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Subject: virtio and endian-ness
During the last TC meeting, we discussed making virtio little endian. It was suggested that a feature bit can be used for this, but I now think I see two problems: 1. Features are optional, in that there's no way for device to communicate to guest that guest must ack a feature bit, and e.g. fail if guest does not ack. On the other hand, it seems likely that a hardware virtio device might want to *only* implement little endian format and not both big and little endian. In other words this would be something Paolo once called a "negative feature". 2. With virtio-pci we are running out of transport bits, and need a new config space layout to add extra feature bits. Thus what I'd like to suggest is a new field reporting to guest whether device supports native format, little endian format, or both. This new field will naturally be only exposed in the new layout. Thoughts? -- MST
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