Closed LaszloGombos closed 3 months ago
Enhance the qemu dracut module so that it can extend the command line that was passed in when Linux kernel started.
This can happen either using the fw_cfg or smbios qemu arguments.
-fw_cfg name=opt/io.dracut.cmdline-extra,string=ro
-smbios type=11,value=io.dracut.cmdline-extra:ro
See https://www.qemu.org/docs/master/specs/fw_cfg.html and https://www.qemu.org/docs/master/system/invocation.html#hxtool-4
systemd has similar feature for credential management - https://github.com/systemd/systemd/blob/main/docs/CREDENTIALS.md?plain=1#L53
When qemu is used with UKI (and not Direct Linux Boot), -append command line option is not available to control kernel command line arguments.
To read the value from within the guest passed in via qemu cat /sys/firmware/qemu_fw_cfg/by_name/opt/io.dracut.cmdline-extra/raw
cat /sys/firmware/qemu_fw_cfg/by_name/opt/io.dracut.cmdline-extra/raw
Enhance the qemu dracut module so that it can extend the command line that was passed in when Linux kernel started.
This can happen either using the fw_cfg or smbios qemu arguments.
-fw_cfg name=opt/io.dracut.cmdline-extra,string=ro-smbios type=11,value=io.dracut.cmdline-extra:roSee https://www.qemu.org/docs/master/specs/fw_cfg.html and https://www.qemu.org/docs/master/system/invocation.html#hxtool-4
systemd has similar feature for credential management - https://github.com/systemd/systemd/blob/main/docs/CREDENTIALS.md?plain=1#L53
When qemu is used with UKI (and not Direct Linux Boot), -append command line option is not available to control kernel command line arguments.
To read the value from within the guest passed in via qemu
cat /sys/firmware/qemu_fw_cfg/by_name/opt/io.dracut.cmdline-extra/raw