On 05/16/2018 04:01 AM, Russell King wrote: > When the branch predictor hardening is enabled, firmware must have set > the IBE bit in the auxiliary control register. If this bit has not > been set, the Spectre workarounds will not be functional. > > Add validation that this bit is set, and print a warning at alert level > if this is not the case. > > Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxx> Reviewed-by: Florian Fainelli <f.fainelli@xxxxxxxxx> I would be keen on updating arch/arm/kernel/head.S to to attempt setting ACTRL[0]=1 on A15/B15, if the kernel executes at the appropriate privilege level, this will succeed, if not, this should result in an ignored write. What do you think? -- Florian _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
