Re: [Xen-devel][PATCH] VT-d: Fix PCI-X device assignment

[Espen Skoglund <espen.skoglund@xxxxxxxxxxxxx>]

Hmm... so the bridge does not take ownership of the request coming
from PCI-X devices?  As far as I remember, this was not my experience
when I tried mapping a PCI-X device (or does my memory serve me
wrong?)  I guess different chipsets behaves differently then.  Do you
know if there is a way to detect how the bridge behaves?  If the
bridge does not take ownership of the requests then we don't want to
also map devfn 0 of the bus.

        eSk


[Weidong Han]
> When assign PCI device, current code just map its bridge and its
> secondary bus number and devfn 0. It doesn't work for PCI-x device
> assignment, because the request may be the source-id in the original
> PCI-X transaction or the source-id provided by the bridge. It needs
> to map the device itself, and its upstream bridges till
> PCIe-to-PCI/PCI-x bridge.  In addition, add description for
> DEV_TYPE_PCIe_BRIDGE and DEV_TYPE_PCI_BRIDGE for understandability.

> Signed-off-by: Weidong Han <weidong.han@xxxxxxxxx>
> _______________________________________________
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