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vfio/migration: Add x-migration-multifd-transfer VFIO property

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This property allows configuring whether to transfer the particular device
state via multifd channels when live migrating that device.

It defaults to AUTO, which means that VFIO device state transfer via
multifd channels is attempted in configurations that otherwise support it.

Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/d6dbb326e3d53c7104d62c96c9e3dd64e1c7b940.1741124640.git.maciej.szmigiero@oracle.com
[ clg: Added documentation ]
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Maciej S. Szmigiero 2025-03-04 23:03:58 +01:00 • committed by Cédric Le Goater
parent 6d644baef2
commit 623af41dd3
4 changed files with 41 additions and 1 deletions
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7
hw/vfio/pci.c
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@ -3381,6 +3381,9 @@ static const 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_ON_OFF_AUTO("x-migration-multifd-transfer", VFIOPCIDevice,
vbasedev.migration_multifd_transfer,
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),
@ -3553,6 +3556,10 @@ static void vfio_pci_dev_class_init(ObjectClass *klass, void *data)
"Skip config space check for Vendor Specific Capability. "
"Setting to false will enforce strict checking of VSC content "
"(DEBUG)");
object_class_property_set_description(klass, /* 10.0 */
"x-migration-multifd-transfer",
"Transfer this device state via "
"multifd channels when live migrating it");
}
static const TypeInfo vfio_pci_dev_info = {