Paravirtualization Above picture shows the I/O ring data st…
Paravirtualization Above picture shows the I/O ring data structure used in Xen to facilitate communication between the guest OS and Xen. Guest-OS places a request in the I/O ring using the “Request Producer” pointer. Xen places a response in the I/O ring using the “Response Producer” pointer. [1 point] A guest OS is polling the ring. What exact condition tells it that a response is available to consume, and what simple step should it take before reading the descriptor?
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