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Introduce sysfs entries to provide visibility to the multiple queues used by the Virtio FS device. This enhancement allows users to query information about these queues. Specifically, add two sysfs entries: 1. Queue name: Provides the name of each queue (e.g. hiprio/requests.8). 2. CPU list: Shows the list of CPUs that can process requests for each queue. The CPU list feature is inspired by similar functionality in the block MQ layer, which provides analogous sysfs entries for block devices. These new sysfs entries will improve observability and aid in debugging and performance tuning of Virtio FS devices. Reviewed-by: Idan Zach <izach@nvidia.com> Reviewed-by: Shai Malin <smalin@nvidia.com> Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com> Message-Id: <20240825130716.9506-2-mgurtovoy@nvidia.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>