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x86/bugs: Replace CONFIG_SPECTRE_BHI_{ON,OFF} with CONFIG_MITIGATION_SPECTRE_BHI 

For consistency with the other CONFIG_MITIGATION_* options, replace the
CONFIG_SPECTRE_BHI_{ON,OFF} options with a single
CONFIG_MITIGATION_SPECTRE_BHI option.

[ mingo: Fix ]

Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nikolay Borisov <nik.borisov@suse.com>
Link: https://lore.kernel.org/r/3833812ea63e7fdbe36bf8b932e63f70d18e2a2a.1712813475.git.jpoimboe@kernel.org
This commit is contained in:
Josh Poimboeuf 2024-04-10 22:40:51 -07:00 committed by Ingo Molnar
parent 36d4fe147c
commit 4f511739c5
2 changed files with 4 additions and 15 deletions
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17
arch/x86/Kconfig
View File

@ -2633,27 +2633,16 @@ config MITIGATION_RFDS
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

2
arch/x86/kernel/cpu/bugs.c
View File

@ -1628,7 +1628,7 @@ enum bhi_mitigations {
};
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)
{