run-vmtest: update vmtest configuration

Bump vmtest [1] version to 0.18.0

Factor out vmtest cli args into a proper .toml configuration.  Set
num_cpus to 4 (default was 2), to enable additional BPF selftests.

Signed-off-by: Ihor Solodrai <[email protected]>

Author: theihor

run-vmtest/action.yml

@@ -30,7 +30,7 @@ inputs:
   vmtest-release:
     description: 'Release version of vmtest tool to use'
     required: false
-    default: 'v0.15.0'
+    default: 'v0.18.0'
 
 runs:
   using: "composite"

run-vmtest/run.sh

@@ -86,10 +86,13 @@ foldable start vmtest "Starting virtual machine..."
 
 # Tests may be comma-separated. vmtest_selftest expect them to come from CLI space-separated.
 TEST_RUNNERS=$(echo ${KERNEL_TEST} | tr -s ',' ' ')
-vmtest -k "${VMLINUZ}" --kargs "panic=-1 sysctl.vm.panic_on_oom=1" \
-       "${GITHUB_ACTION_PATH}/vmtest-init.sh && \
-        cd '${GITHUB_WORKSPACE}'             && \
-        ${VMTEST_SCRIPT} ${TEST_RUNNERS}"
+
+export VMLINUZ TEST_RUNNERS VMTEST_SCRIPT
+VMTEST_TOML=$(mktemp /tmp/vmtest.XXXXXX.toml)
+envsubst < "${GITHUB_ACTION_PATH}/vmtest.toml" > $VMTEST_TOML
+echo "cat $VMTEST_TOML"
+cat $VMTEST_TOML
+vmtest -c $VMTEST_TOML
 
 # fixup traffic montioring log paths if present
 PCAP_DIR=/tmp/tmon_pcap

run-vmtest/vmtest.toml

@@ -0,0 +1,13 @@
+[[target]]
+name = "run-vmtest"
+kernel = "${VMLINUZ}"
+kernel_args = "panic=-1 sysctl.vm.panic_on_oom=1"
+command = """\
+${GITHUB_ACTION_PATH}/vmtest-init.sh && \
+cd ${GITHUB_WORKSPACE} && \
+${VMTEST_SCRIPT} ${TEST_RUNNERS} \
+"""
+
+[target.vm]
+num_cpus = 4
+