On Sun, Apr 18, 2021 at 01:31:23PM -0400, Kyle Harding wrote: > That does help, thank you Greg! It seems that in general the transport > shouldn't be a problem. > > What if the non-hardware side is a kvm guest kernel without IOMMU support? > If we used greybus to expose the SDIO bus to the kvm would the DMA transfer > garbage in Host Memory? > > I understand this is a non-traditional approach, and I believe that with > IOMMU this wouldn't be an issue. Again, I think you are getting very confused as to what the greybus protocol stack is for. You can use it for any type of bus you want, you just need to write a driver for that transport layer. But for talking to virtual machines, why not just use the virtio layer which is designed just for that? You could make a virtio transport for greybus, but really, why? Who would use that? And again, IOMMUs have nothing to do with this at all. thanks, greg k-h _______________________________________________ greybus-dev mailing list greybus-dev@xxxxxxxxxxxxxxxx https://lists.linaro.org/mailman/listinfo/greybus-dev
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