V Tue, Mar 22, 2022 at 07:30:13AM -0400, Demi Marie Obenour napsal(a): > All kernel-mode drivers, to be specific. User-mode drivers are an > underutilized alternative for systems that have an IOMMU/SMMU. Obviously, > the drivers still need to be free software for Fedora to package them, but > user-mode drivers have the advantage of not running with kernel privilege. That smells like a microkernel :) I did not know it's possible. I can image one can program IOMMU to direct all reads and writes by a device into a memory mapped into a user-space process. But how can a user space process receive interrupts? Is there an in-kernel translation layer which presents interrupts to the user process somehow? Or does it only work with the modern MSI-like interrupts which are a ring buffer of messages in a shared memory? -- Petr
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