* [PATCH v2 0/2] Implement -run-with exit-with-parent=on
@ 2025-10-09 16:12 Richard W.M. Jones
2025-10-09 16:12 ` [PATCH v2 1/2] " Richard W.M. Jones
2025-10-09 16:12 ` [PATCH v2 2/2] tests/qtest: Use exit-with-parent=on in qtest invocations Richard W.M. Jones
0 siblings, 2 replies; 5+ messages in thread
From: Richard W.M. Jones @ 2025-10-09 16:12 UTC (permalink / raw)
To: qemu-devel; +Cc: lvivier, farosas, pbonzini, berrange
v1 was here:
https://lists.gnu.org/archive/html/qemu-devel/2025-10/msg00762.html
In v2:
- Fix unused variable warning.
- Remove the #ifdefs from the libqtest.c code.
- Add the missing S-o-B in the second patch.
- Rebase and retest.
As before, one test fails both before and after this change:
4/405 qemu:func-quick+func-x86_64 / func-x86_64-bad_vmstate ERROR 0.15s exit status 1
And as before, some questions:
- There's no way to find out if the qemu binary supports
exit-with-parent=on except to try it. Maybe this should be exposed
somehow?
- Or should we have exit-with-parent=best ?
- On macOS I wasn't able to find a satisfactory way to force
shutdown, except calling 'qemu_system_killed' and pretending we'd
been killed by SIGTERM (which does at least emulate what Linux &
FreeBSD do). I suppose it'd be nice if there was a "killed by
parent" reason which also forced shutdown.
Rich.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v2 1/2] Implement -run-with exit-with-parent=on
2025-10-09 16:12 [PATCH v2 0/2] Implement -run-with exit-with-parent=on Richard W.M. Jones
@ 2025-10-09 16:12 ` Richard W.M. Jones
2025-10-10 10:09 ` Daniel P. Berrangé
2025-10-09 16:12 ` [PATCH v2 2/2] tests/qtest: Use exit-with-parent=on in qtest invocations Richard W.M. Jones
1 sibling, 1 reply; 5+ messages in thread
From: Richard W.M. Jones @ 2025-10-09 16:12 UTC (permalink / raw)
To: qemu-devel; +Cc: lvivier, farosas, pbonzini, berrange
Libguestfs wants to use qemu to run a captive appliance. When the
program linked to libguestfs exits, we want qemu to be cleaned up.
Libguestfs goes to great lengths to do this at the moment: it either
forks a separate process to ensure clean-up is done, or it asks
libvirt to clean up the qemu process. However this is complicated and
not totally reliable.
On Linux, FreeBSD and macOS, there are mechanisms to ensure a signal
or message is delivered to a process when its parent process goes
away. The qemu test suite even uses this mechanism on Linux (see
PR_SET_PDEATHSIG in tests/qtest/libqtest.c).
In nbdkit we have long had the concept of running nbdkit captively,
and we have the nbdkit --exit-with-parent flag to help
(https://libguestfs.org/nbdkit-captive.1.html#EXIT-WITH-PARENT)
This commit adds the same mechanism. The syntax is:
qemu -run-with exit-with-parent=on [...]
This is not a feature that most typical users of qemu (for running
general purpose, long-lived VMs) should use, so it defaults to off.
The exit-with-parent.[ch] files are copied from nbdkit, where they
have a 3-clause BSD license which is compatible with qemu:
https://gitlab.com/nbdkit/nbdkit/-/tree/master/common/utils?ref_type=heads
Thanks: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
---
include/qemu/exit-with-parent.h | 57 +++++++++++++
qemu-options.hx | 13 ++-
system/exit-with-parent.c | 140 ++++++++++++++++++++++++++++++++
system/meson.build | 1 +
system/vl.c | 13 +++
5 files changed, 222 insertions(+), 2 deletions(-)
diff --git a/include/qemu/exit-with-parent.h b/include/qemu/exit-with-parent.h
new file mode 100644
index 0000000000..c00b863fe9
--- /dev/null
+++ b/include/qemu/exit-with-parent.h
@@ -0,0 +1,57 @@
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ * Originally derived from nbdkit common/utils/exit-with-parent.h
+ * Copyright Red Hat
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of Red Hat nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef NBDKIT_EXIT_WITH_PARENT_H
+#define NBDKIT_EXIT_WITH_PARENT_H
+
+/* Test if the feature is available on the platform. */
+static inline bool can_exit_with_parent(void)
+{
+#if defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__)
+ return true;
+#else
+ return false;
+#endif
+}
+
+/*
+ * --exit-with-parent: kill the current process if the parent exits.
+ * This may return -1 on error.
+ *
+ * Note this will abort on platforms where can_exit_with_parent()
+ * returned false.
+ */
+extern int set_exit_with_parent(void);
+
+#endif /* NBDKIT_EXIT_WITH_PARENT_H */
diff --git a/qemu-options.hx b/qemu-options.hx
index cc2ef4424e..bf745f354d 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -5467,15 +5467,18 @@ DEF("qtest-log", HAS_ARG, QEMU_OPTION_qtest_log, "", QEMU_ARCH_ALL)
#if defined(CONFIG_POSIX) && !defined(EMSCRIPTEN)
DEF("run-with", HAS_ARG, QEMU_OPTION_run_with,
- "-run-with [async-teardown=on|off][,chroot=dir][user=username|uid:gid]\n"
+ "-run-with [async-teardown=on|off][,chroot=dir]\n" \
+ " [,exit-with-parent=on|off][,user=username|uid:gid]\n"
" Set miscellaneous QEMU process lifecycle options:\n"
" async-teardown=on enables asynchronous teardown (Linux only)\n"
+ " exit-with-parent=on causes QEMU to exit if the parent\n"
+ " process of QEMU exits (Linux, FreeBSD, macOS only)\n"
" chroot=dir chroot to dir just before starting the VM\n"
" user=username switch to the specified user before starting the VM\n"
" user=uid:gid ditto, but use specified user-ID and group-ID instead\n",
QEMU_ARCH_ALL)
SRST
-``-run-with [async-teardown=on|off][,chroot=dir][user=username|uid:gid]``
+``-run-with [async-teardown=on|off][,chroot=dir][,exit-with-parent=on|off][,user=username|uid:gid]``
Set QEMU process lifecycle options.
``async-teardown=on`` enables asynchronous teardown. A new process called
@@ -5493,6 +5496,12 @@ SRST
immediately before starting the guest execution. This is especially useful
in combination with ``user=...``.
+ ``exit-with-parent=on`` causes QEMU to exit if the parent process of
+ QEMU exits. This can be used when QEMU runs a captive appliance,
+ where the lifetime of the appliance is scoped to the parent process.
+ In case the parent process crashes, QEMU is still cleaned up.
+ This only works on Linux, FreeBSD and macOS platforms.
+
``user=username`` or ``user=uid:gid`` can be used to drop root privileges
before starting guest execution. QEMU will use the ``setuid`` and ``setgid``
system calls to switch to the specified identity. Note that the
diff --git a/system/exit-with-parent.c b/system/exit-with-parent.c
new file mode 100644
index 0000000000..df65d2231a
--- /dev/null
+++ b/system/exit-with-parent.c
@@ -0,0 +1,140 @@
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ * Originally derived from nbdkit common/utils/exit-with-parent.c
+ * Copyright Red Hat
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of Red Hat nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Implement the --exit-with-parent feature on operating systems which
+ * support it.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/exit-with-parent.h"
+
+#if defined(__linux__)
+
+#include <sys/prctl.h>
+
+/*
+ * Send SIGTERM to self when the parent exits. This will cause
+ * qemu_system_killed() to be called.
+ *
+ * PR_SET_PDEATHSIG has been defined since Linux 2.1.57.
+ */
+int
+set_exit_with_parent(void)
+{
+ return prctl(PR_SET_PDEATHSIG, SIGTERM);
+}
+
+#elif defined(__FreeBSD__)
+
+#include <sys/procctl.h>
+
+/*
+ * Send SIGTERM to self when the parent exits. This will cause
+ * qemu_system_killed() to be called.
+ *
+ * PROC_PDEATHSIG_CTL has been defined since FreeBSD 11.2.
+ */
+int
+set_exit_with_parent(void)
+{
+ const int sig = SIGTERM;
+ return procctl(P_PID, 0, PROC_PDEATHSIG_CTL, (void *) &sig);
+}
+
+#elif defined(__APPLE__)
+
+/* For macOS. */
+
+#include "qemu/thread.h"
+#include "qemu/error-report.h"
+#include "system/runstate.h"
+#include <sys/event.h>
+
+static void *
+exit_with_parent_loop(void *vp)
+{
+ const pid_t ppid = getppid();
+ int fd;
+ struct kevent kev, res[1];
+ int r;
+
+ /* Register the kevent to wait for ppid to exit. */
+ fd = kqueue();
+ if (fd == -1) {
+ error_report("exit_with_parent_loop: kqueue: %m");
+ return NULL;
+ }
+ EV_SET(&kev, ppid, EVFILT_PROC, EV_ADD | EV_ENABLE, NOTE_EXIT, 0, NULL);
+ if (kevent(fd, &kev, 1, NULL, 0, NULL) == -1) {
+ error_report("exit_with_parent_loop: kevent: %m");
+ close(fd);
+ return NULL;
+ }
+
+ /* Wait for the kevent to happen. */
+ r = kevent(fd, 0, 0, res, 1, NULL);
+ if (r == 1 && res[0].ident == ppid) {
+ /* Behave like Linux and FreeBSD above, as if SIGTERM was sent */
+ qemu_system_killed(SIGTERM, ppid);
+ }
+
+ return NULL;
+}
+
+int
+set_exit_with_parent(void)
+{
+ QemuThread exit_with_parent_thread;
+
+ /*
+ * We have to block waiting for kevent, so that requires that we
+ * start a background thread.
+ */
+ qemu_thread_create(&exit_with_parent_thread,
+ "exit-parent",
+ exit_with_parent_loop, NULL,
+ QEMU_THREAD_DETACHED);
+ return 0;
+}
+
+#else /* any platform that doesn't support this function */
+
+int
+set_exit_with_parent(void)
+{
+ g_assert_not_reached();
+}
+
+#endif
diff --git a/system/meson.build b/system/meson.build
index 6d21ff9faa..4b69ef0f5f 100644
--- a/system/meson.build
+++ b/system/meson.build
@@ -15,6 +15,7 @@ system_ss.add(files(
'datadir.c',
'dirtylimit.c',
'dma-helpers.c',
+ 'exit-with-parent.c',
'globals.c',
'ioport.c',
'ram-block-attributes.c',
diff --git a/system/vl.c b/system/vl.c
index 646239e4a6..1fbd37328c 100644
--- a/system/vl.c
+++ b/system/vl.c
@@ -53,6 +53,7 @@
#include "qemu/sockets.h"
#include "qemu/accel.h"
#include "qemu/async-teardown.h"
+#include "qemu/exit-with-parent.h"
#include "hw/usb.h"
#include "hw/isa/isa.h"
#include "hw/scsi/scsi.h"
@@ -783,6 +784,10 @@ static QemuOptsList qemu_run_with_opts = {
.name = "chroot",
.type = QEMU_OPT_STRING,
},
+ {
+ .name = "exit-with-parent",
+ .type = QEMU_OPT_BOOL,
+ },
{
.name = "user",
.type = QEMU_OPT_STRING,
@@ -3690,6 +3695,14 @@ void qemu_init(int argc, char **argv)
if (str) {
os_set_chroot(str);
}
+ if (qemu_opt_get_bool(opts, "exit-with-parent", false)) {
+ if (!can_exit_with_parent()) {
+ error_report("exit-with-parent is not available"
+ " on this platform");
+ exit(1);
+ }
+ set_exit_with_parent();
+ }
str = qemu_opt_get(opts, "user");
if (str) {
if (!os_set_runas(str)) {
--
2.50.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v2 2/2] tests/qtest: Use exit-with-parent=on in qtest invocations
2025-10-09 16:12 [PATCH v2 0/2] Implement -run-with exit-with-parent=on Richard W.M. Jones
2025-10-09 16:12 ` [PATCH v2 1/2] " Richard W.M. Jones
@ 2025-10-09 16:12 ` Richard W.M. Jones
2025-10-10 10:10 ` Daniel P. Berrangé
1 sibling, 1 reply; 5+ messages in thread
From: Richard W.M. Jones @ 2025-10-09 16:12 UTC (permalink / raw)
To: qemu-devel; +Cc: lvivier, farosas, pbonzini, berrange
Previously libqtest.c set PR_SET_PDEATHSIG (or the equivalent on
FreeBSD) after forking the qemu subprocess. However we can get the
same behaviour now by using the new -run-with exit-with-parent=on
flag, on platforms that support it.
Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
---
tests/qtest/libqtest.c | 22 ++++------------------
1 file changed, 4 insertions(+), 18 deletions(-)
diff --git a/tests/qtest/libqtest.c b/tests/qtest/libqtest.c
index 933d085869..622464e365 100644
--- a/tests/qtest/libqtest.c
+++ b/tests/qtest/libqtest.c
@@ -33,6 +33,7 @@
#include "qemu/accel.h"
#include "qemu/ctype.h"
#include "qemu/cutils.h"
+#include "qemu/exit-with-parent.h"
#include "qemu/sockets.h"
#include "qobject/qdict.h"
#include "qobject/qjson.h"
@@ -433,24 +434,6 @@ static QTestState *qtest_spawn_qemu(const char *qemu_bin, const char *args,
#ifndef _WIN32
pid = fork();
if (pid == 0) {
-#ifdef __linux__
- /*
- * Although we register a ABRT handler to kill off QEMU
- * when g_assert() triggers, we want an extra safety
- * net. The QEMU process might be non-functional and
- * thus not have responded to SIGTERM. The test script
- * might also have crashed with SEGV, in which case the
- * cleanup handlers won't ever run.
- *
- * This PR_SET_PDEATHSIG setup will ensure any remaining
- * QEMU will get terminated with SIGKILL in these cases.
- */
- prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
-#endif /* __linux__ */
-#ifdef __FreeBSD__
- int sig = SIGKILL;
- procctl(P_PID, getpid(), PROC_PDEATHSIG_CTL, &sig);
-#endif /* __FreeBSD__ */
execlp("/bin/sh", "sh", "-c", command->str, NULL);
exit(1);
}
@@ -482,12 +465,15 @@ gchar *qtest_qemu_args(const char *extra_args)
"-display none "
"-audio none "
"%s"
+ "%s"
" -accel qtest",
tracearg,
socket_path,
getenv("QTEST_LOG") ? DEV_STDERR : DEV_NULL,
qmp_socket_path,
+ can_exit_with_parent() ?
+ "-run-with exit-with-parent=on " : "",
extra_args ?: "");
return args;
--
2.50.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v2 1/2] Implement -run-with exit-with-parent=on
2025-10-09 16:12 ` [PATCH v2 1/2] " Richard W.M. Jones
@ 2025-10-10 10:09 ` Daniel P. Berrangé
0 siblings, 0 replies; 5+ messages in thread
From: Daniel P. Berrangé @ 2025-10-10 10:09 UTC (permalink / raw)
To: Richard W.M. Jones; +Cc: qemu-devel, lvivier, farosas, pbonzini
On Thu, Oct 09, 2025 at 05:12:46PM +0100, Richard W.M. Jones wrote:
> Libguestfs wants to use qemu to run a captive appliance. When the
> program linked to libguestfs exits, we want qemu to be cleaned up.
> Libguestfs goes to great lengths to do this at the moment: it either
> forks a separate process to ensure clean-up is done, or it asks
> libvirt to clean up the qemu process. However this is complicated and
> not totally reliable.
>
> On Linux, FreeBSD and macOS, there are mechanisms to ensure a signal
> or message is delivered to a process when its parent process goes
> away. The qemu test suite even uses this mechanism on Linux (see
> PR_SET_PDEATHSIG in tests/qtest/libqtest.c).
>
> In nbdkit we have long had the concept of running nbdkit captively,
> and we have the nbdkit --exit-with-parent flag to help
> (https://libguestfs.org/nbdkit-captive.1.html#EXIT-WITH-PARENT)
>
> This commit adds the same mechanism. The syntax is:
>
> qemu -run-with exit-with-parent=on [...]
>
> This is not a feature that most typical users of qemu (for running
> general purpose, long-lived VMs) should use, so it defaults to off.
>
> The exit-with-parent.[ch] files are copied from nbdkit, where they
> have a 3-clause BSD license which is compatible with qemu:
>
> https://gitlab.com/nbdkit/nbdkit/-/tree/master/common/utils?ref_type=heads
>
> Thanks: Daniel P. Berrangé <berrange@redhat.com>
> Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
> ---
> include/qemu/exit-with-parent.h | 57 +++++++++++++
> qemu-options.hx | 13 ++-
> system/exit-with-parent.c | 140 ++++++++++++++++++++++++++++++++
> system/meson.build | 1 +
> system/vl.c | 13 +++
> 5 files changed, 222 insertions(+), 2 deletions(-)
>
> diff --git a/include/qemu/exit-with-parent.h b/include/qemu/exit-with-parent.h
> new file mode 100644
> index 0000000000..c00b863fe9
> --- /dev/null
> +++ b/include/qemu/exit-with-parent.h
> @@ -0,0 +1,57 @@
snip
> +
> +#ifndef NBDKIT_EXIT_WITH_PARENT_H
> +#define NBDKIT_EXIT_WITH_PARENT_H
I'd suggest s/NBDKIT/QEMU/ here & at the end
> +
> +/* Test if the feature is available on the platform. */
> +static inline bool can_exit_with_parent(void)
> +{
> +#if defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__)
> + return true;
> +#else
> + return false;
> +#endif
> +}
> +
> +/*
> + * --exit-with-parent: kill the current process if the parent exits.
> + * This may return -1 on error.
> + *
> + * Note this will abort on platforms where can_exit_with_parent()
> + * returned false.
> + */
> +extern int set_exit_with_parent(void);
> +
> +#endif /* NBDKIT_EXIT_WITH_PARENT_H */
With that minor change
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v2 2/2] tests/qtest: Use exit-with-parent=on in qtest invocations
2025-10-09 16:12 ` [PATCH v2 2/2] tests/qtest: Use exit-with-parent=on in qtest invocations Richard W.M. Jones
@ 2025-10-10 10:10 ` Daniel P. Berrangé
0 siblings, 0 replies; 5+ messages in thread
From: Daniel P. Berrangé @ 2025-10-10 10:10 UTC (permalink / raw)
To: Richard W.M. Jones; +Cc: qemu-devel, lvivier, farosas, pbonzini
On Thu, Oct 09, 2025 at 05:12:47PM +0100, Richard W.M. Jones wrote:
> Previously libqtest.c set PR_SET_PDEATHSIG (or the equivalent on
> FreeBSD) after forking the qemu subprocess. However we can get the
> same behaviour now by using the new -run-with exit-with-parent=on
> flag, on platforms that support it.
Perhaps note
"This conversion extends the qtest auto-cleanup to macOS"
>
> Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
> ---
> tests/qtest/libqtest.c | 22 ++++------------------
> 1 file changed, 4 insertions(+), 18 deletions(-)
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
^ permalink raw reply [flat|nested] 5+ messages in thread
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