tested.

one physical machines ( which had this issue ) with 6 windows guest
having rebooting script every 10 secs.

after running around 2 days, there is no 0x5c BSOD. ( there was 0x5c
bsod after running 1 day )

Thanks.

** Tags removed: verification-needed-trusty
** Tags added: verification-done-trusty

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

Title:
  Windows guest got 0x5c BSOD when rebooting

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  Fix Committed

Bug description:
  [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 has 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

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