[$] The misc control group

Control groups (cgroups) are meant to limit access to a shared resource amongprocesses in the system. One such resource is the values used to specifyan encrypted-memory region for a virtual machine, such as the address-spaceidentifiers (ASIDs) used by the AMD SecureEncrypted Virtualization (SEV) feature. Vipin Sharma setout to add a control group for these ASIDs back in September; based on the feedback,though, he expanded the idea into a controller to track and limit any countable resource.The patch set became the controllerfor the misc control group and has been merged for Linux 5.13.