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

[Mogliii]

Hello,

Just to report: After replacing the motherboard with the AsRock Z87
Extreme6 and the Core i5 4460, I only switched the grub iommu statement
and VGA Passthrough works!!!

Currently driver 340.52.

So at least for me AMD APU was the problem.
I am using the top most PCIe16x port, and I can assign it to the VM
without patches.

Now I have to fix a problem with lags, but which happened already
before. Not sure if it has to do with the fact that I am running off an
LVM volume on a Raid1. The lags are not visible in the host.

Xeon CPU is financially out of my league. I think the limitation of my
new motherboard now is that the PCIe ports are not separated between
each other.  (Need to pass all or none) I can live with that.

You might consider adding a disclaimer in your blog that and A10-7850K
on the Asus A88X-Pro does not work.

Thank you all for your help.

On 9/17/2015 11:50 PM, Alex Williamson wrote:
> On Thu, Sep 17, 2015 at 2:05 AM, Mogliii <mogliii at gmx.net
> <mailto:mogliii at gmx.net>> wrote:
>
>     On 9/17/2015 2:24 PM, Blank Field wrote:
>>
>>     Read alex's blog at vfio.blogspot.com <http://vfio.blogspot.com>
>>     He has the same GPU and gives you hardware recommendations.
>>
>     I found it, but on the page it also says that "I wouldn't
>     necessarily recommend this particular setup (it's probably only
>     available on ebay anymore anyway)".
>     Any specific chipset I should aim for? I guess the CPU (i3, i5 or
>     i7) won't make a big difference as long as VTx is shown in the
>     datasheet? The google docs file shows many older models that are
>     not not sold anymore. Especially I would like to pick a
>     motherboard that has proper iommu separation of the primary
>     pcie-slot. So I don't need kernel patching.
>>
>>     But it should be possible to make it work, but it took me a year
>>     to figure out how.
>>
>     Sorry, I have other things to do within the next year ^^
>
>
> i3 does not have VT-d support, not an option.
>
> i5, i7, and Xeon E3 do not have isolation on the processor root ports,
> my blog explains how that limits your options.
>
> We have quirks providing isolation for most Intel PCH root ports:
>
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/pci/quirks.c#n3743
>
> Note that Skylake chipsets are not included in that list and will
> currently have issues with isolation and grouping.
>
> I do make specific recommendations, E5 or better Xeon and X79 or X99
> chipset.  There are cheaper configurations, but you need to understand
> how they limit your options.  And as others have noticed, even the
> recommended platform does not provide full isolation of every
> integrated I/O device.
>
> Some people like AMD system and there are a number of users that seem
> to be getting along ok on 990FX systems.  We have some isolation
> quirks for those boxes too:
>
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/pci/quirks.c#n3694

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