On 09/17/2018 12:14 PM, Nathan Fontenot wrote: > When performing partition migrations all present CPUs must be online > as all present CPUs must make the H_JOIN call as part of the migration > process. Once all present CPUs make the H_JOIN call, one CPU is returned > to make the rtas call to perform the migration to the destination system. > > During testing of migration and changing the SMT state we have found > instances where CPUs are offlined, as part of the SMT state change, > before they make the H_JOIN call. This results in a hung system where > every CPU is either in H_JOIN or offline. > > To prevent this this patch disables CPU hotplug during the migration > process. > > Signed-off-by: Nathan Fontenot <nf...@linux.vnet.ibm.com>
Reviewed-by: Tyrel Datwyler <tyr...@linux.vnet.ibm.com>
