On Tue, Sep 29, 2020 at 06:29:24PM +0200, Ansuel Smith wrote: > Qcom L2 Krait CPUs use the generic cpufreq-dt driver and doesn't actually > scale the Cache frequency when the CPU frequency is changed. This > devfreq driver register with the cpu notifier and scale the Cache > based on the max Freq across all core as the CPU cache is shared across > all of them. If provided this also scale the voltage of the regulator > attached to the CPU cache. The scaling logic is based on the CPU freq > and the 3 scaling interval are set by the device dts. > I have raised this concern before. I am worried this kind of independent CPU and cache frequency controls make way for clkscrew kind of attacks. Why can't the clocks be made parent/child or secondary and automatically updated when CPU clocks are changed. -- Regards, Sudeep
