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Wed, 02 Sep 2026 16:01:19 -0700 (PDT) From: Bobby Eshleman Date: Wed, 02 Sep 2026 16:00:50 -0700 Subject: [PATCH net-next 4/6] selftests/vsock: add a helper to assign the g2h device to a netns Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260902-vsock-guest-ns-v1-4-9995383e9a8b@meta.com> References: <20260902-vsock-guest-ns-v1-0-9995383e9a8b@meta.com> In-Reply-To: <20260902-vsock-guest-ns-v1-0-9995383e9a8b@meta.com> To: Stefano Garzarella , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Jonathan Corbet , Shuah Khan , Stefan Hajnoczi , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?utf-8?q?Eugenio_P=C3=A9rez?= , Shuah Khan , Randy Dunlap Cc: 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 X-Mailer: b4 0.14.3 From: Bobby Eshleman No shell tool can issue IOCTL_VM_SOCKETS_ASSIGN_G2H_NETNS, so anything that wants to move the guest's vsock device from a script needs a small program to do it. It exits with the ioctl's errno so a caller can differentiate the reasons for failure. Signed-off-by: Bobby Eshleman --- tools/testing/selftests/vsock/.gitignore | 1 + tools/testing/selftests/vsock/Makefile | 3 +- .../selftests/vsock/vsock_assign_g2h_netns.c | 45 ++++++++++++++++++++++ 3 files changed, 47 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/vsock/.gitignore b/tools/testing/selftests/vsock/.gitignore index 9c5bf379480f..ffca0d9c34b1 100644 --- a/tools/testing/selftests/vsock/.gitignore +++ b/tools/testing/selftests/vsock/.gitignore @@ -1,2 +1,3 @@ vmtest.log +vsock_assign_g2h_netns vsock_test diff --git a/tools/testing/selftests/vsock/Makefile b/tools/testing/selftests/vsock/Makefile index c407c0afd938..d7170a15150f 100644 --- a/tools/testing/selftests/vsock/Makefile +++ b/tools/testing/selftests/vsock/Makefile @@ -11,7 +11,6 @@ $(OUTPUT)/vsock_test: $(VSOCK_TEST_DIR)/vsock_test $(VSOCK_TEST_DIR)/vsock_test: $(VSOCK_TEST_SRCS) $(MAKE) -C $(VSOCK_TEST_DIR) vsock_test TEST_PROGS += vmtest.sh -TEST_GEN_FILES := vsock_test +TEST_GEN_FILES := vsock_test vsock_assign_g2h_netns include ../lib.mk - diff --git a/tools/testing/selftests/vsock/vsock_assign_g2h_netns.c b/tools/testing/selftests/vsock/vsock_assign_g2h_netns.c new file mode 100644 index 000000000000..6f15629af607 --- /dev/null +++ b/tools/testing/selftests/vsock/vsock_assign_g2h_netns.c @@ -0,0 +1,45 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Assign the guest->host vsock transport, i.e. the guest's virtio-vsock + * device, to the network namespace of the invoking process. + * + * Exits with the ioctl's errno, so that callers can tell why it was refused. + * + * Copyright (c) 2026 Meta Platforms, Inc. and affiliates + */ + +#include +#include +#include +#include +#include +#include + +#include + +#ifndef IOCTL_VM_SOCKETS_ASSIGN_G2H_NETNS +#define IOCTL_VM_SOCKETS_ASSIGN_G2H_NETNS _IO(7, 0xba) +#endif + +int main(void) +{ + int fd, ret; + + fd = open("/dev/vsock", O_RDONLY); + if (fd < 0) { + fprintf(stderr, "open /dev/vsock: %s\n", strerror(errno)); + return -1; + } + + ret = ioctl(fd, IOCTL_VM_SOCKETS_ASSIGN_G2H_NETNS); + if (ret < 0) { + ret = errno; + fprintf(stderr, + "IOCTL_VM_SOCKETS_ASSIGN_G2H_NETNS: %s (errno %d)\n", + strerror(errno), errno); + } + + close(fd); + + return ret; +} -- 2.53.0-Meta