x86/speculation/mds: Print SMT vulnerable on MSBDS with mitigations off

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commit e2c3c94788 upstream.

This code is only for CPUs which are affected by MSBDS, but are *not*
affected by the other two MDS issues.

For such CPUs, enabling the mds_idle_clear mitigation is enough to
mitigate SMT.

However if user boots with 'mds=off' and still has SMT enabled, we should
not report that SMT is mitigated:

$cat /sys//devices/system/cpu/vulnerabilities/mds
Vulnerable; SMT mitigated

But rather:
Vulnerable; SMT vulnerable

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Tyler Hicks <tyhicks@canonical.com>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lkml.kernel.org/r/20190412215118.294906495@localhost.localdomain
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Konrad Rzeszutek Wilk 2019-04-12 17:50:58 -04:00 • committed by Ben Hutchings

parent a96dbd772c

commit 1c9da0c864

1 changed files with 2 additions and 1 deletions

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arch/x86/kernel/cpu/bugs.c

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