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selftests/vsock: add namespace tests for CID collisions

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Add tests to verify CID collision rules across different vsock namespace
modes.

1. Two VMs with the same CID cannot start in different global namespaces
   (ns_global_same_cid_fails)
2. Two VMs with the same CID can start in different local namespaces
   (ns_local_same_cid_ok)
3. VMs with the same CID can coexist when one is in a global namespace
   and another is in a local namespace (ns_global_local_same_cid_ok and
   ns_local_global_same_cid_ok)

The tests ns_global_local_same_cid_ok and ns_local_global_same_cid_ok
make sure that ordering does not matter.

The tests use a shared helper function namespaces_can_boot_same_cid()
that attempts to start two VMs with identical CIDs in the specified
namespaces and verifies whether VM initialization failed or succeeded.

Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com>
Link: https://patch.msgid.link/20260121-vsock-vmtest-v16-10-2859a7512097@meta.com
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Bobby Eshleman
2026-01-21 14:11:50 -08:00
committed by Paolo Abeni
parent 06cf7895ab
commit 605caec5ad
1 changed files with 78 additions and 0 deletions
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78
tools/testing/selftests/vsock/vmtest.sh
View File

@@ -50,6 +50,10 @@ readonly TEST_NAMES=(
vm_loopback
ns_host_vsock_ns_mode_ok
ns_host_vsock_child_ns_mode_ok
ns_global_same_cid_fails
ns_local_same_cid_ok
ns_global_local_same_cid_ok
ns_local_global_same_cid_ok
)
readonly TEST_DESCS=(
# vm_server_host_client
@@ -66,6 +70,18 @@ readonly TEST_DESCS=(
# ns_host_vsock_child_ns_mode_ok
"Check /proc/sys/net/vsock/ns_mode is read-only and child_ns_mode is writable."
# ns_global_same_cid_fails
"Check QEMU fails to start two VMs with same CID in two different global namespaces."
# ns_local_same_cid_ok
"Check QEMU successfully starts two VMs with same CID in two different local namespaces."
# ns_global_local_same_cid_ok
"Check QEMU successfully starts one VM in a global ns and then another VM in a local ns with the same CID."
# ns_local_global_same_cid_ok
"Check QEMU successfully starts one VM in a local ns and then another VM in a global ns with the same CID."
)
readonly USE_SHARED_VM=(
@@ -577,6 +593,68 @@ test_ns_host_vsock_ns_mode_ok() {
return "${KSFT_PASS}"
}
namespaces_can_boot_same_cid() {
local ns0=$1
local ns1=$2
local pidfile1 pidfile2
local rc
pidfile1="$(create_pidfile)"
# The first VM should be able to start. If it can't then we have
# problems and need to return non-zero.
if ! vm_start "${pidfile1}" "${ns0}"; then
return 1
fi
pidfile2="$(create_pidfile)"
vm_start "${pidfile2}" "${ns1}"
rc=$?
terminate_pidfiles "${pidfile1}" "${pidfile2}"
return "${rc}"
}
test_ns_global_same_cid_fails() {
init_namespaces
if namespaces_can_boot_same_cid "global0" "global1"; then
return "${KSFT_FAIL}"
fi
return "${KSFT_PASS}"
}
test_ns_local_global_same_cid_ok() {
init_namespaces
if namespaces_can_boot_same_cid "local0" "global0"; then
return "${KSFT_PASS}"
fi
return "${KSFT_FAIL}"
}
test_ns_global_local_same_cid_ok() {
init_namespaces
if namespaces_can_boot_same_cid "global0" "local0"; then
return "${KSFT_PASS}"
fi
return "${KSFT_FAIL}"
}
test_ns_local_same_cid_ok() {
init_namespaces
if namespaces_can_boot_same_cid "local0" "local1"; then
return "${KSFT_PASS}"
fi
return "${KSFT_FAIL}"
}
test_ns_host_vsock_child_ns_mode_ok() {
local orig_mode
local rc