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Jason Gunthorpe authored
IOMMU_CACHE means that normal DMAs do not require any additional coherency mechanism and is the basic uAPI that VFIO exposes to userspace. For instance VFIO applications like DPDK will not work if additional coherency operations are required. Therefore check IOMMU_CAP_CACHE_COHERENCY like vdpa & usnic do before allowing an IOMMU backed VFIO device to be created. Reviewed-by:
Kevin Tian <kevin.tian@intel.com> Acked-by:
Alex Williamson <alex.williamson@redhat.com> Acked-by:
Robin Murphy <robin.murphy@arm.com> Signed-off-by:
Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/4-v3-2cf356649677+a32-intel_no_snoop_jgg@nvidia.comSigned-off-by:
Joerg Roedel <jroedel@suse.de>
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