[vfio-users] vfio help needed (nvidia GTX 750 Ti persistent code 43)

[Blank Field]

Read alex's blog at vfio.blogspot.com
He has the same GPU and gives you hardware recommendations.
But it should be possible to make it work, but it took me a year to figure
out how.
On Sep 17, 2015 8:21 AM, "Mogliii" <mogliii at gmx.net> wrote:

> OK, now this is a new information for me. I thought all along that my
> problem is the graphics card.
>
> I tried to understand your whole message but I got lost at MMIO and PIO.
> For the sake of saving my precious time and avoiding frustration, I should
> better get a new motherboard and CPU? How high are the chances it will work
> with my GXT750 Ti?
> Any hardware suggestions (I have DDR3-1600 memory that I would like to
> keep using)?
>
> Thank you
>
>
>
> On 9/17/2015 1:18 PM, Blank Field wrote:
>
> You have an AMD FM2 CPU.
> Do use SeaBIOS and make use of VGA I/O lines, you must have a VideoBIOS
> Extension support in your GPU's firmware. Since we are in the 21'st
> century, you have it.
> But the problem is that in order to make VGA work in a VM we must
> translate MMIO, PIO and IRQs needed into the VM.
> That is where IOMMU kicks in, and the related part of software is
> vfio-pci's x-vga option.
> Usually you enable x-vga, vfio tells IOMMU to translate all VGA related
> stuff from GPU to the VM and vice versa, but on that particular
> platform(AMD FM2) something is broken in hardware that crashes the IOMMU
> and the CPU when trying to work with VGA.
> On Sep 17, 2015 3:15 AM, "Alex Williamson" <alex.williamson at redhat.com>
> wrote:
>
>> On Wed, Sep 16, 2015 at 6:06 PM, Mogliii <mogliii at gmx.net> wrote:
>>
>>> Dear Alex,
>>>
>>> What do you mean you are suspicious of pci-stub?
>>> All tutorials I've seen so far require you to prevent nuveau from
>>> grabbing the card. Also in your very well written tutorial I followed
>>> and helped me a lot.
>>> (http://vfio.blogspot.jp/2015/05/vfio-gpu-how-to-series-part-3-host.html
>>> )
>>>
>>> I just tried the MSI GTX 750 Ti with Bios mode (bios selection switch ->
>>> 1, followed by host reboot). But it behaves the same. I see the ovmf
>>> bios and boot splash, but then loss of signal.
>>>
>>
>> It's not that you're using pci-stub, it's that pci-stub is built as a
>> module on your kernel and you need to be sure to put all the pieces in
>> place to make sure that module gets loaded before anything else that might
>> touch the device.  As I said, it appears to be working, but you're still
>> getting a code 43.
>>
>> _______________________________________________
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>> vfio-users at redhat.com
>> https://www.redhat.com/mailman/listinfo/vfio-users
>>
>>
>
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