Re: generic DMA bypass flag

From: Christoph Hellwig
Date: Sat Nov 16 2019 - 01:23:19 EST

On Fri, Nov 15, 2019 at 06:12:48PM +0000, Robin Murphy wrote:
> And is that any different from where you would choose to "just" set a
> generic bypass flag?

Same spots, as intel-iommu moves from the identify to a dma domain when
setting a 32-bit mask. But that means once a 32-bit mask is set we can't
ever go back to the 64-bit one. And we had a couple drivers playing
interesting games there. FYI, this is the current intel-iommu
WIP conversion to the dma bypass flag: