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Re: [Xen-devel] Re: [pvops xen/next ][iommu] attenpt to passthrough PCI-

from [Jan Beulich] [Permanent Link][Original]
To: "Sander Eikelenboom" <linux@xxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Re: [pvops xen/next ][iommu] attenpt to passthrough PCI-e usb controllor to PV domU SUCCESS :-)
From: "Jan Beulich" <JBeulich@xxxxxxxxxx>
Date: Tue, 23 Mar 2010 11:23:36 +0000
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
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>>> Sander Eikelenboom <linux@xxxxxxxxxxxxxx> 23.03.10 11:23 >>>
>How do these handle DMA related to the passthrough device in a PV-guest then ?
>From what i remember from previous (debian) xen kernels was that at least 
>swiotlb=force was needed as kernel options to the domU kernel to passthrough 
>usb-controllers.

Yes, exactly. But not "iommu=soft".

Jan


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