This is interesting. The Microsoft Surface book has a dgpu in the keyboard that can be attached/detached at will. Could be a combination of proprietary hardware/software though.
On Fri, Jul 8, 2016, 9:53 PM Alex Williamson <alex.l.william...@gmail.com> wrote: > On Fri, Jul 8, 2016 at 8:43 PM, Kajim Shanti <kajimsha...@gmail.com> > wrote: > >> Hi, >> Since I heard there are some PCIe devices that are hot-pluggable, I was >> wondering if it might work to cut off the power from a discrete graphic >> card in order to reassign it among different VMs without having to restart >> the host (and possibly the guests too?) Has anyone tried yet? Might it help >> to get a secondary PSU so that one could easily power on and off his >> descrete graphics without having to open the case? Thank you, sorry if the >> question was asked already. >> > > Why would you need to cut power to the device to reassign it? The > limitation here is guest drivers, the bus reset we do is already sufficient > for hot-plugging between guests, unless you've made the mistake of buying > AMD. AFAIK, Windows already supports both hot unplug and re-plug, but > seems to require a guest reboot to really activate a hot-added GPU. I > don't know if I've tested this on win10 though, maybe it's improved. > Anyway, a secondary PSU is probably only going to allow you to put the card > into a broken state where the GPU is still powered by the slot, but doesn't > have the additional external power. Seems like a non-zero chance of > letting out the magic smoke doing something like that too. > _______________________________________________ > vfio-users mailing list > vfio-users@redhat.com > https://www.redhat.com/mailman/listinfo/vfio-users >
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