On 7/9/2010 5:09 PM, David Woodhouse wrote:
> Actually, given that we know the chipset, can't we just read the VT BARs
> directly from config space and check that the base address of the IOMMU
> we get is the right one for the I/OAT device?
>
> Something like...
>
>     pci_read_config_dword( ("0:0.0") , 0x48,&vtbar );
>     if (drhd->base_address != vtbar)
> 	WARN();

Ok, here is a patch that takes this approach.

David, will you sign off on this?

Chris, I'll add a tested-by line if you can give this a shot.

Thanks,
Dan