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

To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: [Xen-devel] Re: [patch 06/26] Xen-paravirt_ops: paravirt_ops: allocate a fixmap slot
From: Ingo Molnar <mingo@xxxxxxx>
Date: Fri, 16 Mar 2007 10:31:45 +0100
Cc: Zachary Amsden <zach@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxx, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Chris Wright <chrisw@xxxxxxxxxxxx>, Andi Kleen <ak@xxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
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* 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>

        Ingo

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