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| author | Josh Poimboeuf <[email protected]> | 2025-04-08 21:47:33 +0000 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2025-04-09 10:41:55 +0000 |
| commit | 18bae0dfec15b24ec14ca17dc18603372f5f254f (patch) | |
| tree | 32855ad9816301f74424af456152276859eb2f9e /rust/helpers/platform.c | |
| parent | x86/bugs: Fix RSB clearing in indirect_branch_prediction_barrier() (diff) | |
| download | kernel-18bae0dfec15b24ec14ca17dc18603372f5f254f.tar.gz kernel-18bae0dfec15b24ec14ca17dc18603372f5f254f.zip | |
x86/bugs: Don't fill RSB on VMEXIT with eIBRS+retpoline
eIBRS protects against guest->host RSB underflow/poisoning attacks.
Adding retpoline to the mix doesn't change that. Retpoline has a
balanced CALL/RET anyway.
So the current full RSB filling on VMEXIT with eIBRS+retpoline is
overkill. Disable it or do the VMEXIT_LITE mitigation if needed.
Suggested-by: Pawan Gupta <[email protected]>
Signed-off-by: Josh Poimboeuf <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Reviewed-by: Pawan Gupta <[email protected]>
Reviewed-by: Amit Shah <[email protected]>
Reviewed-by: Nikolay Borisov <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Vitaly Kuznetsov <[email protected]>
Cc: Sean Christopherson <[email protected]>
Cc: David Woodhouse <[email protected]>
Link: https://lore.kernel.org/r/84a1226e5c9e2698eae1b5ade861f1b8bf3677dc.1744148254.git.jpoimboe@kernel.org
Diffstat (limited to 'rust/helpers/platform.c')
0 files changed, 0 insertions, 0 deletions