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

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Message-ID: <bpyudbe6kvzlj37j7c6zo33zxfc537gos3fn5cbr32yz7ebu23@oeaxjofxyeao>
Date: Tue, 18 Nov 2025 11:48:19 +0000
From: Maciej Wieczor-Retman <m.wieczorretman@...me>
To: Alexander Potapenko <glider@...gle.com>
Cc: xin@...or.com, peterz@...radead.org, kaleshsingh@...gle.com, kbingham@...nel.org, akpm@...ux-foundation.org, nathan@...nel.org, ryabinin.a.a@...il.com, dave.hansen@...ux.intel.com, bp@...en8.de, morbo@...gle.com, jeremy.linton@....com, smostafa@...gle.com, kees@...nel.org, baohua@...nel.org, vbabka@...e.cz, justinstitt@...gle.com, wangkefeng.wang@...wei.com, leitao@...ian.org, jan.kiszka@...mens.com, fujita.tomonori@...il.com, hpa@...or.com, urezki@...il.com, ubizjak@...il.com, ada.coupriediaz@....com, nick.desaulniers+lkml@...il.com, ojeda@...nel.org, brgerst@...il.com, elver@...gle.com, pankaj.gupta@....com, mark.rutland@....com, trintaeoitogc@...il.com, jpoimboe@...nel.org, thuth@...hat.com, pasha.tatashin@...een.com, dvyukov@...gle.com, jhubbard@...dia.com, catalin.marinas@....com, yeoreum.yun@....com, mhocko@...e.com, lorenzo.stoakes@...cle.com, samuel.holland@...ive.com, vincenzo.frascino@....com, bigeasy@...utronix.de, surenb@...gle.com, ardb@...nel.org,
	Liam.Howlett@...cle.com, nicolas.schier@...ux.dev, ziy@...dia.com, kas@...nel.org, tglx@...utronix.de, mingo@...hat.com, broonie@...nel.org, corbet@....net, andreyknvl@...il.com, maciej.wieczor-retman@...el.com, david@...hat.com, maz@...nel.org, rppt@...nel.org, will@...nel.org, luto@...nel.org, kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, x86@...nel.org, linux-kbuild@...r.kernel.org, linux-mm@...ck.org, llvm@...ts.linux.dev, linux-doc@...r.kernel.org
Subject: Re: [PATCH v6 18/18] x86/kasan: Make software tag-based kasan available

On 2025-11-11 at 10:00:59 +0100, Alexander Potapenko wrote:
>On Wed, Oct 29, 2025 at 9:11 PM Maciej Wieczor-Retman
><m.wieczorretman@...me> wrote:
>>
>> From: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>
>>
>
>> -   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.

Sure, will do :)