linux-kernel - Re: [PATCH] Reserve low memory

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Message-ID: <p73oder9rx8.fsf@bingen.suse.de>
Date:	Mon, 22 Oct 2007 15:53:39 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Or Sagi <ors@...is.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Nir Peleg <nir@...is.com>
Subject: Re: [PATCH] Reserve low memory

Or Sagi <ors@...is.com> writes:

> Adds a CONFIG_RESERVE_LOWMEM option which reserves all memory below
> CONFIG_PHYSICAL_START address.
>
> Cleans up some of the static early-boot memory allocations (nodemap, trampoline)
> Useful in particular for running virtual machines which require a 1:1 mapping 
> of the physical memory. This lets a virtual machine control a dma-capable device
> directly without hypervisor involvement.

With the infrastructure in 
ftp://firstfloor.org/pub/ak/x86_64/quilt/patches/early-reserve
you can do this much cleaner (and likely safer)

And using CONFIG_* options for such things is wrong anyways. If anything
it should be run time options.

-Andi
>
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