stored in floating point, vector and integer registers.
See also <file:Documentation/admin-guide/hw-vuln/reg-file-data-sampling.rst>
-choice
- prompt "Clear branch history"
+config MITIGATION_SPECTRE_BHI
+ bool "Mitigate Spectre-BHB (Branch History Injection)"
depends on CPU_SUP_INTEL
- default SPECTRE_BHI_ON
+ default y
help
Enable BHI mitigations. BHI attacks are a form of Spectre V2 attacks
where the branch history buffer is poisoned to speculatively steer
indirect branches.
See <file:Documentation/admin-guide/hw-vuln/spectre.rst>
-config SPECTRE_BHI_ON
- bool "on"
- help
- Equivalent to setting spectre_bhi=on command line parameter.
-config SPECTRE_BHI_OFF
- bool "off"
- help
- Equivalent to setting spectre_bhi=off command line parameter.
-
-endchoice
-
endif
config ARCH_HAS_ADD_PAGES
};
static enum bhi_mitigations bhi_mitigation __ro_after_init =
- IS_ENABLED(CONFIG_SPECTRE_BHI_ON) ? BHI_MITIGATION_ON : BHI_MITIGATION_OFF;
+ IS_ENABLED(CONFIG_MITIGATION_SPECTRE_BHI) ? BHI_MITIGATION_ON : BHI_MITIGATION_OFF;
static int __init spectre_bhi_parse_cmdline(char *str)
{