What is the Higher Virtual Memory address (Kernel Mapping) of a process used to?

I have some questions on the Kernel mapping of a Linux process' higher virtual address: 1. Is that maps to the kernel text segment which is stored in the RAM(I read the

will be extracted to the RAM)? 2. What is the use of it? 3. The pmap of a process shows it's mapping to the exe's segments, shared memory,stack,heap. Can I see the higher address kernel mapped also?