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vfio/migration: Make x-migration-multifd-transfer VFIO property mutable

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DEFINE_PROP_ON_OFF_AUTO() property isn't runtime-mutable so using it
would mean that the source VM would need to decide upfront at startup
time whether it wants to do a multifd device state transfer at some
point.

Source VM can run for a long time before being migrated so it is
desirable to have a fallback mechanism to the old way of transferring
VFIO device state if it turns to be necessary.

This brings this property to the same mutability level as ordinary
migration parameters, which too can be adjusted at the run time.

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/f2f2d66bda477da3e6cb8c0311006cff36e8651d.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 23:03:59 +01:00 • committed by Cédric Le Goater
parent 623af41dd3
commit 4c765ceaac
2 changed files with 21 additions and 3 deletions
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4
hw/vfio/migration-multifd.c
View file

@ -485,6 +485,10 @@ bool vfio_multifd_setup(VFIODevice *vbasedev, bool alloc_multifd, Error **errp)
{
VFIOMigration *migration = vbasedev->migration;
/*
* Make a copy of this setting at the start in case it is changed
* mid-migration.
*/
if (vbasedev->migration_multifd_transfer == ON_OFF_AUTO_AUTO) {
migration->multifd_transfer = vfio_multifd_transfer_supported();
} else {