[PATCH 0/2] handle premature return from H_JOIN in pseries mobility code

[Nathan Lynch]

pseries VMs in shared processor mode are susceptible to failed
migrations becasue stray H_PRODs from the paravirt spinlock
implementation can bump threads out of joining state before the
suspend has occurred. Fix this by adding a small amount of shared
state and ordering accesses to it with respect to H_PROD and H_JOIN.

Nathan Lynch (2):
  powerpc/pseries/mobility: use struct for shared state
  powerpc/pseries/mobility: handle premature return from H_JOIN

 arch/powerpc/platforms/pseries/mobility.c | 48 +++++++++++++++++++++--
 1 file changed, 44 insertions(+), 4 deletions(-)

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2.29.2