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vfio/migration: Report only stop-copy size in vfio_state_pending_exact()

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vfio_state_pending_exact() is used to update migration core how much
device data is left for the device migration. Currently, the sum of
pre-copy and stop-copy sizes of the VFIO device are reported.

The pre-copy size is obtained via the VFIO_MIG_GET_PRECOPY_INFO ioctl,
which returns the amount of device data available to be transferred
while the device is in the PRE_COPY states.

The stop-copy size is obtained via the VFIO_DEVICE_FEATURE_MIG_DATA_SIZE
ioctl, which returns the total amount of device data left to be
transferred in order to complete the device migration.

According to the above, current implementation is wrong -- it reports
extra overlapping data because pre-copy size is already contained in
stop-copy size. Fix it by reporting only stop-copy size.

Fixes: eda7362af9 ("vfio/migration: Add VFIO migration pre-copy support")
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
(cherry picked from commit 3b5948f808)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Avihai Horon 2024-10-20 16:01:06 +03:00 • committed by Michael Tokarev
parent 7ab3aff995
commit fd5ec4709d
1 changed files with 0 additions and 3 deletions
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3
hw/vfio/migration.c
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@ -480,9 +480,6 @@ static void vfio_state_pending_exact(void *opaque, uint64_t *must_precopy,
if (vfio_device_state_is_precopy(vbasedev)) {
vfio_query_precopy_size(migration);
*must_precopy +=
migration->precopy_init_size + migration->precopy_dirty_size;
}
trace_vfio_state_pending_exact(vbasedev->name, *must_precopy, *can_postcopy,