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Message-ID: <20190424065209.GC4038@hirez.programming.kicks-ass.net>
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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