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vmstate: Create optional sections 

To make sections optional, we need to do it at the beggining of the code.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Juan Quintela 2014-10-15 09:39:14 +02:00
parent 13d16814d2
commit df8961522a
4 changed files with 22 additions and 0 deletions
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2
include/migration/vmstate.h
View File

@ -820,6 +820,8 @@ int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd, void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
void *opaque, QJSON *vmdesc); void *opaque, QJSON *vmdesc);
bool vmstate_save_needed(const VMStateDescription *vmsd, void *opaque);
int vmstate_register_with_alias_id(DeviceState *dev, int instance_id, int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
const VMStateDescription *vmsd, const VMStateDescription *vmsd,
void *base, int alias_id, void *base, int alias_id,

8
migration/savevm.c
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@ -836,6 +836,11 @@ void qemu_savevm_state_complete(QEMUFile *f)
if ((!se->ops || !se->ops->save_state) && !se->vmsd) { if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
continue; continue;
} }
if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) {
trace_savevm_section_skip(se->idstr, se->section_id);
continue;
}
trace_savevm_section_start(se->idstr, se->section_id); trace_savevm_section_start(se->idstr, se->section_id);
json_start_object(vmdesc, NULL); json_start_object(vmdesc, NULL);
@ -949,6 +954,9 @@ static int qemu_save_device_state(QEMUFile *f)
if ((!se->ops || !se->ops->save_state) && !se->vmsd) { if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
continue; continue;
} }
if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) {
continue;
}
save_section_header(f, se, QEMU_VM_SECTION_FULL); save_section_header(f, se, QEMU_VM_SECTION_FULL);

11
migration/vmstate.c
View File

@ -276,6 +276,17 @@ static void vmsd_desc_field_end(const VMStateDescription *vmsd, QJSON *vmdesc,
json_end_object(vmdesc); json_end_object(vmdesc);
} }
bool vmstate_save_needed(const VMStateDescription *vmsd, void *opaque)
{
if (vmsd->needed && !vmsd->needed(opaque)) {
/* optional section not needed */
return false;
}
return true;
}
void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd, void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
void *opaque, QJSON *vmdesc) void *opaque, QJSON *vmdesc)
{ {

1
trace-events
View File

@ -1191,6 +1191,7 @@ qemu_loadvm_state_section_partend(uint32_t section_id) "%u"
qemu_loadvm_state_section_startfull(uint32_t section_id, const char *idstr, uint32_t instance_id, uint32_t version_id) "%u(%s) %u %u" qemu_loadvm_state_section_startfull(uint32_t section_id, const char *idstr, uint32_t instance_id, uint32_t version_id) "%u(%s) %u %u"
savevm_section_start(const char *id, unsigned int section_id) "%s, section_id %u" savevm_section_start(const char *id, unsigned int section_id) "%s, section_id %u"
savevm_section_end(const char *id, unsigned int section_id, int ret) "%s, section_id %u -> %d" savevm_section_end(const char *id, unsigned int section_id, int ret) "%s, section_id %u -> %d"
savevm_section_skip(const char *id, unsigned int section_id) "%s, section_id %u"
savevm_state_begin(void) "" savevm_state_begin(void) ""
savevm_state_header(void) "" savevm_state_header(void) ""
savevm_state_iterate(void) "" savevm_state_iterate(void) ""