1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0+
3#
4# Carry out a kvm-based run for the specified qemu-cmd file, which might
5# have been generated by --build-only kvm.sh run.
6#
7# Usage: kvm-test-1-run-qemu.sh qemu-cmd-dir
8#
9# qemu-cmd-dir provides the directory containing qemu-cmd file.
10#	This is assumed to be of the form prefix/ds/scenario, where
11#	"ds" is the top-level date-stamped directory and "scenario"
12#	is the scenario name.  Any required adjustments to this file
13#	must have been made by the caller.  The shell-command comments
14#	at the end of the qemu-cmd file are not optional.
15#
16# Copyright (C) 2021 Facebook, Inc.
17#
18# Authors: Paul E. McKenney <paulmck@kernel.org>
19
20T=${TMPDIR-/tmp}/kvm-test-1-run-qemu.sh.$$
21trap 'rm -rf $T' 0
22mkdir $T
23
24resdir="$1"
25if ! test -d "$resdir"
26then
27	echo $0: Nonexistent directory: $resdir
28	exit 1
29fi
30if ! test -f "$resdir/qemu-cmd"
31then
32	echo $0: Nonexistent qemu-cmd file: $resdir/qemu-cmd
33	exit 1
34fi
35
36echo ' ---' `date`: Starting kernel, PID $$
37
38# Obtain settings from the qemu-cmd file.
39grep '^#' $resdir/qemu-cmd | sed -e 's/^# //' > $T/qemu-cmd-settings
40. $T/qemu-cmd-settings
41
42# Decorate qemu-cmd with redirection, backgrounding, and PID capture
43sed -e 's/$/ 2>\&1 \&/' < $resdir/qemu-cmd > $T/qemu-cmd
44echo 'echo $! > $resdir/qemu_pid' >> $T/qemu-cmd
45
46# In case qemu refuses to run...
47echo "NOTE: $QEMU either did not run or was interactive" > $resdir/console.log
48
49# Attempt to run qemu
50kstarttime=`gawk 'BEGIN { print systime() }' < /dev/null`
51( . $T/qemu-cmd; wait `cat  $resdir/qemu_pid`; echo $? > $resdir/qemu-retval ) &
52commandcompleted=0
53if test -z "$TORTURE_KCONFIG_GDB_ARG"
54then
55	sleep 10 # Give qemu's pid a chance to reach the file
56	if test -s "$resdir/qemu_pid"
57	then
58		qemu_pid=`cat "$resdir/qemu_pid"`
59		echo Monitoring qemu job at pid $qemu_pid
60	else
61		qemu_pid=""
62		echo Monitoring qemu job at yet-as-unknown pid
63	fi
64fi
65if test -n "$TORTURE_KCONFIG_GDB_ARG"
66then
67	base_resdir=`echo $resdir | sed -e 's/\.[0-9]\+$//'`
68	if ! test -f $base_resdir/vmlinux
69	then
70		base_resdir="`cat re-run`/$resdir"
71		if ! test -f $base_resdir/vmlinux
72		then
73			base_resdir=/path/to
74		fi
75	fi
76	echo Waiting for you to attach a debug session, for example: > /dev/tty
77	echo "    gdb $base_resdir/vmlinux" > /dev/tty
78	echo 'After symbols load and the "(gdb)" prompt appears:' > /dev/tty
79	echo "    target remote :1234" > /dev/tty
80	echo "    continue" > /dev/tty
81	kstarttime=`gawk 'BEGIN { print systime() }' < /dev/null`
82fi
83while :
84do
85	if test -z "$qemu_pid" -a -s "$resdir/qemu_pid"
86	then
87		qemu_pid=`cat "$resdir/qemu_pid"`
88	fi
89	kruntime=`gawk 'BEGIN { print systime() - '"$kstarttime"' }' < /dev/null`
90	if test -z "$qemu_pid" || kill -0 "$qemu_pid" > /dev/null 2>&1
91	then
92		if test -n "$TORTURE_KCONFIG_GDB_ARG"
93		then
94			:
95		elif test $kruntime -ge $seconds || test -f "$resdir/../STOP.1"
96		then
97			break;
98		fi
99		sleep 1
100	else
101		commandcompleted=1
102		if test $kruntime -lt $seconds
103		then
104			echo Completed in $kruntime vs. $seconds >> $resdir/Warnings 2>&1
105			grep "^(qemu) qemu:" $resdir/kvm-test-1-run.sh.out >> $resdir/Warnings 2>&1
106			killpid="`sed -n "s/^(qemu) qemu: terminating on signal [0-9]* from pid \([0-9]*\).*$/\1/p" $resdir/Warnings`"
107			if test -n "$killpid"
108			then
109				echo "ps -fp $killpid" >> $resdir/Warnings 2>&1
110				ps -fp $killpid >> $resdir/Warnings 2>&1
111			fi
112		else
113			echo ' ---' `date`: "Kernel done"
114		fi
115		break
116	fi
117done
118if test -z "$qemu_pid" -a -s "$resdir/qemu_pid"
119then
120	qemu_pid=`cat "$resdir/qemu_pid"`
121fi
122if test $commandcompleted -eq 0 -a -n "$qemu_pid"
123then
124	if ! test -f "$resdir/../STOP.1"
125	then
126		echo Grace period for qemu job at pid $qemu_pid
127	fi
128	oldline="`tail $resdir/console.log`"
129	while :
130	do
131		if test -f "$resdir/../STOP.1"
132		then
133			echo "PID $qemu_pid killed due to run STOP.1 request" >> $resdir/Warnings 2>&1
134			kill -KILL $qemu_pid
135			break
136		fi
137		kruntime=`gawk 'BEGIN { print systime() - '"$kstarttime"' }' < /dev/null`
138		if kill -0 $qemu_pid > /dev/null 2>&1
139		then
140			:
141		else
142			break
143		fi
144		must_continue=no
145		newline="`tail $resdir/console.log`"
146		if test "$newline" != "$oldline" && echo $newline | grep -q ' [0-9]\+us : '
147		then
148			must_continue=yes
149		fi
150		last_ts="`tail $resdir/console.log | grep '^\[ *[0-9]\+\.[0-9]\+]' | tail -1 | sed -e 's/^\[ *//' -e 's/\..*$//'`"
151		if test -z "$last_ts"
152		then
153			last_ts=0
154		fi
155		if test "$newline" != "$oldline" -a "$last_ts" -lt $((seconds + $TORTURE_SHUTDOWN_GRACE))
156		then
157			must_continue=yes
158		fi
159		if test $must_continue = no -a $kruntime -ge $((seconds + $TORTURE_SHUTDOWN_GRACE))
160		then
161			echo "!!! PID $qemu_pid hung at $kruntime vs. $seconds seconds" >> $resdir/Warnings 2>&1
162			kill -KILL $qemu_pid
163			break
164		fi
165		oldline=$newline
166		sleep 10
167	done
168elif test -z "$qemu_pid"
169then
170	echo Unknown PID, cannot kill qemu command
171fi
172
173# Tell the script that this run is done.
174rm -f $resdir/build.run
175
176parse-console.sh $resdir/console.log $title
177