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Ensure all pending virtio activations (as triggered by MMIO write on the vCPU threads leading to a barrier wait) are completed before pausing the vCPUs as otherwise there will a deadlock with the VMM waiting for the vCPU to acknowledge it's pause and the vCPU waiting for the VMM to activate the device and release the barrier. Fixes: #3585 Signed-off-by: Rob Bradford <robert.bradford@intel.com>