linux-kernel - Re: [Intel IOMMU][patch 8/8] Preserve some Virtual Address when devices cannot address entire range.

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Message-ID: <adaabwx1mrp.fsf@cisco.com>
Date:	Tue, 24 Apr 2007 14:32:42 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	David Miller <davem@...emloft.net>
Cc:	ak@...e.de, ashok.raj@...el.com, linux-kernel@...r.kernel.org,
	akpm@...l.org, gregkh@...e.de, muli@...ibm.com,
	asit.k.mallick@...el.com, suresh.b.siddha@...el.com,
	anil.s.keshavamurthy@...el.com, arjan@...ux.intel.com,
	shaohua.li@...el.com
Subject: Re: [Intel IOMMU][patch 8/8] Preserve some Virtual Address when devices cannot address entire range.

 > My suggestion would be to allocate top-down in the 32-bit IOMMU space.

I think that's good for normal things, but it's not unreasonable to
want to map > 4 GB of memory at once for an Infiniband device.

So maybe we would want some heuristics about the size of the mapping
being requested or the amount of 32-bit space left to decide whether a
mapping should be below 4 GB.

 - R.
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