Re: [Xen-devel] [pvops-2.6.31.12 ]Fatal DMA error! Please use 'swiotlb=force' kernel BUG at drivers/pci/xen-iommu.c:227! invalid opcode: 0000 [#1] SMP

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Thu, Mar 11, 2010 at 11:44:53AM +0100, Sander Eikelenboom wrote:
> Hi Konrad ,
> 
> On this machine i'm using
> - xen-3.4.2
> - pvops 2.6.31.6 dom0 kernel
> - debian stock 2.6.26.2-xen kernels
> - All are 64bit, total system mem is 8GB, no hardware iommu present.
> 
> I'm passing through several pci devices with great succes (worked stable for 
> several months)
> - Soundcard
> - 1 PCI and 1 PCI-e USB 2.0 cards used for videograbbing
> 
> 
> 
> Now i have tried to passthrough a third USB card, (PCI-e, USB 3.0 in this 
> case), with a new pvops 2.6.31.12 kernel.
> 
> But although i specified swiotlb=force, something seems to go wrong with DMA 
> mapping, dmesg from the domU shows the error below.
> The complete dmesg output is attached.

Ugh. There is one more parameter you need to add, that is 'iommu=soft'.

That 'use swiotlb=force' nees to be fixed. Thanks for spotting it.

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