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7966d70f6f
Snapshot loading only expects to call deterministic handlers, not non-deterministic ones. So introduce a way of registering handlers that won't be called when reseting for snapshots. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Message-id: 20221025004327.568476-2-Jason@zx2c4.com [PMM: updated json doc comment with Markus' text; fixed checkpatch style nit] Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
/*
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* Reset handlers.
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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* Copyright (c) 2016 Red Hat, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qemu/queue.h"
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#include "sysemu/reset.h"
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/* reset/shutdown handler */
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typedef struct QEMUResetEntry {
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QTAILQ_ENTRY(QEMUResetEntry) entry;
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QEMUResetHandler *func;
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void *opaque;
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bool skip_on_snapshot_load;
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} QEMUResetEntry;
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static QTAILQ_HEAD(, QEMUResetEntry) reset_handlers =
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QTAILQ_HEAD_INITIALIZER(reset_handlers);
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void qemu_register_reset(QEMUResetHandler *func, void *opaque)
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{
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QEMUResetEntry *re = g_new0(QEMUResetEntry, 1);
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re->func = func;
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re->opaque = opaque;
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QTAILQ_INSERT_TAIL(&reset_handlers, re, entry);
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}
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void qemu_register_reset_nosnapshotload(QEMUResetHandler *func, void *opaque)
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{
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QEMUResetEntry *re = g_new0(QEMUResetEntry, 1);
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re->func = func;
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re->opaque = opaque;
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re->skip_on_snapshot_load = true;
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QTAILQ_INSERT_TAIL(&reset_handlers, re, entry);
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}
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void qemu_unregister_reset(QEMUResetHandler *func, void *opaque)
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{
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QEMUResetEntry *re;
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QTAILQ_FOREACH(re, &reset_handlers, entry) {
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if (re->func == func && re->opaque == opaque) {
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QTAILQ_REMOVE(&reset_handlers, re, entry);
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g_free(re);
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return;
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}
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}
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}
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void qemu_devices_reset(ShutdownCause reason)
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{
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QEMUResetEntry *re, *nre;
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/* reset all devices */
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QTAILQ_FOREACH_SAFE(re, &reset_handlers, entry, nre) {
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if (reason == SHUTDOWN_CAUSE_SNAPSHOT_LOAD &&
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re->skip_on_snapshot_load) {
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continue;
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}
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re->func(re->opaque);
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}
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}
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