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Currently, the code waits in a busy loop on every admin virtqueue issued command to get a reply. That prevents callers from issuing multiple commands in parallel. To overcome this limitation, introduce a virtqueue event callback for admin virtqueue. For every issued command, use completion mechanism to wait on a reply. In the event callback, trigger the completion is done for every incoming reply. Alongside with that, introduce a spin lock to protect the admin virtqueue operations. Signed-off-by: Jiri Pirko <jiri@nvidia.com> Message-Id: <20240716113552.80599-13-jiri@resnulli.us> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>