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x86/mm: Fix the 56-bit addresses memory map in Documentation/x86/x86_64/mm.txt

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This fixes a PT typo, and the following 56-bit address-space
addresses:

  * the hole extends from 0100000000000000 to feffffffffffffff
  * the KASAN shadow memory area stops at fffffbffffffffff (see kasan.h)

Signed-off-by: Stephen Kitt <steve@sk2.org>
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: 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: alex.popov@linux.com
Cc: bhe@redhat.com
Cc: corbet@lwn.net
Cc: kirill.shutemov@linux.intel.com
Cc: linux-doc@vger.kernel.org
Link: http://lkml.kernel.org/r/20190415150853.10354-1-steve@sk2.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Stephen Kitt 2019-04-15 17:08:53 +02:00 committed by Ingo Molnar
parent b569c18434
commit 89502a0197
1 changed files with 3 additions and 3 deletions
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6
Documentation/x86/x86_64/mm.txt
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@ -72,7 +72,7 @@ Complete virtual memory map with 5-level page tables
Notes: Notes:
- With 56-bit addresses, user-space memory gets expanded by a factor of 512x, - With 56-bit addresses, user-space memory gets expanded by a factor of 512x,
from 0.125 PB to 64 PB. All kernel mappings shift down to the -64 PT starting from 0.125 PB to 64 PB. All kernel mappings shift down to the -64 PB starting
offset and many of the regions expand to support the much larger physical offset and many of the regions expand to support the much larger physical
memory supported. memory supported.
@ -83,7 +83,7 @@ Notes:
0000000000000000 | 0 | 00ffffffffffffff | 64 PB | user-space virtual memory, different per mm 0000000000000000 | 0 | 00ffffffffffffff | 64 PB | user-space virtual memory, different per mm
__________________|____________|__________________|_________|___________________________________________________________ __________________|____________|__________________|_________|___________________________________________________________
| | | | | | | |
0000800000000000 | +64 PB | ffff7fffffffffff | ~16K PB | ... huge, still almost 64 bits wide hole of non-canonical 0100000000000000 | +64 PB | feffffffffffffff | ~16K PB | ... huge, still almost 64 bits wide hole of non-canonical
| | | | virtual memory addresses up to the -64 PB | | | | virtual memory addresses up to the -64 PB
| | | | starting offset of kernel mappings. | | | | starting offset of kernel mappings.
__________________|____________|__________________|_________|___________________________________________________________ __________________|____________|__________________|_________|___________________________________________________________
@ -99,7 +99,7 @@ ____________________________________________________________|___________________
ffd2000000000000 | -11.5 PB | ffd3ffffffffffff | 0.5 PB | ... unused hole ffd2000000000000 | -11.5 PB | ffd3ffffffffffff | 0.5 PB | ... unused hole
ffd4000000000000 | -11 PB | ffd5ffffffffffff | 0.5 PB | virtual memory map (vmemmap_base) ffd4000000000000 | -11 PB | ffd5ffffffffffff | 0.5 PB | virtual memory map (vmemmap_base)
ffd6000000000000 | -10.5 PB | ffdeffffffffffff | 2.25 PB | ... unused hole ffd6000000000000 | -10.5 PB | ffdeffffffffffff | 2.25 PB | ... unused hole
ffdf000000000000 | -8.25 PB | fffffdffffffffff | ~8 PB | KASAN shadow memory ffdf000000000000 | -8.25 PB | fffffbffffffffff | ~8 PB | KASAN shadow memory
__________________|____________|__________________|_________|____________________________________________________________ __________________|____________|__________________|_________|____________________________________________________________
| |
| Identical layout to the 47-bit one from here on: | Identical layout to the 47-bit one from here on: