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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: |
Tue, 27 Feb 2007 11:11:43 +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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Tue, 27 Feb 2007 02:17:45 -0800 |
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* 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.
Ingo
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