161 lines
13 KiB
XML
161 lines
13 KiB
XML
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<title id="diagram-title">control/setup path 는 QEMU 를 지나고 data path 는 backend 에 따라 QEMU 를 지나기도 안 지나기도 한다</title>
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<desc id="diagram-description">왼쪽에서 오른쪽으로 읽는다. 위쪽 줄이 control/setup path 다. virsh 에서 libvirt 와 QEMU 를 지나 virtio-net Device Model 에 닿고, 그 device model 이 virtual NIC 생성과 feature negotiation, virtqueue 설정, vhost-net backend 설정을 맡는다. 아래쪽 줄이 data path 다. Physical NIC 에서 Physical NIC Driver 와 Linux Bridge, TAP 까지 온다. 두 줄은 네 번째 열 다음에서 만난다. device model 은 점선으로 backend 둘을 설정하고, TAP 은 실선으로 그 둘 가운데 실제로 쓰는 쪽에 packet 을 넘긴다. vhost-net 을 쓰면 packet 은 Host Kernel 안에서 처리돼 QEMU 사용자 공간을 지나지 않고, QEMU virtio backend 를 쓰면 같은 packet 이 QEMU 사용자 공간을 지난다. 어느 쪽이든 virtqueue 에서 만나 Guest 로 올라간다. 이 Host 가 둘 중 어느 backend 를 쓰고 있는지는 그림이 말하지 않는다.</desc>
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