Public bug reported:

[Impact]

When rebooting Windows guest, it gets 0x5c BSOD
Impact to 3.13 ( trusty )
no Impact to 4.x 

[Fix]

Upstream development
4114c27d450bef228be9c7b0c40a888e18a3a636
("KVM: x86: reset RVI upon system reset")
6d2a0526b09e551d0f395cfb63e7cb965db825af
("KVM: x86: Emulator should set DR6 upon GD like real CPU")

and got one MACRO definition from below commit as 6d2a05's dependency
6f43ed01e87c8a8dbd8c826eaf0f714c1342c039
(whole 6f43ed commit is a lot of dependency to the other commits)

[Testcase]

Running 6 windows vms( 2012r2 ) on one single server.
auto rebooting scripts in windows guest.
after one day (around hundred rebooting), can get 0x5c certainly

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1660519

Title:
  Windows guest got 0x5c BSOD when rebooting

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