1#!/bin/bash 2# perf kvm tests 3# SPDX-License-Identifier: GPL-2.0 4 5set -e 6 7err=0 8perfdata=$(mktemp /tmp/__perf_kvm_test.perf.data.XXXXX) 9qemu_pid_file=$(mktemp /tmp/__perf_kvm_test.qemu.pid.XXXXX) 10log_file=$(mktemp /tmp/__perf_kvm_test.live_log.XXXXX) 11 12cleanup() { 13 rm -f "${perfdata}" "${log_file}" 14 if [ -f "${qemu_pid_file}" ]; then 15 if [ -s "${qemu_pid_file}" ]; then 16 qemu_pid=$(cat "${qemu_pid_file}") 17 if [ -n "${qemu_pid}" ]; then 18 kill "${qemu_pid}" 2>/dev/null || true 19 fi 20 fi 21 rm -f "${qemu_pid_file}" 22 fi 23 trap - EXIT TERM INT 24} 25 26trap_cleanup() { 27 echo "Unexpected signal in ${FUNCNAME[1]}" 28 cleanup 29 exit 1 30} 31trap trap_cleanup EXIT TERM INT 32 33skip() { 34 echo "Skip: $1" 35 cleanup 36 exit 2 37} 38 39test_kvm_stat() { 40 echo "Testing perf kvm stat" 41 42 echo "Recording kvm events for pid ${qemu_pid}..." 43 if ! perf kvm stat record -p "${qemu_pid}" -o "${perfdata}" sleep 1; then 44 echo "Failed to record kvm events" 45 err=1 46 return 47 fi 48 49 echo "Reporting kvm events..." 50 if ! perf kvm -i "${perfdata}" stat report 2>&1 | grep -q "VM-EXIT"; then 51 echo "Failed to find VM-EXIT in report" 52 perf kvm -i "${perfdata}" stat report 2>&1 53 err=1 54 return 55 fi 56 57 echo "perf kvm stat test [Success]" 58} 59 60test_kvm_record_report() { 61 echo "Testing perf kvm record/report" 62 63 echo "Recording kvm profile for pid ${qemu_pid}..." 64 # Use --host to avoid needing guest symbols/mounts for this simple test 65 # We just want to verify the command runs and produces data 66 # We run in background and kill it because 'perf kvm record' appends options 67 # after the command, which breaks 'sleep' (e.g. it gets '-e cycles'). 68 perf kvm --host record -p "${qemu_pid}" -o "${perfdata}" & 69 rec_pid=$! 70 sleep 1 71 kill -INT "${rec_pid}" 72 wait "${rec_pid}" || true 73 74 echo "Reporting kvm profile..." 75 # Check for some standard output from report 76 if ! perf kvm -i "${perfdata}" report --stdio 2>&1 | grep -q "Event count"; then 77 echo "Failed to report kvm profile" 78 perf kvm -i "${perfdata}" report --stdio 2>&1 79 err=1 80 return 81 fi 82 83 echo "perf kvm record/report test [Success]" 84} 85 86test_kvm_buildid_list() { 87 echo "Testing perf kvm buildid-list" 88 89 # We reuse the perf.data from the previous record test 90 if ! perf kvm --host -i "${perfdata}" buildid-list 2>&1 | grep -q "."; then 91 echo "Failed to list buildids" 92 perf kvm --host -i "${perfdata}" buildid-list 2>&1 93 err=1 94 return 95 fi 96 97 echo "perf kvm buildid-list test [Success]" 98} 99 100test_kvm_stat_live() { 101 echo "Testing perf kvm stat live" 102 103 # Run perf kvm live for 5 seconds, monitoring that PID 104 # Use sleep to keep stdin open but silent, preventing EOF loop or interactive spam 105 if ! sleep 10 | timeout 5s perf kvm stat live -p "${qemu_pid}" > "${log_file}" 2>&1; then 106 retval=$? 107 if [ $retval -ne 124 ] && [ $retval -ne 0 ]; then 108 echo "perf kvm stat live [Failed: perf kvm stat live failed to start or run (ret=$retval)]" 109 head -n 50 "${log_file}" 110 err=1 111 return 112 fi 113 fi 114 115 # Check for some sample data (percentage) 116 if ! grep -E -q "[0-9]+\.[0-9]+%" "${log_file}"; then 117 echo "perf kvm stat live [Failed: no sample percentage found]" 118 head -n 50 "${log_file}" 119 err=1 120 return 121 fi 122 123 echo "perf kvm stat live test [Success]" 124} 125 126setup_qemu() { 127 # Find qemu 128 if [ "$(uname -m)" = "x86_64" ]; then 129 qemu="qemu-system-x86_64" 130 elif [ "$(uname -m)" = "aarch64" ]; then 131 qemu="qemu-system-aarch64" 132 elif [ "$(uname -m)" = "s390x" ]; then 133 qemu="qemu-system-s390x" 134 elif [ "$(uname -m)" = "ppc64le" ]; then 135 qemu="qemu-system-ppc64" 136 else 137 qemu="qemu-system-$(uname -m)" 138 fi 139 140 if ! which -s "$qemu"; then 141 skip "$qemu not found" 142 fi 143 144 if [ ! -r /dev/kvm ] || [ ! -w /dev/kvm ]; then 145 skip "/dev/kvm not accessible" 146 fi 147 148 if ! perf kvm stat record -o /dev/null -a sleep 0.01 >/dev/null 2>&1; then 149 skip "No permission to record kvm events" 150 fi 151 152 echo "Starting $qemu..." 153 # Start qemu in background, detached, with pidfile 154 # We use -display none -daemonize and a monitor to keep it alive/controllable if needed 155 # We don't need a real kernel, just KVM active. 156 if ! $qemu -enable-kvm -display none -daemonize -pidfile "${qemu_pid_file}" -monitor none; then 157 echo "Failed to start qemu" 158 err=1 159 return 160 fi 161 162 # Wait a bit for qemu to start 163 sleep 1 164 qemu_pid=$(cat "${qemu_pid_file}") 165 166 if ! kill -0 "${qemu_pid}" 2>/dev/null; then 167 echo "Qemu process failed to stay alive" 168 err=1 169 return 170 fi 171} 172 173setup_qemu 174if [ $err -eq 0 ]; then 175 test_kvm_stat 176 test_kvm_record_report 177 test_kvm_buildid_list 178 test_kvm_stat_live 179fi 180 181cleanup 182exit $err 183