[Bug 1952599] Re: virt: Support detection for ARM64 Hyper-V guests (fixed upstream)

[Launchpad Bug Tracker]

This bug was fixed in the package systemd - 245.4-4ubuntu3.14

---------------
systemd (245.4-4ubuntu3.14) focal; urgency=medium

  [ Lukas Märdian ]
  * Allow target units to fail (LP: #1948476)
    File: d/p/lp1948476-pid1-target-units-can-fail-through-dependencies.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=fe0cb0bd66baea89d8bbe47cb47d88540f46d470
  * Fix whitespace in lp1926547-hwdb-60-keyboard-Update-Dell-Privacy-Micmute-Hotkey-.patch to match upstream
    File: debian/patches/lp1926547-hwdb-60-keyboard-Update-Dell-Privacy-Micmute-Hotkey-.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=80fef80a1b018556939011707c4ce00cebc58806
  * Support detection for ARM64 Hyper-V guests (LP: #1952599)
    Files:
    - debian/patches/lp1952599/0001-virt-Support-detection-for-ARM64-Hyper-V-guests.patch
    - debian/patches/lp1952599/0002-virt-Fix-the-detection-for-Hyper-V-VMs.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=caf3aff933cc7bf21565faba05f78ce78b3196cd

  [ Andy Chi ]
  * Add privacy micmute hotkey for Dell machine. (LP: #1952733)
    File: debian/patches/lp1952733-hwdb-60-keyboard-Update-Dell-Privacy-Micmute-Hotkey-Map.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=ff8dc41f55baa418076e42509ddbf3212a8c1353
  * Add microphone mute key for Dell machine. (LP: #1952735)
    File: debian/patches/lp1952735-keymap-Add-microphone-mute-keymap-for-Dell-Machine.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=175fb4e209fba889b4bcd81cb2ed262923943a3f

  [ Yao Wei ]
  * Add ACCEL_LOCATION=base property for 6 Dell clamshell models (LP: #1943561)
    File: debian/patches/lp1943561-dell-clamshell-accel-location-base-with-sku.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=246195d68b2bb0473f4a3f1c2ebe54dfd37f068b

  [ Dan Streetman ]
  * d/p/lp1944711-login-filenames-in-run-systemd-users-are-uids.patch:
    Fix systemd-logind restart loading of existing sessions
    (LP: #1944711)

  [ Ratchanan Srirattanamet ]
  * d/p/debian/timedatectl-lp1650688.patch,
    d/p/debian/UBUNTU-Fix-timezone-setting-on-read-only-etc.patch:
    Fix timedated unable to retrieve & properly set timezone on
    read-only /etc (e.g. Ubuntu Core and system-image-based systems)
    (LP: #1650688)

 -- Lukas Märdian <slyon at ubuntu.com>  Fri, 10 Dec 2021 10:04:02 +0100

** Changed in: systemd (Ubuntu Focal)
       Status: Fix Committed => Fix Released

** Changed in: systemd (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1952599

Title:
  virt: Support detection for ARM64 Hyper-V guests (fixed upstream)

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Bionic:
  Fix Released
Status in systemd source package in Focal:
  Fix Released
Status in systemd source package in Hirsute:
  New
Status in systemd source package in Impish:
  Fix Released
Status in systemd source package in Jammy:
  Fix Released

Bug description:
  [Impact]

   * The detection of Microsoft Hyper-V VMs is done by cpuid currently,
  however there is no cpuid on ARM64. And since ARM64 is now a supported
  architecture for Microsoft Hyper-V guests[0], then introduce a more
  generic way to detect whether a guest is running as a Hyper-V guest: check 
  if /sys/class/dmi/id/product_version starts with "Hyper-V".

   * This bug has already been fixed upstream[1][2]

  [Test Plan]

   * While changes have been made in the kernel for ARM64 on Hyper-V,
  there is no way to start an ARM64 VM on Hyper-V at the moment. Thus we
  just want to make sure no regression is introduced.

   * start an Hyper-V amd64 VM and make sure "systemd-detect-virt" still
  return MSFT (should still rely on cpuid here)

  [Where problems could occur]

   * The main risk is for the system to detect Hyper-V virt erroneously.
  An issue was reported upstream after the first commit was merged[3].
  For this reason, systemd is now looking for "Hyper-V" (in
  /sys/class/dmi/id/product_version) and not "Microsoft" (in
  /sys/class/dmi/id/bios_vendor)

   * This change might also break virt detection on hyper-v AMD64.
  That's why we need testing. However, AMD64 virt detection should still
  rely on cpuid instead of DMI as cpuid takes priority over DMI.

  [0] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7aff79e297ee1aa0126924921fd87a4ae59d2467
  [1] https://github.com/systemd/systemd/pull/20998/files
  [2] https://github.com/systemd/systemd/pull/21475/files
  [3] https://github.com/systemd/systemd/issues/21468

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