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From: Ryan Stone <rysto32@gmail.com>
Date: Mon, 10 Jul 2017 21:07:25 -0400
Message-ID: <CAFMmRNyhGWiSNAoYf+nsHtT4xE=0M4AohCfXR8sGadYP7==qyw@mail.gmail.com>
Subject: Re: Question on SRIOV vf -> pf mapping
To: "Somayajulu, David" <David.Somayajulu@cavium.com>
Cc: "freebsd-drivers@freebsd.org" <freebsd-drivers@freebsd.org>, 
 "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>
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This isn't possible in general.  When PCI Passthrough is in use, the VF
driver will run in the context of the VM's kernel and there is no device_t
corresponding to the PF at all.  If you're looking to pass information from
the PF down to the VF, then you need to establish some kind of
device-mediated side-channel to pass the information from host to guest.