[Bug 40240] ntdll:exception causes the Windows 10 VM to crash

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=40240

--- Comment #7 from François Gouget <fgouget at codeweavers.com> ---
>From the todo list:

1) I created an init.d script so the workaround should now automatically be
applied on boot. It might be simpler to use a modeprobe.conf file though:
   echo "options kvm ignore_msrs=1" >> /etc/modprobe.d/local-kvm.conf
   Neither has really been tested since the hosts have not been restarted yet.

4) On my machine (i7-4790K) I have:
   $ cat /sys/module/kvm/parameters/ignore_msrs
   N

   Yet, I cannot crash the wtbw7u VM when I use its Windows 10 snapshot (that
VM has been upgraded to Windows 10, though the TestBot only uses the Windows 7
snapshot for now).

   But with the wtbw1064 VM the crash happens just as for the TestBot:
   - I get the same kvm errors in /var/log/syslog.
   - The same workaround fixes the issue.

This means this issue depends on some aspect of the guest environment and not
just on the host's configuration or CPU.

5) The point above confirms that this issue does not happen on all Windows 10
guests.

7) I uploaded source code to reproduce this issue.

All that remains now is checking if this issue happens on AMD processors (3,
but this seems optional), and reporting to QEMU (2) and recording the reference
here (6).

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