[v2] eIBRS fixes

[PATCH v2 0/7] eIBRS fixes

Pawan Gupta posted 7 patches 6 months, 3 weeks ago

Diff against v1 v3
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arch/x86/kernel/cpu/bugs.c | 82 +++++++++++++++++++++++++++-------------------
1 file changed, 48 insertions(+), 34 deletions(-)

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[PATCH v2 0/7] eIBRS fixes

Posted by Pawan Gupta 6 months, 3 weeks ago

v2:
- Split the ITS stuffing patch into smaller patches. (Borislav)
- Zap spectre_v2_in_retpoline_mode() helper. (Borislav)

v1: https://lore.kernel.org/r/20250520-eibrs-fix-v1-2-91bacd35ed09@linux.intel.com

tip/x86/core that has the restructured bugs.c including the recent ITS
mitigation has some disparities compared to upstream:

1. Spectre-v2 mitigation default is IBRS on eIBRS supported systems.
2. RSB stuffing mitigation for ITS is not allowed with eIBRS.

These couple of patches fixes the above issues.

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
---
Pawan Gupta (7):
      x86/retbleed: Check for AUTO in all cases
      x86/retbleed: Simplify the =stuff checks
      x86/bugs: Exit early if return thunk is already set
      x86/its: Use switch/case to apply mitigation
      x86/retbleed: Introduce cdt_possible()
      x86/its: Remove =stuff dependency on retbleed
      x86/its: Allow stuffing in eIBRS+retpoline mode also

 arch/x86/kernel/cpu/bugs.c | 82 +++++++++++++++++++++++++++-------------------
 1 file changed, 48 insertions(+), 34 deletions(-)
---
base-commit: 6a7c3c2606105a41dde81002c0037420bc1ddf00
change-id: 20250520-eibrs-fix-6c452b697dbf

-- 
Thanks,
Pawan