kernel/arch/x86/include/asm/resctrl.h, branch linux-5.14.y

x86/resctrl: Apply READ_ONCE/WRITE_ONCE to task_struct.{rmid,closid}

2021-01-11T10:43:23Z

A CPU's current task can have its {closid, rmid} fields read locally while they are being concurrently written to from another CPU. This can happen anytime __resctrl_sched_in() races with either __rdtgroup_move_task() or rdt_move_group_tasks(). Prevent load / store tearing for those accesses by giving them the READ_ONCE() / WRITE_ONCE() treatment. Signed-off-by: Valentin Schneider Signed-off-by: Reinette Chatre Signed-off-by: Borislav Petkov Link: https://lkml.kernel.org/r/9921fda88ad81afb9885b517fbe864a2bc7c35a9.1608243147.git.reinette.chatre@intel.com

x86/cpu: Move resctrl CPUID code to resctrl/

2020-05-06T15:51:21Z

The function determining a platform's support and properties of cache occupancy and memory bandwidth monitoring (properties of X86_FEATURE_CQM_LLC) can be found among the common CPU code. After the feature's properties is populated in the per-CPU data the resctrl subsystem is the only consumer (via boot_cpu_data). Move the function that obtains the CPU information used by resctrl to the resctrl subsystem and rename it from init_cqm() to resctrl_cpu_detect(). The function continues to be called from the common CPU code. This move is done in preparation of the addition of some vendor specific code. No functional change. Suggested-by: Borislav Petkov Signed-off-by: Reinette Chatre Signed-off-by: Borislav Petkov Link: https://lkml.kernel.org/r/38433b99f9d16c8f4ee796f8cc42b871531fa203.1588715690.git.reinette.chatre@intel.com

x86/resctrl: Rename asm/resctrl_sched.h to asm/resctrl.h

2020-05-06T15:45:22Z

asm/resctrl_sched.h is dedicated to the code used for configuration of the CPU resource control state when a task is scheduled. Rename resctrl_sched.h to resctrl.h in preparation of additions that will no longer make this file dedicated to work done during scheduling. No functional change. Suggested-by: Borislav Petkov Signed-off-by: Reinette Chatre Signed-off-by: Borislav Petkov Link: https://lkml.kernel.org/r/6914e0ef880b539a82a6d889f9423496d471ad1d.1588715690.git.reinette.chatre@intel.com