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

[Shaohua Li <shaohua.li@intel.com>]

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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