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





On Tue, Aug 2, 2016 at 4:02 PM, Mark <kram321 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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