Causes KVM/libvirt failure for VMs with PCI passthrough as the driver cannot be
switched to vfio since all drives fall into group 0 along with bridge devices,
eg:
Group 0: [1022:14da] 00:01.0 Host bridge
Device 14da
[1022:14db] [R] 00:01.1 PCI bridge
Device 14db
[1022:14db] [R] 00:01.3 PCI bridge
Device 14db
[1022:14db] [R] 00:01.4 PCI bridge
Device 14db
[1022:14db] [R] 00:01.5 PCI bridge
Device 14db
[144d:a80a] [R] 01:00.0 Non-Volatile memory controller
NVMe SSD Controller PM9A1/PM9A3/980PRO
[144d:a80a] [R] 02:00.0 Non-Volatile memory controller
NVMe SSD Controller PM9A1/PM9A3/980PRO
[144d:a80a] [R] 03:00.0 Non-Volatile memory controller
NVMe SSD Controller PM9A1/PM9A3/980PRO
[144d:a80a] [R] 04:00.0 Non-Volatile memory controller
NVMe SSD Controller PM9A1/PM9A3/980PRO
With 6.8.0-124 and earlier:
Group 14: [144d:a80a] [R] 01:00.0 Non-Volatile memory controller
NVMe SSD Controller PM9A1/PM9A3/980PRO
Group 15: [144d:a80a] [R] 02:00.0 Non-Volatile memory controller
NVMe SSD Controller PM9A1/PM9A3/980PRO
Group 16: [144d:a80a] [R] 03:00.0 Non-Volatile memory controller
NVMe SSD Controller PM9A1/PM9A3/980PRO
Group 17: [144d:a80a] [R] 04:00.0 Non-Volatile memory controller
NVMe SSD Controller PM9A1/PM9A3/980PRO
vendor_id : AuthenticAMD
cpu family : 25
model : 97
model name : AMD EPYC 4464P 12-Core Processor
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https://bugs.launchpad.net/bugs/2159786
Title:
IOMMU Grouping bug in 6.8.0-134 generic kernel
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