[Bug 207446] Hang bringing up vtnet(4) on >8 cpu GCE VMs

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207446

--- Comment #5 from Bryan Venteicher <bryanv at FreeBSD.org> ---
(In reply to Jon Olson from comment #4)

The issue appears that GCE doesn't work when the guest driver requests fewer
than device's advertised max number of queue pairs. The FreeBSD driver will
request at most 8 queue pairs. The driver ends up hanging when calling into the
host (IIRC, during the VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET command).

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