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[Stable-9.0.4,33/57] vfio/migration: Report only stop-copy size in vfio_state_pending_exact()

Message ID 20241109120801.3295120-33-mjt@tls.msk.ru (mailing list archive)
State New
Headers show
Series Patch Round-up for stable 9.0.4, freeze on 2024-11-18 | expand

Commit Message

Michael Tokarev Nov. 9, 2024, 12:07 p.m. UTC 
From: Avihai Horon <avihaih@nvidia.com>

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: eda7362af959 ("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 3b5948f808e3b99aedfa0aff45cffbe8b7ec07ed)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff mbox series

Patch

diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index 1149c6b374..3a97d56950 100644
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -486,9 +486,6 @@  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,