Some AMD EPYC VCPUs generated boot message of the type:
pci4: <unknown> at device 0.0 (no driver attached)
These are displayed for device class 0x13 devices, e.g.:
none8@pci0:130:0:0: class=0x130000 rev=0x00 hdr=0x00 vendor=0x1022 \
device=0x148a subvendor=0x1022 subdevice=0x148a
vendor = 'Advanced Micro Devices, Inc. [AMD]'
device = 'Starship/Matisse PCIe Dummy Function'
class = non-essential instrumentation
Since these devices serve no purpose (no driver attaches) I have
enabled the reporting of suich devices only for verbose boots (a
diversion from the patch provided in the PR).
A verbose boot will now display such devices as:
pci4: <non-essential instrumentation> at device 0.0 (no driver attached)
PR: 263469
Reported by: jfc@mit.edu (John F. Carr)
MFC after: 1 week
f010b9c2b9