[Bug 220453] [Hyper-V] need to update Mellanox ConnectX-3 VF driver to support Live Migration

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220453

--- Comment #10 from pete at twisted.org.uk ---
Just a quick one, will try and add more detail tomorrow.

I am using r334458 on STABLE-11 which was more or less the point where 11_2
branched I believe. I can't see anything in 11_2 after that point which is
mlx4en or linuxkbi related. I can try doing an update tomorrow to the latest
STABLE and see though. Will try and prepare a box just for testing this.

The compile has the following in src.conf

# All our Intel machines are post-Core2
CPUTYPE?=core2
# We are using exim and cups
WITHOUT_SENDMAIL=true
WITHOUT_LPR=true

and the following in make.conf

# Build ports in local
WRKDIRPREFIX=/usr/local/port-build
# Use new format packages
WITH_PKGNG=yes
DISABLE_VULNERABILITIES=yes
# If we install cups it overwrites the base
CUPS_OVERWRITE_BASE=yes

I switched the interface over to accelerated networking and rebooted, but it
still came up using hn0. So I added a 'mlx4en_load="YES"' to loader.conf and
rebooted - which gave me the panic. I tried many times, it panicked every time.

The only oddity in the setup is I am booting off ZFS instead of UFS. Drive is
GPT partitioned, and I have the following in loader.conf

boot_serial="YES"
comconsole_speed="115200"
console="comconsole"
vfs.mountroot.timeout="300"
kern.geom.label.disk_ident.enable="0"
kern.geom.label.gptid.enable="0"
ahci_load="YES"
aesni_load="YES"
cryptodev_load="YES"
zfs_load="YES"
vfs.zfs.arc_max="1G"
vfs.zfs.prefetch_disable="1"
vfs.zfs.txg.timeout="5"
vfs.zfs.vdev.cache.size="10M"
vfs.zfs.vdev.cache.max="10M"

Don't know if any of that is significant at all - I assume adding the line to
loader.conf is the right thing to do, yes ?

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