Kernel Direct Memory Access (DMA) Protection is a Windows security feature that protects against external peripherals from gaining unauthorized access to memory. PCIe hot plug devices such as Thunderbolt, USB4, and CFexpress allow users to attach classes of external peripherals, including graphics cards, to their devices with the plug-and-play ease of USB. These devices are DMA-capable, and ...
DMA Programming Techniques Direct Memory Access (DMA) is a data transfer strategy that bypasses the CPU. Instead, a dedicated DMA controller transfers data between memory and a device. Drivers can use the DMA controller to transfer data directly. To get started, see Introduction to Adapter Objects. DMA programming techniques include: Scatter/Gather DMA Common-Buffer System DMA Bus-Master DMA ...
DMA Verification monitors the use of Direct Memory Access (DMA). Since the DMA routines have changed as Windows has developed, many drivers make incorrect use of DMA calls. Moreover, some driver writers attempt to bypass the HAL DMA subsystem altogether. This practice can introduce insidious bugs into the driver. The DMA Verification option of Driver Verifier attempts to catch common DMA ...
The !dma extension displays information about the Direct Memory Access (DMA) subsystem, and the DMA Verifier option of Driver Verifier.
Kernel DMA Protection, (also known as Memory Access Protection, is a feature of a Windows 10 Secured-core PC that is supported on Intel and AMD platforms starting with Windows 10, version 1803 and Windows 10, version 1809. With this feature, the OS and the system firmware protect the system against malicious and unintended Direct Memory Access (DMA) attacks for all DMA-capable devices: During ...
Because IOMMU DMA remapping offers little value to integrated GPUs that should, by definition, already be designed to access all physical memory in the system, implementing support on integrated parts is optional but recommended. Discrete GPUs must support IOMMU DMA remapping, which is a requirement for WDDM 3.0 certification.