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

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Date:	Tue, 1 Aug 2006 23:47:20 +0200
From:	Andi Kleen <ak@...e.de>
To:	virtualization@...ts.osdl.org
Cc:	Jeremy Fitzhardinge <jeremy@...source.com>,
	Andrew Morton <akpm@...l.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Ian Pratt <ian.pratt@...source.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Chris Wright <chrisw@...s-sol.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Christoph Lameter <clameter@....com>
Subject: Re: [PATCH 8 of 13] Add a bootparameter to reserve high linear address space for hypervisors

 
> +		/*
> +		 * 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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