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    SubjectRe: [PATCH -v2 1/2] x86: Reserve [0xa0000, 0x100000] in e820 map
    On 04/13/2010 02:42 PM, Yinghai wrote:
    > On 04/13/2010 02:18 PM, H. Peter Anvin wrote:
    >> On 04/13/2010 02:11 PM, Yinghai wrote:
    >>>>
    >>>> I guess the real question (which I haven't looked at myself) is if the
    >>>> E820_RESERVED -> BUSY will cause an explicitly assigned BAR from being
    >>>> moved. That's bad, not so much for this particular range, but from BARs
    >>>> which may be assigned by SMM. Hacking that up in a simulator
    >>>> (Qemu/Bochs) and testing it is probably on the to do list...
    >>>
    >>> no, if some device BAR fall in that range, it should still use that range, and will not be relocated.
    >>>
    >>> will update the change log.
    >>>
    >>
    >> Good, that's what we want.
    >
    > the driver for that device later can not use pci_request_region(). because that region is BUSY already.
    >

    That's not good (in general - for devices in this particular range it's
    not such a big deal, but it is potentially really bad for devices marked
    reserved for them not to be moved.)

    We have talked about a need to resolve this before.

    -hpa



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