This patch group has about 30% impact on syscall performance.
liwei (3):
Revert "x86/bugs: Replace CONFIG_SPECTRE_BHI_{ON,OFF} with
CONFIG_MITIGATION_SPECTRE_BHI"
Revert "x86/bugs: Remove CONFIG_BHI_MITIGATION_AUTO and
spectre_bhi=auto"
Revert "x86: set SPECTRE_BHI_ON as default"
Documentation/admin-guide/hw-vuln/spectre.rst | 4 ++++
.../admin-guide/kernel-parameters.txt | 3 +++
arch/x86/Kconfig | 21 ++++++++++++++++---
arch/x86/kernel/cpu/bugs.c | 10 ++++++++-
4 files changed, 34 insertions(+), 4 deletions(-)
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2.25.1