Hi Xen maintainers, In my patch series [XEN PATCH v4 0/5] FF-A notifications [1] I need to get a reference to a domain struct from a domain ID and keep it from being destroyed while using it in the interrupt handler notif_irq_handler() (introduced in the last patch "[XEN PATCH v4 5/5] xen/arm: ffa: support notification"). In my previous patch set [2] I used get_domain_by_id(), but from the following discussion rcu_lock_live_remote_domain_by_id() seems to be a better choice so that's what I'm using now in the v4 patch set. The domain lock is held during a call to vgic_inject_irq() and unlocked right after.
While we're reviewing the patch set in [1] I'd like to check the approach with rcu_lock_live_remote_domain_by_id() here. What do you think? Is using rcu_lock_live_remote_domain_by_id() the best approach? [1] https://patchew.org/Xen/20240502145645.1201613-1-jens.wiklan...@linaro.org/ [2] https://patchew.org/Xen/20240426084723.4149648-1-jens.wiklan...@linaro.org/ Thanks, Jens
