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x86/mm/doc: Clean up the x86-64 virtual memory layout descriptions 

In Documentation/x86/x86_64/mm.txt, the description of the x86-64 virtual
memory layout has become a confusing hodgepodge of inconsistencies:

 - there's a hard to read mixture of 'TB' and 'bits' notation
 - the entries sometimes mention a size in the description and sometimes not
 - sometimes they list holes by address, sometimes only as an 'unused hole' line

So make it all a coherent, readable, well organized description.

Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: corbet@lwn.net
Cc: linux-doc@vger.kernel.org
Cc: thgarnie@google.com
Link: http://lkml.kernel.org/r/20181006084327.27467-3-bhe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Baoquan He 2018-10-06 16:43:26 +08:00 committed by Ingo Molnar
parent 06d4a462e9
commit 5b12904065
1 changed files with 42 additions and 42 deletions
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84
Documentation/x86/x86_64/mm.txt
View File

@ -1,55 +1,55 @@
Virtual memory map with 4 level page tables:
0000000000000000 - 00007fffffffffff (=47 bits) user space, different per mm
hole caused by [47:63] sign extension
ffff800000000000 - ffff87ffffffffff (=43 bits) guard hole, reserved for hypervisor
ffff880000000000 - ffffc7ffffffffff (=64 TB) direct mapping of all phys. memory
ffffc80000000000 - ffffc8ffffffffff (=40 bits) hole
ffffc90000000000 - ffffe8ffffffffff (=45 bits) vmalloc/ioremap space
ffffe90000000000 - ffffe9ffffffffff (=40 bits) hole
ffffea0000000000 - ffffeaffffffffff (=40 bits) virtual memory map (1TB)
... unused hole ...
ffffec0000000000 - fffffbffffffffff (=44 bits) kasan shadow memory (16TB)
... unused hole ...
0000000000000000 - 00007fffffffffff (=47 bits, 128 TB) user space, different per mm
hole caused by [47:63] sign extension
ffff800000000000 - ffff87ffffffffff (=43 bits, 8 TB) guard hole, reserved for hypervisor
ffff880000000000 - ffffc7ffffffffff (=46 bits, 64 TB) direct mapping of all phys. memory (page_offset_base)
ffffc80000000000 - ffffc8ffffffffff (=40 bits, 1 TB) unused hole
ffffc90000000000 - ffffe8ffffffffff (=45 bits, 32 TB) vmalloc/ioremap space (vmalloc_base)
ffffe90000000000 - ffffe9ffffffffff (=40 bits, 1 TB) unused hole
ffffea0000000000 - ffffeaffffffffff (=40 bits, 1 TB) virtual memory map (vmemmap_base)
ffffeb0000000000 - ffffebffffffffff (=40 bits, 1 TB) unused hole
ffffec0000000000 - fffffbffffffffff (=44 bits, 16 TB) kasan shadow memory
fffffc0000000000 - fffffdffffffffff (=41 bits, 2 TB) unused hole
vaddr_end for KASLR
fffffe0000000000 - fffffe7fffffffff (=39 bits) cpu_entry_area mapping
fffffe8000000000 - fffffeffffffffff (=39 bits) LDT remap for PTI
ffffff0000000000 - ffffff7fffffffff (=39 bits) %esp fixup stacks
... unused hole ...
ffffffef00000000 - fffffffeffffffff (=64 GB) EFI region mapping space
... unused hole ...
ffffffff80000000 - ffffffff9fffffff (=512 MB) kernel text mapping, from phys 0
ffffffffa0000000 - fffffffffeffffff (1520 MB) module mapping space
fffffe0000000000 - fffffe7fffffffff (=39 bits, 512 GB) cpu_entry_area mapping
fffffe8000000000 - fffffeffffffffff (=39 bits, 512 GB) LDT remap for PTI
ffffff0000000000 - ffffff7fffffffff (=39 bits, 512 GB) %esp fixup stacks
ffffff8000000000 - fffffffeefffffff (~39 bits, ~507 GB) unused hole
ffffffef00000000 - fffffffeffffffff (=36 bits, 64 GB) EFI region mapping space
ffffffff00000000 - ffffffff7fffffff (=31 bits, 2 GB) unused hole
ffffffff80000000 - ffffffff9fffffff (=29 bits, 512 MB) kernel text mapping, from phys 0
ffffffffa0000000 - fffffffffeffffff (~31 bits, 1520 MB) module mapping space
[fixmap start] - ffffffffff5fffff kernel-internal fixmap range
ffffffffff600000 - ffffffffff600fff (=4 kB) legacy vsyscall ABI
ffffffffffe00000 - ffffffffffffffff (=2 MB) unused hole
ffffffffff600000 - ffffffffff600fff ( =4 kB) legacy vsyscall ABI
ffffffffffe00000 - ffffffffffffffff ( =2 MB) unused hole
Virtual memory map with 5 level page tables:
0000000000000000 - 00ffffffffffffff (=56 bits) user space, different per mm
hole caused by [56:63] sign extension
ff00000000000000 - ff0fffffffffffff (=52 bits) guard hole, reserved for hypervisor
ff10000000000000 - ff8fffffffffffff (=55 bits) direct mapping of all phys. memory
ff90000000000000 - ff9fffffffffffff (=52 bits) LDT remap for PTI
ffa0000000000000 - ffd1ffffffffffff (=54 bits) vmalloc/ioremap space (12800 TB)
ffd2000000000000 - ffd3ffffffffffff (=49 bits) hole
ffd4000000000000 - ffd5ffffffffffff (=49 bits) virtual memory map (512TB)
... unused hole ...
ffdf000000000000 - fffffc0000000000 (=53 bits) kasan shadow memory (8PB)
... unused hole ...
0000000000000000 - 00ffffffffffffff (=56 bits, 64 PB) user space, different per mm
hole caused by [56:63] sign extension
ff00000000000000 - ff0fffffffffffff (=52 bits, 4 PB) guard hole, reserved for hypervisor
ff10000000000000 - ff8fffffffffffff (=55 bits, 32 PB) direct mapping of all phys. memory (page_offset_base)
ff90000000000000 - ff9fffffffffffff (=52 bits, 4 PB) LDT remap for PTI
ffa0000000000000 - ffd1ffffffffffff (=53 bits, 12800 TB) vmalloc/ioremap space (vmalloc_base)
ffd2000000000000 - ffd3ffffffffffff (=49 bits, 512 TB) unused hole
ffd4000000000000 - ffd5ffffffffffff (=49 bits, 512 TB) virtual memory map (vmemmap_base)
ffd6000000000000 - ffdeffffffffffff (~51 bits, 2304 TB) unused hole
ffdf000000000000 - fffffdffffffffff (~53 bits, ~8 PB) kasan shadow memory
fffffc0000000000 - fffffdffffffffff (=41 bits, 2 TB) unused hole
vaddr_end for KASLR
fffffe0000000000 - fffffe7fffffffff (=39 bits) cpu_entry_area mapping
... unused hole ...
ffffff0000000000 - ffffff7fffffffff (=39 bits) %esp fixup stacks
... unused hole ...
ffffffef00000000 - fffffffeffffffff (=64 GB) EFI region mapping space
... unused hole ...
ffffffff80000000 - ffffffff9fffffff (=512 MB) kernel text mapping, from phys 0
ffffffffa0000000 - fffffffffeffffff (1520 MB) module mapping space
fffffe0000000000 - fffffe7fffffffff (=39 bits, 512 GB) cpu_entry_area mapping
fffffe8000000000 - fffffeffffffffff (=39 bits, 512 GB) unused hole
ffffff0000000000 - ffffff7fffffffff (=39 bits, 512 GB) %esp fixup stacks
ffffff8000000000 - ffffffeeffffffff (~39 bits, 444 GB) unused hole
ffffffef00000000 - fffffffeffffffff (=36 bits, 64 GB) EFI region mapping space
ffffffff00000000 - ffffffff7fffffff (31 bits, 2 GB) unused hole
ffffffff80000000 - ffffffff9fffffff (=29 bits, 512 MB) kernel text mapping, from phys 0
ffffffffa0000000 - fffffffffeffffff (~31 bits, 1520 MB) module mapping space
[fixmap start] - ffffffffff5fffff kernel-internal fixmap range
ffffffffff600000 - ffffffffff600fff (=4 kB) legacy vsyscall ABI
ffffffffffe00000 - ffffffffffffffff (=2 MB) unused hole
ffffffffff600000 - ffffffffff600fff ( =4 kB) legacy vsyscall ABI
ffffffffffe00000 - ffffffffffffffff ( =2 MB) unused hole
Architecture defines a 64-bit virtual address. Implementations can support
less. Currently supported are 48- and 57-bit virtual addresses. Bits 63