[v9] Live Update

[PATCH V9 20/46] vl: helper to request re-exec

Steve Sistare posted 46 patches 3 years, 1 month ago

Diff against v1 v2 v3 v4 v5 v6 v7 v8
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Maintainers: Stefano Stabellini <sstabellini@kernel.org>, Anthony Perard <anthony.perard@citrix.com>, Paul Durrant <paul@xen.org>, David Hildenbrand <david@redhat.com>, Igor Mammedov <imammedo@redhat.com>, Stefan Berger <stefanb@linux.vnet.ibm.com>, Stefan Hajnoczi <stefanha@redhat.com>, "Denis V. Lunev" <den@openvz.org>, Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>, Kevin Wolf <kwolf@redhat.com>, Hanna Reitz <hreitz@redhat.com>, Stefan Weil <sw@weilnetz.de>, Jeff Cody <codyprime@gmail.com>, Fam Zheng <fam@euphon.net>, "Marc-André Lureau" <marcandre.lureau@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, "Alex Bennée" <alex.bennee@linaro.org>, "Philippe Mathieu-Daudé" <f4bug@amsat.org>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, Greg Kurz <groug@kaod.org>, Christian Schoenebeck <qemu_oss@crudebyte.com>, "Daniel P. Berrangé" <berrange@redhat.com>, Eduardo Habkost <eduardo@habkost.net>, Gerd Hoffmann <kraxel@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>, Peter Maydell <peter.maydell@linaro.org>, Jason Wang <jasowang@redhat.com>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, "Cédric Le Goater" <clg@kaod.org>, Daniel Henrique Barboza <danielhb413@gmail.com>, David Gibson <david@gibson.dropbear.id.au>, Elena Ufimtseva <elena.ufimtseva@oracle.com>, Jagannathan Raman <jag.raman@oracle.com>, John G Johnson <john.g.johnson@oracle.com>, Halil Pasic <pasic@linux.ibm.com>, Christian Borntraeger <borntraeger@linux.ibm.com>, Eric Farman <farman@linux.ibm.com>, Richard Henderson <richard.henderson@linaro.org>, Cornelia Huck <cohuck@redhat.com>, Thomas Huth <thuth@redhat.com>, Alex Williamson <alex.williamson@redhat.com>, Steve Sistare <steven.sistare@oracle.com>, Mark Kanda <mark.kanda@oracle.com>, Peter Xu <peterx@redhat.com>, Juan Quintela <quintela@redhat.com>, Markus Armbruster <armbru@redhat.com>, Michael Roth <michael.roth@amd.com>, John Snow <jsnow@redhat.com>, Cleber Rosa <crosa@redhat.com>, Beraldo Leal <bleal@redhat.com>, Eric Blake <eblake@redhat.com>, Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>, Marcelo Tosatti <mtosatti@redhat.com>, Kamil Rytarowski <kamil@netbsd.org>, Reinoud Zandijk <reinoud@netbsd.org>, Sunil Muthuswamy <sunilmut@microsoft.com>, Wainer dos Santos Moschetta <wainersm@redhat.com>

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[PATCH V9 20/46] vl: helper to request re-exec

Posted by Steve Sistare 3 years, 1 month ago

Add a qemu_system_exec_request() hook that causes the main loop to exit and
re-exec qemu using the specified arguments.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
---
 include/sysemu/runstate.h |  1 +
 softmmu/runstate.c        | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/include/sysemu/runstate.h b/include/sysemu/runstate.h
index f3ed525..a5f0738 100644
--- a/include/sysemu/runstate.h
+++ b/include/sysemu/runstate.h
@@ -62,6 +62,7 @@ void qemu_system_wakeup_enable(WakeupReason reason, bool enabled);
 void qemu_register_wakeup_notifier(Notifier *notifier);
 void qemu_register_wakeup_support(void);
 void qemu_system_shutdown_request(ShutdownCause reason);
+void qemu_system_exec_request(const strList *args);
 void qemu_system_powerdown_request(void);
 void qemu_register_powerdown_notifier(Notifier *notifier);
 void qemu_register_shutdown_notifier(Notifier *notifier);
diff --git a/softmmu/runstate.c b/softmmu/runstate.c
index 168e1b7..14b43df 100644
--- a/softmmu/runstate.c
+++ b/softmmu/runstate.c
@@ -37,6 +37,7 @@
 #include "monitor/monitor.h"
 #include "net/net.h"
 #include "net/vhost_net.h"
+#include "qapi/util.h"
 #include "qapi/error.h"
 #include "qapi/qapi-commands-run-state.h"
 #include "qapi/qapi-events-run-state.h"
@@ -353,6 +354,7 @@ static NotifierList wakeup_notifiers =
 static NotifierList shutdown_notifiers =
     NOTIFIER_LIST_INITIALIZER(shutdown_notifiers);
 static uint32_t wakeup_reason_mask = ~(1 << QEMU_WAKEUP_REASON_NONE);
+static GStrv exec_argv;
 
 ShutdownCause qemu_shutdown_requested_get(void)
 {
@@ -369,6 +371,11 @@ static int qemu_shutdown_requested(void)
     return qatomic_xchg(&shutdown_requested, SHUTDOWN_CAUSE_NONE);
 }
 
+static int qemu_exec_requested(void)
+{
+    return exec_argv != NULL;
+}
+
 static void qemu_kill_report(void)
 {
     if (!qtest_driver() && shutdown_signal) {
@@ -627,6 +634,13 @@ void qemu_system_shutdown_request(ShutdownCause reason)
     qemu_notify_event();
 }
 
+void qemu_system_exec_request(const strList *args)
+{
+    exec_argv = strv_from_strList(args);
+    shutdown_requested = 1;
+    qemu_notify_event();
+}
+
 static void qemu_system_powerdown(void)
 {
     qapi_event_send_powerdown();
@@ -675,6 +689,16 @@ static bool main_loop_should_exit(void)
     }
     request = qemu_shutdown_requested();
     if (request) {
+
+        if (qemu_exec_requested()) {
+            Error *err = NULL;
+            execvp(exec_argv[0], exec_argv);
+            error_setg_errno(&err, errno, "execvp %s failed", exec_argv[0]);
+            error_report_err(err);
+            g_strfreev(exec_argv);
+            exec_argv = NULL;
+            return false;
+        }
         qemu_kill_report();
         qemu_system_shutdown(request);
         if (shutdown_action == SHUTDOWN_ACTION_PAUSE) {
-- 
1.8.3.1