I'm playing around, trying to use 'systemctl kexec' for faster reboots.
Thus far, I haven't been able to get it to work; I'm always getting a
"normal" reboot (including the firmware POST).
My system (Fedora 42) is using UEFI boot, with secure boot disabled.
systemd-boot is the bootloader.
$ sudo bootctl --no-pager
System:
Firmware: UEFI 2.40 (American Megatrends 5.10)
Firmware Arch: x64
Secure Boot: disabled (setup)
TPM2 Support: no
Measured UKI: no
Boot into FW: supported
Current Boot Loader:
Product: systemd-boot 257.7-1.fc42
Features: ✓ Boot counting
✓ Menu timeout control
✓ One-shot menu timeout control
✓ Default entry control
✓ One-shot entry control
✓ Support for XBOOTLDR partition
✓ Support for passing random seed to OS
✓ Load drop-in drivers
✓ Support Type #1 sort-key field
✓ Support @saved pseudo-entry
✓ Support Type #1 devicetree field
✓ Enroll SecureBoot keys
✓ Retain SHIM protocols
✓ Menu can be disabled
✓ Multi-Profile UKIs are supported
✓ Boot loader set partition information
Partition: /dev/disk/by-partuuid/e3cdac2c-91c9-4be9-abdd-b97a9dea16f0
Loader: └─/EFI/SYSTEMD/SYSTEMD-BOOTX64.EFI
Current Entry: e74ab0d2949c479eb03abdab1b1acd41-6.15.9-201.fc42.x86_64.conf
Random Seed:
System Token: set
Exists: yes
Available Boot Loaders on ESP:
ESP: /efi (/dev/disk/by-partuuid/e3cdac2c-91c9-4be9-abdd-b97a9dea16f0)
File: ├─/EFI/systemd/systemd-bootx64.efi (systemd-boot 257.7-1.fc42)
├─/EFI/BOOT/BOOTX64.EFI (systemd-boot v245.8-2.fc32)
├─/EFI/BOOT/fallback.efi
└─/EFI/BOOT/fbx64.efi
Boot Loaders Listed in EFI Variables:
Title: Linux
ID: 0x0000
Status: active, boot-order
Partition: /dev/disk/by-partuuid/e3cdac2c-91c9-4be9-abdd-b97a9dea16f0
File: └─/EFI/SYSTEMD/SYSTEMD-BOOTX64.EFI
Title: Windows Boot Manager
ID: 0x0005
Status: active, boot-order
Partition: /dev/disk/by-partuuid/e3cdac2c-91c9-4be9-abdd-b97a9dea16f0
File: └─/EFI/MICROSOFT/BOOT/BOOTMGFW.EFI
Boot Loader Entries:
$BOOT: /efi (/dev/disk/by-partuuid/e3cdac2c-91c9-4be9-abdd-b97a9dea16f0)
token: fedora
Default Boot Loader Entry:
type: Boot Loader Specification Type #1 (.conf)
title: Fedora Linux 42 (Adams) (6.15.9-201.fc42.x86_64)
id: e74ab0d2949c479eb03abdab1b1acd41-6.15.9-201.fc42.x86_64.conf
source:
/efi//loader/entries/e74ab0d2949c479eb03abdab1b1acd41-6.15.9-201.fc42.x86_64.conf
(on the EFI System Partition)
sort-key: fedora
version: 6.15.9-201.fc42.x86_64
machine-id: e74ab0d2949c479eb03abdab1b1acd41
linux:
/efi//e74ab0d2949c479eb03abdab1b1acd41/6.15.9-201.fc42.x86_64/linux
initrd:
/efi//e74ab0d2949c479eb03abdab1b1acd41/6.15.9-201.fc42.x86_64/initrd
options: root=/dev/mapper/vg_breadbox-lv_fedora ro
rd.lvm.lv=vg_breadbox/lv_fedora elevator=deadline intel_iommu=on
systemd.machine_id=e74ab0d2949c479eb03abdab1b1acd41
I don't see any obviously fatal errors when I do a dry run.
$ sudo SYSTEMD_LOG_LEVEL=debug systemctl --dry-run kexec
Bus n/a: changing state UNSET → OPENING
sd-bus: starting bus by connecting to /run/dbus/system_bus_socket...
Bus n/a: changing state OPENING → AUTHENTICATING
Bus n/a: changing state AUTHENTICATING → HELLO
Sent message type=method_call sender=n/a destination=org.freedesktop.DBus
path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=Hello cookie=1
reply_cookie=0 signature=n/a error-name=n/a error-message=n/a
Got message type=method_return sender=org.freedesktop.DBus destination=:1.17
path=n/a interface=n/a member=n/a cookie=4294967295 reply_cookie=1 signature=s
error-name=n/a error-message=n/a
Bus n/a: changing state HELLO → RUNNING
Sent message type=method_call sender=n/a destination=org.freedesktop.login1
path=/org/freedesktop/login1 interface=org.freedesktop.login1.Manager
member=ListInhibitors cookie=2 reply_cookie=0 signature=n/a error-name=n/a
error-message=n/a
Got message type=method_return sender=:1.2 destination=:1.17 path=n/a
interface=n/a member=n/a cookie=33 reply_cookie=2 signature=a(ssssuu)
error-name=n/a error-message=n/a
Found container virtualization none.
/dev/sda2: Partition has wrong
PART_ENTRY_TYPE=0fc63daf-8483-4772-8e79-3d69d8477de4 for XBOOTLDR partition.
Reading EFI variable
/sys/firmware/efi/efivars/LoaderEntryOneShot-4a67b082-0a4c-41cf-b6c7-440b29bb8c4f.
open("/sys/firmware/efi/efivars/LoaderEntryOneShot-4a67b082-0a4c-41cf-b6c7-440b29bb8c4f")
failed: No such file or directory
Reading EFI variable
/sys/firmware/efi/efivars/LoaderEntryDefault-4a67b082-0a4c-41cf-b6c7-440b29bb8c4f.
open("/sys/firmware/efi/efivars/LoaderEntryDefault-4a67b082-0a4c-41cf-b6c7-440b29bb8c4f")
failed: No such file or directory
Reading EFI variable
/sys/firmware/efi/efivars/LoaderEntrySelected-4a67b082-0a4c-41cf-b6c7-440b29bb8c4f.
Found default: id "e74ab0d2949c479eb03abdab1b1acd41-6.15.9-201.fc42.x86_64.conf" is
matched by pattern "e74ab0d2949c479eb03abdab1b1acd41-*"
Found default boot loader entry in file
"/efi/loader/entries/e74ab0d2949c479eb03abdab1b1acd41-6.15.9-201.fc42.x86_64.conf"
Would run /usr/sbin/kexec --load
"/efi/e74ab0d2949c479eb03abdab1b1acd41/6.15.9-201.fc42.x86_64/linux" --append
"root=/dev/mapper/vg_breadbox-lv_fedora ro rd.lvm.lv=vg_breadbox/lv_fedora elevator=deadline
intel_iommu=on systemd.machine_id=e74ab0d2949c479eb03abdab1b1acd41" --initrd
"/efi/e74ab0d2949c479eb03abdab1b1acd41/6.15.9-201.fc42.x86_64/initrd"
Would set wall message "".
Would execute org.freedesktop.login1.Manager RebootWithFlags dbus call.
Bus n/a: changing state RUNNING → CLOSED
Nonetheless, running 'systemctl kexec' is doing a normal reboot,
including the firmware POST.
Any pointers on how to troubleshoot this further would be appreciated.
Thanks!
--
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If your user interface is intuitive in retrospect ... it isn't intuitive
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