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

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Message-ID: <461B4C28.4010806@garzik.org>
Date:	Tue, 10 Apr 2007 04:34:48 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Shaohua Li <shaohua.li@...el.com>
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

Shaohua Li wrote:
> 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.

The Linux kernel _really_ wants a non-ACPI way to detect this.

Just use the hardware registers themselves, you don't need an ACPI table.

	Jeff


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