diff options
| author | Maciej S. Szmigiero <maciej.szmigiero@oracle.com> | 2025-03-04 23:03:58 +0100 |
|---|---|---|
| committer | Cédric Le Goater <clg@redhat.com> | 2025-03-06 06:47:34 +0100 |
| commit | 623af41dd331d1a57a41bc3374e3d134adb33f4c (patch) | |
| tree | e78c17d5700329f110f707a197a72dbcd78bba51 /hw | |
| parent | 6d644baef20303fa4b2b342f556e26c2262b439f (diff) | |
| download | focaccia-qemu-623af41dd331d1a57a41bc3374e3d134adb33f4c.tar.gz focaccia-qemu-623af41dd331d1a57a41bc3374e3d134adb33f4c.zip | |
vfio/migration: Add x-migration-multifd-transfer VFIO property
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>
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/vfio/migration-multifd.c | 18 | ||||
| -rw-r--r-- | hw/vfio/pci.c | 7 |
2 files changed, 24 insertions, 1 deletions
diff --git a/hw/vfio/migration-multifd.c b/hw/vfio/migration-multifd.c index bfb9a72fa4..aacddc503b 100644 --- a/hw/vfio/migration-multifd.c +++ b/hw/vfio/migration-multifd.c @@ -476,18 +476,34 @@ bool vfio_multifd_transfer_supported(void) bool vfio_multifd_transfer_enabled(VFIODevice *vbasedev) { - return false; + VFIOMigration *migration = vbasedev->migration; + + return migration->multifd_transfer; } bool vfio_multifd_setup(VFIODevice *vbasedev, bool alloc_multifd, Error **errp) { VFIOMigration *migration = vbasedev->migration; + if (vbasedev->migration_multifd_transfer == ON_OFF_AUTO_AUTO) { + migration->multifd_transfer = vfio_multifd_transfer_supported(); + } else { + migration->multifd_transfer = + vbasedev->migration_multifd_transfer == ON_OFF_AUTO_ON; + } + if (!vfio_multifd_transfer_enabled(vbasedev)) { /* Nothing further to check or do */ return true; } + if (!vfio_multifd_transfer_supported()) { + error_setg(errp, + "%s: Multifd device transfer requested but unsupported in the current config", + vbasedev->name); + return false; + } + if (alloc_multifd) { assert(!migration->multifd); migration->multifd = vfio_multifd_new(); diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index c1cee280ae..1bbf15cea3 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -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 = { |