On Tue, Dec 01, 2020 at 11:17:39PM +0800, Rongwei Wang wrote: > In ARM, the system registers can only be accessed through msr and mrs, > so the problem created by MSR driver (depend on rdmsr and wrmsr) in > x86 is not necessarily present in ARM, which is very different from > x86.
No, the point I'm making is that it doesn't matter what the architecture does or does not, register *writes* from userspace are a bad bad idea for the reasons I described. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette