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In the source code of qemu or linux, there is a check for the virtio version /* Check device version */ priv->version = readl(priv->base + VIRTIO_MMIO_VERSION); if (priv->version < 1 || priv->version > 2) { debug("(%s): version %d not supported!\n", udev->name, priv->version); return 0; } /* Check device ID */ uc_priv->device = readl(priv->base + VIRTIO_MMIO_DEVICE_ID); if (uc_priv->device == 0) { /* * virtio-mmio device with an ID 0 is a (dummy) placeholder * with no function. End probing now with no error reported. */ return 0; } Signed-off-by: wangmingrong1 <[email protected]>
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