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[Xen-devel] Re: [PATCH 2/4] x86, xen: introduce x86_init.mapping.pagetab

To: stefano.stabellini@xxxxxxxxxxxxx
Subject: [Xen-devel] Re: [PATCH 2/4] x86, xen: introduce x86_init.mapping.pagetable_reserve
From: "H. Peter Anvin" <hpa@xxxxxxxxxxxxxxx>
Date: Wed, 13 Apr 2011 11:26:44 -0700
Cc: jeremy@xxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, konrad.wilk@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, "H. Peter Anvin" <hpa@xxxxxxxxx>, mingo@xxxxxxx, yinghai@xxxxxxxxxx
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On 04/12/2011 04:19 AM, stefano.stabellini@xxxxxxxxxxxxx wrote:
> From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> 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.


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