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

[Łukasz Zemczak]

Hello Gauthier, or anyone else affected,

Accepted systemd into focal-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/systemd/245.4-4ubuntu3.14 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
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** Changed in: systemd (Ubuntu Focal)
       Status: New => Fix Committed

** Tags added: verification-needed-focal

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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:
  New
Status in systemd source package in Focal:
  Fix Committed
Status in systemd source package in Hirsute:
  New
Status in systemd source package in Impish:
  Fix Committed
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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