Re: [Xen-devel] iommu support on AMD64

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 29 Sep 2005, at 19:41, Langsdorf, Mark wrote:

> The current aperture.c code in dom0 requires
> several calls to read_pci_config() to find
> the AMD northbridge.  These calls are causing
> my system to crash.
>
> read_pci_config() is defined in
> linux-2.6.12-xen0/include/asm-x86_64/pci-direct.h
> as
You probably need to set your IOPL to 1. There's a physdevop hypercall 
for doing that. We execute it during boot but you may be accessing teh 
northbridge earlier than that.
 -- Keir


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