xemu-project/xemu
1
0
Fork 0
mirror of https://github.com/xemu-project/xemu.git synced 2024-12-03 17:11:01 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

migration: Add post_save function to VMStateDescription

Browse Source 
In some cases it may be helpful to modify state before saving it for
migration, and then modify the state back after it has been saved. The
existing pre_save function provides half of this functionality. This
patch adds a post_save function to provide the second half.

Signed-off-by: Aaron Lindsay <aclindsa@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-id: 20181211151945.29137-2-aaron@os.amperecomputing.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Aaron Lindsay 2019-01-21 10:23:13 +00:00 committed by Peter Maydell
parent 8733d762d5
commit 8c07559fc7
3 changed files with 20 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
docs/devel/migration.rst
View File

@ -419,8 +419,13 @@ The functions to do that are inside a vmstate definition, and are called:
This function is called before we save the state of one device.
Example: You can look at hpet.c, that uses the three function to
massage the state that is transferred.
- ``int (*post_save)(void *opaque);``
This function is called after we save the state of one device
(even upon failure, unless the call to pre_save returned an error).
Example: You can look at hpet.c, that uses the first three functions
to massage the state that is transferred.
The ``VMSTATE_WITH_TMP`` macro may be useful when the migration
data doesn't match the stored device data well; it allows an

1
include/migration/vmstate.h
View File

@ -185,6 +185,7 @@ struct VMStateDescription {
int (*pre_load)(void *opaque);
int (*post_load)(void *opaque, int version_id);
int (*pre_save)(void *opaque);
int (*post_save)(void *opaque);
bool (*needed)(void *opaque);
const VMStateField *fields;
const VMStateDescription **subsections;

13
migration/vmstate.c
View File

@ -390,6 +390,9 @@ int vmstate_save_state_v(QEMUFile *f, const VMStateDescription *vmsd,
if (ret) {
error_report("Save of field %s/%s failed",
vmsd->name, field->name);
if (vmsd->post_save) {
vmsd->post_save(opaque);
}
return ret;
}
@ -415,7 +418,15 @@ int vmstate_save_state_v(QEMUFile *f, const VMStateDescription *vmsd,
json_end_array(vmdesc);
}
return vmstate_subsection_save(f, vmsd, opaque, vmdesc);
ret = vmstate_subsection_save(f, vmsd, opaque, vmdesc);
if (vmsd->post_save) {
int ps_ret = vmsd->post_save(opaque);
if (!ret) {
ret = ps_ret;
}
}
return ret;
}
static const VMStateDescription *