Messages in this thread | | | From | Eugenio Pérez <> | Subject | [PATCH 0/2] Fix expected set_vq_state behavior on vdpa_sim | Date | Wed, 18 Jan 2023 17:43:57 +0100 |
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The use of set_vq_state is to indicate vdpa device the state of a virtqueue. In the case of split, it means the avail_idx. This is mandatory for use cases like live migration.
However, vdpa_sim reset the vq state at vdpasim_queue_ready since it calls vringh_init_iotlb.
Also, to starting from an used_idx different than 0 is needed in use cases like virtual machine migration. Not doing so and letting the caller set an avail idx different than 0 causes destination device to try to use old buffers that source driver already recover and are not available anymore.
This series fixes both problems allowing to migrate to a vdpa_sim_net device.
Eugenio Pérez (2): vdpa_sim: not reset state in vdpasim_queue_ready vringh: fetch used_idx from vring at vringh_init_iotlb
drivers/vdpa/vdpa_sim/vdpa_sim.c | 2 ++ drivers/vhost/vringh.c | 25 +++++++++++++++++++++++-- 2 files changed, 25 insertions(+), 2 deletions(-)
-- 2.31.1
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