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migration: lower handler priority

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Define a vmstate priority that is lower than the default, so its handlers
run after all default priority handlers.  Since 0 is no longer the default
priority, translate an uninitialized priority of 0 to MIG_PRI_DEFAULT.

CPR for vfio will use this to install handlers for containers that run
after handlers for the devices that they contain.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-3-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Steve Sistare 2025-06-10 08:39:15 -07:00 • committed by Cédric Le Goater
parent f95fd60ac1
commit 081c09dc52
2 changed files with 7 additions and 3 deletions
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6
include/migration/vmstate.h
View file

@ -155,7 +155,11 @@ enum VMStateFlags {
};
typedef enum {
MIG_PRI_DEFAULT = 0,
MIG_PRI_UNINITIALIZED = 0, /* An uninitialized priority field maps to */
/* MIG_PRI_DEFAULT in save_state_priority */
MIG_PRI_LOW, /* Must happen after default */
MIG_PRI_DEFAULT,
MIG_PRI_IOMMU, /* Must happen before PCI devices */
MIG_PRI_PCI_BUS, /* Must happen before IOMMU */
MIG_PRI_VIRTIO_MEM, /* Must happen before IOMMU */

4
migration/savevm.c
View file

@ -266,7 +266,7 @@ typedef struct SaveState {
static SaveState savevm_state = {
.handlers = QTAILQ_HEAD_INITIALIZER(savevm_state.handlers),
.handler_pri_head = { [MIG_PRI_DEFAULT ... MIG_PRI_MAX] = NULL },
.handler_pri_head = { [0 ... MIG_PRI_MAX] = NULL },
.global_section_id = 0,
};
@ -737,7 +737,7 @@ static int calculate_compat_instance_id(const char *idstr)
static inline MigrationPriority save_state_priority(SaveStateEntry *se)
{
if (se->vmsd) {
if (se->vmsd && se->vmsd->priority) {
return se->vmsd->priority;
}
return MIG_PRI_DEFAULT;