Re: [PATCH 0/6] refactor RDMA live migration based on rsocket API

[Peter Xu]

On Tue, Jun 04, 2024 at 08:14:06PM +0800, Gonglei wrote:
> From: Jialin Wang <wangjialin23@huawei.com>
> 
> Hi,
> 
> This patch series attempts to refactor RDMA live migration by
> introducing a new QIOChannelRDMA class based on the rsocket API.
> 
> The /usr/include/rdma/rsocket.h provides a higher level rsocket API
> that is a 1-1 match of the normal kernel 'sockets' API, which hides the
> detail of rdma protocol into rsocket and allows us to add support for
> some modern features like multifd more easily.
> 
> Here is the previous discussion on refactoring RDMA live migration using
> the rsocket API:
> 
> https://lore.kernel.org/qemu-devel/20240328130255.52257-1-philmd@linaro.org/
> 
> We have encountered some bugs when using rsocket and plan to submit them to
> the rdma-core community.
> 
> In addition, the use of rsocket makes our programming more convenient,
> but it must be noted that this method introduces multiple memory copies,
> which can be imagined that there will be a certain performance degradation,
> hoping that friends with RDMA network cards can help verify, thank you!
> 
> Jialin Wang (6):
>   migration: remove RDMA live migration temporarily
>   io: add QIOChannelRDMA class
>   io/channel-rdma: support working in coroutine
>   tests/unit: add test-io-channel-rdma.c
>   migration: introduce new RDMA live migration
>   migration/rdma: support multifd for RDMA migration

This series has been idle for a while; we still need to know how to move
forward.  I guess I lost the latest status quo..

Any update (from anyone..) on what stage are we in?

Thanks,

-- 
Peter Xu