Bug#1028511: initramfs-tools: Please include `hyperv-keyboard` to enter LUKS password in Gen2 Hyper-V machines

From	Arnaud Rebillout <arnaudr@kali.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1028511: initramfs-tools: Please include `hyperv-keyboard` to enter LUKS password in Gen2 Hyper-V machines
Date	2023-01-12 08:10 +0100
Message-ID	<FMZSN-hqlg-3@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Package: initramfs-tools
Version: 0.142
Severity: normal
Tags: patch
User: devel@kali.org
Usertags: origin-kali

Dear Maintainer,

As reported in the Kali Linux bug tracker, it's not possible to type the
LUKS password, in case of full disk encryption, in Gen2 Hyper-V virtual
machine. This is due to missing modules.

The original bug is at https://bugs.kali.org/view.php?id=7846, and I'll
quote the bits that are relevant:

> Because Generation 2 virtual machines in Hyper-V are presented with a
> minimal set of EFI hardware, the kernel module "hyperv_keyboard" must
> be present to interact with the console keyboard. On systems with disk
> encryption, the user will be prompted for the key to decrypt the disk,
> but cannot enter the password because no keyboard driver is present.
>
> [...]
>
> This module *is* present when the grub menu is presented and later
> when the kernel is fully loaded.  FYI, if some mechanism requires a
> mouse or touch, the hid_hyperv module will also be needed.

This issue also affects Debian, as discussed in:
<https://forums.debian.net/viewtopic.php?t=131468>

This issue was also reported in the Ubuntu tracker, back in 2016:
<https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1567107>
It was fixed in Ubuntu, but the changes never made it to Debian.

Please find a merge request at:
<https://salsa.debian.org/kernel-team/initramfs-tools/-/merge_requests/69>

Thanks,

  Arnaud

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Bug#1028511: initramfs-tools: Please include `hyperv-keyboard` to enter LUKS password in Gen2 Hyper-V machines Arnaud Rebillout <arnaudr@kali.org> - 2023-01-12 08:10 +0100
  Bug#1028511: A workaround "Jinesh Choksi" <jinesh@onelittlehope.com> - 2023-06-11 23:00 +0200

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