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    Subject[PATCH v1 15/29] virito-mem: document Sub Block Mode (SBM)
    Date
    Let's add some documentation for the current mode - Sub Block Mode (SBM) -
    to prepare for a new mode - Big Block Mode (BBM).

    Follow-up patches will properly factor out the existing Sub Block Mode
    (SBM) and implement Device Block Mode (DBM).

    Cc: "Michael S. Tsirkin" <mst@redhat.com>
    Cc: Jason Wang <jasowang@redhat.com>
    Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
    Signed-off-by: David Hildenbrand <david@redhat.com>
    ---
    drivers/virtio/virtio_mem.c | 15 +++++++++++++++
    1 file changed, 15 insertions(+)

    diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
    index faeb759687fe..fd8685673fe4 100644
    --- a/drivers/virtio/virtio_mem.c
    +++ b/drivers/virtio/virtio_mem.c
    @@ -27,6 +27,21 @@ static bool unplug_online = true;
    module_param(unplug_online, bool, 0644);
    MODULE_PARM_DESC(unplug_online, "Try to unplug online memory");

    +/*
    + * virtio-mem currently supports the following modes of operation:
    + *
    + * * Sub Block Mode (SBM): A Linux memory block spans 1..X subblocks (SB). The
    + * size of a Sub Block (SB) is determined based on the device block size, the
    + * pageblock size, and the maximum allocation granularity of the buddy.
    + * Subblocks within a Linux memory block might either be plugged or unplugged.
    + * Memory is added/removed to Linux MM in Linux memory block granularity.
    + *
    + * User space / core MM (auto onlining) is responsible for onlining added
    + * Linux memory blocks - and for selecting a zone. Linux Memory Blocks are
    + * always onlined separately, and all memory within a Linux memory block is
    + * onlined to the same zone - virtio-mem relies on this behavior.
    + */
    +
    enum virtio_mem_mb_state {
    /* Unplugged, not added to Linux. Can be reused later. */
    VIRTIO_MEM_MB_STATE_UNUSED = 0,
    --
    2.26.2
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