From 08fba7ac9b618516a5f1d096f78a7e2837fe0594 Mon Sep 17 00:00:00 2001 From: Eric Blake Date: Mon, 15 May 2017 16:41:14 -0500 Subject: shutdown: Expose bool cause in SHUTDOWN and RESET events Libvirt would like to be able to distinguish between a SHUTDOWN event triggered solely by guest request and one triggered by a SIGTERM or other action on the host. While qemu_kill_report() was already able to give different output to stderr based on whether a shutdown was triggered by a host signal (but NOT by a host UI event, such as clicking the X on the window), that information was then lost to management. The previous patches improved things to use an enum throughout all callsites, so now we have something ready to expose through QMP. Note that for now, the decision was to expose ONLY a boolean, rather than promoting ShutdownCause to a QAPI enum; this is because libvirt has not expressed an interest in anything finer-grained. We can still add additional details, in a backwards-compatible manner, if a need later arises (if the addition happens before 2.10, we can replace the bool with an enum; otherwise, the enum will have to be in addition to the bool); this patch merely adds a helper shutdown_caused_by_guest() to map the internal enum into the external boolean. Update expected iotest outputs to match the new data (complete coverage of the affected tests is obtained by -raw, -qcow2, and -nbd). Here is output from 'virsh qemu-monitor-event --loop' with the patch installed: event SHUTDOWN at 1492639680.731251 for domain fedora_13: {"guest":true} event STOP at 1492639680.732116 for domain fedora_13: event SHUTDOWN at 1492639680.732830 for domain fedora_13: {"guest":false} Note that libvirt runs qemu with -no-shutdown: the first SHUTDOWN event was triggered by an action I took directly in the guest (shutdown -h), at which point qemu stops the vcpus and waits for libvirt to do any final cleanups; the second SHUTDOWN event is the result of libvirt sending SIGTERM now that it has completed cleanup. Libvirt is already smart enough to only feed the first qemu SHUTDOWN event to the end user (remember, virsh qemu-monitor-event is a low-level debugging interface that is explicitly unsupported by libvirt, so it sees things that normal end users do not); changing qemu to emit SHUTDOWN only once is outside the scope of this series. See also https://bugzilla.redhat.com/1384007 Signed-off-by: Eric Blake Message-Id: <20170515214114.15442-6-eblake@redhat.com> Reviewed-by: Markus Armbruster Signed-off-by: Markus Armbruster --- vl.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'vl.c') diff --git a/vl.c b/vl.c index 1064fd117f..25e1fb4e9f 100644 --- a/vl.c +++ b/vl.c @@ -1705,8 +1705,8 @@ void qemu_system_reset(ShutdownCause reason) qemu_devices_reset(); } if (reason) { - /* TODO update event based on reason */ - qapi_event_send_reset(&error_abort); + qapi_event_send_reset(shutdown_caused_by_guest(reason), + &error_abort); } cpu_synchronize_all_post_reset(); } @@ -1863,8 +1863,8 @@ static bool main_loop_should_exit(void) request = qemu_shutdown_requested(); if (request) { qemu_kill_report(); - /* TODO update event based on request */ - qapi_event_send_shutdown(&error_abort); + qapi_event_send_shutdown(shutdown_caused_by_guest(request), + &error_abort); if (no_shutdown) { vm_stop(RUN_STATE_SHUTDOWN); } else { -- cgit v1.2.3