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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
Download patch file Download diff file Expand all files Collapse all files

6
hw/vfio/common.c
View file

@ -492,7 +492,8 @@ static bool vfio_devices_all_dirty_tracking(VFIOContainer *container)
}
if (vbasedev->pre_copy_dirty_page_tracking == ON_OFF_AUTO_OFF &&
migration->device_state == VFIO_DEVICE_STATE_RUNNING) {
(migration->device_state == VFIO_DEVICE_STATE_RUNNING ||
migration->device_state == VFIO_DEVICE_STATE_PRE_COPY)) {
return false;
}
}
@ -537,7 +538,8 @@ static bool vfio_devices_all_running_and_mig_active(VFIOContainer *container)
return false;
}
if (migration->device_state == VFIO_DEVICE_STATE_RUNNING) {
if (migration->device_state == VFIO_DEVICE_STATE_RUNNING ||
migration->device_state == VFIO_DEVICE_STATE_PRE_COPY) {
continue;
} else {
return false;