[Xen-devel] Nested PCI bridge support of VT-d

["Jimmy Jin" <jimmyjin.maillist@xxxxxxxxx>]

Hi,

Is there a plan to enable the nested PCI bridge support of VT-d?
Currently, if there is nested PCI bridge, a message will shown saying
it's not supported. And if passing the card on the slot on a nested
PCI bridge, it seems some unexpected problem may occur.

I encounter this case when trying to pass through a PCI card to a
RHEL3 HVM on HP xw8600 workstation. The (only) PCI slot in xw8600 is
in a nested PCI bridge, according to lspci -t. If pass the card on
this PCI slot into a HVM, the system just hangs, I guess because some
problem occurs and causes the LSI SCSI controller on the same PCI
bridge not work correctly any more. On the same system, the pass
through of another PCI device (a on-board PCI Express NIC) is working
OK.

Thanks,
Jimmy Jin

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