Linux Kernel https://git.stealer.net/cgit.cgi/user/sven/linux.git/atom?h=v5.15.199 2021-04-04T22:29:37Z 2021-04-04T22:29:37Z Tejun Heo tj@kernel.org 2021-04-04T22:29:37Z urn:sha1:dd3f4e4972f146a685930ccfed95e4e1d13d952a The dummy implementation was missing static inline triggering the following compile warning on llvm. In file included from arch/x86/kvm/svm/sev.c:17: >> include/linux/misc_cgroup.h:98:15: warning: no previous prototype for function 'misc_cg_res_total_usage' [-Wmissing-prototypes] unsigned long misc_cg_res_total_usage(enum misc_res_type type) ^ include/linux/misc_cgroup.h:98:1: note: declare 'static' if the function is not intended to be used outside of this translation unit unsigned long misc_cg_res_total_usage(enum misc_res_type type) ^ static 1 warning generated. Add it. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: kernel test robot <lkp@intel.com> 2021-04-04T17:34:46Z Vipin Sharma vipinsh@google.com 2021-03-30T04:42:06Z urn:sha1:7aef27f0b2a8a58c28578d3e0caf3f27e1a1c39c 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> 2021-04-04T17:34:46Z Vipin Sharma vipinsh@google.com 2021-03-30T04:42:04Z urn:sha1:a72232eabdfcfe365a05a3eb392288b78d25a5ca 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>