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

在 2021/6/3 下午9:55, Andi Kleen 写道:

quoted

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

Ok, then I'm going to post a formal series, please have a look and we 
can start from there.

Thanks

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