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migration: Add qemu_loadvm_load_state_buffer() and its handler

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qemu_loadvm_load_state_buffer() and its load_state_buffer
SaveVMHandler allow providing device state buffer to explicitly
specified device via its idstr and instance id.

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Link: https://lore.kernel.org/qemu-devel/71ca753286b87831ced4afd422e2e2bed071af25.1741124640.git.maciej.szmigiero@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Maciej S. Szmigiero 2025-03-04 23:03:33 +01:00 • committed by Cédric Le Goater
parent 4e55cb3cde
commit a30363db08
3 changed files with 41 additions and 0 deletions
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23
migration/savevm.c
View file

@ -3060,6 +3060,29 @@ int qemu_loadvm_approve_switchover(void)
return migrate_send_rp_switchover_ack(mis);
}
bool qemu_loadvm_load_state_buffer(const char *idstr, uint32_t instance_id,
char *buf, size_t len, Error **errp)
{
SaveStateEntry *se;
se = find_se(idstr, instance_id);
if (!se) {
error_setg(errp,
"Unknown idstr %s or instance id %u for load state buffer",
idstr, instance_id);
return false;
}
if (!se->ops || !se->ops->load_state_buffer) {
error_setg(errp,
"idstr %s / instance %u has no load state buffer operation",
idstr, instance_id);
return false;
}
return se->ops->load_state_buffer(se->opaque, buf, len, errp);
}
bool save_snapshot(const char *name, bool overwrite, const char *vmstate,
bool has_devices, strList *devices, Error **errp)
{

3
migration/savevm.h
View file

@ -71,4 +71,7 @@ int qemu_loadvm_approve_switchover(void);
int qemu_savevm_state_complete_precopy_non_iterable(QEMUFile *f,
bool in_postcopy);
bool qemu_loadvm_load_state_buffer(const char *idstr, uint32_t instance_id,
char *buf, size_t len, Error **errp);
#endif