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x86/bugs: Add a Transient Scheduler Attacks mitigation

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Add the required features detection glue to bugs.c et all in order to
support the TSA mitigation.

Co-developed-by: Kim Phillips <kim.phillips@amd.com>
Signed-off-by: Kim Phillips <kim.phillips@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
This commit is contained in:
Borislav Petkov (AMD)
2024-09-11 10:53:08 +02:00
parent f9af88a3d3
commit d8010d4ba4
13 changed files with 232 additions and 7 deletions
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13
Documentation/admin-guide/kernel-parameters.txt
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@@ -7488,6 +7488,19 @@
having this key zero'ed is acceptable. E.g. in testing
scenarios.
tsa= [X86] Control mitigation for Transient Scheduler
Attacks on AMD CPUs. Search the following in your
favourite search engine for more details:
"Technical guidance for mitigating transient scheduler
attacks".
off - disable the mitigation
on - enable the mitigation (default)
user - mitigate only user/kernel transitions
vm - mitigate only guest/host transitions
tsc= Disable clocksource stability checks for TSC.
Format: <string>
[x86] reliable: mark tsc clocksource as reliable, this