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

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Date: Wed, 10 Apr 2024 16:43:53 +0800
From: Shaoqin Huang <shahuang@...hat.com>
To: Gavin Shan <gshan@...hat.com>, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Cc: catalin.marinas@....com, will@...nel.org, 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, yihyu@...hat.com,
 shan.gavin@...il.com
Subject: Re: [PATCH v3 0/3] arm64: tlb: Fix TLBI RANGE operand



On 4/5/24 11:58, Gavin Shan wrote:
> 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(-)
> 

For the series.

Reviewed-by: Shaoqin Huang <shahuang@...hat.com>

-- 
Shaoqin