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Re: [Xen-devel] iommu support on AMD64




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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