RE: [Xen-devel] IOMMU support: __direct_remap_pfn_range() fails

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> I am working on getting IOMMU support for AMD64.
> Thanks to the help of Jun Nakajima, Jerome Young, and Keir 
> Frasier, I have managed to get the aperture detected and 
> initialized.  However, the agpgart code is still failing.
> 
> I have tracked the problem down to line 92 of ioremap.c, in 
> __direct_remap_pfn_range().
> The failing instruction is a call to
> HYPERVISOR_mmu_update().  

What are the arguments to direct_remap_pfn_range?

With a verbose=y build of Xen what debug output do you get from xen (on
the serial line).

Ian

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