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xen-devel
[Xen-devel] Re: [patch 06/26] Xen-paravirt_ops: paravirt_ops: allocate a
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To: |
Ingo Molnar <mingo@xxxxxxx> |
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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: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Date: |
Tue, 27 Feb 2007 10:55:17 -0800 |
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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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Tue, 27 Feb 2007 10:54:28 -0800 |
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Ingo Molnar wrote:
> * Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:
>
>
>> Allocate a fixmap slot for use by a paravirt_ops implementation. 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.
>>
>
> why not vmalloc it on the guest side? fixmaps are bad for this purpose
> for a general paravirt implementation, it limits the size of the shared
> info page, etc.
Yes. vmalloc would have the annoying side-effect of actually allocating
some pages which would be shadowed by the remapping, but I guess
get_vm_area would do the job. I'll give it a go.
J
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