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    SubjectRe: 2.6.25-rc1 xen pvops regression
    Alan Cox wrote:
    >> I'd been meaning to ask this. So the machines you have which don't
    >> describe 0xf0000 as reserved also don't describe it as RAM? (I guess
    >> it's either a hole in the table or one of the other e820 types).
    > Making 0xf0000 bus addresses RAM is probably a bad idea anyway. Most OS's
    > treat the E820 map with paranoia because we do see real PCs which
    > variously claim that the BIOS ROM space is RAM, ACPI, Reserved or just
    > forget to mention it.

    Actually I switched 64bit over to trust e820 completely and not
    reserve 640k-1MB explicitly some time ago
    and AFAIK there hasn't been any reports that it causes problems.

    So presumably trusting e802 is ok on modern systems (2003+)


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