arm64: proton-pack: Report Spectre-BHB vulnerabilities as part of Spectre-v2
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: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NJames Morse <james.morse@arm.com>
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