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xen-devel
[Xen-devel] Re: [patch 06/26] Xen-paravirt_ops: paravirt_ops: allocate a
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To: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Subject: |
[Xen-devel] Re: [patch 06/26] Xen-paravirt_ops: paravirt_ops: allocate a fixmap slot |
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From: |
Ingo Molnar <mingo@xxxxxxx> |
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Date: |
Fri, 16 Mar 2007 10:31:45 +0100 |
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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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Fri, 16 Mar 2007 02:30:53 -0700 |
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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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