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migration: Flush migration channel after sending data of CMD_PACKAGED

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If the length of the data sent after CMD_PACKAGED is just right, and
there is not much data to send afterward, it is possible part of the
CMD_PACKAGED payload will get left behind in the sending buffer. This
causes the destination side to hang while it tries to load the whole
package and initiate postcopy.

Signed-off-by: Juraj Marcin <jmarcin@redhat.com>
Link: https://lore.kernel.org/r/20251103183301.3840862-2-jmarcin@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Juraj Marcin 2025-11-03 19:32:50 +01:00 • committed by Peter Xu
parent c0c6a6ac7b
commit 1529ec8f5f
1 changed files with 1 additions and 0 deletions
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migration/savevm.c
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@ -1142,6 +1142,7 @@ int qemu_savevm_send_packaged(QEMUFile *f, const uint8_t *buf, size_t len)
qemu_savevm_command_send(f, MIG_CMD_PACKAGED, 4, (uint8_t *)&tmp);
qemu_put_buffer(f, buf, len);
qemu_fflush(f);
return 0;
}