qemu invocation that yields a trap:
qemu-system-x86_64 -enable-kvm -machine q35 -cpu
host,-nodeid-msr,-vmx-msr-bitmap,-popcnt,-tsc-deadline,-mmxext,-fxsr-opt,-pdpe1gb,-rdtscp,-3dnow,-3dnowext,-cmp-legacy,-svm,-cr8legacy,-abm,-sse4a,-misalignsse,-3dnowprefetch,-osvw,-amd-no-ssb
\
-drive file=/path/to/raw.img,format=raw,if=virtio \
-m 512M \
-display curses
(note that `-cpu host` without deactivating any flag also yields a
trap)
dmesg output:
ddb> dmesg
OpenBSD 6.8 (GENERIC) #1: Tue Nov 3 09:04:47 MST 2020
r...@syspatch-68-amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC
real mem = 519954432 (495MB)
avail mem = 489299968 (466MB)
random: good seed from bootblocks
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.8 @ 0xf5aa0 (9 entries)
bios0: vendor SeaBIOS version
"?-20190711_202441-buildvm-armv7-10.arm.fedorapro
ject.org-2.fc31" date 04/01/2014
bios0: QEMU Standard PC (Q35 + ICH9, 2009)
acpi0 at bios0: ACPI 3.0
acpi0: sleep states S3 S4 S5
acpi0: tables DSDT FACP APIC HPET 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 Turion(tm) II Neo N40L Dual-Core Processor, 1497.89 MHz,
10-06-03
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,x2APIC,POPCNT,DEADLINE,HV,NXE,MMXX,FFXSR,PAGE1GB,
RDTSCP,LONG,3DNOW2,3DNOW,LAHF,CMPLEG,SVM,AMCR8,ABM,SSE4A,MASSE,3DNOWP,OSVW,
SSBDNR
cpu0: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 512KB
64b/line 1
6-way L2 cache, 16MB 64b/line 16-way L3 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 amd64_errata_setmsr+0x4e: wrmsr
Contents of CPU registers:
ddb> show registers
rdi 0x9c5a203a
rsi 0xffffffff820ff920 errata+0xe0
rbp 0xffffffff824c5740 end+0x2c5740
rbx 0x18
rdx 0
rcx 0xc0011029
rax 0x3
r8 0xffffffff824c55a8 end+0x2c55a8
r9 0
r10 0xbdf7dabff85d847b
r11 0x51e076fef1dcfa7b
r12 0
r13 0
r14 0xffffffff820ff940 acpihid_ca
r15 0xffffffff820ff920 errata+0xe0
rip 0xffffffff81bc6ede amd64_errata_setmsr+0x4e
cs 0x8
rflags 0x10256 __ALIGN_SIZE+0xf256
rsp 0xffffffff824c5730 end+0x2c5730
ss 0x10
amd64_errata_setmsr+0x4e: wrmsr
Working system dmesg (only change from invocation above is "-cpu
Opteron_G2-v1"):
OpenBSD 6.8 (GENERIC) #1: Tue Nov 3 09:04:47 MST 2020
r...@syspatch-68-amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC
real mem = 519950336 (495MB)
avail mem = 489304064 (466MB)
random: good seed from bootblocks
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.8 @ 0xf5aa0 (9 entries)
bios0: vendor SeaBIOS version
"?-20190711_202441-buildvm-armv7-10.arm.fedoraproject.org-2.fc31" date
04/01/2014
bios0: QEMU Standard PC (Q35 + ICH9, 2009)
acpi0 at bios0: ACPI 3.0
acpi0: sleep states S3 S4 S5
acpi0: tables DSDT FACP APIC HPET 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 Opteron 22xx (Gen 2 Class Opteron), 1497.89 MHz, 0f-06-01
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,x2APIC,HV,NXE,LONG,LAHF
cpu0: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 512KB
64b/line 16-way L2 cache, 16MB 64b/line 16-way L3 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: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges
cpu0: apic clock running at 999MHz
ioapic0 at mainbus0: apid 0 pa 0xfec00000, version 11, 24 pins
acpihpet0 at acpi0: 100000000 Hz
acpimcfg0 at acpi0
acpimcfg0: addr 0xb0000000, bus 0-255
acpiprt0 at acpi0: bus 0 (PCI0)
"ACPI0006" at acpi0 not configured
acpipci0 at acpi0 PCI0: 0x00000000 0x00000011 0x00000001
acpicmos0 at acpi0
"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!)
pvbus0 at mainbus0: KVM
pvclock0 at pvbus0
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel 82G33 Host" rev 0x00
vga1 at pci0 dev 1 function 0 "Bochs VGA" rev 0x02
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
virtio0 at pci0 dev 2 function 0 "Qumranet Virtio Network" rev 0x00
vio0 at virtio0: address 9a:00:00:00:00:00
virtio0: msix shared
xhci0 at pci0 dev 3 function 0 vendor "Red Hat", unknown product
0x000d rev 0x01: apic 0 int 23, xHCI 0.0
usb0 at xhci0: USB revision 3.0
uhub0 at usb0 configuration 1 interface 0 "Red Hat xHCI root hub" rev
3.00/1.00 addr 1
virtio1 at pci0 dev 4 function 0 "Qumranet Virtio Storage" rev 0x00
vioblk0 at virtio1
scsibus1 at vioblk0: 1 targets
sd0 at scsibus1 targ 0 lun 0: <VirtIO, Block Device, >
sd0: 51200MB, 512 bytes/sector, 104857600 sectors
virtio1: msix shared
pcib0 at pci0 dev 31 function 0 "Intel 82801IB LPC" rev 0x02
ahci0 at pci0 dev 31 function 2 "Intel 82801I AHCI" rev 0x02: msi, AHCI
1.0
ahci0: port 2: 1.5Gb/s
scsibus2 at ahci0: 32 targets
cd0 at scsibus2 targ 2 lun 0: <QEMU, QEMU DVD-ROM, 2.5+> removable
ichiic0 at pci0 dev 31 function 3 "Intel 82801I SMBus" rev 0x02: apic 0
int 16
iic0 at ichiic0
isa0 at pcib0
isadma0 at isa0
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
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
lpt0 at isa0 port 0x378/4 irq 7
axe0 at uhub0 port 5 configuration 1 interface 0 "ASIX Electronics
AX88772" rev 2.00/0.01 addr 2
axe0: AX88772, address 00:50:b6:0b:cf:f0
ukphy0 at axe0 phy 16: Generic IEEE 802.3u media interface, rev. 1:
OUI 0x000ec6, model 0x0006
vscsi0 at root
scsibus3 at vscsi0: 256 targets
softraid0 at root
scsibus4 at softraid0: 256 targets
root on sd0a (50fd7af99e5255c1.a) swap on sd0b dump on sd0b
I have been trying to disable features on qemu invocation, changing
the "-machine" parameter and unloading the Linux msr module, without
too much success. Folks in #qemu suggested the workaround I'm using
and advised that the problem may be a CPU feature that I ought to
disable, somehow.
I know about https://www.openbsd.org/lyrics.html#62 (No QEMU, only
DDB) :-) However, if anybody has bumped into this and can
successfully run OpenBSD as a guest on this type of hardware, I would
be grateful if they could throw me a few ideas for me to try out.
Thanks!
Gabriel
