There are several issues with the rtas_ibm_suspend_me code, which
enables platform-assisted suspension of an LPAR for migration or
hibernation as covered in PAPR 2.2.
1.) rtas_ibm_suspend_me uses on_each_cpu() to invoke
rtas_percpu_suspend_me on all cpus via IPI:
if
Nathan Lynch wrote:
3.) H_JOIN must be called with MSR[EE] off, but lazy interrupt
disabling may cause the caller of rtas_ibm_suspend_me to call H_JOIN
with it on; the local_irq_disable() in on_each_cpu() is not
sufficient.
Fix this by explicitly saving the MSR and clearing the EE bit
