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    SubjectRe: [PATCH 4/8] ACPI, APEI, Resolve false conflict between ACPI NVS and APEI
    On 09/20/2011 10:09 AM, Bjorn Helgaas wrote:
    > On Mon, Sep 19, 2011 at 7:38 PM, Huang Ying <ying.huang@intel.com> wrote:
    >> Some firmware will access memory in ACPI NVS region via APEI. That
    >> is, instructions in APEI ERST/EINJ table will read/write ACPI NVS
    >> region. The original resource conflict checking in APEI code will
    >> check memory/ioport accessed by APEI via general resource management
    >> mech. But ACPI NVS region is marked as busy already, so that the
    >> false resource conflict will prevent APEI ERST/EINJ to work.
    >>
    >> To fix this, this patch excludes ACPI NVS regions when APEI components
    >> request resources. So that they will not conflict with ACPI NVS
    >> regions.
    >
    > I think this is much, much too complicated.
    >
    > Yinghai's three-line e820.c patch to leave ACPI NVS regions in the
    > iomem_resource tree, but as not busy, is far better.

    ACPI NVS should only be used by firmware or firmware interpreter instead
    of the ordinary drivers. So I think that is reasonable to make it busy
    in iomem resource tree.

    Best Regards,
    Huang Ying


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