It was always used as 32bit, so define it as used to be clear.
Instead of using -1 as the auto-gen magic value, we switch to
UINT32_MAX. We also make sure that we don't auto-gen this value to
avoid overflowed instance IDs without being noticed.
Suggested-by: Juan Quintela <quint...@redhat.com>
Signed-off-by: Peter Xu <pet...@redhat.com>
---
hw/intc/apic_common.c | 2 +-
include/migration/register.h | 2 +-
include/migration/vmstate.h | 6 +++---
migration/savevm.c | 18 ++++++++++--------
stubs/vmstate.c | 2 +-
5 files changed, 16 insertions(+), 14 deletions(-)
diff --git a/hw/intc/apic_common.c b/hw/intc/apic_common.c
index 22da53ce8a..fabfa7320b 100644
--- a/hw/intc/apic_common.c
+++ b/hw/intc/apic_common.c
@@ -315,7 +315,7 @@ static void apic_common_realize(DeviceState *dev, Error
**errp)
APICCommonState *s = APIC_COMMON(dev);
APICCommonClass *info;
static DeviceState *vapic;
- int instance_id = s->id;
+ uint32_t instance_id = s->id;
info = APIC_COMMON_GET_CLASS(s);
info->realize(dev, errp);
diff --git a/include/migration/register.h b/include/migration/register.h
index a13359a08d..f3ba10b6ef 100644
--- a/include/migration/register.h
+++ b/include/migration/register.h
@@ -69,7 +69,7 @@ typedef struct SaveVMHandlers {
} SaveVMHandlers;
int register_savevm_live(const char *idstr,
- int instance_id,
+ uint32_t instance_id,
int version_id,
const SaveVMHandlers *ops,
void *opaque);
diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index c551470299..67bc63e30e 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -1113,17 +1113,17 @@ int vmstate_save_state_v(QEMUFile *f, const
VMStateDescription *vmsd,
bool vmstate_save_needed(const VMStateDescription *vmsd, void *opaque);
-#define VMSTATE_INSTANCE_ID_ANY -1
+#define VMSTATE_INSTANCE_ID_ANY UINT32_MAX
/* Returns: 0 on success, -1 on failure */
-int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
+int vmstate_register_with_alias_id(DeviceState *dev, uint32_t instance_id,
const VMStateDescription *vmsd,
void *base, int alias_id,
int required_for_version,
Error **errp);
/* Returns: 0 on success, -1 on failure */
-static inline int vmstate_register(DeviceState *dev, int instance_id,
+static inline int vmstate_register(DeviceState *dev, uint32_t instance_id,
const VMStateDescription *vmsd,
void *opaque)
{
diff --git a/migration/savevm.c b/migration/savevm.c
index 0074572a52..1e44f06d7a 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -233,7 +233,7 @@ typedef struct CompatEntry {
typedef struct SaveStateEntry {
QTAILQ_ENTRY(SaveStateEntry) entry;
char idstr[256];
- int instance_id;
+ uint32_t instance_id;
int alias_id;
int version_id;
/* version id read from the stream */
@@ -665,10 +665,10 @@ void dump_vmstate_json_to_file(FILE *out_file)
fclose(out_file);
}
-static int calculate_new_instance_id(const char *idstr)
+static uint32_t calculate_new_instance_id(const char *idstr)
{
SaveStateEntry *se;
- int instance_id = 0;
+ uint32_t instance_id = 0;
QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
if (strcmp(idstr, se->idstr) == 0
@@ -676,6 +676,8 @@ static int calculate_new_instance_id(const char *idstr)
instance_id = se->instance_id + 1;
}
}
+ /* Make sure we never loop over without being noticed */
+ assert(instance_id != VMSTATE_INSTANCE_ID_ANY);
return instance_id;
}
@@ -730,7 +732,7 @@ static void savevm_state_handler_insert(SaveStateEntry *nse)
Meanwhile pass -1 as instance_id if you do not already have a clearly
distinguishing id for all instances of your device class. */
int register_savevm_live(const char *idstr,
- int instance_id,
+ uint32_t instance_id,
int version_id,
const SaveVMHandlers *ops,
void *opaque)
@@ -784,7 +786,7 @@ void unregister_savevm(DeviceState *dev, const char *idstr,
void *opaque)
}
}
-int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
+int vmstate_register_with_alias_id(DeviceState *dev, uint32_t instance_id,
const VMStateDescription *vmsd,
void *opaque, int alias_id,
int required_for_version,
@@ -1566,7 +1568,7 @@ int qemu_save_device_state(QEMUFile *f)
return qemu_file_get_error(f);
}
-static SaveStateEntry *find_se(const char *idstr, int instance_id)
+static SaveStateEntry *find_se(const char *idstr, uint32_t instance_id)
{
SaveStateEntry *se;
@@ -2235,7 +2237,7 @@ qemu_loadvm_section_start_full(QEMUFile *f,
MigrationIncomingState *mis)
/* Find savevm section */
se = find_se(idstr, instance_id);
if (se == NULL) {
- error_report("Unknown savevm section or instance '%s' %d. "
+ error_report("Unknown savevm section or instance '%s' %"PRIu32". "
"Make sure that your current VM setup matches your "
"saved VM setup, including any hotplugged devices",
idstr, instance_id);
@@ -2259,7 +2261,7 @@ qemu_loadvm_section_start_full(QEMUFile *f,
MigrationIncomingState *mis)
ret = vmstate_load(f, se);
if (ret < 0) {
- error_report("error while loading state for instance 0x%x of"
+ error_report("error while loading state for instance 0x%"PRIx32" of"
" device '%s'", instance_id, idstr);
return ret;
}
diff --git a/stubs/vmstate.c b/stubs/vmstate.c
index e1e89b87f0..4ed5cc6e9e 100644
--- a/stubs/vmstate.c
+++ b/stubs/vmstate.c
@@ -4,7 +4,7 @@
const VMStateDescription vmstate_dummy = {};
int vmstate_register_with_alias_id(DeviceState *dev,
- int instance_id,
+ uint32_t instance_id,
const VMStateDescription *vmsd,
void *base, int alias_id,
int required_for_version,
--
2.21.0
