[Bug 277326] FreeBSD guest on QEMU with Hyper-V enlightenment on is no longer able to detect Hyper-V devices

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 26 Feb 2024 09:56:12 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277326

            Bug ID: 277326
           Summary: FreeBSD guest on QEMU with Hyper-V enlightenment on is
                    no longer able to detect Hyper-V devices
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: zlei@FreeBSD.org

With recent change 6744fd8e7503 (x86/cpu: improve hypervisor detection),
FreeBSD guest on QEMU with Hyper-V enlightenment on detects the hypervisor(KVM)
correctly, but the emulated Hyper-V devices are no longer be detected during
boot.

Highlight the diff:

< Hyper-V Version: 10.0.14393 [SP0]
<   Features=0x27e<TMREFCNT,SYNIC,SYNTM,APIC,HYPERCALL,VPINDEX,REFTSC>
<   PM Features=0x0 [C0]
<   Features3=0x8<PCPUDPE>
< Timecounter "Hyper-V" frequency 10000000 Hz quality 2000
< Timecounter "Hyper-V-TSC" frequency 10000000 Hz quality 3000
< vmbus0: <Hyper-V Vmbus> on pcib0

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