[vfio-users] vga pass-thru and different gfx cards.

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Dump the ROM using envytools and attach it to the card, that may help.
You can get ROMs from techpowerup DB, i think there are some from gigabyte.
Different vendors' ROMs should work if the cards are similar enough: same
clocks, same mem, same PCB design features.
The quadro cards should work as a secondaru passthrough - accelerating the
VM inside of the usual QEMU window. And AFAIR it's officially supported by
nvidia.
On Sep 10, 2015 8:01 PM, "Torbjorn Jansson" <
torbjorn.jansson at mbox200.swipnet.se> wrote:

> Hello all.
>
> first of all a big thanks to alex willamsons and his blog series about
> getting a graphic card passed thru to a vm.
> without those i wouldn't have been able to get it to work (more or less)
>
> first some hw info about my linux box where i'm using vfio & kvm:
> asus p8Z77-v le with 16gb ram and at the moment i'm using a nvidia gt610
> card from asus but i have also tried a gtx570.
>
> i got it to work after a bit of reading alex blogs and a lot of testing.
> i use the built in intel gfx card for the host since that is no good for
> anything else and the gt610 is passed thru to a win7 vm.
>
> first problem i have is that vga pass-thru only works one time after a
> cold boot.
> if i try to restart the vm or just power it of and on again i get a hard
> lockup of the host.
> this is the most annoying problem.
>
> the second problem is because the gt610 and gtx570 don't have any uefi
> bios i am forced to use plain vga pass-thru and i have to use the vgaarb
> patch to get it to work at all.
> the problem (well, not really a problem but more of an extra complication)
> with this is that i have to manually patch and compile a new kernel.
> it also disables vaapi/vdpau on the host and i use the hosts gfx card
> where having those still working would have been beneficial.
>
>
> my questions:
> i assume that it is the old vga pass thru and not uefi vbios (gop?) that
> contributes to the reboot problems, is that correct?
> at least with uefi i assume i would be able to get rid of the vgaarb patch
> fixing vaapi/vdpau support.
>
> if i bought another gfx card for vm pass-thru how would an uefi card
> improve things? (gt720 for example)
> and would for example one of the not so expensive quadro cards like k420
> fix a few more issues? like the nvidia driver check for visualization.
>
> i assume the k420 have the highest probability of just working and getting
> rid of the most issues, what is not clear is if k420 also have uefi support.
>
> one annoying thing is that my asus gt610 card is supposed to be upgradable
> to uefi via a download tool from asus, but this doesnt work.
> first issue i had was it only worked on asus mainboard, luckily my linux
> box had an asus mainboard so i had to temporarily put in a new disk and
> install windows to test the upgrade tool, but it still failed but now on
> the gfx card and just said contact support.
>
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