From mboxrd@z Thu Jan  1 00:00:00 1970
From: Avi Kivity <avi@qumranet.com>
Subject: Re: VT-d support for device assignment
Date: Fri, 22 Aug 2008 21:21:15 +0300
Message-ID: <48AF039B.7040805@qumranet.com>
References: <1219389054-15332-1-git-send-email-amit.shah@qumranet.com>
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Cc: kvm@vger.kernel.org, muli@il.ibm.com, anthony@codemonkey.ws,
	jesse.barnes@intel.com, david.woodhouse@intel.com,
	mark.gross@intel.com, benami@il.ibm.com, weidong.han@intel.com
To: Amit Shah <amit.shah@qumranet.com>
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Amit Shah wrote:
> The following two patches contain VT-d support for device assignment
> for KVM guests.
>
> The first patch contains the changes that are required to the generic
> VT-d code.
>
> The second patch contains the changes to KVM.
>
> I've updated the 2nd patch to use VT-d only when requested by a parameter
> on the command line, making it easier to support iommu with pvdma and
> multiple iommu types.
>
> The command line currently should be invoked as:
>
> -pcidevice dev=00:13.0,vtd=on
>   

You mean, iommu=on.

Or rather

  dma=iommu
  dma=none (1:1 mapping, or dma-less devices, or I'm Feeling Lucky)
  dma=cooperative (paravirt)

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.