IOMMU separation broken after update to 6.8.12-29-pve

Second that (Intel C236):

Code:

root@field-pve:~# uname -a
Linux field-pve 6.8.12-29-pve #1 SMP PREEMPT_DYNAMIC PMX 6.8.12-29 (2026-05-29T17:48Z) x86_64 GNU/Linux

root@field-pve:~# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-6.8.12-29-pve root=/dev/mapper/pve-root ro quiet gfxpayload=text isolcpus=0,4,1,5 intel_iommu=on iommu=pt pcie_acs_override=downstream,multifunction i915.enable_gvt=1 pci=assign-busses pci=realloc vfio-pci.ids=1000:0072,1014:03cb,8086:10e6,168c:0033,168c:003c,8086:1520

root@field-pve:~# find /sys/kernel/iommu_groups/ -type l
/sys/kernel/iommu_groups/17/devices/0000:02:10.0
/sys/kernel/iommu_groups/7/devices/0000:00:17.0
/sys/kernel/iommu_groups/15/devices/0000:03:00.0
/sys/kernel/iommu_groups/15/devices/0000:03:00.3
/sys/kernel/iommu_groups/15/devices/0000:03:00.1
/sys/kernel/iommu_groups/15/devices/0000:02:08.0
/sys/kernel/iommu_groups/15/devices/0000:03:00.2
/sys/kernel/iommu_groups/5/devices/0000:00:15.1
/sys/kernel/iommu_groups/5/devices/0000:00:15.0
/sys/kernel/iommu_groups/23/devices/0000:03:10.7
/sys/kernel/iommu_groups/13/devices/0000:00:1f.6
/sys/kernel/iommu_groups/3/devices/0000:00:08.0
/sys/kernel/iommu_groups/21/devices/i2c_designware.1
/sys/kernel/iommu_groups/11/devices/0000:00:1d.0
/sys/kernel/iommu_groups/1/devices/0000:00:00.0
/sys/kernel/iommu_groups/18/devices/idma64.0
/sys/kernel/iommu_groups/8/devices/0000:00:1b.0
/sys/kernel/iommu_groups/16/devices/0000:02:09.0
/sys/kernel/iommu_groups/16/devices/0000:04:00.0
/sys/kernel/iommu_groups/6/devices/0000:00:16.0
/sys/kernel/iommu_groups/6/devices/0000:00:16.3
/sys/kernel/iommu_groups/14/devices/0000:01:00.0
/sys/kernel/iommu_groups/4/devices/0000:00:14.2
/sys/kernel/iommu_groups/4/devices/0000:00:14.0
/sys/kernel/iommu_groups/22/devices/0000:03:10.3
/sys/kernel/iommu_groups/12/devices/0000:00:1f.2
/sys/kernel/iommu_groups/12/devices/0000:00:1f.0
/sys/kernel/iommu_groups/12/devices/0000:00:1f.3
/sys/kernel/iommu_groups/12/devices/0000:00:1f.4
/sys/kernel/iommu_groups/2/devices/0000:00:01.0
/sys/kernel/iommu_groups/20/devices/idma64.1
/sys/kernel/iommu_groups/10/devices/0000:00:1c.0
/sys/kernel/iommu_groups/10/devices/0000:12:00.0
/sys/kernel/iommu_groups/10/devices/0000:00:1c.1
/sys/kernel/iommu_groups/10/devices/0000:0f:00.0
/sys/kernel/iommu_groups/10/devices/0000:11:00.0
/sys/kernel/iommu_groups/0/devices/0000:00:02.0
/sys/kernel/iommu_groups/19/devices/i2c_designware.0
/sys/kernel/iommu_groups/9/devices/0000:08:00.0
/sys/kernel/iommu_groups/9/devices/0000:00:1b.2
/sys/kernel/iommu_groups/9/devices/0000:09:09.0
/sys/kernel/iommu_groups/9/devices/0000:0a:00.0
/sys/kernel/iommu_groups/9/devices/0000:07:00.0
/sys/kernel/iommu_groups/9/devices/0000:09:05.0
/sys/kernel/iommu_groups/9/devices/0000:00:1b.3
/sys/kernel/iommu_groups/9/devices/0000:09:01.0
/sys/kernel/iommu_groups/9/devices/0000:09:04.0
/sys/kernel/iommu_groups/9/devices/0000:0d:00.0
/sys/kernel/iommu_groups/9/devices/0000:09:07.0

Reboting into 6.8.12-28-pve works as expected:

Code:

root@field-pve:~# uname -a
Linux field-pve 6.8.12-28-pve #1 SMP PREEMPT_DYNAMIC PMX 6.8.12-28 (2026-05-28T12:14Z) x86_64 GNU/Linux

root@field-pve:~# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-6.8.12-28-pve root=/dev/mapper/pve-root ro quiet gfxpayload=text isolcpus=0,4,1,5 intel_iommu=on iommu=pt pcie_acs_override=downstream,multifunction i915.enable_gvt=1 pci=assign-busses pci=realloc vfio-pci.ids=1000:0072,1014:03cb,8086:10e6,168c:0033,168c:003c,8086:1520

root@field-pve:~# find /sys/kernel/iommu_groups/ -type l
/sys/kernel/iommu_groups/17/devices/0000:02:08.0
/sys/kernel/iommu_groups/35/devices/0000:12:00.0
/sys/kernel/iommu_groups/35/devices/0000:11:00.0
/sys/kernel/iommu_groups/7/devices/0000:00:17.0
/sys/kernel/iommu_groups/25/devices/0000:07:00.0
/sys/kernel/iommu_groups/15/devices/0000:00:1f.6
/sys/kernel/iommu_groups/33/devices/0000:0d:00.0
/sys/kernel/iommu_groups/5/devices/0000:00:15.1
/sys/kernel/iommu_groups/5/devices/0000:00:15.0
/sys/kernel/iommu_groups/23/devices/0000:03:00.3
/sys/kernel/iommu_groups/13/devices/0000:00:1d.0
/sys/kernel/iommu_groups/31/devices/0000:09:09.0
/sys/kernel/iommu_groups/3/devices/0000:00:08.0
/sys/kernel/iommu_groups/21/devices/0000:03:00.1
/sys/kernel/iommu_groups/11/devices/0000:00:1c.0
/sys/kernel/iommu_groups/1/devices/0000:00:00.0
/sys/kernel/iommu_groups/38/devices/idma64.1
/sys/kernel/iommu_groups/28/devices/0000:09:04.0
/sys/kernel/iommu_groups/18/devices/0000:02:09.0
/sys/kernel/iommu_groups/36/devices/idma64.0
/sys/kernel/iommu_groups/8/devices/0000:00:1b.0
/sys/kernel/iommu_groups/26/devices/0000:08:00.0
/sys/kernel/iommu_groups/16/devices/0000:01:00.0
/sys/kernel/iommu_groups/34/devices/0000:0f:00.0
/sys/kernel/iommu_groups/6/devices/0000:00:16.0
/sys/kernel/iommu_groups/6/devices/0000:00:16.3
/sys/kernel/iommu_groups/24/devices/0000:04:00.0
/sys/kernel/iommu_groups/14/devices/0000:00:1f.2
/sys/kernel/iommu_groups/14/devices/0000:00:1f.0
/sys/kernel/iommu_groups/14/devices/0000:00:1f.3
/sys/kernel/iommu_groups/14/devices/0000:00:1f.4
/sys/kernel/iommu_groups/32/devices/0000:0a:00.0
/sys/kernel/iommu_groups/4/devices/0000:00:14.2
/sys/kernel/iommu_groups/4/devices/0000:00:14.0
/sys/kernel/iommu_groups/22/devices/0000:03:00.2
/sys/kernel/iommu_groups/12/devices/0000:00:1c.1
/sys/kernel/iommu_groups/30/devices/0000:09:07.0
/sys/kernel/iommu_groups/2/devices/0000:00:01.0
/sys/kernel/iommu_groups/20/devices/0000:03:00.0
/sys/kernel/iommu_groups/10/devices/0000:00:1b.3
/sys/kernel/iommu_groups/39/devices/i2c_designware.1
/sys/kernel/iommu_groups/29/devices/0000:09:05.0
/sys/kernel/iommu_groups/0/devices/0000:00:02.0
/sys/kernel/iommu_groups/19/devices/0000:02:10.0
/sys/kernel/iommu_groups/37/devices/i2c_designware.0
/sys/kernel/iommu_groups/9/devices/0000:00:1b.2
/sys/kernel/iommu_groups/27/devices/0000:09:01.0

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