Thanks, I guess that was just a nobbish question then.. I was also wondering about SLI/CF, as far as you know, as long the iommu groups are properly isolated, can one get sli/cf working by porting two identical GPUs on one guest, and occasionally reassign one of the GPUs to a second guest and run both guests at the same time? Would I need to manually remove the sli/cf bridge before trying that? On Jul 9, 2016 4:52 AM, "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. >
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