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vfio/migration: Reset bytes_transferred properly

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Currently, VFIO bytes_transferred is not reset properly:
1. bytes_transferred is not reset after a VM snapshot (so a migration
   following a snapshot will report incorrect value).
2. bytes_transferred is a single counter for all VFIO devices, however
   upon migration failure it is reset multiple times, by each VFIO
   device.

Fix it by introducing a new function vfio_reset_bytes_transferred() and
calling it during migration and snapshot start.

Remove existing bytes_transferred reset in VFIO migration state
notifier, which is not needed anymore.

Fixes: 3710586caa ("qapi: Add VFIO devices migration stats in Migration stats")
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Avihai Horon 2023-06-28 10:31:11 +03:00 • committed by Cédric Le Goater
parent c174088923
commit 808642a2f6
6 changed files with 24 additions and 3 deletions
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1
migration/savevm.c
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@ -1622,6 +1622,7 @@ static int qemu_savevm_state(QEMUFile *f, Error **errp)
migrate_init(ms);
memset(&mig_stats, 0, sizeof(mig_stats));
memset(&compression_counters, 0, sizeof(compression_counters));
reset_vfio_bytes_transferred();
ms->to_dst_file = f;
qemu_mutex_unlock_iothread();