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Explore the challenges and solutions in making QEMU's block layer thread-safe to support true parallel processing of multiple queues for devices like virtio-blk and virtio-scsi. Dive into a 31-minute KVM Forum talk that uncovers the complexities of coroutines, nested event loops, block node draining, and locks. Learn how developers are working to fulfill the promise of improved performance during heavy I/O by enabling genuine parallel queue processing in QEMU's block layer, moving beyond the current single-threaded implementation.
