Re: [PATCH v6 18/18] x86/kasan: Make software tag-based kasan available

[Alexander Potapenko]

On Wed, Oct 29, 2025 at 9:11 PM Maciej Wieczor-Retman
<m.wieczorretman@xxxxx> wrote:
>
> From: Maciej Wieczor-Retman <maciej.wieczor-retman@xxxxxxxxx>
>

> -   ffffec0000000000 |  -20    TB | fffffbffffffffff |   16 TB | KASAN shadow memory
> +   ffffec0000000000 |  -20    TB | fffffbffffffffff |   16 TB | KASAN shadow memory (generic mode)
> +   fffff40000000000 |   -8    TB | fffffbffffffffff |    8 TB | KASAN shadow memory (software tag-based mode)
>    __________________|____________|__________________|_________|____________________________________________________________


> +   ffdf000000000000 |   -8.25 PB | fffffbffffffffff |   ~8 PB | KASAN shadow memory (generic mode)
> +   ffeffc0000000000 |   -6    PB | fffffbffffffffff |    4 PB | KASAN shadow memory (software tag-based mode)
>    __________________|____________|__________________|_________|____________________________________________________________

> +       default 0xeffffc0000000000 if KASAN_SW_TAGS
>         default 0xdffffc0000000000

Please elaborate in the patch description how these values were picked.