On 2012-06-08 15:03, Michael S. Tsirkin wrote: >> + /* set master */ >> + pci_set_master(pdev); >> + >> + /* set DMA mask */ >> + err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64)); > > uio currently only supports devices which do not > do DMA. > > DMA from uio controlled devices is a no no unless > it's behind an IOMMU which can protect us from > random memory corruptions this could cause. > > In the later case it's OK but we need some code > to check this and program the IOMMU appropriately. AKA: VFIO. :) Dominic, maybe you want to have a look at Alex's work: https://github.com/awilliam/linux-vfio Jan -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
