6.8-stable review patch. If anyone has any objections, please let me know.
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From: Josh Poimboeuf jpoimboe@kernel.org
commit 4f511739c54b549061993b53fc0380f48dfca23b upstream.
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.171281347... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/Kconfig | 17 +++-------------- arch/x86/kernel/cpu/bugs.c | 2 +- 2 files changed, 4 insertions(+), 15 deletions(-)
--- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2612,27 +2612,16 @@ 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 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -1627,7 +1627,7 @@ 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) {