Re: [Xen-devel] AMD_IOV: IO_PAGE_FALT trying to pass through Mellanox ConnectX HCA (debian testing)

["Roedel, Joerg" <Joerg.Roedel@xxxxxxx>]

On Mon, Feb 07, 2011 at 11:41:33AM -0500, Konrad Rzeszutek Wilk wrote:
> Any idea what this error might signify?
> > (XEN) AMD_IOV: IO_PAGE_FALT: domain:3, device id:0x200, fault 
> > address:0x7e7ca000
> > (XEN) AMD_IOV: IO_PAGE_FALT: domain:3, device id:0x200, fault 
> > address:0x7e7ca040
> > (XEN) AMD_IOV: IO_PAGE_FALT: domain:3, device id:0x200, fault 
> > address:0x7e7ca080
> > (XEN) AMD_IOV: IO_PAGE_FALT: domain:3, device id:0x200, fault 
> > address:0x7e7ca0c0
> 
> We have been stabing in the dark enabling certain knobs, .. but I am
> just curious - the fault address - that is the real physical address right?
> From the looks of it looks like a normal RAM region, not the PCI BAR space - 
> the
> AMD VI chipset doesn't really distinguish between those, or does it?

The fault-address is io-virtual, so this is not a ram physical address.
Basically this is the address the device sent a request to and which the
IOMMU tried to re-map. You should look into the guest memory layout to
find out what might be at those addresses.

                Joerg

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