arm64: proton-pack: Report Spectre-BHB vulnerabilities as part of Spectre-v2

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Speculation attacks against some high-performance processors can
make use of branch history to influence future speculation as part of
a spectre-v2 attack. This is not mitigated by CSV2, meaning CPUs that
previously reported 'Not affected' are now moderately mitigated by CSV2.

Update the value in /sys/devices/system/cpu/vulnerabilities/spectre_v2
to also show the state of the BHB mitigation.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>

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This commit is contained in:

James Morse 2022-02-08 16:08:13 +00:00

parent bd09128d16

commit dee435be76

2 changed files with 36 additions and 2 deletions

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2

arch/arm64/include/asm/spectre.h

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36

arch/arm64/kernel/proton-pack.c

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