x86 can return to user-space through sysexit and sysretq, which are not
core serializing. This breaks expectations from user-space about
sequential consistency from a single-threaded self-modifying program
point of view in specific migration patterns.

Feedback is welcome,

Thanks,

Mathieu

Mathieu Desnoyers (2):
  x86: Introduce sync_core_before_usermode
  Fix: x86: Add missing core serializing instruction on migration

 arch/x86/Kconfig                 |  1 +
 arch/x86/include/asm/processor.h | 10 ++++++++++
 include/linux/processor.h        |  6 ++++++
 kernel/sched/core.c              |  7 +++++++
 kernel/sched/sched.h             |  1 +
 5 files changed, 25 insertions(+)

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2.11.0