Re: Failed to create domU HVM Linux guest with Xen 3.3

[Roger Pau Monné <roger.pau%entel.upc.edu@localhost>]

Hello,

I've asked the same question on the Xen-users lists, here is the topic:

http://permalink.gmane.org/gmane.comp.emulators.xen.user/67825?set_blog_all=yes

Just in case someone faces the same problem.

2011/6/22 Manuel Bouyer <bouyer%antioche.eu.org@localhost>:
> On Wed, Jun 15, 2011 at 04:28:06PM +0200, Roger Pau Monné wrote:
>> Hello,
>>
>> Im' trying to create a Linux HVM guest in Xen 3.3 using raw files as
>> disks, but there seems to be some problem with the devices and the
>> machine crashes, the config fle I'm using:
>> (ubuntu.img created with 'dd if=/dev/zero of=ubuntu.img bs=1m count=4096')
>>
>> kernel = '/usr/pkg/lib/xen/boot/hvmloader'
>> builder = 'hvm'
>> memory = '2048'
>> device_model='/usr/pkg/libexec/qemu-dm'
>>
>> disk = [ 'file:/home/xen/ubuntu.img,ioemu:hda,w',
>>           'file:/home/xen/ubuntu.iso,ioemu:hdb:cdrom,r', ]
>>
>> # Hostname
>> name = "ubntu11"
>>
>> vif = [ 'type=ioemu, bridge=bridge1' ]
>>
>> boot= 'd'
>> vnc = 1
>> usbdevice = 'tablet' # Helps with mouse pointer positioning
>>
>> The output from qemu is the following:
>>
>> domid: 13
>> qemu: the number of cpus is 1
>> Watching /local/domain/0/device-model/13/logdirty/next-active
>> Watching /local/domain/0/device-model/13/command
>> qemu_map_cache_init nr_buckets = 10000 size 3145728
>> shared page at pfn 7fffe
>> buffered io page at pfn 7fffc
>> Time offset set 0
>> Register xen platform.
>> Done register platform.
>> I/O request not ready: 0, ptr: 0, port: 0, data: 0, count: 0, size: 0
>>
>> And xm dmesg output the following:
>>
>> (XEN) realmode.c:133:d13 Failed to emulate insn.
>> (XEN) realmode.c:175:d13 Real-mode emulation failed @ 0020:0000a82b:
>> 0f 00 d0 b0 28 8e
>> (XEN) domain_crash called from realmode.c:176
>> (XEN) Domain 13 (vcpu#0) crashed on cpu#23:
>> (XEN) ----[ Xen-3.3.2  x86_64  debug=n  Not tainted ]----
>> (XEN) CPU:    23
>> (XEN) RIP:    0028:[<000000000000a82b>]
>
> I guess this kernel uses instructions not understood by the Xen 3.3
> x86 emulator. If this is a kernel you built yourself, try less
> aggressive gcc flags.
> The RIP looks like an instruction before the MMU is on, so this may be
> in some assembly file.
>
> Maybe try Xen 4.1 ?
>
> --
> Manuel Bouyer <bouyer%antioche.eu.org@localhost>
>     NetBSD: 26 ans d'experience feront toujours la difference
> --
>