[vfio-users] [help] 2 identical GPUs in Arch

[Ben J]

Did vfio-pci bind? I would bind the vfio before nvidia in your script. You
can try to unbind from nvidia but I know it generally doesn't work well. So
for #2 I wouldn't expect that to work. I'm pretty bad with the boot process
so I'll leave that for someone else.
On Feb 23, 2016 1:33 PM, "Garland Key" <david.garland.key at gmail.com> wrote:

> @Alex & @Ben J
>
> I tried binding both cards to pci-stub in boot options and then running
> the following script in initramfs:
>
>     echo 0000:01:00.0 > /sys/bus/pci/drivers/pci-stub/unbind
>     echo 0000:01:00.1 > /sys/bus/pci/drivers/pci-stub/unbind
>     echo 0000:02:00.0 > /sys/bus/pci/drivers/pci-stub/unbind
>     echo 0000:02:00.1 > /sys/bus/pci/drivers/pci-stub/unbind
>     echo 0000:01:00.0 > /sys/bus/pci/drivers/nvidia/bind
>     echo 0000:01:00.1 > /sys/bus/pci/drivers/nvidia/bind
>     echo 0000:02:00.0 > /sys/bus/pci/drivers/vfio-pci/bind
>     echo 0000:02:00.1 > /sys/bus/pci/drivers/vfio-pci/bind
>
> This didn't work (nvidia driver doesn't attach to either card) but I think
> I'm understanding more and will find a solution with the more understanding
> I gain (call me Captain Obvious).
>
> I have a two questions that should help me understand what to do.
>
> 1. After initramfs runs, systemd takes over.  At what point in this
> process does the nvidia driver actually try to load and when does X try to
> start?
>
> 2. Should I just not use pci-stub and instead just run a script in
> initramfs that unbinds both cards and then binds each one to the driver
> that I want?
>
> On Sun, Feb 21, 2016 at 12:58 PM Garland Key <david.garland.key at gmail.com>
> wrote:
>
>> I checked dmesg and there wasn't anything that stood out.  There was a
>> DRM error message for nvidia but it wasn't critical.  I'll look into this
>> more tomorrow.  I have to go to sleep (I work at night).  Thanks, Alex.
>> I'll let you know if and when the advice you and Ben have shared works.
>>
>> On Sun, Feb 21, 2016 at 12:40 PM Alex Williamson <
>> alex.williamson at redhat.com> wrote:
>>
>>> On Sun, Feb 21, 2016 at 10:01 AM, Garland Key <
>>> david.garland.key at gmail.com> wrote:
>>>
>>>> It seems xorg crashed because the nvidia kernel module failed.  Here's
>>>> the xorg log file:
>>>>
>>>
>>> Did the intended device get bound to the nvidia module?  Are there dmesg
>>> errors?  You could try creating a file like:
>>>
>>> /etc/X11/xorg.conf.d/10-nvidia.conf:
>>> Section "Device"
>>>     Identifier "Device0"
>>>     Driver "nvidia"
>>>     VendorName "NVIDIA Corporation"
>>>     BusID "PCI:1:0:0"
>>>     # Or PCI:2:0:0, depending on which is intended for the host
>>> EndSection
>>>
>>> Maybe Xorg is complaining because it's trying to use both cards when you
>>> only intend for it to use one.
>>>
>>
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