Re: [Xen-devel] pciback for usb-controller and usb-storage on x86_64 ends in Oops

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 2/11/06 11:13, "Patrick Scharrenberg" <pittipatti@xxxxxx> wrote:

>> 
>> Is dma_ops == NULL at that point? If not, what value does it have?
>>   
> It is indeed NULL at that point and as far as I can see it's an issue of
> the fedora-kernel since there in arch/x86_64/mm/init-xen.c:mem_init()
> "pci_iommu_alloc()" is called instead of "no_iommu_init()"!
> I replaced pci_iommu_alloc() with the "pci_swiotlb_init()" /
> "no_iommu_init()"-block from xen-unstable and now it works!
> 
> The fedora init-xen.c looks very different to the one on your repository
> in many places, but I can't see if theses changes were intended or if
> it's just an older revision in the fedora-tree.

Most likely it's just a result of some dodgy forward porting from 2.6.16 to
2.6.18. We will upgrade our vanilla kernel version before 3.0.4 and it's
likely that vendors will sync with us when we do (or at least compare ports
for bugs).

Another 'fix' for the issue you saw, and maybe a good idea anyway if you
have 4GB or more of memory, is to put 'swiotlb=force,1' on your
driver-domain command line.

 -- Keir



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