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    SubjectRe: 2.6.25-rc1 xen pvops regression
    Ian Campbell wrote:
    > On Tue, 2008-02-19 at 23:43 -0800, H. Peter Anvin wrote:
    >
    >> Ian Campbell wrote:
    >>
    >>> On Mon, 2008-02-18 at 02:40 -0800, Joel Becker wrote:
    >>>
    >>>> On Sun, Feb 17, 2008 at 06:49:21PM +0000, Ian Campbell wrote:
    >>>>
    >>>>> x86/xen: Do not scan for DMI unless the DMI region is reserved by e820.
    >>>>>
    >>>> This fixed it. I'm now booting successfully. Thank you!
    >>>>
    >>> Excellent. Jeremy, are you happy for this to go in?
    >>>

    I had no problem with it, but Peter's objection seems substantial enough.

    > As far as the actual change goes I was assuming that any machine that
    > has DMI/SMBIOS would easily be new enough to have an E820 which could be
    > expected to reserve this region. Looks like I was mistaken about how
    > long E820 had been around and/or how reliably it is used to reserve the
    > tables.
    >
    > Anyway, will have to think of another solution.
    >

    Well, the way we've handled this kind of thing elsewhere is to just
    reserve that pseudophys address space in earlish Xen init code and fill
    it with not-DMI things (zero, I guess). It's a bit of a waste of
    memory, but maybe we can recover it once DMI has given up and gone
    away. This also makes it easy to insert faked-up DMI info if that turns
    out to be useful.


    J


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