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Microsoft User Mode Driver Framework 19 466



The blocklist policy below includes "Allow all" rules for both kernel and user mode that make it safe to deploy as a standalone WDAC policy. On Windows versions 1903 and above, Microsoft recommends converting this policy to multiple policy format using the Set-CiPolicyIdInfo cmdlet with the -ResetPolicyId switch. Then, you can deploy it as a Base policy side-by-side with any other policies in your environment. To instead add these rules to an existing Base policy, you can merge the policy below using the Merge-CIPolicy cmdlet. If merging into an existing policy that includes an explicit allowlist, you should first remove the two "Allow all" rules and their corresponding FileRuleRefs from the sample policy below.




Microsoft User Mode Driver Framework 19 466



This release is a significant step toward improving the experience of using NVIDIA GPUs in Linux, for tighter integration with the OS, and for developers to debug, integrate, and contribute back. For Linux distribution providers, the open-source modules increase ease of use. They also improve the out-of-the-box user experience to sign and distribute the NVIDIA GPU driver. Canonical and SUSE can immediately package the open kernel modules with Ubuntu and SUSE Linux Enterprise Distributions.


For data center GPUs in the NVIDIA Turing and NVIDIA Ampere architecture families, this code is production-ready. This was made possible by the phased rollout of the GSP driver architecture over the past year, designed to make the transition easy for NVIDIA customers. We focused on testing across a wide variety of workloads to ensure feature and performance parity with the proprietary kernel-mode driver.


In this open-source release, support for GeForce and Workstation GPUs is alpha-quality. GeForce and Workstation users can use this driver on NVIDIA Turing and NVIDIA Ampere Architecture GPUs to run Linux desktops and use features such as multiple displays, G-SYNC, and NVIDIA RTX ray tracing in Vulkan and NVIDIA OptiX.


The open-source kernel-mode driver works with the same firmware and the same user-mode stacks such as CUDA, OpenGL, and Vulkan. However, all components of the driver stack must match versions within a release. For instance, you cannot take a release of the source code, build, and run it with the user-mode stack from a previous or future release.


Many gamers want higher frame rates. But others have plenty of FPS and instead want to maximize image quality. NVIDIA DLAA (Deep Learning Anti-Aliasing) is a new AI-based anti-aliasing mode for users who have spare GPU headroom and want higher levels of image quality. DLAA uses the same technology developed for DLSS, but works on a native resolution image to maximize image quality instead of boosting performance. The first implementation is available today on the Elder Scrolls Online test servers. Try it out and let us know your feedback on the Driver Feedback Forum.


Regardless of the type of I/O request, internally I/O operations issued to a driver on behalf of the application are performed asynchronously; that is, once an I/O request has been initiated, the device driver returns to the I/O system. Whether or not the I/O system returns immediately to the caller depends on whether the handle was opened for synchronous or asynchronous I/O. Figure 8-8 illustrates the flow of control when a read operation is initiated. Notice that if a wait is done, which depends on the overlapped flag in the file object, it is done in kernel mode by the NtReadFile function.


This section traces a synchronous I/O request to a single-layered kernel-mode device driver. In its most simplified form, handling a synchronous I/O to a single-layered driver consists of seven steps:


The preceding section showed how an I/O request to a simple device controlled by a single device driver is handled. I/O processing for file-based devices or for requests to other layered drivers happens in much the same way. The major difference is, obviously, that one or more additional layers of processing are added to the model.


When a driver is being called with an IRP targeted to a particular file object, Windows makes sure that if the request comes from kernel mode, the IRP uses normal priority even if the file object has a lower I/O priority hint. This is called the kernel bump.


Driver Verifier is a mechanism that can be used to help find and isolate common bugs in device drivers or other kernel-mode system code. Microsoft uses Driver Verifier to check its own device drivers as well as all device drivers that vendors submit for Windows Hardware Quality Labs (WHQL) testing. Doing so ensures that the drivers submitted are compatible with Windows and free from common driver errors. (Although not described in this book, there is also a corresponding Application Verifier tool that has resulted in quality improvements for user-mode code in Windows.)


5.1 PCs (which include both desktop and laptop models), can be distinguished from more powerful, more expensive computers known as Servers, which are designed to provide services and functionality to multiple users, either in local area network or over the Internet.


170.1. Unused software on a PC, particularly a program as large as a modern browser, takes up scarce and valuable space on the user's hard drive and may therefore increase hardware resource requirements. 076b4e4f54


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