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

To: "Jan Beulich" <JBeulich@xxxxxxxxxx>
Subject: Re: [Xen-devel] Re: [pvops xen/next ][iommu] attenpt to passthrough PCI-e usb controllor to PV domU SUCCESS :-)
From: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
Date: Tue, 23 Mar 2010 11:23:55 +0100
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
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Hello Jan,

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 


Tuesday, March 23, 2010, 11:16:37 AM, you wrote:

>>>> Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> 22.03.10 22:12 >>>
>>On Mon, Mar 22, 2010 at 11:26:52PM +0200, Pasi Kärkkäinen wrote:
>>> On Mon, Mar 22, 2010 at 10:23:00PM +0100, Sander Eikelenboom wrote:
>>> > Hello Pasi,
>>> > 
>>> > Ok added a few lines about it to that page.
>>> > 
>>> Ok. Are those options only needed for pvops domU kernel,
>>> or also for linux-2.6.18-xen guests? 
>>The 'swiotlb=force iommu=soft' are only needed when you do PCI
>>passthrough to PV guests and for all kernels (SLES10, RHEL5,
>>SLES11) and so on.

> I don't think that's true for SLE10/SLE11.

> Jan

Best regards,
 Sander                            mailto:linux@xxxxxxxxxxxxxx

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