diff options
| author | Josh Poimboeuf <jpoimboe@redhat.com> | 2019-04-02 16:59:33 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-04-02 20:02:36 +0200 |
| commit | d71eb0ce109a124b0fa714832823b9452f2762cf (patch) | |
| tree | e5efa2ea879a545d3eb552a83343c91f873e7ffb /Documentation | |
| parent | Documentation: Add MDS vulnerability documentation (diff) | |
| download | linux-d71eb0ce109a124b0fa714832823b9452f2762cf.tar.xz linux-d71eb0ce109a124b0fa714832823b9452f2762cf.zip | |
x86/speculation/mds: Add mds=full,nosmt cmdline option
Add the mds=full,nosmt cmdline option. This is like mds=full, but with
SMT disabled if the CPU is vulnerable.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Tyler Hicks <tyhicks@canonical.com>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/admin-guide/hw-vuln/mds.rst | 3 | ||||
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 6 |
2 files changed, 7 insertions, 2 deletions
diff --git a/Documentation/admin-guide/hw-vuln/mds.rst b/Documentation/admin-guide/hw-vuln/mds.rst index 1de29d28903d..244ab47d1fb3 100644 --- a/Documentation/admin-guide/hw-vuln/mds.rst +++ b/Documentation/admin-guide/hw-vuln/mds.rst @@ -260,6 +260,9 @@ time with the option "mds=". The valid arguments for this option are: It does not automatically disable SMT. + full,nosmt The same as mds=full, with SMT disabled on vulnerable + CPUs. This is the complete mitigation. + off Disables MDS mitigations completely. ============ ============================================================= diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 7325319c2c23..8f04985d3122 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -2372,8 +2372,10 @@ This parameter controls the MDS mitigation. The options are: - full - Enable MDS mitigation on vulnerable CPUs - off - Unconditionally disable MDS mitigation + full - Enable MDS mitigation on vulnerable CPUs + full,nosmt - Enable MDS mitigation and disable + SMT on vulnerable CPUs + off - Unconditionally disable MDS mitigation Not specifying this option is equivalent to mds=full. |