add ax88772_rst

hc

2024-05-10 9999e48639b3cecb08ffb37358bcba3b48161b29

 kernel/Documentation/userspace-api/spec_ctrl.rst
..
..
@@ -28,18 +28,20 @@
28
28
 which is selected with arg2 of prctl(2). The return value uses bits 0-3 with
29
29
 the following meaning:
30
30
 
31
-==== ===================== ===================================================
32
-Bit  Define                Description
33
-==== ===================== ===================================================
34
-0    PR_SPEC_PRCTL         Mitigation can be controlled per task by
35
-                           PR_SET_SPECULATION_CTRL.
36
-1    PR_SPEC_ENABLE        The speculation feature is enabled, mitigation is
37
-                           disabled.
38
-2    PR_SPEC_DISABLE       The speculation feature is disabled, mitigation is
39
-                           enabled.
40
-3    PR_SPEC_FORCE_DISABLE Same as PR_SPEC_DISABLE, but cannot be undone. A
41
-                           subsequent prctl(..., PR_SPEC_ENABLE) will fail.
42
-==== ===================== ===================================================
31
+==== ====================== ==================================================
32
+Bit  Define                 Description
33
+==== ====================== ==================================================
34
+0    PR_SPEC_PRCTL          Mitigation can be controlled per task by
35
+                            PR_SET_SPECULATION_CTRL.
36
+1    PR_SPEC_ENABLE         The speculation feature is enabled, mitigation is
37
+                            disabled.
38
+2    PR_SPEC_DISABLE        The speculation feature is disabled, mitigation is
39
+                            enabled.
40
+3    PR_SPEC_FORCE_DISABLE  Same as PR_SPEC_DISABLE, but cannot be undone. A
41
+                            subsequent prctl(..., PR_SPEC_ENABLE) will fail.
42
+4    PR_SPEC_DISABLE_NOEXEC Same as PR_SPEC_DISABLE, but the state will be
43
+                            cleared on :manpage:`execve(2)`.
44
+==== ====================== ==================================================
43
45
 
44
46
 If all bits are 0 the CPU is not affected by the speculation misfeature.
45
47
 
..
..
@@ -94,6 +96,7 @@
94
96
    * prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS, PR_SPEC_ENABLE, 0, 0);
95
97
    * prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS, PR_SPEC_DISABLE, 0, 0);
96
98
    * prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS, PR_SPEC_FORCE_DISABLE, 0, 0);
99
+   * prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS, PR_SPEC_DISABLE_NOEXEC, 0, 0);
97
100
 
98
101
 - PR_SPEC_INDIR_BRANCH: Indirect Branch Speculation in User Processes
99
102
                         (Mitigate Spectre V2 style attacks against user processes)