valid address space ?

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I am trying to dump some kernel data structure (walk e.g. task or file data structure  on x86_64 arch). Sometime accessing through a pointer, pointer may not be NULL, but pointing to invalid address due to garbage value.

What I am looking for is range of address which are valid for kernel data structure. Is it correct to say following address are valid ?

- Bit 0 - 47 are considered
- Between FFFF8000'00000000 through FFFFFFFF'FFFFFFFF
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