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f5c34ed088
Upcall is a direct communication tool between VMM and guest developed upon vsock. The server side of the upcall is a driver in guest kernel (kernel patches are needed for this feature) and it'll start to serve the requests after the kernel starts. And the client side is in Dragonball VMM , it'll be a thread that communicates with vsock through uds. We want to keep the lightweight of the VM through the implementation of the upcall, through which we could achieve vCPU hotplug, virtio-mmio hotplug without implementing complex and heavy virtualization features such as ACPI virtualization. fixes: #5642 Signed-off-by: Chao Wu <chaowu@linux.alibaba.com>