linux-kernel - [PATCH v4 0/3] mm: Fix bug affecting swapping in MTE tagged pages

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Message-Id: <20230523002518.1799481-1-pcc@google.com>
Date:   Mon, 22 May 2023 17:25:14 -0700
From:   Peter Collingbourne <pcc@...gle.com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     Peter Collingbourne <pcc@...gle.com>,
        "Qun-wei Lin (林群崴)" 
        <Qun-wei.Lin@...iatek.com>, linux-arm-kernel@...ts.infradead.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        "surenb@...gle.com" <surenb@...gle.com>,
        "david@...hat.com" <david@...hat.com>,
        "Chinwen Chang (張錦文)" 
        <chinwen.chang@...iatek.com>,
        "kasan-dev@...glegroups.com" <kasan-dev@...glegroups.com>,
        "Kuan-Ying Lee (李冠穎)" 
        <Kuan-Ying.Lee@...iatek.com>,
        "Casper Li (李中榮)" 
        <casper.li@...iatek.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        vincenzo.frascino@....com,
        Alexandru Elisei <alexandru.elisei@....com>, will@...nel.org,
        eugenis@...gle.com, Steven Price <steven.price@....com>
Subject: [PATCH v4 0/3] mm: Fix bug affecting swapping in MTE tagged pages

This patch series reworks the logic that handles swapping in page
metadata to fix a reported bug [1] where metadata can sometimes not
be swapped in correctly after commit c145e0b47c77 ("mm: streamline COW
logic in do_swap_page()").

- Patch 1 fixes the bug itself, but still requires architectures
  to restore metadata in both arch_swap_restore() and set_pte_at().

- Patch 2 makes it so that architectures only need to restore metadata
  in arch_swap_restore().

- Patch 3 changes arm64 to remove support for restoring metadata
  in set_pte_at().

[1] https://lore.kernel.org/all/5050805753ac469e8d727c797c2218a9d780d434.camel@mediatek.com/

v4:
- Rebased onto v6.4-rc3
- Reverted change to arch/arm64/mm/mteswap.c; this change was not
  valid because swapcache pages can have arch_swap_restore() called
  on them multiple times

v3:
- Added patch to call arch_swap_restore() from unuse_pte()
- Rebased onto arm64/for-next/fixes

v2:
- Call arch_swap_restore() directly instead of via arch_do_swap_page()

Peter Collingbourne (3):
  mm: Call arch_swap_restore() from do_swap_page()
  mm: Call arch_swap_restore() from unuse_pte()
  arm64: mte: Simplify swap tag restoration logic

 arch/arm64/include/asm/mte.h     |  4 ++--
 arch/arm64/include/asm/pgtable.h | 14 ++----------
 arch/arm64/kernel/mte.c          | 37 ++++++--------------------------
 mm/memory.c                      |  7 ++++++
 mm/swapfile.c                    |  7 ++++++
 5 files changed, 25 insertions(+), 44 deletions(-)

-- 
2.40.1.698.g37aff9b760-goog