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Description of problem: virtio-win drivers are not reporting VIRTIO_F_IOMMU_PLATFORM feature. There are several things that should be done to fix it: 1. Ensure that Windows drivers are using Windows kernel DMA (easier for storage and network drivers that are already using framework specific APIs, additional work should be done for WDF based drivers). 2. Report the feature. Version-Release number of selected component (if applicable): How reproducible: Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info:
Changes are in: https://github.com/virtio-win/kvm-guest-drivers-windows/pull/418
Reproduced this issue with build virtio-win-prewhql-173 on win10-32 guest cm, cannot install vioinput driver with iommu_platform=on. Verified this issue with build virtio-win-prewhql-174 on win10-32 guest vm, virtio-input driver can be installed successfully with iommu_platform=on and works normally. So this bug is fixed, changed the bug status to verified.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHEA-2020:1757