[vfio-users] Strange behavior with recent update. ACS(?) & VFIO

[A de Beus]

Just as a comment, I have a similar system, though no ACS, also recently updated Arch and noticed a change in libvirt behavior. Specifically, my VM which didn't autostart for some reason (there were multiple cryptic errors in the journal) started autostarting again. (It worked when I first set it up, then stopped several Arch updates ago).  The joys of running Arch and subtle interactions....  I assume it will stop again at some future Arch update.

> On Aug 2, 2016, at 3:09 PM, Alex Williamson <alex.l.williamson at gmail.com> wrote:
> 
> 
> 
>> On Tue, Aug 2, 2016 at 4:02 PM, Mark <kram321 at gmail.com> wrote:
>> Thank you for your input Alex, here is a pastie with some of the info you were interested in:
>> VM powered off: http://pastie.org/10927534
>> 00:1b.0 is the onboard, 01:00.0 and 01:00.1 are the nvidia gpu/nvidia audio.
> 
> Group 1
> /sys/kernel/iommu_groups/1/devices/0000:00:01.0
> /sys/kernel/iommu_groups/1/devices/0000:01:00.0
> /sys/kernel/iommu_groups/1/devices/0000:01:00.1
> 
> Group 7
> /sys/kernel/iommu_groups/7/devices/0000:00:1b.0
> 
>  
>> Notice in that pastie the driver in use is snd_hda_intel, yet in this lspci -vvv (with the VM booted up) it is changed to vfio-pci, and they are still in the same iommu group.
>> VM powered on: http://pastie.org/10927535
> 
> There must be some confusion over what an iommu group is because those are clearly in separate groups with and without the VM running.  The driver is simply the driver in use for the device, it doesn't change the composition of the group.  IOMMU groups are assigned at boot and barring removing and re-adding the device, don't change.  Thanks,
> 
> Alex
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