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    SubjectRe: [patch 06/26] Xen-paravirt_ops: paravirt_ops: allocate a fixmap slot

    * Jeremy Fitzhardinge <> wrote:

    > Allocate a fixmap slot for use by a paravirt_ops implementation. This
    > is intended for early-boot bootstrap mappings. Once the zones and
    > allocator have been set up, it would be better to use get_vm_area() to
    > allocate some virtual space.
    > Xen uses this to map the hypervisor's shared info page, which doesn't
    > have a pseudo-physical page number, and therefore can't be mapped
    > ordinarily. It is needed early because it contains the vcpu state,
    > including the interrupt mask.

    Acked-by: Ingo Molnar <>

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