Re: [PATCH net-next v3] selftests/vsock: add initial vmtest.sh for vsock

On Mon, Apr 28, 2025 at 04:48:11PM -0700, Bobby Eshleman wrote:

This commit introduces a new vmtest.sh runner for vsock.

It uses virtme-ng/qemu to run tests in a VM. The tests validate G2H, H2G, and loopback. The testing tools from tools/testing/vsock/ are reused. Currently, only vsock_test is used.

VMCI and hyperv support is automatically built, though not used.

Only tested on x86.

To run:

$ tools/testing/selftests/vsock/vmtest.sh

I tried and it's working, but I have a lot of these messages in the output: dmesg: read kernel buffer failed: Operation not permitted

I'm on Fedora 41:

$ uname -r 6.14.4-200.fc41.x86_64

or

$ make -C tools/testing/selftests TARGETS=vsock run_tests

Results: # linux/tools/testing/selftests/vsock/vmtest.log setup: Building kernel and tests setup: Booting up VM setup: VM booted up test:vm_server_host_client:guest: Control socket listening on 0.0.0.0:51000 test:vm_server_host_client:guest: Control socket connection accepted... [...] test:vm_loopback:guest: 30 - SOCK_STREAM retry failed connect()...ok test:vm_loopback:guest: 31 - SOCK_STREAM SO_LINGER null-ptr-deref...ok test:vm_loopback:guest: 31 - SOCK_STREAM SO_LINGER null-ptr-deref...ok

Future work can include vsock_diag_test.

vmtest.sh is loosely based off of tools/testing/selftests/net/pmtu.sh, which was picked out of the bag of tests I knew to work with NIPA.

Because vsock requires a VM to test anything other than loopback, this patch adds vmtest.sh as a kselftest itself. This is different than other systems that have a "vmtest.sh", where it is used as a utility script to spin up a VM to run the selftests as a guest (but isn't hooked into kselftest). This aspect is worth review, as I'm not aware of all of the enviroments where this would run.

Yeah, an opinion from net maintainers on this would be great.

Signed-off-by: Bobby Eshleman bobbyeshleman@gmail.com

Changes in v3:

• use common conditional syntax for checking variables
• use return value instead of global rc
• fix typo TEST_HOST_LISTENER_PORT -> TEST_HOST_PORT_LISTENER
• use SIGTERM instead of SIGKILL on cleanup
• use peer-cid=1 for loopback
• change sleep delay times into globals
• fix test_vm_loopback logging
• add test selection in arguments
• make QEMU an argument
• check that vng binary is on path
• use QEMU variable
• change <tab><backslash> to <space><backslash>
• fix hardcoded file paths
• add comment in commit msg about script that vmtest.sh was based off of
• Add tools/testing/selftest/vsock/Makefile for kselftest
• Link to v2: https://lore.kernel.org/r/20250417-vsock-vmtest-v2-1-3901a27331e8@gmail.com

Changes in v2:

• add kernel oops and warnings checker
• change testname variable to use FUNCNAME
• fix spacing in test_vm_server_host_client
• add -s skip build option to vmtest.sh
• add test_vm_loopback
• pass port to vm_wait_for_listener
• fix indentation in vmtest.sh
• add vmci and hyperv to config
• changed whitespace from tabs to spaces in help string
• Link to v1: https://lore.kernel.org/r/20250410-vsock-vmtest-v1-1-f35a81dab98c@gmail.com

---

MAINTAINERS | 1 + tools/testing/selftests/vsock/.gitignore | 1 + tools/testing/selftests/vsock/Makefile | 9 + tools/testing/selftests/vsock/config.vsock | 10 + tools/testing/selftests/vsock/settings | 1 + tools/testing/selftests/vsock/vmtest.sh | 354 +++++++++++++++++++++++++++++ 6 files changed, 376 insertions(+)

While applying git warned about trailing spaces, but also checkpatch is warning about them, please can you fix at least the errors (and maybe the misspelling):

$ ./scripts/checkpatch.pl --strict -g master..HEAD --codespell WARNING: Prefer a maximum 75 chars per line (possible unwrapped commit description?) #31: test:vm_server_host_client:guest: Control socket listening on 0.0.0.0:51000

WARNING: 'enviroments' may be misspelled - perhaps 'environments'? #48: enviroments where this would run. ^^^^^^^^^^^

ERROR: trailing whitespace #174: FILE: tools/testing/selftests/vsock/vmtest.sh:47: +^Ivm_server_host_client^IRun vsock_test in server mode on the VM and in client mode on the host.^I$

WARNING: line length of 104 exceeds 100 columns #174: FILE: tools/testing/selftests/vsock/vmtest.sh:47: + vm_server_host_client Run vsock_test in server mode on the VM and in client mode on the host.

ERROR: trailing whitespace #175: FILE: tools/testing/selftests/vsock/vmtest.sh:48: +^Ivm_client_host_server^IRun vsock_test in client mode on the VM and in server mode on the host.^I$

WARNING: line length of 104 exceeds 100 columns #175: FILE: tools/testing/selftests/vsock/vmtest.sh:48: + vm_client_host_server Run vsock_test in client mode on the VM and in server mode on the host.

ERROR: trailing whitespace #176: FILE: tools/testing/selftests/vsock/vmtest.sh:49: +^Ivm_loopback^I^IRun vsock_test using the loopback transport in the VM.^I$

ERROR: trailing whitespace #443: FILE: tools/testing/selftests/vsock/vmtest.sh:316: +IFS="^I$

total: 4 errors, 4 warnings, 0 checks, 382 lines checked

NOTE: For some of the reported defects, checkpatch may be able to mechanically convert to the typical style using --fix or --fix-inplace.

NOTE: Whitespace errors detected. You may wish to use scripts/cleanpatch or scripts/cleanfile

Commit ffa17d673263 ("selftests/vsock: add initial vmtest.sh for vsock") has style problems, please review.

NOTE: If any of the errors are false positives, please report them to the maintainer, see CHECKPATCH in MAINTAINERS.

diff --git a/MAINTAINERS b/MAINTAINERS index 657a67f9031ef7798c19ac63e6383d4cb18a9e1f..3fbdd7bbfce7196a3cc7db70203317c6bd0e51fd 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -25751,6 +25751,7 @@ F: include/uapi/linux/vm_sockets.h F: include/uapi/linux/vm_sockets_diag.h F: include/uapi/linux/vsockmon.h F: net/vmw_vsock/ +F: tools/testing/selftests/vsock/ F: tools/testing/vsock/

VMALLOC diff --git a/tools/testing/selftests/vsock/.gitignore b/tools/testing/selftests/vsock/.gitignore new file mode 100644 index 0000000000000000000000000000000000000000..1950aa8ac68c0831c12c1aaa429da45bbe41e60f --- /dev/null +++ b/tools/testing/selftests/vsock/.gitignore @@ -0,0 +1 @@ +vsock_selftests.log diff --git a/tools/testing/selftests/vsock/Makefile b/tools/testing/selftests/vsock/Makefile new file mode 100644 index 0000000000000000000000000000000000000000..6fded8c4d593541a6f7462147bffcb719def378f --- /dev/null +++ b/tools/testing/selftests/vsock/Makefile @@ -0,0 +1,9 @@ +# SPDX-License-Identifier: GPL-2.0 +.PHONY: all +all:

+TEST_PROGS := vmtest.sh +EXTRA_CLEAN := vmtest.log

+include ../lib.mk

diff --git a/tools/testing/selftests/vsock/config.vsock b/tools/testing/selftests/vsock/config.vsock new file mode 100644 index 0000000000000000000000000000000000000000..9e0fb2270e6a2fc0beb5f0d9f0bc37158d0a9d23 --- /dev/null +++ b/tools/testing/selftests/vsock/config.vsock @@ -0,0 +1,10 @@ +CONFIG_VSOCKETS=y +CONFIG_VSOCKETS_DIAG=y +CONFIG_VSOCKETS_LOOPBACK=y +CONFIG_VMWARE_VMCI_VSOCKETS=y +CONFIG_VIRTIO_VSOCKETS=y +CONFIG_VIRTIO_VSOCKETS_COMMON=y +CONFIG_HYPERV_VSOCKETS=y +CONFIG_VMWARE_VMCI=y +CONFIG_VHOST_VSOCK=y +CONFIG_HYPERV=y diff --git a/tools/testing/selftests/vsock/settings b/tools/testing/selftests/vsock/settings new file mode 100644 index 0000000000000000000000000000000000000000..e7b9417537fbc4626153b72e8f295ab4594c844b --- /dev/null +++ b/tools/testing/selftests/vsock/settings @@ -0,0 +1 @@ +timeout=0 diff --git a/tools/testing/selftests/vsock/vmtest.sh b/tools/testing/selftests/vsock/vmtest.sh new file mode 100755 index 0000000000000000000000000000000000000000..d70b9446e531d6d20beb24ddeda2cf0a9f7e9a39 --- /dev/null +++ b/tools/testing/selftests/vsock/vmtest.sh @@ -0,0 +1,354 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 +# +# Copyright (c) 2025 Meta Platforms, Inc. and affiliates +# +# Dependencies: +# * virtme-ng +# * busybox-static (used by virtme-ng) +# * qemu (used by virtme-ng)

+SCRIPT_DIR="$(cd -P -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd -P)" +KERNEL_CHECKOUT=$(realpath ${SCRIPT_DIR}/../../../..) +QEMU=$(command -v qemu-system-$(uname -m)) +VERBOSE=0 +SKIP_BUILD=0 +VSOCK_TEST=${KERNEL_CHECKOUT}/tools/testing/vsock/vsock_test

+TEST_GUEST_PORT=51000 +TEST_HOST_PORT=50000 +TEST_HOST_PORT_LISTENER=50001 +SSH_GUEST_PORT=22 +SSH_HOST_PORT=2222 +VSOCK_CID=1234 +WAIT_PERIOD=3 +WAIT_PERIOD_MAX=20

+QEMU_PIDFILE=/tmp/qemu.pid

+# virtme-ng offers a netdev for ssh when using "--ssh", but we also need a +# control port forwarded for vsock_test. Because virtme-ng doesn't support +# adding an additional port to forward to the device created from "--ssh" and +# virtme-init mistakenly sets identical IPs to the ssh device and additional +# devices, we instead opt out of using --ssh, add the device manually, and also +# add the kernel cmdline options that virtme-init uses to setup the interface. +QEMU_OPTS="" +QEMU_OPTS="${QEMU_OPTS} -netdev user,id=n0,hostfwd=tcp::${TEST_HOST_PORT}-:${TEST_GUEST_PORT}" +QEMU_OPTS="${QEMU_OPTS},hostfwd=tcp::${SSH_HOST_PORT}-:${SSH_GUEST_PORT}" +QEMU_OPTS="${QEMU_OPTS} -device virtio-net-pci,netdev=n0" +QEMU_OPTS="${QEMU_OPTS} -device vhost-vsock-pci,guest-cid=${VSOCK_CID}" +QEMU_OPTS="${QEMU_OPTS} --pidfile ${QEMU_PIDFILE}"

What about:

QEMU_OPTS=" \ -netdev user,id=n0,hostfwd=tcp::${TEST_HOST_PORT}-:${TEST_GUEST_PORT},hostfwd=tcp::${SSH_HOST_PORT}-:${SSH_GUEST_PORT} \ -device virtio-net-pci,netdev=n0 \ -device vhost-vsock-pci,guest-cid=${VSOCK_CID} \ --pidfile ${QEMU_PIDFILE} "

Not a strong opinion, just I see too much "QEMU_OPTS="${QEMU_OPTS}" xD You can leave it in that way if you prefer.

+KERNEL_CMDLINE="virtme.dhcp net.ifnames=0 biosdevname=0 virtme.ssh virtme_ssh_user=$USER"

+LOG=${SCRIPT_DIR}/vmtest.log

+# Name Description +avail_tests="

• vm_server_host_client Run vsock_test in server mode on the VM and in client mode on the host.
• vm_client_host_server Run vsock_test in client mode on the VM and in server mode on the host.
• vm_loopback Run vsock_test using the loopback transport in the VM.

+"

+usage() {

• echo
• echo "$0 [OPTIONS] [TEST]..."
• echo "If no TEST argument is given, all tests will be run."
• echo
• echo "Options"
• echo " -v: verbose output"
• echo " -s: skip build"
• echo
• echo "Available tests${avail_tests}"
• exit 1

+}

+die() {

• echo "$*" >&2
• exit 1

+}

+vm_ssh() {

• ssh -q -o UserKnownHostsFile=/dev/null -p 2222 localhost $*

${SSH_HOST_PORT} instead of 2222, right?

The rest LGTM!

Thanks, Stefano

• return $?

+}

+cleanup() {

• if [[ -f "${QEMU_PIDFILE}" ]]; then

• pkill -SIGTERM -F ${QEMU_PIDFILE} 2>&1 >/dev/null
  

• fi

+}

+build() {

• log_setup "Building kernel and tests"
• pushd ${KERNEL_CHECKOUT} >/dev/null
• vng \

• --kconfig \
  

• --config ${KERNEL_CHECKOUT}/tools/testing/selftests/vsock/config.vsock
  

• make -j$(nproc)
• make -C ${KERNEL_CHECKOUT}/tools/testing/vsock
• popd >/dev/null
• echo

+}

+vm_setup() {

• local VNG_OPTS=""
• if [[ "${VERBOSE}" = 1 ]]; then

• VNG_OPTS="--verbose"
  

• fi
• vng \

• $VNG_OPTS \
  

• --run ${KERNEL_CHECKOUT} \
  

• --qemu-opts="${QEMU_OPTS}" \
  

• --qemu="${QEMU}" \
  

• --user root \
  

• --append "${KERNEL_CMDLINE}" \
  

• --rw  2>&1 >/dev/null &
  

+}

+vm_wait_for_ssh() {

• i=0
• while [[ true ]]; do

• if [[ ${i} > ${WAIT_PERIOD_MAX} ]]; then
  

• 	die "Timed out waiting for guest ssh"
  

• fi
  

• vm_ssh -- true
  

• if [[ $? -eq 0 ]]; then
  

• 	break
  

• fi
  

• i=$(( i + 1 ))
  

• sleep ${WAIT_PERIOD}
  

• done

+}

+wait_for_listener() {

• local PORT=$1
• local i=0
• while ! ss -ltn | grep -q ":${PORT}"; do

• if [[ ${i} > ${WAIT_PERIOD_MAX} ]]; then
  

• 	die "Timed out waiting for listener on port ${PORT}"
  

• fi
  

• i=$(( i + 1 ))
  

• sleep ${WAIT_PERIOD}
  

• done

+}

+vm_wait_for_listener() {

• local port=$1
• vm_ssh -- "$(declare -f wait_for_listener); wait_for_listener ${port}"

+}

+host_wait_for_listener() {

• wait_for_listener ${TEST_HOST_PORT_LISTENER}

+}

+log() {

• local prefix="$1"
• shift
• if [[ "$#" -eq 0 ]]; then

• cat | awk '{ printf "%s:\t%s\n","'"${prefix}"'", $0 }' | tee -a ${LOG}
  

• else

• echo "$*" | awk '{ printf "%s:\t%s\n","'"${prefix}"'", $0 }' | tee -a ${LOG}
  

• fi

+}

+log_setup() {

• log "setup" "$@"

+}

+log_host() {

• testname=$1
• shift
• log "test:${testname}:host" "$@"

+}

+log_guest() {

• testname=$1
• shift
• log "test:${testname}:guest" "$@"

+}

+test_vm_server_host_client() {

• local testname="${FUNCNAME[0]#test_}"
• vm_ssh -- "${VSOCK_TEST}" \

• --mode=server \
  

• --control-port="${TEST_GUEST_PORT}" \
  

• --peer-cid=2 \
  

• 2>&1 | log_guest "${testname}" &
  

• vm_wait_for_listener ${TEST_GUEST_PORT}
• ${VSOCK_TEST} \

• --mode=client \
  

• --control-host=127.0.0.1 \
  

• --peer-cid="${VSOCK_CID}" \
  

• --control-port="${TEST_HOST_PORT}" 2>&1 | log_host "${testname}"
  

• return $?

+}

+test_vm_client_host_server() {

• local testname="${FUNCNAME[0]#test_}"
• ${VSOCK_TEST} \

• --mode "server" \
  

• --control-port "${TEST_HOST_PORT_LISTENER}" \
  

• --peer-cid "${VSOCK_CID}" 2>&1 | log_host "${testname}" &
  

• host_wait_for_listener
• vm_ssh -- "${VSOCK_TEST}" \

• --mode=client \
  

• --control-host=10.0.2.2 \
  

• --peer-cid=2 \
  

• --control-port="${TEST_HOST_PORT_LISTENER}" 2>&1 | log_guest "${testname}"
  

• return $?

+}

+test_vm_loopback() {

• local testname="${FUNCNAME[0]#test_}"
• local port=60000 # non-forwarded local port
• vm_ssh -- ${VSOCK_TEST} \

• --mode=server \
  

• --control-port="${port}" \
  

• --peer-cid=1 2>&1 | log_guest "${testname}" &
  

• vm_wait_for_listener ${port}
• vm_ssh -- ${VSOCK_TEST} \

• --mode=client \
  

• --control-host="127.0.0.1" \
  

• --control-port="${port}" \
  

• --peer-cid=1 2>&1 | log_guest "${testname}"
  

• return $?

+}

+run_test() {

• unset IFS
• local host_oops_cnt_before
• local host_warn_cnt_before
• local vm_oops_cnt_before
• local vm_warn_cnt_before
• local host_oops_cnt_after
• local host_warn_cnt_after
• local vm_oops_cnt_after
• local vm_warn_cnt_after
• local name
• local rc
• host_oops_cnt_before=$(dmesg | grep -c -i 'Oops')
• host_warn_cnt_before=$(dmesg --level=warn | wc -l)
• vm_oops_cnt_before=$(vm_ssh -- dmesg | grep -c -i 'Oops')
• vm_warn_cnt_before=$(vm_ssh -- dmesg --level=warn | wc -l)
• name=$(echo "${1}" | awk '{ print $1 }')
• eval test_"${name}"
• host_oops_cnt_after=$(dmesg | grep -i 'Oops' | wc -l)
• if [[ ${host_oops_cnt_after} > ${host_oops_cnt_before} ]]; then

• echo "${name}: kernel oops detected on host" | log_host ${name}
  

• rc=1
  

• fi
• host_warn_cnt_after=$(dmesg --level=warn | wc -l)
• if [[ ${host_warn_cnt_after} > ${host_warn_cnt_before} ]]; then

• echo "${name}: kernel warning detected on host" | log_host ${name}
  

• rc=1
  

• fi
• vm_oops_cnt_after=$(vm_ssh -- dmesg | grep -i 'Oops' | wc -l)
• if [[ ${vm_oops_cnt_after} > ${vm_oops_cnt_before} ]]; then

• echo "${name}: kernel oops detected on vm" | log_host ${name}
  

• rc=1
  

• fi
• vm_warn_cnt_after=$(vm_ssh -- dmesg --level=warn | wc -l)
• if [[ ${vm_warn_cnt_after} > ${vm_warn_cnt_before} ]]; then

• echo "${name}: kernel warning detected on vm" | log_host ${name}
  

• rc=1
  

• fi
• return ${rc}

+}

+while getopts :hvsq: o +do

• case $o in
• v) VERBOSE=1;;
• s) SKIP_BUILD=1;;
• q) QEMU=$OPTARG;;
• h|*) usage;;
• esac

+done +shift $((OPTIND-1))

+trap cleanup EXIT

+if [[ ! -x "$(command -v vng)" ]]; then

• die "vng not found."

+fi

+if [[ ! -x "${QEMU}" ]]; then

• die "${QEMU} not found."

+fi

+rm -f "${LOG}" +if [[ "${SKIP_BUILD}" != 1 ]]; then

• build

+fi +log_setup "Booting up VM" +vm_setup +vm_wait_for_ssh +log_setup "VM booted up"

+for arg in "$@"; do

• if ! command -v > /dev/null "test_${arg}"; then

• echo "Test ${arg} not found"
  

• die "${usage}"
  

• fi

+done

+IFS=" +" +cnt=0 +name="" +desc="" +for t in ${avail_tests}; do

• [ "${name}" = "" ] && name="${t}" && continue
• # desc is unused, but we need to eat it.
• [ "${desc}" = "" ] && desc="${t}"
• run_this=0
• if [[ "${#}" -eq 0 ]]; then

• run_this=1
  

• else

• for arg in "$@"; do
  

• 	if [[ "${arg}" = "${name}" ]]; then
  

• 		run_this=1
  

• 	fi
  

• done
  

• fi
• if [[ "${run_this}" = 1 ]]; then

• run_test "${name}"
  

• rc=$?
  

• if [[ ${rc} != 0 ]]; then
  

• 	cnt=$(( cnt + 1 ))
  

• fi
  

• fi
• name=""
• desc=""

+done

+if [[ ${cnt} = 0 ]]; then

• echo OK

+else

• echo FAILED: ${cnt}

+fi +echo "Log: ${LOG}" +exit ${cnt}

---

base-commit: 8066e388be48f1ad62b0449dc1d31a25489fa12a change-id: 20250325-vsock-vmtest-b3a21d2102c2

Best regards,

Bobby Eshleman bobbyeshleman@gmail.com