[PATCH v1 0/4] virtio-mem: Support "x-ignore-shared" migration

[David Hildenbrand <david@redhat.com>]

Stumbling over "x-ignore-shared" migration support for virtio-mem on
my todo list, I remember talking to Dave G. a while ago about how
ram_block_discard_range() in MAP_PIRVATE file mappings is possibly
harmful when the file is used somewhere else -- for example, with VM
templating in multiple VMs.

This series adds a warning to ram_block_discard_range() in that problematic
case and adds "x-ignore-shared" migration support for virtio-mem, which
is pretty straight-forward. The last patch also documents how VM templating
interacts with virtio-mem.

Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Juan Quintela <quintela@redhat.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Leonardo Bras <leobras@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Philippe Mathieu-Daudé" <philmd@linaro.org>
Cc: Peng Tao <tao.peng@linux.alibaba.com>

David Hildenbrand (4):
  softmmu/physmem: Warn with ram_block_discard_range() on MAP_PRIVATE
    file mapping
  virtio-mem: Skip most of virtio_mem_unplug_all() without plugged
    memory
  migration/ram: Expose ramblock_is_ignored() as
    migrate_ram_is_ignored()
  virtio-mem: Support "x-ignore-shared" migration

 hw/virtio/virtio-mem.c   | 67 ++++++++++++++++++++++++++++------------
 include/migration/misc.h |  1 +
 migration/postcopy-ram.c |  2 +-
 migration/ram.c          | 14 ++++-----
 migration/ram.h          |  3 +-
 softmmu/physmem.c        | 18 +++++++++++
 6 files changed, 76 insertions(+), 29 deletions(-)

-- 
2.40.1