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| author | Josh Poimboeuf <[email protected]> | 2023-09-04 22:04:45 -0700 |
|---|---|---|
| committer | Borislav Petkov (AMD) <[email protected]> | 2023-09-19 10:53:34 +0200 |
| commit | a8cf700c17d9ca6cb8ee7dc5c9330dbac3948237 (patch) | |
| tree | 64fc44764beadcd1f303536a84a5e3ec953e93e6 /tools/perf/scripts/python/gecko.py | |
| parent | 10f4c9b9a33b7df000f74fa0d896351fb1a61e6a (diff) | |
x86/srso: Fix srso_show_state() side effect
Reading the 'spec_rstack_overflow' sysfs file can trigger an unnecessary
MSR write, and possibly even a (handled) exception if the microcode
hasn't been updated.
Avoid all that by just checking X86_FEATURE_IBPB_BRTYPE instead, which
gets set by srso_select_mitigation() if the updated microcode exists.
Fixes: fb3bd914b3ec ("x86/srso: Add a Speculative RAS Overflow mitigation")
Signed-off-by: Josh Poimboeuf <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Borislav Petkov (AMD) <[email protected]>
Reviewed-by: Nikolay Borisov <[email protected]>
Acked-by: Borislav Petkov (AMD) <[email protected]>
Link: https://lore.kernel.org/r/27d128899cb8aee9eb2b57ddc996742b0c1d776b.1693889988.git.jpoimboe@kernel.org
Diffstat (limited to 'tools/perf/scripts/python/gecko.py')
0 files changed, 0 insertions, 0 deletions