linux-kernel - [PATCH v1 0/4] mm/memory

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Message-Id: <20210927150518.8607-1-david@redhat.com>
Date:   Mon, 27 Sep 2021 17:05:14 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...nel.org>,
        Michal Hocko <mhocko@...e.com>,
        Oscar Salvador <osalvador@...e.de>,
        Jianyong Wu <Jianyong.Wu@....com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Vineet Gupta <vgupta@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Huacai Chen <chenhuacai@...nel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Arnd Bergmann <arnd@...db.de>,
        linux-snps-arc@...ts.infradead.org, linux-ia64@...r.kernel.org,
        linux-m68k@...ts.linux-m68k.org, linux-mips@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-mm@...ck.org,
        kexec@...ts.infradead.org
Subject: [PATCH v1 0/4] mm/memory_hotplug: full support for

Architectures that require CONFIG_ARCH_KEEP_MEMBLOCK=y, such as arm64,
don't cleanly support add_memory_driver_managed() yet. Most prominently,
kexec_file can still end up placing images on such driver-managed memory,
resulting in undesired behavior.

Teaching kexec to not place images on driver-managed memory is especially
relevant for virtio-mem. Details can be found in commit 7b7b27214bba
("mm/memory_hotplug: introduce add_memory_driver_managed()").

Extend memblock with a new flag and set it from memory hotplug code
when applicable. This is required to fully support virtio-mem on
arm64, making also kexec_file behave like on x86-64.

Alternative A: Extend kexec_walk_memblock() to consult the kernel resource
tree whether IORESOURCE_SYSRAM_DRIVER_MANAGED is set. This feels wrong,
because the goal was to rely on memblock and not the resource tree.

Alternative B: Reuse MEMBLOCK_HOTPLUG. MEMBLOCK_HOTPLUG serves a different
purpose, though.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Mike Rapoport <rppt@...nel.org>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Oscar Salvador <osalvador@...e.de>
Cc: Jianyong Wu <Jianyong.Wu@....com>
Cc: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
Cc: Vineet Gupta <vgupta@...nel.org>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Huacai Chen <chenhuacai@...nel.org>
Cc: Jiaxun Yang <jiaxun.yang@...goat.com>
Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: Heiko Carstens <hca@...ux.ibm.com>
Cc: Vasily Gorbik <gor@...ux.ibm.com>
Cc: Christian Borntraeger <borntraeger@...ibm.com>
Cc: Eric Biederman <ebiederm@...ssion.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: linux-snps-arc@...ts.infradead.org
Cc: linux-ia64@...r.kernel.org
Cc: linux-m68k@...ts.linux-m68k.org
Cc: linux-mips@...r.kernel.org
Cc: linux-s390@...r.kernel.org
Cc: linux-mm@...ck.org
Cc: kexec@...ts.infradead.org

David Hildenbrand (4):
  mm/memory_hotplug: handle memblock_add_node() failures in
    add_memory_resource()
  memblock: allow to specify flags with memblock_add_node()
  memblock: add MEMBLOCK_DRIVER_MANAGED to mimic
    IORESOURCE_SYSRAM_DRIVER_MANAGED
  mm/memory_hotplug: indicate MEMBLOCK_DRIVER_MANAGED with
    IORESOURCE_SYSRAM_DRIVER_MANAGED

 arch/arc/mm/init.c               |  4 ++--
 arch/ia64/mm/contig.c            |  2 +-
 arch/ia64/mm/init.c              |  2 +-
 arch/m68k/mm/mcfmmu.c            |  3 ++-
 arch/m68k/mm/motorola.c          |  6 ++++--
 arch/mips/loongson64/init.c      |  4 +++-
 arch/mips/sgi-ip27/ip27-memory.c |  3 ++-
 arch/s390/kernel/setup.c         |  3 ++-
 include/linux/memblock.h         | 19 ++++++++++++++++---
 include/linux/mm.h               |  2 +-
 kernel/kexec_file.c              |  5 +++++
 mm/memblock.c                    | 13 +++++++++----
 mm/memory_hotplug.c              | 11 +++++++++--
 13 files changed, 57 insertions(+), 20 deletions(-)


base-commit: 5816b3e6577eaa676ceb00a848f0fd65fe2adc29
-- 
2.31.1