Public bug reported:
I have a system with a ZFS root (/) and which boots xen. The generated
grub.cfg kernel command line is ok for a non-xen boot but is missing the
pool name from the xen entries. Since upgrading from 18.04 it is
necessary to modify the command line via the grub editor during boot or
edit grub.cfg directly.
i.e. direct linux looks like:
linux /vmlinuz-5.4.0-40-generic root=ZFS=rpool/ROOT/ubuntu ro
and xen entries look like:
module2 /vmlinuz-5.4.0-33-generic placeholder root=ZFS=/ROOT/ubuntu ro
console=hvc0 console=tty0 earlyprintk=xen
grub's 10_linux includes this block:
# We have a more specialized ZFS handler, with multiple system in
10_linux_zfs.
if [ -e "`dirname $(readlink -f $0)`/10_linux_zfs" ]; then
exit 0
fi
but no similar provision for systems booting xen has been made.
# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04 LTS
Release: 20.04
Codename: focal
# apt-cache policy grub-common
grub-common:
Installed: 2.04-1ubuntu26
Candidate: 2.04-1ubuntu26
Version table:
*** 2.04-1ubuntu26 500
500 http://gb.archive.ubuntu.com/ubuntu focal/main amd64 Packages
100 /var/lib/dpkg/status
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1888400
Title:
grub-common: root on zfs incorrect grub command for xen boots
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