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

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>
hifive-unleashed-5.2
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:
- 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
memory supported.
@ -83,7 +83,7 @@ Notes:
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
| | | | starting offset of kernel mappings.
__________________|____________|__________________|_________|___________________________________________________________
@ -99,7 +99,7 @@ ____________________________________________________________|___________________
ffd2000000000000 | -11.5 PB | ffd3ffffffffffff | 0.5 PB | ... unused hole
ffd4000000000000 | -11 PB | ffd5ffffffffffff | 0.5 PB | virtual memory map (vmemmap_base)
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: