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

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Message-ID: <20070316093145.GR23174@elte.hu>
Date:	Fri, 16 Mar 2007 10:31:45 +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.  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@...e.hu>

	Ingo
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