[Xen-devel] Re: [RFC, PATCH 7/24] i386 Vmi memory hole

[Chris Wright <chrisw@xxxxxxxxxxxx>]

* Zachary Amsden (zach@xxxxxxxxxx) wrote:
> Create a configurable hole in the linear address space at the top
> of memory.  A more advanced interface is needed to negotiate how
> much space the hypervisor is allowed to steal, but in the end, it
> seems most likely that a fixed constant size will be chosen for
> the compiled kernel, potentially propagated to an information
> page used by paravirtual initialization to determine interface
> compatibility.
> 
> Signed-off-by: Zachary Amsden <zach@xxxxxxxxxx>
> 
> Index: linux-2.6.16-rc3/arch/i386/Kconfig
> ===================================================================
> --- linux-2.6.16-rc3.orig/arch/i386/Kconfig   2006-02-22 16:09:04.000000000 
> -0800
> +++ linux-2.6.16-rc3/arch/i386/Kconfig        2006-02-22 16:33:27.000000000 
> -0800
> @@ -201,6 +201,15 @@ config VMI_DEBUG
>  
>  endmenu
>  
> +config MEMORY_HOLE
> +     int "Create hole at top of memory (0-256 MB)"
> +     range 0 256
> +     default "64" if X86_VMI
> +     default "0" if !X86_VMI

Deja-vu ;-)  And still works in context of Xen, but we've just let the
subarch define the __FIXADDR_TOP.  Having it be dynamic could be
interesting.

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