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SubjectRe: [PATCH 0/3] iommu/vt-d bad RMRR workarounds
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On 12/13/19 10:31 PM, Barret Rhoden wrote:
> On 12/11/19 9:43 PM, Lu Baolu wrote:
>> The VT-d spec defines the BIOS considerations about RMRR in section 8.4:
>>
>> "
>> BIOS must report the RMRR reported memory addresses as reserved (or as
>> EFI runtime) in the system memory map returned through methods such as
>> INT15, EFI GetMemoryMap etc.
>> "
>>
>> So we should treat it as firmware bug if the RMRR range is not mapped as
>> RESERVED in the system memory map table.
>>
>> As for how should the driver handle this case, ignoring buggy RMRR with
>> a warning message might be a possible choice.
>
> Agreed, firmware should not be doing this.  My first patch just skips
> those entries, instead of aborting DMAR processing, and keeps the warning.
>

Hi Yian,

Does this work for you?

Best regards,
baolu


> So long as the machine still boots in a safe manner, I'm reasonably happy.
>
> Thanks,
>
> Barret
>
>

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