[Bug 291768] bhyve won't boot anything on 15.0 - AMD EPYC 9124

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291768

            Bug ID: 291768
           Summary: bhyve won't boot anything on 15.0 - AMD EPYC 9124
           Product: Base System
           Version: 15.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bhyve
          Assignee: virtualization@FreeBSD.org
          Reporter: marko.cupac@mimar.rs

Hi,

I can't boot existing or install new VMs on 15-RELEASE-p1 on two identical
servers, Supermicro with AMD EPYC 9124 CPUs. Works fine on 14.3-RELEASE-p6 on
same hardware.

On another hardware, HP Z Workstation with 13th Gen Intel Core i7-13700K, I can
boot and install VMs on both 15-RELEASE-p1 and 14.3-RELEASE-p6.

I use boot environments so I can switch between 14.3 and 15.0 easily.

All my VMs are FreeBSD 14.3 and 15.0, uefi mode, nvme disks:

loader="uefi"
cpu=2
memory=2G
network0_type="virtio-net"
network0_switch="public"
disk0_type="nvme"
disk0_name="disk0.img"
uuid="UID"
network0_mac="MAC"

VM starts, stays running, but gives nothing on console. Turning on graphics /
VNC serves black screen.

Changing loader to bhyvectl shows FreeBSD booting on console but hangs at:

/boot/kernel/kernel text=0x180078 text=0xd97948 text=0x43a46b data=0x180+0xe80
data=0x187590+0x478a70 0x8+0x18e940+0x8+0x1b2b03/
Loading configured modules...
can't find '/boot/entropy'
can't find '/etc/hostid'

Thank you in advance,

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