在 2021/6/3 上午10:56, Andi Kleen 写道:
I agree, but I want to know why indirect descriptor needs to be
disabled. The table can't be wrote by the device since it's not
coherent swiotlb mapping.
I had all kinds of problems with uninitialized entries in the indirect
table. So I gave up on it and concluded it would be too difficult to
secure.
-Andi
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?
Thanks
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