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vfio/migration: Add VFIO migration pre-copy support

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Pre-copy support allows the VFIO device data to be transferred while the
VM is running. This helps to accommodate VFIO devices that have a large
amount of data that needs to be transferred, and it can reduce migration
downtime.

Pre-copy support is optional in VFIO migration protocol v2.
Implement pre-copy of VFIO migration protocol v2 and use it for devices
that support it. Full description of it can be found in the following
Linux commit: 4db52602a607 ("vfio: Extend the device migration protocol
with PRE_COPY").

Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Tested-by: YangHang Liu <yanghliu@redhat.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Avihai Horon 2023-06-21 14:12:00 +03:00 • committed by Cédric Le Goater
parent 6cd1fe1159
commit eda7362af9
5 changed files with 190 additions and 22 deletions
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2
include/hw/vfio/vfio-common.h
View file

@ -67,6 +67,8 @@ typedef struct VFIOMigration {
void *data_buffer;
size_t data_buffer_size;
uint64_t mig_flags;
uint64_t precopy_init_size;
uint64_t precopy_dirty_size;
} VFIOMigration;
typedef struct VFIOAddressSpace {