On Mon, Aug 24, 2020 at 11:06:51AM -0400, Konrad Rzeszutek Wilk wrote: > So it fails at > > 683 dev_WARN_ONCE(dev, 1, > > 684 "swiotlb addr %pad+%zu overflow (mask %llx, bus > limit %llx).\n", > 685 &dma_addr, size, *dev->dma_mask, > dev->bus_dma_limit); > > > which makes no sense to me as `dev` surely exists. I can see in the console > log: > > virtio-pci 0000:00:01.0: vgaarb: deactivate vga console > > So what gives?
Well, look at the if around the WARN_ON - dma_capable failed on the swiotlb buffer. This means the virtio drm thingy has a dma mask (either the actual one set by the driver, or bus_dma_mask), which isn't enough to address the swiotlb buffer. _______________________________________________ iommu mailing list firstname.lastname@example.org https://lists.linuxfoundation.org/mailman/listinfo/iommu