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x86/speculation/mds: Add mds=full,nosmt cmdline option

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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>
This commit is contained in:
Josh Poimboeuf
2019-04-02 09:59:33 -05:00
committed by Thomas Gleixner
parent 5999bbe7a6
commit d71eb0ce10
3 changed files with 17 additions and 2 deletions
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3
Documentation/admin-guide/hw-vuln/mds.rst
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@@ -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.
============ =============================================================

6
Documentation/admin-guide/kernel-parameters.txt
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@@ -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.