linux-kernel - [PATCH v2 0/3] mm/memory_hotplug: Allow to not create firmware memmap entries

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Message-Id: <20200430102908.10107-1-david@redhat.com>
Date:   Thu, 30 Apr 2020 12:29:05 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, virtio-dev@...ts.oasis-open.org,
        virtualization@...ts.linux-foundation.org,
        linuxppc-dev@...ts.ozlabs.org, linux-acpi@...r.kernel.org,
        linux-nvdimm@...ts.01.org, linux-hyperv@...r.kernel.org,
        linux-s390@...r.kernel.org, xen-devel@...ts.xenproject.org,
        Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Baoquan He <bhe@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
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        Haiyang Zhang <haiyangz@...rosoft.com>,
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        Wei Yang <richard.weiyang@...il.com>
Subject: [PATCH v2 0/3] mm/memory_hotplug: Allow to not create firmware memmap entries

This is the follow up of [1]:
	[PATCH v1 0/3] mm/memory_hotplug: Make virtio-mem play nicely with
	kexec-tools

I realized that this is not only helpful for virtio-mem, but also for
dax/kmem - it's a fix for that use case (see patch #3) of persistent
memory.

Also, while testing, I discovered that kexec-tools will *not* add dax/kmem
memory (anything not directly under the root when parsing /proc/iomem) to
the elfcorehdr, so this memory will never get included in a dump. This
probably has to be fixed in kexec-tools - virtio-mem will require this as
well.

v1 -> v2:
- Don't change the resource name
- Rename the flag to MHP_NO_FIRMWARE_MEMMAP to reflect what it is doing
- Rephrase subjects/descriptions
- Use the flag for dax/kmem

I'll have to rebase virtio-mem on these changes, there will be a resend.

[1] https://lkml.kernel.org/r/20200429160803.109056-1-david@redhat.com

David Hildenbrand (3):
  mm/memory_hotplug: Prepare passing flags to add_memory() and friends
  mm/memory_hotplug: Introduce MHP_NO_FIRMWARE_MEMMAP
  device-dax: Add system ram (add_memory()) with MHP_NO_FIRMWARE_MEMMAP

 arch/powerpc/platforms/powernv/memtrace.c       |  2 +-
 arch/powerpc/platforms/pseries/hotplug-memory.c |  2 +-
 drivers/acpi/acpi_memhotplug.c                  |  2 +-
 drivers/base/memory.c                           |  2 +-
 drivers/dax/kmem.c                              |  3 ++-
 drivers/hv/hv_balloon.c                         |  2 +-
 drivers/s390/char/sclp_cmd.c                    |  2 +-
 drivers/xen/balloon.c                           |  2 +-
 include/linux/memory_hotplug.h                  | 15 ++++++++++++---
 mm/memory_hotplug.c                             | 14 ++++++++------
 10 files changed, 29 insertions(+), 17 deletions(-)

-- 
2.25.3