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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Stefan Hajnoczi , "Michael S. Tsirkin" , Jason Wang , Eugenio =?iso-8859-1?Q?P=E9rez?= , Xuan Zhuo , "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Bryan Tan , Vishnu Dasa , Broadcom internal kernel review list , Shuah Khan , Long Li , Jonathan Corbet , linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, netdev@vger.kernel.org, kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kselftest@vger.kernel.org, berrange@redhat.com, Sargun Dhillon , linux-doc@vger.kernel.org, Bobby Eshleman Subject: Re: [PATCH net-next v16 00/12] vsock: add namespace support to vhost-vsock and loopback Message-ID: References: <20260121-vsock-vmtest-v16-0-2859a7512097@meta.com> Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Thu, Jan 22, 2026 at 02:55:36PM +0100, Stefano Garzarella wrote: > On Wed, Jan 21, 2026 at 02:11:40PM -0800, Bobby Eshleman wrote: > > This series adds namespace support to vhost-vsock and loopback. It does > > not add namespaces to any of the other guest transports (virtio-vsock, > > hyperv, or vmci). > > > > The current revision supports two modes: local and global. Local > > mode is complete isolation of namespaces, while global mode is complete > > sharing between namespaces of CIDs (the original behavior). > > > > The mode is set using the parent namespace's > > /proc/sys/net/vsock/child_ns_mode and inherited when a new namespace is > > created. The mode of the current namespace can be queried by reading > > /proc/sys/net/vsock/ns_mode. The mode can not change after the namespace > > has been created. > > > > Modes are per-netns. This allows a system to configure namespaces > > independently (some may share CIDs, others are completely isolated). > > This also supports future possible mixed use cases, where there may be > > namespaces in global mode spinning up VMs while there are mixed mode > > namespaces that provide services to the VMs, but are not allowed to > > allocate from the global CID pool (this mode is not implemented in this > > series). > > > > Additionally, added tests for the new namespace features: > > > > tools/testing/selftests/vsock/vmtest.sh > > 1..25 > > ok 1 vm_server_host_client > > ok 2 vm_client_host_server > > ok 3 vm_loopback > > ok 4 ns_host_vsock_ns_mode_ok > > ok 5 ns_host_vsock_child_ns_mode_ok > > ok 6 ns_global_same_cid_fails > > ok 7 ns_local_same_cid_ok > > ok 8 ns_global_local_same_cid_ok > > ok 9 ns_local_global_same_cid_ok > > ok 10 ns_diff_global_host_connect_to_global_vm_ok > > ok 11 ns_diff_global_host_connect_to_local_vm_fails > > ok 12 ns_diff_global_vm_connect_to_global_host_ok > > ok 13 ns_diff_global_vm_connect_to_local_host_fails > > ok 14 ns_diff_local_host_connect_to_local_vm_fails > > ok 15 ns_diff_local_vm_connect_to_local_host_fails > > ok 16 ns_diff_global_to_local_loopback_local_fails > > ok 17 ns_diff_local_to_global_loopback_fails > > ok 18 ns_diff_local_to_local_loopback_fails > > ok 19 ns_diff_global_to_global_loopback_ok > > ok 20 ns_same_local_loopback_ok > > ok 21 ns_same_local_host_connect_to_local_vm_ok > > ok 22 ns_same_local_vm_connect_to_local_host_ok > > ok 23 ns_delete_vm_ok > > ok 24 ns_delete_host_ok > > ok 25 ns_delete_both_ok > > SUMMARY: PASS=25 SKIP=0 FAIL=0 > > > > Thanks again for everyone's help and reviews! > > Thank you for your hard work and patience! > > I think we've come up with an excellent solution that's also not too > invasive. Thanks, and I appreciate all of the work you and other maintainers put into this as well! I think we honed in on a great solution too. > > All the patches have my R-b, I've double-checked and tested this v16. > Everything seems to be working fine (famous last words xD). > > So this series is good to go IMO! > > Next step should be to update the vsock(7) namespace. Sounds good, I'll follow up with that and CC you + other reviewers that participated here. Thanks again, Bobby