RE: [Xen-devel] iommu support on AMD64

["Langsdorf, Mark" <mark.langsdorf@xxxxxxx>]

> > 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 the northbridge earlier than that.

I'd just figured out the IOPL was too low and was 
about to ask about that.  Thanks for the tip.

-Mark Langsdorf
AMD, Inc.


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