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

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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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>
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