Public bug reported: [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 ** Affects: systemd (Ubuntu) Importance: Undecided Status: New ** Affects: systemd (Ubuntu Bionic) Importance: Undecided Status: New ** Affects: systemd (Ubuntu Focal) Importance: Undecided Status: New ** Affects: systemd (Ubuntu Hirsute) Importance: Undecided Status: New ** Affects: systemd (Ubuntu Impish) Importance: Undecided Status: New ** Affects: systemd (Ubuntu Jammy) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1952599 Title: virt: Support detection for ARM64 Hyper-V guests (fixed upstream) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1952599/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
