Solution: compile kernel for Hyper-V VM

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Hallo dear list,

after some failures where I didn't really know how to proceed I finally had=
 a breakthrough yesterday.

Funny thing is: I tried to get help from Copilot, and although all of its s=
uggestions were basically useless they pointed me in the right direction to=
 continue. The AI always congratulated me at every step, and assured me "th=
at's the last missing clue" but it always failed.

I had 2 problems to solve, one not so much LFS-related, the other not at al=
l: I still wanted to continue with Fedora's grub (my hostsystem for the ini=
tial build), and the kernel configuration.

First I simply added my LFS partition to the boot menu, and grub did not ev=
en *try* to start loading the kernel, it just sat there and nothing happene=
d.
I switched off the "BLS" method where grub uses config files in /boot/loade=
r/entries to define each bootable option, and replaced it with a minimal gr=
ub.cfg - this worked.

Then I found out that not only had I have to enable all of the CONFIG_HYPER=
V_* kernel settings and have them compiled into the kernel as static module=
s (so choose y not m), I had to make them visible in make menuconfig. Previ=
ously I simply edited the .config file with vi, changing all from "# ... is=
 not set" to "=3Dy".

After getting the kernel to load I got the usual kernel panic for "no root =
device" which means the storage driver for the "hardware" is not compiled i=
n. But I was sure I had included CONFIG_HYPERV_STORAGE into .config manuall=
y with an echo >> command, but I could not find it anymore after building t=
he kernel. So I ran make menuconfig and used / to search for the keyword. I=
t was there, but I could not navigate to it. I had to enable the upper leve=
ls of menu choices (it is under low level SCSI drivers).

This might sound obvious to experienced kernel compiler folk but to me it w=
as news. If the upper-level option in the config tree is not enabled the ke=
rnel will not look at the settings in the lower decks.

Stay healthy,
Thomas
--=20
"Do you wanna be a legend or a passing footprint on the sands of time?"

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