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The issue for Qubes is security. GPUs can be used to subvert basically all the otherwise hardware-enforced security protections.

• creole_wither 2y ago
  In a desktop, couldn't you assign a GPU to one video machine and in that scenario would there still be a security problem when there is only one VM using it?
  • adastra22 2y ago
    It’s not about virtual machines. GPUs typically have direct memory access to pretty much all system RAM. There exist PCIe mitigations, but the review does not meet up to Qubes security standards.
  • halJordan 2y ago
    Yes, this is what qubes would probably suggest as the solution.