linux-kernel - [PATCH v1 0/4] virtio-mem: memory unplug/offlining related cleanups

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Date:   Thu, 13 Jul 2023 16:55:47 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, virtualization@...ts.linux-foundation.org,
        David Hildenbrand <david@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Subject: [PATCH v1 0/4] virtio-mem: memory unplug/offlining related cleanups

Some cleanups+optimizations primarily around offline_and_remove_memory().

Patch #1 drops the "unsafe unplug" feature where we might get stuck in
offline_and_remove_memory() forever.

Patch #2 handles unexpected errors from offline_and_remove_memory() a bit
nicer.

Patch #3 handles the case where offline_and_remove_memory() failed and
we want to retry later to remove a completely unplugged Linux memory
block, to not have them waste memory forever.

Patch #4 something I had lying around for longer, which reacts faster
on config changes when unplugging memory.

Cc: "Michael S. Tsirkin" <mst@...hat.com>
Cc: Jason Wang <jasowang@...hat.com>
Cc: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>

David Hildenbrand (4):
  virtio-mem: remove unsafe unplug in Big Block Mode (BBM)
  virtio-mem: convert most offline_and_remove_memory() errors to -EBUSY
  virtio-mem: keep retrying on offline_and_remove_memory() errors in Sub
    Block Mode (SBM)
  virtio-mem: check if the config changed before fake offlining memory

 drivers/virtio/virtio_mem.c | 168 ++++++++++++++++++++++++------------
 1 file changed, 112 insertions(+), 56 deletions(-)

base-commit: 3f01e9fed8454dcd89727016c3e5b2fbb8f8e50c
-- 
2.41.0