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SubjectRe: [patch] Ignore MCFG if the mmconfig area isn't reserved in the e820 table.
Arjan van de Ven wrote:
> Konrad Rzeszutek wrote:
>
>> That is definitely a problem - and the "sanity-check" can definitly bail
>> out on those BIOSes and not crash Linux. The other side of the coin is
>> that BIOSes that do implement the MCFG/E820 correctly are penalized:
>
> I hereby contest that it's implemented correctly if it's not marked
> reserved...

PCI Firmware Specification 3.0
(http://www.pcisig.com/members/downloads/specifications/conventional/pcifw_r3.0.pdf),
page 42, notes for table 4-2, paragraph 2 says that firmware must report MCFG as
reserved region. Last sentence of same paragraph says that resources may be
optionally marked reserved by E820 or EFIGetMemoryMap, but must be always
reported as motherboard resources through ACPI (for exact citation please see
document itself, it is not freely available so I'm not going to copy-paste text
from it without written permission from pcisig...).

So it seems to me that BIOS not reporting MMCONFIG as reserved through E820 is
compliant, and what matters is that MMCONFIG must be reported as ACPI
motherboard resource.
Petr

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