linux-kernel - [PATCH v3 00/15] virtio-mem: paravirtualized memory

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Date:   Thu,  7 May 2020 12:31:04 +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, kvm@...r.kernel.org,
        Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Sebastien Boeuf <sebastien.boeuf@...el.com>,
        Samuel Ortiz <samuel.ortiz@...el.com>,
        Robert Bradford <robert.bradford@...el.com>,
        Luiz Capitulino <lcapitulino@...hat.com>,
        Pankaj Gupta <pankaj.gupta.linux@...il.com>,
        teawater <teawaterz@...ux.alibaba.com>,
        Igor Mammedov <imammedo@...hat.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Alexander Potapenko <glider@...gle.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Anthony Yznaga <anthony.yznaga@...cle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Young <dyoung@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Juergen Gross <jgross@...e.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Len Brown <lenb@...nel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Michal Hocko <mhocko@...e.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Oscar Salvador <osalvador@...e.com>,
        Oscar Salvador <osalvador@...e.de>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Pavel Tatashin <pavel.tatashin@...rosoft.com>,
        Pingfan Liu <kernelfans@...il.com>, Qian Cai <cai@....pw>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Wei Yang <richard.weiyang@...il.com>
Subject: [PATCH v3 00/15] virtio-mem: paravirtualized memory

This series is based on latest linux-next. The patches are located at:
    https://github.com/davidhildenbrand/linux.git virtio-mem-v3

Patch #1 - #10 where contained in v2 and only contain minor modifications
(mostly smaller fixes). The remaining patches are new and contain smaller
optimizations.

Details about virtio-mem can be found in the cover letter of v2 [1]. A
basic QEMU implementation was posted yesterday [2].

[1] https://lkml.kernel.org/r/20200311171422.10484-1-david@redhat.com
[2] https://lkml.kernel.org/r/20200506094948.76388-1-david@redhat.com

v2 -> v3:
- "virtio-mem: Paravirtualized memory hotplug"
-- Include "linux/slab.h" to fix build issues
-- Remember the "region_size", helpful for patch #11
-- Minor simplifaction in virtio_mem_overlaps_range()
-- Use notifier_from_errno() instead of notifier_to_errno() in notifier
-- More reliable check for added memory when unloading the driver
- "virtio-mem: Allow to specify an ACPI PXM as nid"
-- Also print the nid
- Added patch #11-#15

Cc: Sebastien Boeuf <sebastien.boeuf@...el.com>
Cc: Samuel Ortiz <samuel.ortiz@...el.com>
Cc: Robert Bradford <robert.bradford@...el.com>
Cc: Luiz Capitulino <lcapitulino@...hat.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@...il.com>
Cc: teawater <teawaterz@...ux.alibaba.com>
Cc: Igor Mammedov <imammedo@...hat.com>
Cc: Dr. David Alan Gilbert <dgilbert@...hat.com>

David Hildenbrand (15):
  virtio-mem: Paravirtualized memory hotplug
  virtio-mem: Allow to specify an ACPI PXM as nid
  virtio-mem: Paravirtualized memory hotunplug part 1
  virtio-mem: Paravirtualized memory hotunplug part 2
  mm: Allow to offline unmovable PageOffline() pages via
    MEM_GOING_OFFLINE
  virtio-mem: Allow to offline partially unplugged memory blocks
  mm/memory_hotplug: Introduce offline_and_remove_memory()
  virtio-mem: Offline and remove completely unplugged memory blocks
  virtio-mem: Better retry handling
  MAINTAINERS: Add myself as virtio-mem maintainer
  virtio-mem: Add parent resource for all added "System RAM"
  virtio-mem: Drop manual check for already present memory
  virtio-mem: Unplug subblocks right-to-left
  virtio-mem: Use -ETXTBSY as error code if the device is busy
  virtio-mem: Try to unplug the complete online memory block first

 MAINTAINERS                     |    7 +
 drivers/acpi/numa/srat.c        |    1 +
 drivers/virtio/Kconfig          |   17 +
 drivers/virtio/Makefile         |    1 +
 drivers/virtio/virtio_mem.c     | 1962 +++++++++++++++++++++++++++++++
 include/linux/memory_hotplug.h  |    1 +
 include/linux/page-flags.h      |   10 +
 include/uapi/linux/virtio_ids.h |    1 +
 include/uapi/linux/virtio_mem.h |  208 ++++
 mm/memory_hotplug.c             |   81 +-
 mm/page_alloc.c                 |   26 +
 mm/page_isolation.c             |    9 +
 12 files changed, 2314 insertions(+), 10 deletions(-)
 create mode 100644 drivers/virtio/virtio_mem.c
 create mode 100644 include/uapi/linux/virtio_mem.h

-- 
2.25.3