Versions of the two final patches were submitted standalone earlier on. The series here tries to carry out a suggestion from Andrew, which the two of us have been discussing. Then said previously posted patches are re-based on top, utilizing the new functionality.
Xen: 1: spec-ctrl: add logic to issue IBPB on exit to guest 2: spec-ctrl: defer context-switch IBPB until guest entry 3: limit issuing of IBPB during context switch 4: PV: issue branch prediction barrier when switching 64-bit guest to kernel mode Linux (new): 1: x86/Xen: make use of IBPB controlling VM assist Jan
