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

[Mogliii]

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
> <mailto:alex.williamson at redhat.com>> wrote:
>
>     On Wed, Sep 16, 2015 at 6:06 PM, Mogliii <mogliii at gmx.net
>     <mailto: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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