk.
Linux also checks for the presence of a device in ACPI tables with the
ID "ACPI000E", and attaches the RTC driver to it. We can't do this
on Xen.
Thanks, Roger.
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