Hello,
if your host is installed on HP Proliant server have a look at this official article:
Document ID: c03835455
Advisory: (Revision) VMware ESXi 5.1 or ESXi 5.5 - The Virtual Machine Fails to Start and the Error Message "Device (PCI Bus/Dev/Fun) Is Not a Passthrough Device" Will Be Displayed
HP Support document - HP Support Center
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Regards,
P.