diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h index 0695d7c3de196aa745192a3812b9df04744a4fe7..f51ff693e9628d1af24c2b124cb1618fa8268d54 100644 --- a/include/migration/vmstate.h +++ b/include/migration/vmstate.h @@ -820,6 +820,8 @@ int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd, void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd, void *opaque, QJSON *vmdesc); +bool vmstate_save_needed(const VMStateDescription *vmsd, void *opaque); + int vmstate_register_with_alias_id(DeviceState *dev, int instance_id, const VMStateDescription *vmsd, void *base, int alias_id, diff --git a/migration/savevm.c b/migration/savevm.c index 1a9b00b32035c8faa9bf342b2a7c9bee59b2c465..e779c96ef954cd77c4d02852abb584831ebb221c 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -836,6 +836,11 @@ void qemu_savevm_state_complete(QEMUFile *f) if ((!se->ops || !se->ops->save_state) && !se->vmsd) { 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); 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) { continue; } + if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) { + continue; + } save_section_header(f, se, QEMU_VM_SECTION_FULL); diff --git a/migration/vmstate.c b/migration/vmstate.c index 6138d1acb7b21c67a1ce0799fd9ea85ecc1496fa..e8ccf22f6784b78245eb852a9c3da1091832e807 100644 --- a/migration/vmstate.c +++ b/migration/vmstate.c @@ -276,6 +276,17 @@ static void vmsd_desc_field_end(const VMStateDescription *vmsd, QJSON *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 *opaque, QJSON *vmdesc) { diff --git a/trace-events b/trace-events index c0111d0296337d03940ada42b7ccba5c7790cf09..2d395c59a96039d758fe586044f89ca3b3fe7a1f 100644 --- a/trace-events +++ b/trace-events @@ -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" 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_skip(const char *id, unsigned int section_id) "%s, section_id %u" savevm_state_begin(void) "" savevm_state_header(void) "" savevm_state_iterate(void) ""