Virtualizing a FreeBSD image on Xen

SUSE Linux Enterprise Server SLES Virtualization
1

Running SLES11sp2 (64bit) with Xen 3.0.13-0.27.

I received a (VmPlayer) guest.vmdk file which I converted to a .img format with the following command : qemu-img convert guest.vmdk -O raw guest.img.

Within Xen I create a new VM as Ubuntu (as FreeBSD is not listed). I set up the memory, disk, NIC etc and then start the VM. The VM starts to boot and then after a few seconds I get the following error:

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address = 0x0
fault code = supervisor read instruction, page not present
instruction pointer = 0x8:0x0
stack pointer = 0x10:0xffffffff80e5ec10
frame pointer = 0x10:0xffffffff80e5ec80
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current processors = 0 (swapper)
[thread pid 0 tid 100000]
stopped at 0: *** error reading from address ***
db >

This same application runs perfectly on a Windows VmPlayer version 5.02

Any help in getting this VM within the SuSE Xen to work will be much appreciated.

Regards
John

2

Hi John,

have you set up the DomU as an HVM? If it’s a PVM, then you’d need to prepare your image with a different kernel supporting the Xen interfaces.

Regards,
Jens

3

Hi,

I set up the VM in Full Virtulization.
Below is file from /etc/xen/vm/
name=“be1”
description=""
uuid=“c986595a-c073-494f-100d-1ba0469db3d5”
memory=4096
maxmem=4096
vcpus=1
on_poweroff=“destroy”
on_reboot=“restart”
on_crash=“destroy”
localtime=0
keymap=“en-us”

builder=“hvm”
device_model="/usr/lib/xen/bin/qemu-dm"
kernel="/usr/lib/xen/boot/hvmloader"
boot=“c”
disk=[ ‘file:/var/lib/xen/images/be1/be1.img,hda,w’, ]
vif=[ ‘mac=00:16:3e:21:d6:40,bridge=br1,model=rtl8139’, ]

stdvga=0
vnc=1
vncunused=1

viridian=0
apic=0
acpi=1
pae=1

serial=“pty”

and from xm list -l be1 > be1
(domain
(cpu_weight 256)
(cpu_cap 0)
(pool_name Pool-0)
(bootloader ‘’)
(vcpus 1)
(cpus (()))
(on_poweroff destroy)
(description)
(on_crash destroy)
(uuid c986595a-c073-494f-100d-1ba0469db3d5)
(bootloader_args ‘’)
(name be1)
(on_reboot restart)
(maxmem 4096)
(memory 4096)
(shadow_memory 33)
(features ‘’)
(on_xend_start ignore)
(on_xend_stop ignore)
(start_time 1365598325.2)
(cpu_time 16.067247612)
(online_vcpus 1)
(image
(hvm
(kernel ‘’)
(superpages 0)
(videoram 4)
(hpet 0)
(stdvga 0)
(loader /usr/lib/xen/boot/hvmloader)
(xen_platform_pci 1)
(rtc_timeoffset 0)
(pci ())
(hap 1)
(localtime 0)
(xenpaging_extra ())
(actmem 0)
(pci_msitranslate 1)
(oos 1)
(apic 0)
(xenpaging_file ‘’)
(timer_mode 1)
(vpt_align 1)
(serial pty)
(vncunused 1)
(boot c)
(pae 1)
(viridian 0)
(acpi 1)
(vnc 1)
(nographic 0)
(watchdog_action reset)
(nomigrate 0)
(usb 0)
(tsc_mode 0)
(guest_os_type default)
(device_model /usr/lib/xen/bin/qemu-dm)
(keymap en-us)
(pci_power_mgmt 0)
(xauthority /root/.Xauthority)
(isa 0)
(notes (SUSPEND_CANCEL 1))
)
)
(status 0)
(store_mfn 1044476)
(device
(vif
(bridge br0)
(mac 00:16:3e:21:d6:40)
(devid 0)
(model rtl8139)
(uuid 0ea77a16-db28-c69b-b99b-ebbfd5291aff)
)
)
(device
(console
(protocol vt100)
(uuid bb2b7e88-44b8-a47c-c0e4-f0b621524646)
(location 3)
)
)
(device
(vbd
(uuid 47f1915c-9b04-8cbb-9f2c-3c2b422708af)
(bootable 1)
(devid 768)
(driver paravirtualised)
(dev hda)
(uname file:/var/lib/xen/images/be1/be1.img)
(mode w)
)
)
(device
(vfb
(vncunused 1)
(vnc 1)
(uuid b39a193f-df01-6acc-5a18-406b1938cb61)
(devid 0)
(keymap en-us)
(location 127.0.0.1:5900)
)
)
)

I hope this helps
Regards
John

4

Hi John,

have you seen this message? http://lists.freebsd.org/pipermail/freebsd-bugs/2012-January/047016.html

I don’t know how old your system is, maybe you’re hitting that (or a similar) bug?

Regards,
Jens

5

Thanks Jens,

I have refered the developers to your link.

Many thanks
John