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

* Jeremy Fitzhardinge <jeremy@xxxxxxxx> 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 <mingo@xxxxxxx>


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