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    SubjectRe: 2.6.25-rc1 xen pvops regression
    Jeremy Fitzhardinge wrote:
    > H. Peter Anvin wrote:
    >>> Still curious about why a pagetable page is ending up in that range
    >>> though. Seems like it shouldn't be possible, since we shouldn't be
    >>> allowed to allocate from those pages, at least until the DMI probe
    >>> has happened... Unless the early allocator is only excluded from
    >>> e820 reserved pages, which would cause a problem on systems which
    >>> don't reserve the DMI space... HPA?
    >>>
    >>
    >> I thought the problem was a Xen-provided pagetable from before Linux
    >> started?
    >
    > Hm, I don't think so. The domain-builder pagetable is put after the
    > kernel, so it shouldn't be under 1M.
    >

    That's weird, then. If we put a page table at 0xf0000, it would crash
    hard on real hardware (there is ROM there); as I mentioned, I do have
    hardware which both reserves and doesn't reserve this region.

    -hpa


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