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migration: check pre_save return in vmstate_save_state

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Check the return value of pre_save state and fail vmstate_save_state
if the pre_save failed.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20170925112917.21340-3-dgilbert@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2017-09-25 12:29:13 +01:00
parent 44b1ff319c
commit 551dbd0846
3 changed files with 13 additions and 4 deletions
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4
include/migration/vmstate.h
View File

@ -994,8 +994,8 @@ extern const VMStateInfo vmstate_info_qtailq;
int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
void *opaque, int version_id);
void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
void *opaque, QJSON *vmdesc);
int vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
void *opaque, QJSON *vmdesc);
bool vmstate_save_needed(const VMStateDescription *vmsd, void *opaque);

1
migration/trace-events
View File

@ -40,6 +40,7 @@ savevm_state_iterate(void) ""
savevm_state_cleanup(void) ""
savevm_state_complete_precopy(void) ""
vmstate_save(const char *idstr, const char *vmsd_name) "%s, %s"
vmstate_save_state_pre_save_res(const char *name, int res) "%s/%d"
vmstate_save_state_loop(const char *name, const char *field, int n_elems) "%s/%s[%d]"
vmstate_save_state_top(const char *idstr) "%s"
vmstate_subsection_save_loop(const char *name, const char *sub) "%s/%s"

12
migration/vmstate.c
View File

@ -308,15 +308,21 @@ bool vmstate_save_needed(const VMStateDescription *vmsd, void *opaque)
}
void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
int vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
void *opaque, QJSON *vmdesc)
{
int ret = 0;
VMStateField *field = vmsd->fields;
trace_vmstate_save_state_top(vmsd->name);
if (vmsd->pre_save) {
vmsd->pre_save(opaque);
ret = vmsd->pre_save(opaque);
trace_vmstate_save_state_pre_save_res(vmsd->name, ret);
if (ret) {
error_report("pre-save failed: %s", vmsd->name);
return ret;
}
}
if (vmdesc) {
@ -381,6 +387,8 @@ void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
}
vmstate_subsection_save(f, vmsd, opaque, vmdesc);
return 0;
}
static const VMStateDescription *