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vfio/migration: Emit VFIO migration QAPI event

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Emit VFIO migration QAPI event when a VFIO device changes its migration
state. This can be used by management applications to get updates on the
current state of the VFIO device for their own purposes.

A new per VFIO device capability, "migration-events", is added so events
can be enabled only for the required devices. It is disabled by default.

Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Avihai Horon 2024-05-15 16:21:36 +03:00 • committed by Cédric Le Goater
parent a0359b56ec
commit 5e1f8905ca
3 changed files with 59 additions and 3 deletions
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2
hw/vfio/pci.c
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@ -3388,6 +3388,8 @@ static Property vfio_pci_dev_properties[] = {
VFIO_FEATURE_ENABLE_IGD_OPREGION_BIT, false),
DEFINE_PROP_ON_OFF_AUTO("enable-migration", VFIOPCIDevice,
vbasedev.enable_migration, ON_OFF_AUTO_AUTO),
DEFINE_PROP_BOOL("migration-events", VFIOPCIDevice,
vbasedev.migration_events, false),
DEFINE_PROP_BOOL("x-no-mmap", VFIOPCIDevice, vbasedev.no_mmap, false),
DEFINE_PROP_BOOL("x-balloon-allowed", VFIOPCIDevice,
vbasedev.ram_block_discard_allowed, false),