Hi, (I'm not subscribed to either list,)
using the word "descriptor" is misleading in the following sections: 2.4.1.2 Updating The Available Ring [...] However, in general we can add many descriptors before we update the idx fi eld (at which point they become visible to the device), so we keep a counter of how many we've added: [...] and 2.4.1.3 Updating The Index Field Once the idx fi eld of the virtqueue is updated, the device will be able to access the descriptor entries we've created and the memory they refer to. [...] (The word "descriptor" in the above language is the reason I mis-implemented the virtio-blk guest driver in OVMF.) In fact the available ring tracks *head* descriptors only. I suggest s/many descriptors/many separate descriptor chains/ s/descriptor entries/separate descriptor chains/ for the above. Similarly, 2.3.4 Available Ring should start with something like The available ring describes what descriptor chains we are offering the device: each entry of the available ring refers to the head descriptor of a separate descriptor chain. Thanks Laszlo _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
