Clinton's VM did have virtio only network, as well as mine, and I also
thought the same about the e1000 emulation not being anywhere close to
host kernel. Anyway, I have been trying to reproduce this issue with the
attached VMs definition with no success.

To be honest, I'm starting to suspect on the CPU flags and microcode for
the specific CPUs. I'm wondering if any HW mitigation, from those CPU's
new microcodes, are stepping into our way here.

I haven't tested with apparmor enabled, that might be my next step here.

GRUB_CMDLINE_LINUX_DEFAULT=" ..."

In kernels:

- linux-image-5.0.0-32-generic
- linux-image-5.0.0-34-generic
- linux-image-5.3.0-21-generic

With and without host HW/kernel mitigations:

pti=off kpti=off nopcid noibrs noibpb spectre_v2=off
nospec_store_bypass_disable mds=off l1tf=off

With qemus:

- 1:3.1+dfsg-2ubuntu3.5
- 1:4.0+dfsg-0ubuntu10

with and without CPU flags:

- <feature policy='require' name='arch-capabilities'/>
- <feature policy='require' name='skip-l1dfl-vmentry'/>

with and without:

- all spice configuration (just like given example)
- with regular vnc basic configuration (no audio, usbs)

with Windows 2019:

- Standard Evaluation
- Build 17763.rs5_release.180914-1434

with machine types:

- i440fx
- q35

with the following CPU:

Architecture:                    x86_64
CPU op-mode(s):                  32-bit, 64-bit
Byte Order:                      Little Endian
Address sizes:                   39 bits physical, 48 bits virtual
CPU(s):                          4
On-line CPU(s) list:             0-3
Thread(s) per core:              2
Core(s) per socket:              2
Socket(s):                       1
NUMA node(s):                    1
Vendor ID:                       GenuineIntel
CPU family:                      6
Model:                           142
Model name:                      Intel(R) Core(TM) i5-7300U CPU @ 2.60GHz
Stepping:                        9

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https://bugs.launchpad.net/bugs/1849720

Title:
  Running VM with Virtual NIC Crashes Host OS

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