netdev - Re: [PATCH RFC 0/2] vsock/virtio: fix issues on device hot-unplug

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Date:   Fri, 4 Jan 2019 11:44:47 +0000
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH RFC 0/2] vsock/virtio: fix issues on device hot-unplug

On Thu, Dec 20, 2018 at 01:15:33PM +0100, Stefano Garzarella wrote:
> These patches try to handle the hot-unplug of vsock virtio transport device in
> a proper way.
> 
> Maybe move the vsock_core_init()/vsock_core_exit() functions in the module_init
> and module_exit of vsock_virtio_transport module can't be the best way, but the
> architecture of vsock_core forces us to this approach for now.
> 
> The vsock_core proto_ops expect a valid pointer to the transport device, so we
> can't call vsock_core_exit() until there are open sockets.
> 
> Another (little more complex) approach during the device removal, could be to
> unregister the AF_VSOCK protocol, then reset all sockets and wait for their
> destruction. At this point, we can set the transport pointer to NULL.
> 
> Any suggestions would be helpful.
> 
> Stefano Garzarella (2):
>   vsock/virtio: fix kernel panic after device hot-unplug
>   vsock/virtio: reset connected sockets on device removal
> 
>  net/vmw_vsock/virtio_transport.c | 29 +++++++++++++++++++++--------
>  1 file changed, 21 insertions(+), 8 deletions(-)
> 
> -- 
> 2.19.2
> 

Fine in the current model.  Once we tackle nested virtualization
(two transports at once) we'll have to revisit this.

Acked-by: Stefan Hajnoczi <stefanha@...hat.com>

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