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[79.53.30.11]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4870bf3494dsm6691205f8f.28.2026.09.16.05.44.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Sep 2026 05:44:38 -0700 (PDT) Date: Wed, 16 Sep 2026 14:44:28 +0200 From: Stefano Garzarella To: Bobby Eshleman Cc: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Jonathan Corbet , Shuah Khan , Stefan Hajnoczi , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , Eugenio =?utf-8?B?UMOpcmV6?= , Shuah Khan , Randy Dunlap , virtualization@lists.linux.dev, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, sargun@sargun.me, jlinbox@meta.com, Bobby Eshleman Subject: Re: [PATCH net-next 3/6] vsock/virtio: support guest device network namespace Message-ID: References: <20260902-vsock-guest-ns-v1-0-9995383e9a8b@meta.com> <20260902-vsock-guest-ns-v1-3-9995383e9a8b@meta.com> Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: HE76IjVWFA-CSO4YxHMXBwOa0nzEjBJbTwwwe0ca_DM_1789562680 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline On Tue, Sep 15, 2026 at 11:14:47AM -0700, Bobby Eshleman wrote: >On Tue, Sep 15, 2026 at 05:47:02PM +0200, Stefano Garzarella wrote: >> On Wed, Sep 02, 2026 at 04:00:49PM -0700, Bobby Eshleman wrote: >> > From: Bobby Eshleman >> > >> > virtio-vsock did not have namespace support (the device was always >> > accessible to any global namespace). >> > >> > Make the virtio-vsock device assignable to a namespace and initialize it >> > to init_net. Because virtio-vsock and init_net are both hardcoded to >> > global mode, nothing changes until the assign ioctl is issued. >> > >> > When the device's local-mode namespace is being destroyed, received >> > packets are reset until new valid a namespace has been assigned and/or >> > automatically returned to, and the next RX batch begins (in >> > virtio_transport_rx_work). They are reset rather than dropped because >> > vsock does not retransmit, so a silent drop would leave the host waiting >> > for a timeout, and a connection request arriving in that window has no >> > socket whose teardown would tell it otherwise. This requires making >> > virtio_transport_reset_no_sock() available outside of the common code. >> > >> > When a device is assigned to a namespace, every already established >> > vsock socket that is no longer able to reach the device is forcibly >> > reset. For that reason, adding new sockets to the connected table must >> > be performed atomically with regards to namespace assignment. This >> > ensures that when the socket is added to the connected table that it >> > actually passes the new reachability conditions set by ns assignment. If >> > it wins the race to the table and does NOT pass the reachability tests, >> > then the reset sweep will correctly catch it. This is the purpose >> > of the new helper 'vsock_maybe_set_connected()'. >> > >> > Signed-off-by: Bobby Eshleman >> > --- >> > include/linux/virtio_vsock.h | 2 ++ >> > net/vmw_vsock/virtio_transport.c | 28 ++++++++++++++++++++++------ >> > net/vmw_vsock/virtio_transport_common.c | 28 +++++++++++++++++++++------- >> > 3 files changed, 45 insertions(+), 13 deletions(-) >> > >> > diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h >> > index f91704731057..9c68ce1d7fb4 100644 >> > --- a/include/linux/virtio_vsock.h >> > +++ b/include/linux/virtio_vsock.h >> > @@ -286,6 +286,8 @@ void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct sk_buff * >> > u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 wanted); >> > void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit); >> > void virtio_transport_deliver_tap_pkt(struct sk_buff *skb); >> > +int virtio_transport_reset_no_sock(const struct virtio_transport *t, >> > + struct sk_buff *skb, struct net *net); >> > int virtio_transport_purge_skbs(void *vsk, struct sk_buff_head *list); >> > int virtio_transport_read_skb(struct vsock_sock *vsk, skb_read_actor_t read_actor); >> > int virtio_transport_notify_set_rcvlowat(struct vsock_sock *vsk, int val); >> > diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c >> > index 4f9aa9c4c3aa..a453a4f828dc 100644 >> > --- a/net/vmw_vsock/virtio_transport.c >> > +++ b/net/vmw_vsock/virtio_transport.c >> > @@ -540,9 +540,14 @@ static bool virtio_transport_msgzerocopy_allow(void) >> > return true; >> > } >> > >> > +static bool virtio_transport_netns_assign_allow(void) >> > +{ >> > + return true; >> > +} >> > + >> > bool virtio_transport_stream_allow(struct vsock_sock *vsk, u32 cid, u32 port) >> > { >> > - return vsock_net_mode_global(vsk); >> > + return vsock_g2h_net_reachable(sock_net(sk_vsock(vsk))); >> > } >> > >> > static bool virtio_transport_seqpacket_allow(struct vsock_sock *vsk, >> > @@ -587,6 +592,7 @@ static struct virtio_transport virtio_transport = { >> > .seqpacket_has_data = virtio_transport_seqpacket_has_data, >> > >> > .msgzerocopy_allow = virtio_transport_msgzerocopy_allow, >> > + .netns_assign_allow = virtio_transport_netns_assign_allow, >> > >> > .notify_poll_in = virtio_transport_notify_poll_in, >> > .notify_poll_out = virtio_transport_notify_poll_out, >> > @@ -616,7 +622,7 @@ virtio_transport_seqpacket_allow(struct vsock_sock *vsk, u32 remote_cid) >> > struct virtio_vsock *vsock; >> > bool seqpacket_allow; >> > >> > - if (!vsock_net_mode_global(vsk)) >> > + if (!vsock_g2h_net_reachable(sock_net(sk_vsock(vsk)))) >> > return false; >> > >> > seqpacket_allow = false; >> > @@ -634,6 +640,9 @@ static void virtio_transport_rx_work(struct work_struct *work) >> > struct virtio_vsock *vsock = >> > container_of(work, struct virtio_vsock, rx_work); >> > struct virtqueue *vq; >> > + struct net *net; >> > + >> > + net = vsock_g2h_net_get(); >> > >> > mutex_lock(&vsock->rx_lock); >> > >> > @@ -682,10 +691,14 @@ static void virtio_transport_rx_work(struct work_struct *work) >> > >> > virtio_transport_deliver_tap_pkt(skb); >> > >> > - /* Force virtio-transport into global mode since it >> > - * does not yet support local-mode namespacing. >> > - */ >> > - virtio_transport_recv_pkt(&virtio_transport, skb, NULL); >> > + if (unlikely(!net)) { >> > + virtio_transport_reset_no_sock( >> > + &virtio_transport, skb, &init_net); >> >> Why init_net? > >This parameter is actually unused by virtio_transport_reset_no_sock(), >its call to virtio_transport_send_pkt(), and even the eventual call to >virtio_transport_deliver_tap_pkt()... so maybe NULL w/ a comment would >be better? mmm, should we remove that parameter if unused? Anyway, not in this series/patch. Here, anything is fine, just put a comment with the reason. Thanks, Stefano