Christoph Hellwig
2022-Jul-20 05:16 UTC
[PATCH] virtio: Force DMA restricted devices through DMA API
On Tue, Jul 19, 2022 at 04:11:50PM +0000, Keir Fraser wrote:> Well here are two possible approaches: > > 1. Revert e41b1355508d outright. I'm not even sure what it would mean > for reported pages to go through IOMMU. And VIRTIO_F_ACCESS_PLATFORM > is no longer IOMMU-specific anyway. > > 2. Continue to clear the flag during virtio_balloon negotiation, but > remember that it was offered, and test for that in vring_use_dma_api() > as well as, or instead of, virtio_has_dma_quirk(). > > Do either of those appeal?I'll have to defer to people that actually understand the virtio_balloon code, because I haven't evey seriously looked at it.