[Bug 1961305] Re: Cannot boot into Xen dom0

[Benjamin Drung]

Thank you for taking the time to report this bug and helping to make
Ubuntu better. I just tested linux-generic-hwe-20.04 and it has
CONFIG_KERNEL_ZSTD=y set and the generated initrd is compressed with
zstd:

```
$ 3cpio -e /boot/initrd.img-6.8.0-45-generic 
0	cpio
77312	cpio
8044032	zstd
```

What is your initrd config?

grep -Ev '^(#|$)' /etc/initramfs-tools/initramfs.conf

** Changed in: initramfs-tools (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1961305

Title:
  Cannot boot into Xen dom0

Status in initramfs-tools package in Ubuntu:
  Incomplete

Bug description:
  Description:	Ubuntu 20.04.3 LTS
  Release:	20.04

  The linux-generic-hwe-20.04 5.13 Kernels are compiled with

  #CONFIG_KERNEL_GZIP is not set
  CONFIG_KERNEL_ZSTD=y

  preventing Xen 4.13.x / 4.14.x from booting into Dom0. After compiling
  the kernel by myself using

  CONFIG_KERNEL_GZIP=y
  #CONFIG_KERNEL_ZSTD is not set

  it works as expected. Kernel boots and Xen is working as intended.
  Please revert to CONFIG_KERNEL_GZIP=y like in the former HWE (5.11?)
  series not having this problem.

  Thank you

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