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

To:	"Langsdorf, Mark" <mark.langsdorf@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	RE: [Xen-devel] IOMMU support: __direct_remap_pfn_range() fails
From:	"Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date:	Fri, 30 Sep 2005 22:26:54 +0100
Delivery-date:	Fri, 30 Sep 2005 21:24:30 +0000
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Thread-topic:	[Xen-devel] IOMMU support: __direct_remap_pfn_range() fails

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