Hi again,
I'm happy to report that with the fix committed by Jonathan, the VM
now happily boots today's snapshot.
dmesg below.
Thanks a lot,
Sebastian
On Fri, 2 Oct 2026, Jonathan Gray wrote:
> > The limited AMD documentation on mitigations does not mention
> > hypervisors at all.
> >
> > It seems we can only assume hypervisors implement all workarounds.
> > And don't implement most MSRs.
>
> Thanks for the report, I've committed the diff below.
OpenBSD 8.0 (GENERIC.MP) #75: Fri Oct 2 02:32:35 MDT 2026
[email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 25752858624 (24559MB)
avail mem = 24947425280 (23791MB)
random: good seed from bootblocks
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.8 @ 0xf6150 (11 entries)
bios0: vendor SeaBIOS version "1.11.0-2.vz7.5" date 04/01/2014
bios0: Virtuozzo KVM
acpi0 at bios0: ACPI 1.0
acpi0: sleep states S5
acpi0: tables DSDT FACP APIC HPET
acpi0: wakeup devices
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: AMD EPYC Processor (with IBPB), 2495.45 MHz, 17-01-02
cpu0: cpuid 1
edx=178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,HTT>
ecx=f7f83203<SSE3,PCLMUL,SSSE3,FMA3,CX16,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,HV>
cpu0: cpuid 6 eax=4<ARAT>
cpu0: cpuid 7.0
ebx=219c01ab<FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,RDSEED,ADX,SMAP,CLFLUSHOPT,CLWB,SHA>
ecx=4<UMIP>
cpu0: cpuid d.1 eax=7<XSAVEOPT,XSAVEC,XGETBV1>
cpu0: cpuid 80000001 edx=2fd3fbff<NXE,MMXX,FFXSR,PAGE1GB,RDTSCP,LONG>
ecx=4003f3<LAHF,CMPLEG,AMCR8,ABM,SSE4A,MASSE,3DNOWP,OSVW,TOPEXT>
cpu0: cpuid 80000008 ebx=2001000<IBPB,VIRTSSBD>
cpu0: 32KB 64b/line 8-way D-cache, 64KB 64b/line 4-way I-cache, 512KB
64b/line 8-way L2 cache, 8MB 64b/line 16-way L3 cache
cpu0: smt 0, core 0, package 0, type P
mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges
cpu0: apic clock running at 1000MHz
cpu1 at mainbus0: apid 1 (application processor)
cpu1: AMD EPYC Processor (with IBPB), 2495.67 MHz, 17-01-02
cpu1: smt 0, core 0, package 1, type P
cpu2 at mainbus0: apid 2 (application processor)
cpu2: AMD EPYC Processor (with IBPB), 2495.54 MHz, 17-01-02
cpu2: smt 0, core 0, package 2, type P
cpu3 at mainbus0: apid 3 (application processor)
cpu3: AMD EPYC Processor (with IBPB), 2495.57 MHz, 17-01-02
cpu3: smt 0, core 0, package 3, type P
cpu4 at mainbus0: apid 4 (application processor)
cpu4: AMD EPYC Processor (with IBPB), 2495.48 MHz, 17-01-02
cpu4: smt 0, core 0, package 4, type P
cpu5 at mainbus0: apid 5 (application processor)
cpu5: AMD EPYC Processor (with IBPB), 2495.72 MHz, 17-01-02
cpu5: smt 0, core 0, package 5, type P
cpu6 at mainbus0: apid 6 (application processor)
cpu6: AMD EPYC Processor (with IBPB), 2495.83 MHz, 17-01-02
cpu6: smt 0, core 0, package 6, type P
cpu7 at mainbus0: apid 7 (application processor)
cpu7: AMD EPYC Processor (with IBPB), 2495.54 MHz, 17-01-02
cpu7: smt 0, core 0, package 7, type P
ioapic0 at mainbus0: apid 0 pa 0xfec00000, version 11, 24 pins
acpihpet0 at acpi0: 100000000 Hz
acpiprt0 at acpi0: bus 0 (PCI0)
"ACPI0006" at acpi0 not configured
acpipci0 at acpi0 PCI0
acpicmos0 at acpi0
"PNP0303" at acpi0 not configured
"PNP0F13" at acpi0 not configured
"QEMU0001" at acpi0 not configured
"PNP0A06" at acpi0 not configured
"PNP0A06" at acpi0 not configured
"PNP0A06" at acpi0 not configured
"QEMU0002" at acpi0 not configured
"ACPI0010" at acpi0 not configured
acpicpu0 at acpi0: C1(@1 halt!)
acpicpu1 at acpi0: C1(@1 halt!)
acpicpu2 at acpi0: C1(@1 halt!)
acpicpu3 at acpi0: C1(@1 halt!)
acpicpu4 at acpi0: C1(@1 halt!)
acpicpu5 at acpi0: C1(@1 halt!)
acpicpu6 at acpi0: C1(@1 halt!)
acpicpu7 at acpi0: C1(@1 halt!)
pvbus0 at mainbus0: KVM
pvclock0 at pvbus0
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel 82441FX" rev 0x02
pcib0 at pci0 dev 1 function 0 "Intel 82371SB ISA" rev 0x00
pciide0 at pci0 dev 1 function 1 "Intel 82371SB IDE" rev 0x00: DMA,
channel 0 wired to compatibility, channel 1 wired to compatibility
pciide0: channel 0 disabled (no drives)
pciide0: channel 1 disabled (no drives)
uhci0 at pci0 dev 1 function 2 "Intel 82371SB USB" rev 0x01: apic 0 int 11
piixpm0 at pci0 dev 1 function 3 "Intel 82371AB Power" rev 0x03: apic 0
int 9
iic0 at piixpm0
vga1 at pci0 dev 2 function 0 "Red Hat QXL Video" rev 0x04
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
virtio0 at pci0 dev 3 function 0 "Qumranet Virtio Network" rev 0x00
vio0 at virtio0: 1 queue, address c4:37:72:f4:70:09
virtio0: msix shared
virtio1 at pci0 dev 4 function 0 "Qumranet Virtio SCSI" rev 0x00
vioscsi0 at virtio1: qsize 128
virtio1: msix per-VQ
scsibus1 at vioscsi0: 255 targets
cd0 at scsibus1 targ 0 lun 0: <QEMU, Virtuozzo CDROM1, 2.5+> removable
cd1 at scsibus1 targ 1 lun 0: <QEMU, Virtuozzo CDROM2, 2.5+> removable
ehci0 at pci0 dev 5 function 0 "Intel 82801DB USB" rev 0x10: apic 0 int 11
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 configuration 1 interface 0 "Intel EHCI root hub" rev
2.00/1.00 addr 1
virtio2 at pci0 dev 6 function 0 "Qumranet Virtio Console" rev 0x00
virtio2: no matching child driver; not configured
virtio3 at pci0 dev 7 function 0 "Qumranet Virtio Memory Balloon" rev 0x00
viomb0 at virtio3
virtio3: apic 0 int 11
virtio4 at pci0 dev 8 function 0 "Qumranet Virtio Storage" rev 0x00
vioblk0 at virtio4
virtio4: msix per-VQ
scsibus2 at vioblk0: 1 targets
sd0 at scsibus2 targ 0 lun 0: <VirtIO, Block Device, >
sd0: 614400MB, 512 bytes/sector, 1258291200 sectors
virtio5 at pci0 dev 10 function 0 vendor "Qumranet", unknown product
0x1012 rev 0x00
virtio5: no matching child driver; not configured
isa0 at pcib0
isadma0 at isa0
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pms0 at pckbc0 (aux slot)
wsmouse0 at pms0 mux 0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
usb1 at uhci0: USB revision 1.0
uhub1 at usb1 configuration 1 interface 0 "Intel UHCI root hub" rev
1.00/1.00 addr 1
enable mbufs in high memory
uhidev0 at uhub1 port 1 configuration 1 interface 0 "QEMU QEMU USB Tablet"
rev 2.00/0.00 addr 2
uhidev0: iclass 3/0
ums0 at uhidev0: 3 buttons, Z dir
wsmouse1 at ums0 mux 0
vscsi0 at root
scsibus3 at vscsi0: 256 targets
softraid0 at root
scsibus4 at softraid0: 256 targets
root on sd0a (336d4dd0b547058c.a) swap on sd0b dump on sd0b
fd0 at fdc0 drive 1: density unknown
