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shutdown: Prepare for use of an enum in reset/shutdown_request

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We want to track why a guest was shutdown; in particular, being able
to tell the difference between a guest request (such as ACPI request)
and host request (such as SIGINT) will prove useful to libvirt.
Since all requests eventually end up changing shutdown_requested in
vl.c, the logical change is to make that value track the reason,
rather than its current 0/1 contents.

Since command-line options control whether a reset request is turned
into a shutdown request instead, the same treatment is given to
reset_requested.

This patch adds an internal enum ShutdownCause that describes reasons
that a shutdown can be requested, and changes qemu_system_reset() to
pass the reason through, although for now nothing is actually changed
with regards to what gets reported.  The enum could be exported via
QAPI at a later date, if deemed necessary, but for now, there has not
been a request to expose that much detail to end clients.

For the most part, we turn 0 into SHUTDOWN_CAUSE_NONE, and 1 into
SHUTDOWN_CAUSE_HOST_ERROR; the only specific case where we have enough
information right now to use a different value is when we are reacting
to a host signal.  It will take a further patch to edit all call-sites
that can trigger a reset or shutdown request to properly pass in any
other reasons; this patch includes TODOs to point such places out.

qemu_system_reset() trades its 'bool report' parameter for a
'ShutdownCause reason', with all non-zero values having the same
effect; this lets us get rid of the weird #defines for VMRESET_*
as synonyms for bools.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20170515214114.15442-3-eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Eric Blake 2017-05-15 16:41:11 -05:00 • committed by Markus Armbruster
parent 7af88279e4
commit aedbe19297
5 changed files with 58 additions and 29 deletions
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7
hw/i386/xen/xen-hvm.c
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@ -1089,11 +1089,14 @@ static void cpu_handle_ioreq(void *opaque)
* causes Xen to powerdown the domain.
*/
if (runstate_is_running()) {
ShutdownCause request;
if (qemu_shutdown_requested_get()) {
destroy_hvm_domain(false);
}
if (qemu_reset_requested_get()) {
qemu_system_reset(VMRESET_REPORT);
request = qemu_reset_requested_get();
if (request) {
qemu_system_reset(request);
destroy_hvm_domain(true);
}
}