I have no idea what is causing your backend timeout, but your VM
config would be useful information, and take a look at xend.log etc.
on the host for any related errors (if you have access to it). I'm
running OpenBSD 6.4 just fine under Xen; however my Dom0 is only 4.4.4
(dmesg attached).
Note that in your 6.0 dmesg, you have "wd0 at pciide0" vs. my "sd0 at
scsibus1" via "scsibus1 at xbf0"; the man page for xbf(4) indicates it
was added in 6.1, and that it takes over all virtual disks. As a
workaround, you might try boot -c and disable xbf, which would
presumably present your disk via the emulated IDE controller.
-Andrew
OpenBSD 6.4 (GENERIC.MP) #364: Thu Oct 11 13:30:23 MDT 2018
dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 1056964608 (1008MB)
avail mem = 1015713792 (968MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.4 @ 0xeb01f (12 entries)
bios0: vendor Xen version "4.4.4_34-61.32.1" date 08/17/2018
bios0: Xen HVM domU
acpi0 at bios0: rev 2
acpi0: sleep states S5
acpi0: tables DSDT FACP APIC WAET SSDT SSDT
acpi0: wakeup devices
acpitimer0 at acpi0: 3579545 Hz, 32 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
ioapic0 at mainbus0: apid 1 pa 0xfec00000, version 11, 48 pins, remapped
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Xeon(R) CPU E5450 @ 3.00GHz, 2993.06 MHz, 06-17-06
cpu0:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,HTT,SSE3,SSSE3,CX16,SSE4.1,x2APIC,DEADLINE,HV,NXE,LONG,LAHF,MELTDOWN
cpu0: 6MB 64b/line 16-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges
cpu0: apic clock running at 100MHz
cpu1 at mainbus0: apid 2 (application processor)
cpu1: Intel(R) Xeon(R) CPU E5450 @ 3.00GHz, 2992.68 MHz, 06-17-06
cpu1:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,HTT,SSE3,SSSE3,CX16,SSE4.1,x2APIC,DEADLINE,HV,NXE,LONG,LAHF,MELTDOWN
cpu1: 6MB 64b/line 16-way L2 cache
cpu1: smt 0, core 2, package 0
acpiprt0 at acpi0: bus 0 (PCI0)
acpicpu0 at acpi0: C1(@1 halt!)
acpicpu1 at acpi0: C1(@1 halt!)
acpicmos0 at acpi0
"ACPI0007" at acpi0 not configured
"ACPI0007" at acpi0 not configured
pvbus0 at mainbus0: Xen 4.4
xen0 at pvbus0: features 0x705, 32 grant table frames, event channel 4
"vfb" at xen0: device/vfb/0 not configured
xbf0 at xen0 backend 0 channel 6: disk
scsibus1 at xbf0: 2 targets
sd0 at scsibus1 targ 0 lun 0: <Xen, phy hda 768, 0000> SCSI3 0/direct fixed
sd0: 4096MB, 512 bytes/sector, 8388608 sectors
xnf0 at xen0 backend 0 channel 7: address 00:16:3e:79:85:28
xnf1 at xen0 backend 0 channel 8: address 00:16:3e:46:21:98
"console" at xen0: device/console/0 not configured
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)
piixpm0 at pci0 dev 1 function 3 "Intel 82371AB Power" rev 0x01: SMBus disabled
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)
xspd0 at pci0 dev 3 function 0 "XenSource Platform Device" rev 0x01
isa0 at pcib0
isadma0 at isa0
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
com0: console
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
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
root on sd0a (70bae60fe9b7d0df.a) swap on sd0b dump on sd0b
fd0 at fdc0 drive 0: density unknown
fd1 at fdc0 drive 1: density unknown
