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While we're checking your concern, please share the PF and VF driver version loaded in your system.
My environment is:
Host: CentOS7.2 Linux 3.10.0-327.28.2.el7.x86_64
PF version is:
#ethtool -i enp4s0f0
Guest: FreeBSD 10.1
VF version is: 1.1.4 (obtained from source code: ixv.c)
FYI, I found the TxRx queue never disabled in Guest when ixv_disable_queue executed (write to EIMC).
So I turned off the TxRx MSI-x bit of EIAM in ixv VF driver. After that, in my test, the master abort never happened.
I am not sure if this EIAM and EIMC will cause VF master abort.
Thanks for your attention.