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Re: [Xen-devel] VT-d HowTo Update

To: Espen Skoglund <espen.skoglund@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] VT-d HowTo Update
From: Simon Horman <horms@xxxxxxxxxxxx>
Date: Wed, 22 Apr 2009 09:14:29 +1000
Cc: Christian Tramnitz <chris.ace@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, "Han, Weidong" <weidong.han@xxxxxxxxx>, "Cui, Dexuan" <dexuan.cui@xxxxxxxxx>
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On Tue, Apr 21, 2009 at 11:08:39AM +0100, Espen Skoglund wrote:
> You may also want to mention the various boot time parameters (or at
> least some of them).  The following comment is snipped from
> xen/drivers/passthrough/iommu.c.
>       eSk
> /*
>  * The 'iommu' parameter enables the IOMMU.  Optional comma separated
>  * value may contain:
>  *
>  *   off|no|false|disable       Disable IOMMU (default)
>  *   pv                         Enable IOMMU for PV domains
>  *   no-pv                      Disable IOMMU for PV domains (default)
>  *   force|required             Don't boot unless IOMMU is enabled
>  *   passthrough                Enable VT-d DMA passthrough (no DMA
>  *                              translation for Dom0)
>  *   no-snoop                   Disable VT-d Snoop Control
>  *   no-qinval                  Disable VT-d Queued Invalidation
>  *   no-intremap                Disable VT-d Interrupt Remapping
>  */

Thanks, that is a good point. Though to be honest I'm not
entirely sure what the last 3 options do.

Simon Horman
  VA Linux Systems Japan K.K. Satellite Lab in Sydney, Australia
  H: www.vergenet.net/~horms/            W: www.valinux.co.jp/en

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