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Date: Wed, 24 Apr 2019 08:52:09 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Borislav Petkov <bp@...en8.de>
Cc: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
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	Changbin Du <changbin.du@...il.com>
Subject: Re: [PATCH v2 56/79] docs: Documentation/*.txt: rename all ReST
 files to *.rst

On Tue, Apr 23, 2019 at 11:38:16PM +0200, Borislav Petkov wrote:
> If that is all the changes it would need, then I guess that's ok. Btw,
> those rst-conversion patches don't really show what got changed. Dunno
> if git can even show that properly. I diffed the two files by hand to
> see what got changed, see end of mail.

That is not a happy diff; that table has gotten waay worse to read due
to all that extra table crap.

> ---
> --- mm.old	2019-04-23 23:18:55.954335784 +0200
> +++ mm.new	2019-04-23 23:18:48.122335821 +0200
> @@ -18,51 +18,68 @@ Notes:
>     notation than "16 EB", which few will recognize at first sight as 16 exabytes.
>     It also shows it nicely how incredibly large 64-bit address space is.
>  
> -========================================================================================================================
> -    Start addr    |   Offset   |     End addr     |  Size   | VM area description
> -========================================================================================================================
> -                  |            |                  |         |
> - 0000000000000000 |    0       | 00007fffffffffff |  128 TB | user-space virtual memory, different per mm
> -__________________|____________|__________________|_________|___________________________________________________________
> -                  |            |                  |         |
> - 0000800000000000 | +128    TB | ffff7fffffffffff | ~16M TB | ... huge, almost 64 bits wide hole of non-canonical
> -                  |            |                  |         |     virtual memory addresses up to the -128 TB
> -                  |            |                  |         |     starting offset of kernel mappings.
> -__________________|____________|__________________|_________|___________________________________________________________
> -                                                            |
> -                                                            | Kernel-space virtual memory, shared between all processes:
> -____________________________________________________________|___________________________________________________________
> -                  |            |                  |         |
> - ffff800000000000 | -128    TB | ffff87ffffffffff |    8 TB | ... guard hole, also reserved for hypervisor
> - ffff880000000000 | -120    TB | ffff887fffffffff |  0.5 TB | LDT remap for PTI
> - ffff888000000000 | -119.5  TB | ffffc87fffffffff |   64 TB | direct mapping of all physical memory (page_offset_base)
> - ffffc88000000000 |  -55.5  TB | ffffc8ffffffffff |  0.5 TB | ... unused hole
> - ffffc90000000000 |  -55    TB | ffffe8ffffffffff |   32 TB | vmalloc/ioremap space (vmalloc_base)
> - ffffe90000000000 |  -23    TB | ffffe9ffffffffff |    1 TB | ... unused hole
> - ffffea0000000000 |  -22    TB | ffffeaffffffffff |    1 TB | virtual memory map (vmemmap_base)
> - ffffeb0000000000 |  -21    TB | ffffebffffffffff |    1 TB | ... unused hole
> - ffffec0000000000 |  -20    TB | fffffbffffffffff |   16 TB | KASAN shadow memory
> -__________________|____________|__________________|_________|____________________________________________________________
> -                                                            |
> -                                                            | Identical layout to the 56-bit one from here on:
> -____________________________________________________________|____________________________________________________________
> -                  |            |                  |         |
> - fffffc0000000000 |   -4    TB | fffffdffffffffff |    2 TB | ... unused hole
> -                  |            |                  |         | vaddr_end for KASLR
> - fffffe0000000000 |   -2    TB | fffffe7fffffffff |  0.5 TB | cpu_entry_area mapping
> - fffffe8000000000 |   -1.5  TB | fffffeffffffffff |  0.5 TB | ... unused hole
> - ffffff0000000000 |   -1    TB | ffffff7fffffffff |  0.5 TB | %esp fixup stacks
> - ffffff8000000000 | -512    GB | ffffffeeffffffff |  444 GB | ... unused hole
> - ffffffef00000000 |  -68    GB | fffffffeffffffff |   64 GB | EFI region mapping space
> - ffffffff00000000 |   -4    GB | ffffffff7fffffff |    2 GB | ... unused hole
> - ffffffff80000000 |   -2    GB | ffffffff9fffffff |  512 MB | kernel text mapping, mapped to physical address 0
> - ffffffff80000000 |-2048    MB |                  |         |
> - ffffffffa0000000 |-1536    MB | fffffffffeffffff | 1520 MB | module mapping space
> - ffffffffff000000 |  -16    MB |                  |         |
> -    FIXADDR_START | ~-11    MB | ffffffffff5fffff | ~0.5 MB | kernel-internal fixmap range, variable size and offset
> - ffffffffff600000 |  -10    MB | ffffffffff600fff |    4 kB | legacy vsyscall ABI
> - ffffffffffe00000 |   -2    MB | ffffffffffffffff |    2 MB | ... unused hole
> -__________________|____________|__________________|_________|___________________________________________________________
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|   Start addr    |   Offset   |     End addr     |  Size   | VM area description                                       |
> ++=================+============+==================+=========+===========================================================+
> +|                 |            |                  |         |                                                           |
> +|0000000000000000 |    0       | 00007fffffffffff |  128 TB | user-space virtual memory, different per mm               |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|                 |            |                  |         |                                                           |
> +|0000800000000000 | +128    TB | ffff7fffffffffff | ~16M TB | ... huge, almost 64 bits wide hole of non-canonical       |
> +|                 |            |                  |         | virtual memory addresses up to the -128 TB                |
> +|                 |            |                  |         | starting offset of kernel mappings.                       |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|                      **Kernel-space virtual memory, shared between all processes:**                                   |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|ffff800000000000 | -128    TB | ffff87ffffffffff |    8 TB | ... guard hole, also reserved for hypervisor              |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|ffff880000000000 | -120    TB | ffff887fffffffff |  0.5 TB | LDT remap for PTI                                         |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|ffff888000000000 | -119.5  TB | ffffc87fffffffff |   64 TB | direct mapping of all physical memory (page_offset_base)  |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|ffffc88000000000 |  -55.5  TB | ffffc8ffffffffff |  0.5 TB | ... unused hole                                           |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|ffffc90000000000 |  -55    TB | ffffe8ffffffffff |   32 TB | vmalloc/ioremap space (vmalloc_base)                      |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|ffffe90000000000 |  -23    TB | ffffe9ffffffffff |    1 TB | ... unused hole                                           |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|ffffea0000000000 |  -22    TB | ffffeaffffffffff |    1 TB | virtual memory map (vmemmap_base)                         |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|ffffeb0000000000 |  -21    TB | ffffebffffffffff |    1 TB | ... unused hole                                           |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|ffffec0000000000 |  -20    TB | fffffbffffffffff |   16 TB | KASAN shadow memory                                       |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|                         **Identical layout to the 56-bit one from here on:**                                          |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|fffffc0000000000 |   -4    TB | fffffdffffffffff |    2 TB | ... unused hole                                           |
> +|                 |            |                  |         | vaddr_end for KASLR                                       |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|fffffe0000000000 |   -2    TB | fffffe7fffffffff |  0.5 TB | cpu_entry_area mapping                                    |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|fffffe8000000000 |   -1.5  TB | fffffeffffffffff |  0.5 TB | ... unused hole                                           |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|ffffff0000000000 |   -1    TB | ffffff7fffffffff |  0.5 TB | %esp fixup stacks                                         |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|ffffff8000000000 | -512    GB | ffffffeeffffffff |  444 GB | ... unused hole                                           |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|ffffffef00000000 |  -68    GB | fffffffeffffffff |   64 GB | EFI region mapping space                                  |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|ffffffff00000000 |   -4    GB | ffffffff7fffffff |    2 GB | ... unused hole                                           |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|ffffffff80000000 |   -2    GB | ffffffff9fffffff |  512 MB | kernel text mapping, mapped to physical address 0         |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|ffffffff80000000 |-2048    MB |                  |         |                                                           |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|ffffffffa0000000 |-1536    MB | fffffffffeffffff | 1520 MB | module mapping space                                      |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|ffffffffff000000 |  -16    MB |                  |         |                                                           |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|   FIXADDR_START | ~-11    MB | ffffffffff5fffff | ~0.5 MB | kernel-internal fixmap range, variable size and offset    |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|ffffffffff600000 |  -10    MB | ffffffffff600fff |    4 kB | legacy vsyscall ABI                                       |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+
> +|ffffffffffe00000 |   -2    MB | ffffffffffffffff |    2 MB | ... unused hole                                           |
> ++-----------------+------------+------------------+---------+-----------------------------------------------------------+

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