linux-kernel - Re: [patch 06/26] Xen-paravirt_ops: paravirt

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Message-ID: <20070227101143.GC10827@elte.hu>
Date:	Tue, 27 Feb 2007 11:11:43 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Andi Kleen <ak@....de>, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org,
	xen-devel@...ts.xensource.com, Chris Wright <chrisw@...s-sol.org>,
	Zachary Amsden <zach@...are.com>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [patch 06/26] Xen-paravirt_ops: paravirt_ops: allocate a fixmap slot


* Jeremy Fitzhardinge <jeremy@...p.org> 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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