So, I added "pcie_acs_override=downstream,multifunction" to grub commandline options and now they are in different iommu groups and VMs are running. Sorry for bothering you =)
I have two VMs on one node. The both use PCI devices, but different. And they can't run at the same time together.
Error from first:
kvm: -device vfio-pci,host=0000:02:00.0,id=hostpci1,bus=ich9-pcie-port-2,addr=0x0: vfio 0000:02:00.0: failed to...