Support querying migration progress #823
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QEMU relies on two VFIO mechanisms for retrieving estimated remaining data for a migration copy: * For devices that support precopy, the VFIO_MIG_GET_PRECOPY_INFO ioctl to estimate the numbers specific to precopy. * For all devices, the VFIO_DEVICE_FEATURE_MIG_DATA_SIZE device feature gives an estimate of data that needs to be stop copied. This patch adds equivalents to vfio-user (VFIO_USER_MIG_GET_PRECOPY_INFO and VFIO_DEVICE_FEATURE_MIG_DATA_SIZE), so that the QEMU client can use more seamlessly use the existing VFIO migration logic for vfio-user devices. Device backends must now implement two additional migration callbacks corresponding to the new requests if they support migration.
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QEMU relies on two VFIO mechanisms for retrieving estimated remaining data for a migration copy:
This patch adds equivalents to vfio-user (VFIO_USER_MIG_GET_PRECOPY_INFO and VFIO_DEVICE_FEATURE_MIG_DATA_SIZE), so that the QEMU client can use more seamlessly use the existing VFIO migration logic for vfio-user devices.
Device backends must now implement two additional migration callbacks corresponding to the new requests if they support migration.
closes #822