Hi,

and here's a dmesg of OpenBSD running as SEV-SNP guest on KVM/qemu.
Nothing special to see, except the cpu0 guest mode line:

OpenBSD 8.0-beta (GENERIC.MP) #1: Wed Jul 29 15:42:04 CEST 2026
    hshoexer@vm02:/data/git/hshoexer/openbsd/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 8561545216 (8164MB)
avail mem = 8279441408 (7895MB)
random: good seed from bootblocks
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.8 @ 0x7f53e000 (10 entries)
bios0:
bios0: QEMU Standard PC (Q35 + ICH9, 2009)
efi0 at bios0: UEFI 2.7
efi0: EDK II rev 0x10000
acpi0 at bios0: ACPI 3.0
acpi0: sleep states S5
acpi0: tables DSDT FACP APIC TPM2 MCFG WAET
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-Genoa Processor, 3000.88 MHz, 19-11-00
cpu0: cpuid 1 edx=78bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2> ecx=f6fa3203<SSE3,PCLMUL,SSSE3,FMA3,CX16,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,AES,XSAVE,AVX,F16C,RDRAND,HV>
cpu0: cpuid 6 eax=4<ARAT>
cpu0: cpuid 7.0 ebx=f1bf07a9<FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,AVX512F,AVX512DQ,RDSEED,ADX,SMAP,AVX512IFMA,CLFLUSHOPT,CLWB,AVX512CD,SHA,AVX512BW,AVX512VL> ecx=415f4e<AVX512VBMI,UMIP,PKU> edx=10
cpu0: cpuid d.1 eax=d<XSAVEOPT,XGETBV1,XSAVES>
cpu0: cpuid 80000001 edx=2fd3fbff<NXE,MMXX,FFXSR,PAGE1GB,RDTSCP,LONG> ecx=c003f5<LAHF,SVM,AMCR8,ABM,SSE4A,MASSE,3DNOWP,OSVW,TOPEXT,CPCTR>
cpu0: cpuid 80000008 ebx=1102d205<IBPB,IBRS,STIBP,STIBP_ALL,SSBD>
cpu0: cpuid 8000001F eax=1a<SEV,SEVES,SEVSNP>
cpu0: SEV-SNP guest mode
cpu0: 32KB 64b/line 8-way D-cache, 32KB 64b/line 8-way I-cache, 1MB 64b/line 8-way L2 cache, 32MB 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
ioapic0 at mainbus0: apid 0 pa 0xfec00000, version 11, 24 pins
acpimcfg0 at acpi0
acpimcfg0: addr 0xe0000000, bus 0-255
acpiprt0 at acpi0: bus 0 (PCI0)
"ACPI0006" at acpi0 not configured
acpipci0 at acpi0 PCI0: 0x00000010 0x00000011 0x00000000
"PNP0A06" at acpi0 not configured
"PNP0A06" at acpi0 not configured
"PNP0A06" at acpi0 not configured
"QEMU0002" at acpi0 not configured
com0 at acpi0 COM1 addr 0x3f8/0x8 irq 4: ns16550a, 16 byte fifo
com0: console
"PNP0303" at acpi0 not configured
"PNP0F13" at acpi0 not configured
acpicmos0 at acpi0
"ACPI0010" at acpi0 not configured
"MSFT0101" at acpi0 not configured
acpicpu0 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 82G33 Host" rev 0x00
ppb0 at pci0 dev 1 function 0 "Red Hat PCIE" rev 0x00: apic 0 int 21
pci1 at ppb0 bus 1
virtio0 at pci1 dev 0 function 0 "Qumranet Virtio 1.x Network" rev 0x01
vio0 at virtio0: 1 queue, address 00:16:3e:aa:00:17
virtio0: msix per-VQ
ppb1 at pci0 dev 1 function 1 "Red Hat PCIE" rev 0x00: apic 0 int 21
pci2 at ppb1 bus 2
virtio1 at pci2 dev 0 function 0 "Qumranet Virtio 1.x Storage" rev 0x01
vioblk0 at virtio1
virtio1: msix per-VQ
scsibus1 at vioblk0: 1 targets
sd0 at scsibus1 targ 0 lun 0: <VirtIO, Block Device, >
sd0: 20480MB, 512 bytes/sector, 41943040 sectors
ppb2 at pci0 dev 1 function 2 "Red Hat PCIE" rev 0x00: apic 0 int 21
pci3 at ppb2 bus 3
virtio2 at pci3 dev 0 function 0 "Qumranet Virtio 1.x Console" rev 0x01
virtio2: no matching child driver; not configured
ppb3 at pci0 dev 1 function 3 "Red Hat PCIE" rev 0x00: apic 0 int 21
pci4 at ppb3 bus 4
"Red Hat xHCI" rev 0x01 at pci4 dev 0 function 0 not configured
ppb4 at pci0 dev 1 function 4 "Red Hat PCIE" rev 0x00: apic 0 int 21
pci5 at ppb4 bus 5
virtio3 at pci5 dev 0 function 0 "Qumranet Virtio 1.x Memory Balloon" rev 0x01
virtio3: no matching child driver; not configured
ppb5 at pci0 dev 1 function 5 "Red Hat PCIE" rev 0x00: apic 0 int 21
pci6 at ppb5 bus 6
virtio4 at pci6 dev 0 function 0 "Qumranet Virtio 1.x RNG" rev 0x01
viornd0 at virtio4
virtio4: msix per-VQ
ppb6 at pci0 dev 1 function 6 "Red Hat PCIE" rev 0x00: apic 0 int 21
pci7 at ppb6 bus 7
virtio5 at pci7 dev 0 function 0 "Qumranet Virtio 1.x SCSI" rev 0x01
vioscsi0 at virtio5: qsize 256
virtio5: msix per-VQ
scsibus2 at vioscsi0: 255 targets
ppb7 at pci0 dev 1 function 7 "Red Hat PCIE" rev 0x00: apic 0 int 21
pci8 at ppb7 bus 8
virtio6 at pci8 dev 0 function 0 "Qumranet Virtio 1.x Storage" rev 0x01
vioblk1 at virtio6
virtio6: msix per-VQ
scsibus3 at vioblk1: 1 targets
sd1 at scsibus3 targ 0 lun 0: <VirtIO, Block Device, >
sd1: 20480MB, 512 bytes/sector, 41943040 sectors
ppb8 at pci0 dev 2 function 0 "Red Hat PCIE" rev 0x00: apic 0 int 22
pci9 at ppb8 bus 9
ppb9 at pci0 dev 2 function 1 "Red Hat PCIE" rev 0x00: apic 0 int 22
pci10 at ppb9 bus 10
ppb10 at pci0 dev 2 function 2 "Red Hat PCIE" rev 0x00: apic 0 int 22
pci11 at ppb10 bus 11
ppb11 at pci0 dev 2 function 3 "Red Hat PCIE" rev 0x00: apic 0 int 22
pci12 at ppb11 bus 12
ppb12 at pci0 dev 2 function 4 "Red Hat PCIE" rev 0x00: apic 0 int 22
pci13 at ppb12 bus 13
ppb13 at pci0 dev 2 function 5 "Red Hat PCIE" rev 0x00: apic 0 int 22
pci14 at ppb13 bus 14
"Intel 82801IB LPC" rev 0x02 at pci0 dev 31 function 0 not configured
"Intel 82801I AHCI" rev 0x02 at pci0 dev 31 function 2 not configured
"Intel 82801I SMBus" rev 0x02 at pci0 dev 31 function 3 not configured
isa0 at mainbus0
vmm at mainbus0 not configured
efifb at mainbus0 not configured
enable mbufs in high memory
vscsi0 at root
scsibus4 at vscsi0: 256 targets
softraid0 at root
scsibus5 at softraid0: 256 targets
root on sd0a (40df13f96cf934e5.a) swap on sd0b dump on sd0b