** Changed in: linux-kvm (Ubuntu Jammy)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/2045561
Title:
linux-kvm: please enable CONFIG_DMI_SYSFS for SMBIOS support
Status in linux-kvm package in Ubuntu:
New
Status in linux-kvm source package in Jammy:
Confirmed
Status in linux-kvm source package in Mantic:
Won't Fix
Status in linux-kvm source package in Noble:
Won't Fix
Bug description:
SRU Justification
[Impact]
The kvm flavours currently do not enable CONFIG_DMI_SYSFS. This stops
VMs using these kernels from being configurable using qemu or cloud-
hypervisor's SMBIOS type 11 strings. This feature is supported and
used widely by systemd:
https://www.freedesktop.org/software/systemd/man/latest/smbios-type-11.html
https://systemd.io/CREDENTIALS/
A user launching a VM using the linux-kvm kernel image is not able to
specify SMBIOS strings to automatically configured userspace services
and programs due to the lack of this kconfig. We make extensive use of
these in systemd's upstream CI, which is running on Github Actions,
which uses Jammy, so it would be great to have this kconfig enabled
and backported.
For example:
qemu-system-x86_64 \
-machine type=q35,accel=kvm,smm=on \
-smp 2 \
-m 1G \
-cpu host \
-nographic \
-nodefaults \
-serial mon:stdio \
-drive if=none,id=hd,file=ubuntu_jammy.raw,format=raw \
-device virtio-scsi-pci,id=scsi \
-device scsi-hd,drive=hd,bootindex=1 \
-smbios type=11,value=io.systemd.credential:mycred=supersecret
[Fix]
Please consider enabling the following kconfigs:
CONFIG_DMI_SYSFS
These are already enabled in the 'main' kernel config, and in other
distros.
To verify this works, it is sufficient to check that the
/sys/firmware/dmi/entries/ directory in sysfs is present:
$ ls /sys/firmware/dmi/entries/
0-0 126-1 126-4 126-8 130-0 133-0 136-0 140-2 15-0 18-0 21-1
221-1 24-0 7-1 8-2 8-6
1-0 126-10 126-5 126-9 131-0 134-0 14-0 140-3 16-0 19-0 219-0
221-2 3-0 7-2 8-3 9-0
12-0 126-2 126-6 127-0 131-1 135-0 140-0 140-4 17-0 2-0 22-0
221-3 4-0 8-0 8-4 9-1
126-0 126-3 126-7 13-0 132-0 135-1 140-1 14-1 17-1 21-0 221-0
222-0 7-0 8-1 8-5
Without this kconfig, the directory won't be there. Once enabled, it
will be there.
[Regression Potential]
Enabling a new DMI option could affect the DMI subsystem in unforeseen
ways.
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https://bugs.launchpad.net/ubuntu/+source/linux-kvm/+bug/2045561/+subscriptions
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