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Re: IOMMU faults after S3
- To: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 2 Apr 2026 10:47:53 +0200
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- Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 02 Apr 2026 08:48:00 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.04.2026 10:39, Jan Beulich wrote:
> On 02.04.2026 10:08, Marek Marczykowski-Górecki wrote:
>> The xl dmesg output (from MTL this time):
>>
>> (XEN) [ 123.477511] Entering ACPI S3 state.
>> (XEN) [18446743903.571842] _disable_pit_irq:2649: using_pit: 0,
>> cpu_has_apic: 1
>> (XEN) [18446743903.571856] _disable_pit_irq:2659:
>> cpuidle_using_deep_cstate: 1, boot_cpu_has(X86_FEATURE_XEN_ARAT): 0
>
> XEN_ARAT being off is the one odd aspect here. That'll want tracking down
> separately. As per xen-cpuid output (below) ARAT is available.
For this you may want to also add logging to intel_init_arat(): Since opt_arat
can be false only due to command line option use, it can only be the function
not being called (which looks impossible on plain staging code), or cpu_has_arat
being false despite the xen-cpuid output that you supplied earlier (inexplicable
as well, at least for now).
Jan
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