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    SubjectRe: [patch] paravirt: VDSO page is essential
    Roland McGrath wrote:
    > For everything else to work, it needs to be set by changing __FIXADDR_TOP,
    > which seems to be done by calling reserve_top_address early enough.
    > It looks like that needs to be properly tied into paravirt_ops somehow.
    >

    The startup code for whatever hypervisor you're running makes a call to
    reserve_top to reserve the appropriate amount of address space. This
    happens very early.

    J
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