Quote:
Originally Posted by omranxastm
Hello can someone tell me how firmwares that work with iommu work is there a certain bypass or it depends on the driver for example for example when emulating a standard xhci board windows loads the default xhci driver which maps certain memory regions which I think is not enough for walling aimbot etc ( I could be wrong ) so which is it does the iommu “bypass” depend on the driver you load or is there a certain way to bypass iommu which I doubt is the case
|
IOMMU handling generally does not depend on a specific Windows driver "bypass." The driver only determines which device resources and DMA mappings the OS requests. Whether a DMA-capable device can access memory is ultimately controlled by the IOMMU configuration and the operating system's DMA remapping policies.
If you're emulating an xHCI controller, the default xHCI driver will typically only map the memory regions required for normal USB controller operation. Any additional DMA access would require the OS to explicitly create those mappings. So in practice, the accessible memory range depends on the DMA mappings granted by the OS/IOMMU, not on a generic IOMMU bypass mechanism.
