[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 #3 from François Gouget <fgouget at codeweavers.com> ---
It turns out that the ntdll:exception Windows crash on wtbw1064 produces the
following kernel error messages on the host:

Dec 16 13:43:48 vm3 kernel: [  191.624802] kvm [2064]: vcpu0, guest rIP:
0xfffff803cb3c0bf3 kvm_set_msr_common: MSR_IA32_DEBUGCTLMSR 0x1, nop
Dec 16 13:43:48 vm3 kernel: [  191.624835] kvm [2064]: vcpu0, guest rIP:
0xfffff803cb3c0c5c unhandled rdmsr: 0x1c9

This happens even with QEMU 1:2.7+dfsg-3~bpo8+2 and linux-image 4.7.8-1~bpo8+1.
Fortunately looking up these messages turns up the following workaround which
lets ntdll:exception succeed.

   echo 1 >/sys/module/kvm/parameters/ignore_msrs

https://www.reddit.com/r/VFIO/comments/42dj7n/some_games_crash_to_biosboot_on_launch/


Todo:
1) Make sure the echo will be performed on boot, on all VM hosts so the Windows
10 VM can be moved around at will.
2) Report this QEMU issue if it has not been reported yet.
3) This implies checking whether this issue is specific to Intel hosts or if it
also happens on AMD ones (vm2).
4) Check whether it also happens on my TestBot rig.
5) I seem to remember the crash did not happen on the Windows 7 and 8.1 VMs
that were upgraded to Windows 10. Double-check, on a host know to have the
above issue (e.g. vm3).
6) Record the relevant QEMU bug(s) here so we can keep track of them.

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