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How is this interposition different from what the virtual memory subsystem already does? Many other memory-mapped devices have kernel support. Access to these i
by ok123456 3y ago
How is this interposition different from what the virtual memory subsystem already does? Many other memory-mapped devices have kernel support. Access to these is usually mediated through udev or an equivalent on Linux.
- singron 3y agoI have no specific knowledge, but it seems similar to issues we had before iommus. E.g. maybe the device accesses physical memory without memory protection and/or virtual address mapping, so the kernel needs to do that in its behalf.
- saagarjha 3y agoThis is correct, typically these devices need some page tables/IOMMU be set up to be told where they should read and write from.