linux-kernel - Re: [PATCH 2/4] x86,xen: introduce x86_init.mapping.pagetable

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Message-ID: <4DA5EAE4.2060406@linux.intel.com>
Date:	Wed, 13 Apr 2011 11:26:44 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	stefano.stabellini@...citrix.com
CC:	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	konrad.wilk@...cle.com, jeremy@...p.org, yinghai@...nel.org,
	mingo@...e.hu, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 2/4] x86,xen: introduce x86_init.mapping.pagetable_reserve

On 04/12/2011 04:19 AM, stefano.stabellini@...citrix.com wrote:
> From: Stefano Stabellini <stefano.stabellini@...citrix.com>
> 
> Introduce a new x86_init hook called pagetable_reserve that during the
> initial memory mapping is used to reserve a range of memory addresses for
> kernel pagetable usage.
> 
> On native it just calls memblock_x86_reserve_range while on xen it also
> takes care of setting the spare memory previously allocated
> for kernel pagetable pages from RO to RW, so that it can be used for
> other purposes.
> 

What are the *semantics* of this hook?

Hooks are insanely nasty if they are just defined by a particular code
flow, as evidenced by the royal mess called paravirt_ops.

	-hpa
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