linux-kernel - [PATCH v3 0/3] arm64: tlb: Fix TLBI RANGE operand

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Date: Fri,  5 Apr 2024 13:58:49 +1000
From: Gavin Shan <gshan@...hat.com>
To: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: catalin.marinas@....com,
	will@...nel.org,
	gshan@...hat.com,
	akpm@...ux-foundation.org,
	maz@...nel.org,
	oliver.upton@...ux.dev,
	ryan.roberts@....com,
	apopple@...dia.com,
	rananta@...gle.com,
	mark.rutland@....com,
	v-songbaohua@...o.com,
	yangyicong@...ilicon.com,
	shahuang@...hat.com,
	yihyu@...hat.com,
	shan.gavin@...il.com
Subject: [PATCH v3 0/3] arm64: tlb: Fix TLBI RANGE operand

A kernel crash on the destination VM after the live migration was
reported by Yihuang Yu. The issue is only reproducible on NVidia's
grace-hopper where TLBI RANGE feature is available. The kernel crash
is caused by incomplete TLB flush and missed dirty page. For the
root cause and analysis, please refer to PATCH[v3 1/3]'s commit log.

Thanks to Marc Zyngier who proposed all the code changes.

PATCH[1] fixes the kernel crash by extending __TLBI_RANGE_NUM() so that
         the TLBI RANGE on the area with MAX_TLBI_RANGE_PAGES pages can
         be supported
PATCH[2] improves __TLBI_VADDR_RANGE() with masks and FIELD_PREP()
PATCH[3] allows TLBI RANGE operation on the area with MAX_TLBI_RANGE_PAGES
         pages in __flush_tlb_range_nosync()

v2: https://lists.infradead.org/pipermail/linux-arm-kernel/2024-April/917432.html
v1: https://lists.infradead.org/pipermail/linux-arm-kernel/2024-April/916972.html

Changelog
=========
v3:
  Improve __TLBI_RANGE_NUM() and its comments. Added patches
  to improve __TLBI_VADDR_RANGE() and __flush_tlb_range_nosync() (Marc) 
v2:
  Improve __TLBI_RANGE_NUM()                                     (Marc)

Gavin Shan (3):
  arm64: tlb: Fix TLBI RANGE operand
  arm64: tlb: Improve __TLBI_VADDR_RANGE()
  arm64: tlb: Allow range operation for MAX_TLBI_RANGE_PAGES

 arch/arm64/include/asm/tlbflush.h | 53 ++++++++++++++++++-------------
 1 file changed, 31 insertions(+), 22 deletions(-)

-- 
2.44.0