Re: [RFC PATCH] PCI MMCONFIG: add validation against ACPI motherboard resources

Jeff Garzik
2007-05-23T21:42:31Z

Jesse Barnes wrote:
> On Wednesday, May 23, 2007 2:35 pm Alan Cox wrote:
>>> One of the reasons why hardware vendors want to move away from
>>> traditional accesses is to be able to use the larger config space
>>> in PCI-Express, rather than being locked into the 256-byte legacy
>>> PCI config space.
>> Mostly for treacherous computing extensions where subsets of the
>> config space can only be accessed by signed machines blessed by your
>> favourite movie company and video card vendor...
>
> I hate "trusted" platform garbage as much as the next guy
> (where "trusted" means the actual user can't trust it, just the
> seller), but I think there are legitimate uses of extended space as
> well, PCIe AER uses it iirc, so don't dismiss it on those grounds. :)

Indeed. It's just a register space. Assuming one register space is
"more evil" than another, simply because it is bigger, is.. well.. silly.

Jeff