Runtime iommufd #43
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Runtime iommufd #43
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We can manage iommu hardware through either (1) vfio or (2) iommufd which has been newly added to kernel recently. libvfn has provided enabling iommufd in the compile time, but sometimes application might want to use vfio type rather than iommufd if app wants to map PCI BAR area to iommu mapping table which can't be done with iommufd. To provide flexibility to applications, choose iommu backends in the runtime if iommufd is built properly on the system where iommufd kernel header file is available. The default backend will be iommufd if available, but user can override it with VFN_IOMMU_FORCE_VFIO environment varaible for vfio mode. Signed-off-by: Minwoo Im <minwoo.im@samsung.com>
To figure out which backend iommu context is binded to the given device from application side. The previous commit has started supporting choosing iommu context type in the runtime so that application might want to figure out which type of context is binded. Signed-off-by: Minwoo Im <minwoo.im@samsung.com>
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