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| author | Balbir Singh <sblbir@amazon.com> | 2021-01-08 23:10:56 +1100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2021-07-28 11:42:25 +0200 |
| commit | b7fe54f6c2d437082dcbecfbd832f38edd9caaf4 (patch) | |
| tree | f0483d05dd7cc20f613c45568b74a4399073863d /Documentation/userspace-api | |
| parent | e893bb1bb4d2eb635eba61e5d9c5135d96855773 (diff) | |
| download | lwn-b7fe54f6c2d437082dcbecfbd832f38edd9caaf4.tar.gz lwn-b7fe54f6c2d437082dcbecfbd832f38edd9caaf4.zip | |
Documentation: Add L1D flushing Documentation
Add documentation of l1d flushing, explain the need for the
feature and how it can be used.
Signed-off-by: Balbir Singh <sblbir@amazon.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210108121056.21940-6-sblbir@amazon.com
Diffstat (limited to 'Documentation/userspace-api')
| -rw-r--r-- | Documentation/userspace-api/spec_ctrl.rst | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/userspace-api/spec_ctrl.rst b/Documentation/userspace-api/spec_ctrl.rst index 7ddd8f667459..5e8ed9eef9aa 100644 --- a/Documentation/userspace-api/spec_ctrl.rst +++ b/Documentation/userspace-api/spec_ctrl.rst @@ -106,3 +106,11 @@ Speculation misfeature controls * prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_INDIRECT_BRANCH, PR_SPEC_ENABLE, 0, 0); * prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_INDIRECT_BRANCH, PR_SPEC_DISABLE, 0, 0); * prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_INDIRECT_BRANCH, PR_SPEC_FORCE_DISABLE, 0, 0); + +- PR_SPEC_L1D_FLUSH: Flush L1D Cache on context switch out of the task + (works only when tasks run on non SMT cores) + + Invocations: + * prctl(PR_GET_SPECULATION_CTRL, PR_SPEC_L1D_FLUSH, 0, 0, 0); + * prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_L1D_FLUSH, PR_SPEC_ENABLE, 0, 0); + * prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_L1D_FLUSH, PR_SPEC_DISABLE, 0, 0); |