Hello bugs@, I'm have problem with run OpenBSD current amd64 as guest in KVM hypervisor on Ubuntu server with AMD CPU.
Host OS: Ubuntu 12.04 TLS Host CPU: AMD Phenom(tm) II X4 975 Processor stepping 03 Host kernel: Linux M720-US3 3.2.0-43-generic #68-Ubuntu SMP Wed May 15 03:33:33 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux qemu-kvm: 1.2.0+dfsg-0~12.04~ppa0 seabios: 1.7.0-1 OpenBSD crash: acpiprt0 at acpi0: bus 0 (PCI0) mpbios0 at bios0: Intel MP Specification 1.4 cpu0 at mainbus0: apid 0 (boot processor) cpu0: AMD Phenom(tm) 9550 Quad-Core Processor, 3600.53 MHz cpu0: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CF LUSH,MMX,FXSR,SSE,SSE2,SSE3,CX16,POPCNT,NXE,MMXX,FFXSR,LONG,3DNOW2,3DNOW,LAHF,CM PLEG,SVM,AMCR8,ABM,SSE4A,MASSE,3DNOWP cpu0: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 512KB 64b/line 1 6-way L2 cache cpu0: ITLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped cpu0: DTLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped kernel: protection fault trap, code=0 Stopped at aesni_setup+0x1a0: rdmsr aesni_setup() at aesni setup+0x1a0 amd64_errata() at amd64 errata+0xc9 identifycpu() at identifycpu+0x729 cpu attach() at cpu_attach+0x2ce config_attach() at config_attach+0x1d4 mpbios_cpu() at mpbios_cpu+0x5b mpbios_scan() at mpbios_scan+0x355 config_attach() at config_attach+0x1d4 bios_attach() at bios_attach+0x296 config_attach() at config_attach+0x1d4 end trace frame: 0xffffffff81de9e30, count: 0 ddb{0}> ddb{0}> trace aesni_setup() at aesni_setup+0x1a0 amd64_errata() at amd64_errata+0xc9 identifycpu() at identifycpu+0x729 cpu_attach() at cpu_attach+0x2ce config_attach() at config_attach+0x1d4 mpbios_cpu() at mpbios_cpu+0x5b mpbios_scan() at mpbios_scan+0x355 config_attach() at config_attach+0x1d4 bios_attach() at bios_attach+0x296 config_attach() at config_attach+0x1d4 mainbus_attach() at mainbus_attach+0x5b config_attach() at config_attach+0x1d4 cpu_configure() at cpu_configure+0x17 main() at main+0x3f5 end trace frame: 0x0, count: -14 ddb{0}> ddb{0}>ps PID PPID PGRP UID S FLAGS WAIT COMMAND * 0 -1 0 0 7 0x200 swapper ddb{0}> After ported and applied patch from NetBSD ( http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/x86/x86/errata.c.diff?r1=1.20&r2=1.21&only_with_tag=MAIN&f=h ), OpenBSD run without crash: OpenBSD 5.3-current (GENERIC.MP) #0: Mon May 20 02:56:29 EEST 2013 root@buildbox.local:/usr/src/sys/arch/amd64/compile/GENERIC.MP real mem = 1056956416 (1007MB) avail mem = 1021165568 (973MB) mainbus0 at root bios0 at mainbus0: SMBIOS rev. 2.4 @ 0xfd970 (11 entries) bios0: vendor Bochs version "Bochs" date 01/01/2007 bios0: Bochs Bochs acpi0 at bios0: rev 0 acpi0: sleep states S3 S4 S5 acpi0: tables DSDT FACP SSDT APIC HPET SSDT acpi0: wakeup devices acpitimer0 at acpi0: 3579545 Hz, 24 bits acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat acpihpet0 at acpi0: 100000000 Hz acpiprt0 at acpi0: bus 0 (PCI0) mpbios0 at bios0: Intel MP Specification 1.4 cpu0 at mainbus0: apid 0 (boot processor) cpu0: AMD Phenom(tm) 9550 Quad-Core Processor, 3600.47 MHz cpu0: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,SSE3,CX16,POPCNT,RAZ,NXE,MMXX,FFXSR,LONG,3DNOW2,3DNOW,LAHF,CMPLEG,SVM,AMCR8,ABM,SSE4A,MASSE,3DNOWP cpu0: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 512KB 64b/line 16-way L2 cache cpu0: ITLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped cpu0: DTLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped cpu0: apic clock running at 999MHz cpu1 at mainbus0: apid 1 (application processor) cpu1: AMD Phenom(tm) 9550 Quad-Core Processor, 3600.30 MHz cpu1: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,SSE3,CX16,POPCNT,RAZ,NXE,MMXX,FFXSR,LONG,3DNOW2,3DNOW,LAHF,CMPLEG,SVM,AMCR8,ABM,SSE4A,MASSE,3DNOWP cpu1: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 512KB 64b/line 16-way L2 cache cpu1: ITLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped cpu1: DTLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped mpbios0: bus 0 is type PCI mpbios0: bus 1 is type ISA ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 11, 24 pins ioapic0: misconfigured as apic 0, remapped to apid 2 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) atapiscsi0 at pciide0 channel 1 drive 0 scsibus0 at atapiscsi0: 2 targets cd0 at scsibus0 targ 0 lun 0: <QEMU, QEMU DVD-ROM, 1.0> ATAPI 5/cdrom removable cd0(pciide0:1:0): using PIO mode 4, DMA mode 2 uhci0 at pci0 dev 1 function 2 "Intel 82371SB USB" rev 0x01: apic 2 int 11 piixpm0 at pci0 dev 1 function 3 "Intel 82371AB Power" rev 0x03: apic 2 int 9 iic0 at piixpm0 iic0: addr 0x4c 48=00 words 00=0000 01=0000 02=0000 03=0000 04=0000 05=0000 06=0000 07=0000 iic0: addr 0x4e 48=00 words 00=0000 01=0000 02=0000 03=0000 04=0000 05=0000 06=0000 07=0000 vga1 at pci0 dev 2 function 0 "Cirrus Logic CL-GD5446" rev 0x00 wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation) wsdisplay0: screen 1-5 added (80x25, vt100 emulation) em0 at pci0 dev 3 function 0 "Intel PRO/1000MT (82540EM)" rev 0x03: apic 2 int 11, address 52:54:00:73:d5:ed auich0 at pci0 dev 4 function 0 "Intel 82801AA AC97" rev 0x01: apic 2 int 11, ICH AC97 ac97: codec id 0x83847600 (SigmaTel STAC9700) audio0 at auich0 virtio0 at pci0 dev 5 function 0 "Qumranet Virtio Memory" rev 0x00: Virtio Memory Balloon Device viomb0 at virtio0 virtio0: apic 2 int 10 virtio1 at pci0 dev 6 function 0 "Qumranet Virtio Storage" rev 0x00: Virtio Block Device vioblk0 at virtio1 scsibus1 at vioblk0: 2 targets sd0 at scsibus1 targ 0 lun 0: <VirtIO, Block Device, > SCSI3 0/direct fixed sd0: 30000MB, 512 bytes/sector, 61440000 sectors virtio1: apic 2 int 10 isa0 at pcib0 isadma0 at isa0 com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo pckbc0 at isa0 port 0x60/5 pckbd0 at pckbc0 (kbd slot) pckbc0: using irq 1 for kbd slot wskbd0 at pckbd0: console keyboard, using wsdisplay0 pms0 at pckbc0 (aux slot #0) pckbc0: using irq 12 for aux slot #0 wsmouse0 at pms0 mux 0 pcppi0 at isa0 port 0x61 spkr0 at pcppi0 fdc0 at isa0 port 0x3f0/6 irq 6 drq 2 fd0 at fdc0 drive 0: density unknown fd1 at fdc0 drive 1: density unknown usb0 at uhci0: USB revision 1.0 uhub0 at usb0 "Intel UHCI root hub" rev 1.00/1.00 addr 1 nvram: invalid checksum mtrr: Pentium Pro MTRR support vscsi0 at root scsibus2 at vscsi0: 256 targets softraid0 at root scsibus3 at softraid0: 256 targets root on sd0a (4cac38236b543bbb.a) swap on sd0b dump on sd0b clock: unknown CMOS layout [demime 1.01d removed an attachment of type application/octet-stream which had a name of patch_amd64errata.diff]