Re: [Xen-devel] pci-passthrough not working on 4.0.1-rc1-pre: mm.c:3847:d10 Bad page 00000000001beab4: ed=ffff830151210000(10), sd=ffff830151210000, caf=8000000000000002, taf=7400000000000001

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

On Wed, Apr 21, 2010 at 11:44:40PM +0200, Sander Eikelenboom wrote:
> For the fun of it, with the 2.6.33 and pvgrub
> with kernel line iommu=soft of iommu=1 it fails to boot (no output from a 
> kernel booting)
> with kernel line iommu=off .. it boots fine.
> 
> Does something in the regular kernel around the iommu stuff get run that 
> early in the boot that if it fails it doesn't give output, and could that be 
> triggered by the handing over from mini-os to the actual kernel ?

Not around the code that handles the 'iommu=' stuff. It just sets a
variable (swiotlb in this case) to 1 if 'soft' is specified.


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