On Sat, Aug 14, 2021 at 6:21 PM Valdis Klētnieks <valdis.kletnieks@xxxxxx> wrote: > > On Fri, 13 Aug 2021 18:08:38 -0600, jim.cromie@xxxxxxxxx said: > > > then I added BTRFS_FS, since thats the host fs. > > of course it didnt work. > > > VFS: Cannot open root device "(null)" or unknown-block(0,0): error -2 > > Please append a correct "root=" boot option; here are the available partitions: > > Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) > > CPU: 0 PID: 1 Comm: swapper Tainted: G W 5.14.0-rc4+ #5 > > And it didn't find any usable btrfs (or other fs it knew about) > > > Heres a working kernel (if overlarge config) > > > VFS: Mounted root (9p filesystem) readonly on device 0:20. > > > Anybody see any clues ? > > That '9p filesystem' should be a really big clue. If that's the root fs that you > actually want to use, you need to do two things: > > a) point at it with root= > b) have 9p filesystem support in the kernel the part you trimmed out contained this, I think it means I had those particular modules built-in correctly 9pnet: Installing 9P2000 support sched_clock: Marking stable (3466602654, 29303733)->(4050551166, -554644779) Btrfs loaded, crc32c=crc32c-generic, zoned=no 9pnet_virtio: no channels available for device /dev/root that last line is where it skipped the track. so I really have to understand how virtme is doing its magic. fwiw, it looks like its somewhere in this command line ./.virtme_mods/lib/modules/0.0.0 /usr/bin/qemu-system-x86_64 -fsdev local,id=virtfs1,path=/,security_model=none,readonly,multidevs=remap -device virtio-9p-pci,fsdev=virtfs1,mount_tag=/dev/root -fsdev local,id=virtfs5,path=/usr/local/lib/python3.9/site-packages/virtme-0.1.1-py3.9.egg/virtme/guest,security_model=none,readonly,multidevs=remap -device virtio-9p-pci,fsdev=virtfs5,mount_tag=virtme.guesttools -machine accel=kvm:tcg -watchdog i6300esb -cpu host -parallel none -net none -echr 1 -serial none -chardev stdio,id=console,signal=off,mux=on -serial chardev:console -mon chardev=console -vga none -display none -kernel ./arch/x86/boot/bzImage -append 'virtme_link_mods=/home/jimc/projects/lx/wk-next/builds/local-i915m/.virtme_mods/lib/modules/0.0.0 earlyprintk=serial,ttyS0,115200 console=ttyS0 psmouse.proto=exps "virtme_stty_con=rows 24 cols 108 iutf8" TERM=xterm-256color rootfstype=9p rootflags=version=9p2000.L,trans=virtio,access=any,msize=200M raid=noautodetect ro nokaslr dynamic_debug.verbose=3 module.dyndbg=+pmf init=/bin/sh -- -c "mount -t tmpfs run /run;mkdir -p /run/virtme/guesttools;/bin/mount -n -t 9p -o ro,version=9p2000.L,trans=virtio,access=any,msize=104857600 virtme.guesttools /run/virtme/guesttools;exec /run/virtme/guesttools/virtme-init"' -machine dump-guest-core=on -m 2G --smp 3 Wrong EFI loader signature. early console in extract_kernel btw, I will go back and look for more 9P options. and more VIRT options thanks _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
