Luca Boccassi
c10c2674f3
LUO sessions cannot be nested under other sessions. This means we need to handle them explicitly, and held them open in the shutdown binary like we do with our own internal session, to allow services to create their own. The requirement to support third party sessions comes from VMMs that wish to preserve VM(s) state(s) across kexec, as some file descriptors (KVM's vmfd from the KVM_CREATE_VM ioctl) cannot be transfered between processes via SCM_RIGHTS, so they cannot be stashed in the FD Store directly. Also some file descriptors have to be handled all together or not at all, again to do with KVM and devices that are all part of the same vm.
System and Service Manager
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