> because correct code does not exist in user mode.
User mode code can run in the correct mode. What it cannot do is toggle the mode on/off. Once toggled on, it works perfectly fine for userspace; this could become e.g. a per-process flag enabled by a prctl syscall, with the MSR adjusted during scheduler task switching.
User mode code can run in the correct mode. What it cannot do is toggle the mode on/off. Once toggled on, it works perfectly fine for userspace; this could become e.g. a per-process flag enabled by a prctl syscall, with the MSR adjusted during scheduler task switching.