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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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2
include/hw/vfio/vfio-common.h
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@ -91,6 +91,7 @@ typedef struct VFIOMigration {
uint64_t mig_flags;
uint64_t precopy_init_size;
uint64_t precopy_dirty_size;
bool multifd_transfer;
VFIOMultifd *multifd;
bool initial_data_sent;
@ -153,6 +154,7 @@ typedef struct VFIODevice {
bool no_mmap;
bool ram_block_discard_allowed;
OnOffAuto enable_migration;
OnOffAuto migration_multifd_transfer;
bool migration_events;
VFIODeviceOps *ops;
unsigned int num_irqs;