[Xen-devel] Re: [PATCH 8 of 13] Add a bootparameter to reserve high linear address space for hypervisors

[Andi Kleen <ak@xxxxxxx>]

> +             /*
> +              * reservedtop=size reserves a hole at the top of the kernel
> +              * address space which a hypervisor can load into later.
> +              * Needed for dynamically loaded hypervisors, so relocating
> +              * the fixmap can be done before paging initialization.
> +              * This hole must be a multiple of 4M.
> +              */
> +             else if (!memcmp(from, "reservedtop=", 12)) {
> +                     unsigned long reserved = memparse(from+12, &from);
> +                     reserved &= ~0x3fffff;
> +                     set_fixaddr_top(-reserved);
> +             }

You need to add a dummy __setup for it, otherwise it will end up in
init's environments or be warned about.

Also it should be documented somewhere in Documentation

-Andi


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