From: "H. Peter Anvin" <hpa@zytor.com>
To: Andi Kleen <ak@suse.de>
Cc: David Miller <davem@davemloft.net>,
ashok.raj@intel.com, linux-kernel@vger.kernel.org, akpm@osdl.org,
gregkh@suse.de, muli@il.ibm.com, asit.k.mallick@intel.com,
suresh.b.siddha@intel.com, anil.s.keshavamurthy@intel.com,
arjan@linux.intel.com, shaohua.li@intel.com
Subject: Re: [Intel IOMMU][patch 8/8] Preserve some Virtual Address when devices cannot address entire range.
Date: Tue, 24 Apr 2007 18:12:51 -0700 [thread overview]
Message-ID: <462EAB13.4040104@zytor.com> (raw)
In-Reply-To: <200704250003.57968.ak@suse.de>
Andi Kleen wrote:
> On Tuesday 24 April 2007 23:50:26 David Miller wrote:
>> From: Ashok Raj <ashok.raj@intel.com>
>> Date: Tue, 24 Apr 2007 14:38:35 -0700
>>
>>> Its not clear if we have a very generic device breakage.. most devices
>>> on these platforms are going to be more recent, (except maybe some
>>> legacy fd)...
>> I'm not so sure, there are some "modern" sound cards that have
>> a 31-bit DMA addressing limitation because they use the 31st
>> bit as a status bit in their DMA descriptors :-)
>
> There's also a 2GB only megaraid RAID controller that's pretty popular
> because Dell shipped it for a long time.
>
You can probably find almost any possible bitmask if you look long
enough. Hardware vendors are notorious for this kind of "optimizations".
-hpa
next prev parent reply other threads:[~2007-04-25 1:13 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-24 6:02 [Intel IOMMU][patch 0/8] Intel IOMMU Support Ashok Raj
2007-04-24 6:03 ` [Intel IOMMU][patch 1/8] ACPI support for Intel Virtualization Technology for Directed I/O Ashok Raj
2007-04-24 18:50 ` Andi Kleen
2007-04-24 20:17 ` Ashok Raj
2007-04-24 6:03 ` [Intel IOMMU][patch 2/8] Some generic search functions required to lookup device relationships Ashok Raj
2007-04-24 6:03 ` [Intel IOMMU][patch 3/8] Generic hardware support for Intel IOMMU Ashok Raj
2007-04-24 19:27 ` Andi Kleen
2007-04-24 20:59 ` Ashok Raj
2007-04-25 1:17 ` Shaohua Li
2007-04-25 6:53 ` Andi Kleen
2007-04-24 6:03 ` [Intel IOMMU][patch 4/8] Supporting Zero Length Reads in " Ashok Raj
2007-04-24 19:28 ` Andi Kleen
2007-04-24 20:42 ` Ashok Raj
2007-04-24 21:00 ` David Miller
2007-04-24 6:03 ` [Intel IOMMU][patch 5/8] Graphics driver workarounds to provide unity map Ashok Raj
2007-04-24 6:03 ` [Intel IOMMU][patch 6/8] Doc updates for Intel Virtualization Technology for Directed I/O Ashok Raj
2007-04-24 6:03 ` [Intel IOMMU][patch 7/8] Support for legacy ISA devices Ashok Raj
2007-04-24 19:31 ` Andi Kleen
2007-04-24 20:33 ` Arjan van de Ven
2007-04-24 20:39 ` Ashok Raj
2007-04-24 6:03 ` [Intel IOMMU][patch 8/8] Preserve some Virtual Address when devices cannot address entire range Ashok Raj
2007-04-24 19:33 ` Andi Kleen
2007-04-24 20:33 ` Ashok Raj
2007-04-24 21:12 ` Andi Kleen
2007-04-24 21:23 ` David Miller
2007-04-24 21:32 ` Roland Dreier
2007-04-24 21:47 ` David Miller
2007-04-24 21:38 ` Ashok Raj
2007-04-24 21:50 ` David Miller
2007-04-24 22:03 ` Andi Kleen
2007-04-24 22:26 ` Ashok Raj
2007-04-25 1:12 ` H. Peter Anvin [this message]
2007-04-25 6:55 ` Andi Kleen
2007-04-24 23:22 ` Alan Cox
-- strict thread matches above, loose matches on Subject: below --
2007-04-23 16:38 [Intel IOMMU][patch 0/8] Intel IOMMU Support Ashok Raj
2007-04-23 16:38 ` [Intel IOMMU][patch 8/8] Preserve some Virtual Address when devices cannot address entire range Ashok Raj
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