2 Commits

Author	SHA1	Message	Date
Vipin Sharma	7aef27f0b2	svm/sev: Register SEV and SEV-ES ASIDs to the misc controller ... Secure Encrypted Virtualization (SEV) and Secure Encrypted Virtualization - Encrypted State (SEV-ES) ASIDs are used to encrypt KVMs on AMD platform. These ASIDs are available in the limited quantities on a host. Register their capacity and usage to the misc controller for tracking via cgroups. Signed-off-by: Vipin Sharma <vipinsh@google.com> Reviewed-by: David Rientjes <rientjes@google.com> Signed-off-by: Tejun Heo <tj@kernel.org>	2021-04-04 13:34:46 -04:00
Vipin Sharma	a72232eabd	cgroup: Add misc cgroup controller ... The Miscellaneous cgroup provides the resource limiting and tracking mechanism for the scalar resources which cannot be abstracted like the other cgroup resources. Controller is enabled by the CONFIG_CGROUP_MISC config option. A resource can be added to the controller via enum misc_res_type{} in the include/linux/misc_cgroup.h file and the corresponding name via misc_res_name[] in the kernel/cgroup/misc.c file. Provider of the resource must set its capacity prior to using the resource by calling misc_cg_set_capacity(). Once a capacity is set then the resource usage can be updated using charge and uncharge APIs. All of the APIs to interact with misc controller are in include/linux/misc_cgroup.h. Miscellaneous controller provides 3 interface files. If two misc resources (res_a and res_b) are registered then: misc.capacity A read-only flat-keyed file shown only in the root cgroup. It shows miscellaneous scalar resources available on the platform along with their quantities:: $ cat misc.capacity res_a 50 res_b 10 misc.current A read-only flat-keyed file shown in the non-root cgroups. It shows the current usage of the resources in the cgroup and its children:: $ cat misc.current res_a 3 res_b 0 misc.max A read-write flat-keyed file shown in the non root cgroups. Allowed maximum usage of the resources in the cgroup and its children.:: $ cat misc.max res_a max res_b 4 Limit can be set by:: # echo res_a 1 > misc.max Limit can be set to max by:: # echo res_a max > misc.max Limits can be set more than the capacity value in the misc.capacity file. Signed-off-by: Vipin Sharma <vipinsh@google.com> Reviewed-by: David Rientjes <rientjes@google.com> Signed-off-by: Tejun Heo <tj@kernel.org>	2021-04-04 13:34:46 -04:00