Re: [PATCH v1 1/8] virtio: Force only split mode with protected guest

[Andi Kleen]

> Ok, but what I meant is this, if we don't read from the descriptor 
> ring, and validate all the other metadata supplied by the device (used 
> id and len). Then there should be no way for the device to suppress 
> the dma flags to write to the indirect descriptor table.
>
> Or do you have an example how it can do that?

I don't. If you can validate everything it's probably ok

The only drawback is even more code to audit and test.

-Andi