linux-kernel - Re: [patch 0/8] [Intel IOMMU] Support for Intel Virtualization Technology for Directed I/O

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Date:	Tue, 10 Apr 2007 16:27:53 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Ashok Raj <ashok.raj@...el.com>, linux-kernel@...r.kernel.org,
	akpm@...l.org, ak@...e.de, 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,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [patch 0/8] [Intel IOMMU] Support for Intel Virtualization
	Technology for Directed I/O

On Tue, 2007-04-10 at 04:21 -0400, Jeff Garzik wrote:
> Ashok Raj wrote:
> > 1. Support for ACPI framework to parse and work with DMA Remapping Tables.
> > 2. Add support for PCI infrastructure to search parent relationships.
> > 3. Hardware support for providing DMA remapping support for Intel Chipsets.
> > 4. Supporting Zero Length Reads on DMAR's not able to support ZLR.
> > 5. Graphics driver workarounds to provide unity map since they dont use dma api.
> > 6. Updates to Documentation area for startup options and some basics.
> > 7. Workaround to provide unity map for ISA bridge device to enable floppy disk.
> > 8. Ability to preserve some mappings for devices not able to address entire 
> >    range.
> 
> I really think it would be best to avoid ACPI for something as critical 
> as DMA remapping!
DMA remapping just uses ACPI table to tell which dma remapping engine a
pci device is controlled by at boot time. At run time, DMA remapping
hasn't any interactive with ACPI.

Thanks,
Shaohua
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