[Bug 241774] FreeBSD 11.3 & 12.0 has broken SCSI & Networking on KVM/QEMU Q35 with OVMF

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241774

            Bug ID: 241774
           Summary: FreeBSD 11.3 & 12.0 has broken SCSI & Networking on
                    KVM/QEMU Q35 with OVMF
           Product: Base System
           Version: 11.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: drum at graphica.com.au

BUG:

FreeBSD VM's on Ubuntu KVM / QEMU / OVMF host have SCSI Disk and Network
Issues.

Network Interface: em / qemu e1000 / Intel Pro 1G no longer works with 11.3 (it
did work with 11.2) or 12.0

TESTING:

I have tested various FreeBSD VM configuration and have found issues with SCSI
and Network Device support when using: Ubuntu 19.04 / 19.10 KVM / QEMU Host
with: Q35 Machine and OVMF EFI Firmware.

Here is summary of testing:

FreeBSD 11.2 (on KVM / QEMU Q35 with OVMF)
SCSI disk - none work
SATA disk - works
Networking - only e1000 works

FreeBSD 11.2 (on KVM / QEMU Q35 with BIOS)
SCSI disk - works with lsisas1068 controller type
Network - only e1000 works

FreeBSD 11.3 (on KVM / QEMU Q35 with OVMF)
SCSI disk - none work
SATA disk - works
Networking - nothing works
NOTE: I also tested with custom kernel build (ie remove all bit minimal drivers
but leaving MPT/MPS & VirtIO SCSI and intel em and VirtIO Networking, still
does not work

FreeBSD 12.0 (on KVM / QEMU with OVMF)
SCSI disk - none works
SATA disk - works
Networking - nothing works

So in summary, in move from FreeBSD 11.2 -> 11.3 / 12.X
- networking is broken with KVM / QEMU / OVMF
- SCSI disk support is broken for all KVM / QEMU / OVMF

So while there is work around of SATA and BIOS, for new VMs, I have existing
VMs which need to be upgraded and this cannot be done, as network or disk
subsystem fails.

I can do additional testing / validation if required.

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