PCI passthrough - VFIO and QEMU.

dylanmc · Posted: Wed Jan 10, 2018 8:54 pm Post subject:

No, there is a misunderstanding.

I have a monitor capable of two HDMI input, and when I launch the virtual machine, I didn't get any output in the HDMI where the gpu passtrought card is connected.
I only see it's doing something cause the init messages before the xorg switch to the secondary GPU disappears.

The onmly think I haqve to do is try to dump my GPU 980ti rom, but actually I didn't have any windows to grab it.
I've grabbed on linux, no luck on that..

dylanmc · Posted: Wed Jan 10, 2018 9:06 pm Post subject:

Thanks keet, I will try your suggestions as soon as possible.

I ask you one thing: you boot on your secondary GPU or on the first GPU?

Because I boot on first GPU, the xorg switch to the secondary, ad X starts on it.
The first gpu gets the vfio module but it seems it's missing the rom or something else.[/quote]

keet · Guru Joined: 09 Sep 2008 Posts: 567

szatox · Advocate Joined: 27 Aug 2013 Posts: 3129

dylanmc · Posted: Sat Jan 13, 2018 5:17 pm Post subject:

dylanmc · Posted: Sun Jan 14, 2018 12:05 pm Post subject:

Some news

I have installed an Ubuntu, in a WM.

Using a rom dumped by me or downloaded from a websiste, I got X finally working on the passtrought card, but it's still unusable, the ubuntu system won't boot.
The Windows one, give me no sign of life.

no errors in dmesg, no errors on qemu log

dylanmc · Posted: Sun Jan 14, 2018 7:41 pm Post subject:

After TONS of configurations, I got my ubuntu works in gpu passtrought!!!

But the windows side, doesen't

This is my configuration

dylanmc · Posted: Sat Jan 20, 2018 9:57 pm Post subject:

A tons of try.. still passtrought only on a ubuntu

dylanmc · Posted: Sun Jan 21, 2018 4:13 pm Post subject:

I finally have installed the nvidia drivers in win10, bit I got error 43.
I've read a lot of forums and messages, but the card is still blocked.

I've tried to hide, but with no luck

keet · Guru Joined: 09 Sep 2008 Posts: 567

Do you have (at least the equivalent of):

-cpu host,kvm=off

dylanmc · Posted: Sat Jan 27, 2018 12:00 am Post subject:

keet · Guru Joined: 09 Sep 2008 Posts: 567

Are you trying to use HyperV inside the guest? If not, I would remove that section.

It looks like you have several virtual U.S.B. controllers. They're probably unrelated, but they might also be unnecessary. I just pass through my host's U.S.B. controller and plug a hub with all my peripherals into one of its ports.

The same (regarding it being unnecessary) might be true of the P.C.I. controller, serial port, and console.

I wonder whether the Spice console might be causing problems; can you try removing the Spice adapter along with qxl video, the U.S.B. tablet device, mouse, keyboard, and other Spice devices/configurations?

I wonder whether specifying a null vendor identifier is causing problems; it might be worth removing that. I'm not sure what the rest of the Qemu command line does. It looks like you have the '-cpu' switch but without any arguments, unless it counts 'host' on the next line.

I don't know what you need, but it seems like your configuration file might have many unnecessary things. Trimming them away might fix the problem or at least make it easier to diagnose.

dylanmc · Posted: Sun Jan 28, 2018 4:40 pm Post subject:

Are you successfully pass an nvidia card to windows?

I removed hyperv, same error
Removed some usb stuff as you suggest, still get the same error.

If I remove the spice console I didn't see anything.

The nvidia driver still detects kvm and gets me error 43..

keet · Guru Joined: 09 Sep 2008 Posts: 567

Yes, I successfully passed through my GTX 1070 to Windows 10 (as well as Gentoo and Debian Linux) and tested it successfully in 3D games. This is my command:

bunder · Bodhisattva Joined: 10 Apr 2004 Posts: 5934

keet · Guru Joined: 09 Sep 2008 Posts: 567

That is true, but I think that it's more complicated to set up, so it might be better to focus on making passthrough work first, and then work on passthrough in Spice later. I was pasting my configuration because it's (at least close to) the minimum that one needs to make it work. If we simplify it as much as possible first, then we can work on adding features later.

I'm running mine on a server with Intel and NVidia graphics. The NVidia graphics card is never used by the host -- it has no kernel configuration for it and no NVidia drivers installed. I have only one monitor, which is connected to the Intel (motherboard) graphics and the video card. However, the host never displays anything through the discrete graphics card; only virtual machines do that.

I don't know about the benefits of using virt-manager, but it seems like it might be adding quite a few unnecessary things here. At the very least, it might help to strip them until the G.P.U. is working, and then add them back and see whether it still works. HyperV is another hypervisor, so enabling support for it might complicate matters, even if it's only running HyperV as a host inside the guest (nested virtualization). I don't know how much is necessary to make a V.M. work with virt-manager, but it looks to me like the guest's U.S.B. controllers, serial ports, tablet input device, keyboard, mouse, sound, memory ballooning, P.C.I. and I.D.E. controllers, and Spice support could all be removed. You might not see anything with Spice disabled, but in that case, it might be best to enable Remote Desktop and use rdesktop or something similar to shut it down if it doesn't work. Many people here probably know virt-manager much better than I do and can correct me.

The one other thing that I would check is the syntax of the <qemu:commandline> section. 'kvm=off' should take care of the problem for you, and I do see it there, but maybe it's not working because of syntax. Can anyone here comment on the syntax of that section? Compared to my command line, it has a couple extra parameters.

dylanmc · Posted: Sat Feb 03, 2018 6:59 pm Post subject:

I've else tried to change my GPU Nvidia card, an 1060 GTX: but the same error, 43.

I think that passing a grabbed rom can be useful, but I'm unable to grab it correctly

dylanmc · Posted: Sun Aug 26, 2018 7:53 am Post subject:

Finally, after a lot of tryes, I got my GPU passtrought work.
I had to change my card from Nvidia to AMD.. the only thing that was blocking me was the NVIDIA Win10 drivers :/

Bye bye Nvidia !!!

Anon-E-moose · Posted: Sun Aug 26, 2018 10:53 am Post subject:

Definitely easier to passthrough amd cards, don't know why nvidia makes it so hard, but they do.
_________________
PRIME x570-pro, 3700x, 6.1 zen kernel
gcc 13, profile 17.0 (custom bare multilib), openrc, wayland

dylanmc · Posted: Sun Aug 26, 2018 12:59 pm Post subject:

I think the only want to sell' quadros.
No other reasons forum me..

dylanmc · Posted: Sun Sep 02, 2018 5:04 pm Post subject:

another question : does anyone passtrought an entire partition to the guest system?

Belliash · Posted: Wed Jul 03, 2019 7:06 pm Post subject:

Hello,

I own a notebook - Clevo P170SM with i7-4800mq and gtx770m installed.
I have managed to run Windows 10 in KVM and successfully passed the nvidia card with vfio. Unfortunately as this is a laptop, there is no way to connect external monitor. Thus I decided to give it a try with VNC sever.

I installed Heaven benchmark on both VM and bare metal and compared FPS. On bare metal I get around 100FPS, while in VM it reports just around 30-40FPS and video is very laggy. I suppose that lag can be related to VNC but why I got just up to 40FPS?
_________________
Asio Software Technologies
Belliash IT Weblog