[Virtio-fs] [PATCH v3 4/5] vhost: Add high-level state save/load functions

[Stefan Hajnoczi]

On Fri, Sep 15, 2023 at 12:25:29PM +0200, Hanna Czenczek wrote:
> vhost_save_backend_state() and vhost_load_backend_state() can be used by
> vhost front-ends to easily save and load the back-end's state to/from
> the migration stream.
> 
> Because we do not know the full state size ahead of time,
> vhost_save_backend_state() simply reads the data in 1 MB chunks, and
> writes each chunk consecutively into the migration stream, prefixed by
> its length.  EOF is indicated by a 0-length chunk.
> 
> Signed-off-by: Hanna Czenczek <hreitz at redhat.com>
> ---
>  include/hw/virtio/vhost.h |  35 +++++++
>  hw/virtio/vhost.c         | 204 ++++++++++++++++++++++++++++++++++++++
>  2 files changed, 239 insertions(+)

Reviewed-by: Stefan Hajnoczi <stefanha at redhat.com>
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