linux-kernel - [PATCH v3 0/3] A Solution to Re-enable hugetlb vmemmap optimize

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]

Date: Sat, 13 Jan 2024 17:44:33 +0800
From: Nanyong Sun <sunnanyong@...wei.com>
To: <catalin.marinas@....com>, <will@...nel.org>, <mike.kravetz@...cle.com>,
	<muchun.song@...ux.dev>, <akpm@...ux-foundation.org>,
	<anshuman.khandual@....com>
CC: <willy@...radead.org>, <wangkefeng.wang@...wei.com>,
	<sunnanyong@...wei.com>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: [PATCH v3 0/3] A Solution to Re-enable hugetlb vmemmap optimize

HVO was previously disabled on arm64 [1] due to the lack of necessary
BBM(break-before-make) logic when changing page tables.
This set of patches fix this by adding necessary BBM sequence when
changing page table, and supporting vmemmap page fault handling to
fixup kernel address translation fault if vmemmap is concurrently accessed.

I have tested this patch set with concurrently accessing the vmemmap
address when do BBM and can recover by vmemmap fault handler. Also
tested under the config of 2/3/4 pgtable levels with 4K/64K page size
and all works well.

V3:
Cleanup:
Move the declarations of helper function in proper head file.

V2:
This version mainly changes some naming, and uses more appropriate helper
functions to make the code more clean, according to review comments from
Muchun Song and Kefeng Wang.

[1] commit 060a2c92d1b6 ("arm64: mm: hugetlb: Disable HUGETLB_PAGE_OPTIMIZE_VMEMMAP")

Nanyong Sun (3):
  mm: HVO: introduce helper function to update and flush pgtable
  arm64: mm: HVO: support BBM of vmemmap pgtable safely
  arm64: mm: Re-enable OPTIMIZE_HUGETLB_VMEMMAP

 arch/arm64/Kconfig                |  1 +
 arch/arm64/include/asm/esr.h      |  4 ++
 arch/arm64/include/asm/pgtable.h  |  8 ++++
 arch/arm64/include/asm/tlbflush.h | 16 +++++++
 arch/arm64/mm/fault.c             | 78 +++++++++++++++++++++++++++++--
 arch/arm64/mm/mmu.c               | 28 +++++++++++
 mm/hugetlb_vmemmap.c              | 55 +++++++++++++++++-----
 7 files changed, 175 insertions(+), 15 deletions(-)

-- 
2.25.1