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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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