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Re: Assertion '!is_idle_vcpu(v)' failed after 'Remove fully_eager_fpu' commit on EFI
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 16 Jun 2026 08:16:41 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>, "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 16 Jun 2026 06:17:12 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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.
Jan
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