vfio/mlx5: Improve the target side flow to reduce downtime

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Improve the target side flow to reduce downtime as of below.

- Support reading an optional record which includes the expected
  stop_copy size.
- Once the source sends this record data, which expects to be sent as
  part of the pre_copy flow, prepare the data buffers that may be large
  enough to hold the final stop_copy data.

The above reduces the migration downtime as the relevant stuff that is
needed to load the image data is prepared ahead as part of pre_copy.

Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Link: https://lore.kernel.org/r/20230124144955.139901-4-yishaih@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

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Yishai Hadas 2023-01-24 16:49:55 +02:00 • committed by Alex Williamson

parent b04e2e86e9

commit f4f0c25e5d

2 changed files with 105 additions and 12 deletions

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6

drivers/vfio/pci/mlx5/cmd.h

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111

drivers/vfio/pci/mlx5/main.c

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