Re: [Xen-devel] PCI passthrough (pci-attach) to HVM guests bug (BAR64 addresses are bogus)

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 12.11.14 at 11:01, <malcolm.crossley@xxxxxxxxxx> wrote:
> As for the CRS regions: These typically describe the BIOS set limits in
> hardware configuration for the MMIO hole itself. On single socket
> systems anything which isn't RAM or another predefined region decodes to
> MMIO. This is probably why Jan's Dell system has a CRS region which
> covers the entire address space.
> 
> On multi socket systems the CRS is very important because the chipset is
> configured to only decode certain regions to the PCI express ports, if
> you use an address out side of those regions then accessing that address
> will go "nowhere" and the machine will crash.

Don't you mean multi-node instead of multi-socket here? Since what
matters is how the I/O subsystem is organized; the CPU topology is
pretty uninteresting for this.

Jan


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