This release fixes two critical issues:

1) Performance was bad in previous versions (QEMU would stay at 80% + even
   when the guest was idle).  Root cause was a latent KVM bug that was not
   exposed with the original interrupt model.  Namely, interrupts were not
   checked during light-exit (see Patch #2).  The behavior we were seeing was
   caused by the system continuously halting, only to determine that there
   were interrupts pending and executing a light-exit.  However, the
   interrupts were never injected so the guest would just tight loop on HLT.

2) Fixed corruption issue were signal reception in the new interrupt code
   could cause us to return to userspace without restoring the host state
   properly.

Regards,
-Greg

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