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.
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