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

[Muli Ben-Yehuda <muli@xxxxxxxxxx>]

On Thu, Nov 02, 2006 at 11:26:23AM +0000, Keir Fraser wrote:
> 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.

Fixing the un-holy Xen IOMMU initialization mes^H^H^Hcode is also a
good idea... would you be receptive to a forward port of
http://marc.theaimsgroup.com/?l=xen-devel&m=114840457908143&w=2 at
this time?

Cheers,
Muli

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