linux-kernel - [RFC 0/2] relax anon mTHP PTE Mapping restrictions

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250120012230.3343-1-ioworker0@gmail.com>
Date: Mon, 20 Jan 2025 09:22:28 +0800
From: Lance Yang <ioworker0@...il.com>
To: akpm@...ux-foundation.org
Cc: 21cnbao@...il.com,
	ryan.roberts@....com,
	dev.jain@....com,
	david@...hat.com,
	shy828301@...il.com,
	ziy@...dia.com,
	libang.li@...group.com,
	baolin.wang@...ux.alibaba.com,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	Lance Yang <ioworker0@...il.com>
Subject: [RFC 0/2] relax anon mTHP PTE Mapping restrictions

Hey all,

Previously, mTHP could only be mapped to PTEs where all entries were none.
With this change, PTEs within the range mapping the demand-zero page can
now be treated as `pte_none` and remapped to a new mTHP, providing more
opportunities to take advantage of mTHP.

Lance Yang (2):
  mm/mthp: add pte_range_none_or_zeropfn() helper
  mm/mthp: relax anon mTHP PTE Mapping restrictions

 mm/memory.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 49 insertions(+), 5 deletions(-)

-- 
2.45.2