Why is it not possible to securely virtualize the GPU? On Sunday, January 14, 2018 at 6:08:37 AM UTC-5, Vít Šesták wrote: > Qubes does not have GPU virtualization for security reasons. As a result, > additional GPU is used only in dom0 (od GuiVM in future). GPU might be useful > for: > > * additional output like HDMI (well, good luck…) > * window manager acceleration (but integrated GPU usually does the job well > for less power) > * GPU passthrough to a VM (It might work, but it is not officially not > supported and much work will be needed. Also, if the VM can rewrite GPU > firmware, the GPU can perform a DMA attack during boot.) > > When selecting my last laptop, I've decided to choose one without additional > GPU. First, I don't need it much. Second, it adds some hassle. It would be > ideal to have it switched off in order not to comsume power (=> lower heat, > more quiet laptop, better battery life). On the other hand, I remember having > HDMI output wired to the additional GPU, which was rather PITA. I was able to > get it somehow working on my old laptop, but it used to crash X11. > > HDMI through additional GPU will reportedly get better with Wayland, but we > are not there yet. > > Regards, > Vít Šesták 'v6ak'
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