linux-kernel - Re: [PATCH net-next 0/6] vsock: add local transport support

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Message-ID: <20191121094643.GD439743@stefanha-x1.localdomain>
Date:   Thu, 21 Nov 2019 09:46:43 +0000
From:   Stefan Hajnoczi <stefanha@...il.com>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        Dexuan Cui <decui@...rosoft.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Jorgen Hansen <jhansen@...are.com>
Subject: Re: [PATCH net-next 0/6] vsock: add local transport support

On Tue, Nov 19, 2019 at 12:01:15PM +0100, Stefano Garzarella wrote:
> This series introduces a new transport (vsock_loopback) to handle
> local communication.
> This could be useful to test vsock core itself and to allow developers
> to test their applications without launching a VM.
> 
> Before this series, vmci and virtio transports allowed this behavior,
> but only in the guest.
> We are moving the loopback handling in a new transport, because it
> might be useful to provide this feature also in the host or when
> no H2G/G2H transports (hyperv, virtio, vmci) are loaded.
> 
> The user can use the loopback with the new VMADDR_CID_LOCAL (that
> replaces VMADDR_CID_RESERVED) in any condition.
> Otherwise, if the G2H transport is loaded, it can also use the guest
> local CID as previously supported by vmci and virtio transports.
> If G2H transport is not loaded, the user can also use VMADDR_CID_HOST
> for local communication.
> 
> Patch 1 is a cleanup to build virtio_transport_common without virtio
> Patch 2 adds the new VMADDR_CID_LOCAL, replacing VMADDR_CID_RESERVED
> Patch 3 adds a new feature flag to register a loopback transport
> Patch 4 adds the new vsock_loopback transport based on the loopback
>         implementation of virtio_transport
> Patch 5 implements the logic to use the local transport for loopback
>         communication
> Patch 6 removes the loopback from virtio_transport
> 
> @Jorgen: Do you think it might be a problem to replace
> VMADDR_CID_RESERVED with VMADDR_CID_LOCAL?
> 
> Thanks,
> Stefano
> 
> Stefano Garzarella (6):
>   vsock/virtio_transport_common: remove unused virtio header includes
>   vsock: add VMADDR_CID_LOCAL definition
>   vsock: add local transport support in the vsock core
>   vsock: add vsock_loopback transport
>   vsock: use local transport when it is loaded
>   vsock/virtio: remove loopback handling
> 
>  MAINTAINERS                             |   1 +
>  include/net/af_vsock.h                  |   2 +
>  include/uapi/linux/vm_sockets.h         |   8 +-
>  net/vmw_vsock/Kconfig                   |  12 ++
>  net/vmw_vsock/Makefile                  |   1 +
>  net/vmw_vsock/af_vsock.c                |  49 +++++-
>  net/vmw_vsock/virtio_transport.c        |  61 +------
>  net/vmw_vsock/virtio_transport_common.c |   3 -
>  net/vmw_vsock/vmci_transport.c          |   2 +-
>  net/vmw_vsock/vsock_loopback.c          | 217 ++++++++++++++++++++++++
>  10 files changed, 283 insertions(+), 73 deletions(-)
>  create mode 100644 net/vmw_vsock/vsock_loopback.c

Please see my comments.  Otherwise:

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

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