linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: "Michael S. Tsirkin" <mst@redhat.com>
To: fuguancheng <fuguancheng@bytedance.com>
Cc: jasowang@redhat.com, stefanha@redhat.com, sgarzare@redhat.com,
	davem@davemloft.net, kuba@kernel.org,
	arseny.krasnov@kaspersky.com, andraprs@amazon.com,
	colin.king@canonical.com, kvm@vger.kernel.org,
	virtualization@lists.linux-foundation.org,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/4] Add multi-cid support for vsock driver
Date: Mon, 2 Aug 2021 16:21:36 -0400	[thread overview]
Message-ID: <20210802162038-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <20210802120720.547894-1-fuguancheng@bytedance.com>

On Mon, Aug 02, 2021 at 08:07:16PM +0800, fuguancheng wrote:
> This patchset enables the user to specify additional CIDS for host and
> guest when booting up the guest machine. The guest's additional CIDS cannot
> be repeated, and can be used to communicate with the host. The user can
> also choose to specify a set of additional host cids, which can be
> used to communicate with the guest who specify them. The original
> CID(VHOST_DEFAULT_CID) is still available for host. The guest cid field is
> deleted.
> 
> To ensure that multiple guest CID maps to the same vhost_vsock struct,
> a struct called vhost_vsock_ref is added.  The function of vhost_vsock_ref
> is simply used to allow multiple guest CIDS map to the
> same vhost_vsock struct.
> 
> If not specified, the host and guest will now use the first CID specified
> in the array for connect operation. If the host or guest wants to use
> one specific CID, the bind operation can be performed before the connect
> operation so that the vsock_auto_bind operation can be avoided.
> 
> Hypervisors such as qemu needs to be modified to use this feature. The
> required changes including at least the following:
> 1. Invoke the modified ioctl call with the request code
> VHOST_VSOCK_SET_GUEST_CID. Also see struct multi_cid_message for
> arguments used in this ioctl call.
> 2. Write new arguments to the emulated device config space.
> 3. Modify the layout of the data written to the device config space.
> See struct virtio_vsock_config for reference.
> 
> I have tested this setup with iperf3.  The communication between host
> and guest using original CID or additional CIDS worked normally.
> Not tested in extreme conditions where memory is insufficient.
> 
> Linux kernel newbies here, any suggestions are welcomed.
> Thanks in advance!

Could you supply a bit info about the motivation for this feature?
I wonder whether it's be better to have multiple VQs
instead of tweaking the CID in the message header.


> fuguancheng (4):
>   VSOCK DRIVER: Add multi-cid support for guest
>   VSOCK DRIVER: support communication using additional guest cid
>   VSOCK DRIVER: support specifying additional cids for host
>   VSOCK DRIVER: support communication using host additional cids
> 
>  drivers/vhost/vsock.c                   | 338 ++++++++++++++++++++++++++++----
>  include/net/af_vsock.h                  |   5 +
>  include/uapi/linux/vhost.h              |   9 +
>  include/uapi/linux/virtio_vsock.h       |   8 +-
>  net/vmw_vsock/af_vsock.c                |  28 ++-
>  net/vmw_vsock/virtio_transport.c        | 129 +++++++++++-
>  net/vmw_vsock/virtio_transport_common.c |   5 +-
>  net/vmw_vsock/vsock_loopback.c          |   8 +
>  8 files changed, 471 insertions(+), 59 deletions(-)
> 
> -- 
> 2.11.0
> 
> 


      parent reply	other threads:[~2021-08-02 20:21 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-02 12:07 fuguancheng
2021-08-02 12:07 ` [PATCH 1/4] VSOCK DRIVER: Add multi-cid support for guest fuguancheng
2021-08-02 20:10   ` Michael S. Tsirkin
2021-08-02 20:11   ` Michael S. Tsirkin
2021-08-02 20:20   ` Michael S. Tsirkin
2021-08-02 12:07 ` [PATCH 2/4] VSOCK DRIVER: support communication using additional guest cid fuguancheng
2021-08-02 20:13   ` Michael S. Tsirkin
2021-08-02 12:07 ` [PATCH 3/4] VSOCK DRIVER: support specifying additional cids for host fuguancheng
2021-08-02 12:07 ` [PATCH 4/4] VSOCK DRIVER: support communication using host additional cids fuguancheng
2021-08-02 13:42 ` [PATCH 0/4] Add multi-cid support for vsock driver Stefano Garzarella
     [not found]   ` <CAKv9dH5KbN25m8_Wmej9WXgJWheRV5S-tyPCdjUHHEFoWk-V1w@mail.gmail.com>
2021-08-04 15:23     ` [External] " Stefano Garzarella
2021-08-02 20:21 ` Michael S. Tsirkin [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210802162038-mutt-send-email-mst@kernel.org \
    --to=mst@redhat.com \
    --cc=andraprs@amazon.com \
    --cc=arseny.krasnov@kaspersky.com \
    --cc=colin.king@canonical.com \
    --cc=davem@davemloft.net \
    --cc=fuguancheng@bytedance.com \
    --cc=jasowang@redhat.com \
    --cc=kuba@kernel.org \
    --cc=kvm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=netdev@vger.kernel.org \
    --cc=sgarzare@redhat.com \
    --cc=stefanha@redhat.com \
    --cc=virtualization@lists.linux-foundation.org \
    --subject='Re: [PATCH 0/4] Add multi-cid support for vsock driver' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).