This issue just came to my attention while researching a network issue.. It is documented here: VMware Knowledge Base (yes this link does work but you may have to refresh your browser )
However, this KB has no details about any potential impact to enabling Direct Path IO when it is in fact not being mapped to any PCI device.
Before I start scripting to disable this on all the VMs where it was enabled via this bug, I would like to understand if there is any impact to simply leaving the setting as enabled within the virtual adapter..
Thanks in advance..