From: Andi Kleen <andi@firstfloor.org>
To: Or Sagi <ors@tutis.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>, Nir Peleg <nir@tutis.com>
Subject: Re: [PATCH] Reserve low memory
Date: Mon, 22 Oct 2007 15:53:39 +0200 [thread overview]
Message-ID: <p73oder9rx8.fsf@bingen.suse.de> (raw)
In-Reply-To: <20071021165401.GA8626@cleopatra.qumranet.com> (Or Sagi's message of "Sun\, 21 Oct 2007 18\:54\:01 +0200")
Or Sagi <ors@tutis.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
>
prev parent reply other threads:[~2007-10-22 13:53 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-21 16:54 [PATCH] Reserve low memory Or Sagi
2007-10-22 13:53 ` Andi Kleen [this message]
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