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Documentation: Add L1D flushing Documentation

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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
This commit is contained in:
Balbir Singh
2021-01-08 23:10:56 +11:00
committed by Thomas Gleixner
parent e893bb1bb4
commit b7fe54f6c2
4 changed files with 95 additions and 0 deletions
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Documentation/userspace-api/spec_ctrl.rst
+8
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@@ -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);