linux-kernel - [PATCH v1 0/4] Fix lazy mmu mode

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Message-ID: <20250302145555.3236789-1-ryan.roberts@arm.com>
Date: Sun,  2 Mar 2025 14:55:50 +0000
From: Ryan Roberts <ryan.roberts@....com>
To: Andrew Morton <akpm@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	Andreas Larsson <andreas@...sler.com>,
	Juergen Gross <jgross@...e.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Catalin Marinas <catalin.marinas@....com>
Cc: Ryan Roberts <ryan.roberts@....com>,
	linux-mm@...ck.org,
	sparclinux@...r.kernel.org,
	xen-devel@...ts.xenproject.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 0/4] Fix lazy mmu mode

Hi All,

I'm planning to implement lazy mmu mode for arm64 to optimize vmalloc. As part
of that, I will extend lazy mmu mode to cover kernel mappings in vmalloc table
walkers. While lazy mmu mode is already used for kernel mappings in a few
places, this will extend it's use significantly.

Having reviewed the existing lazy mmu implementations in powerpc, sparc and x86,
it looks like there are a bunch of bugs, some of which may be more likely to
trigger once I extend the use of lazy mmu. So this series attempts to clarify
the requirements and fix all the bugs in advance of that series. See patch #1
commit log for all the details.

Note that I have only been able to compile test these changes so appreciate any
help in testing.

Applies on Friday's mm-unstable (5f089a9aa987), as I assume this would be
preferred via that tree.

Thanks,
Ryan

Ryan Roberts (4):
  mm: Fix lazy mmu docs and usage
  sparc/mm: Disable preemption in lazy mmu mode
  sparc/mm: Avoid calling arch_enter/leave_lazy_mmu() in set_ptes
  Revert "x86/xen: allow nesting of same lazy mode"

 arch/sparc/include/asm/pgtable_64.h   |  2 --
 arch/sparc/mm/tlb.c                   |  5 ++++-
 arch/x86/include/asm/xen/hypervisor.h | 15 ++-------------
 arch/x86/xen/enlighten_pv.c           |  1 -
 fs/proc/task_mmu.c                    | 11 ++++-------
 include/linux/pgtable.h               | 14 ++++++++------
 6 files changed, 18 insertions(+), 30 deletions(-)

--
2.43.0