[Qemu-devel] Pentium D with guest Ubuntu 6.06 server kernel panic with kqemu

["R. Armiento" <reply-2006@armiento.net>]

Hi,

Thanks to everyone involved in the qemu project, it is great software.

I have some issues with kqemu in kernel mode;

Host is running qemu-0.8.1 or qemu-cvs-2006-07-05_23, and 
kqemu-1.3.0pre9. Host OS is Ubuntu 6.06 server.

To reproduce: Start qemu as:
   qemu -kernel-kqemu -cdrom ubuntu-6.06-server-i386.iso -hda test.img 
-boot d
select 'Install to the hard disk'. Output is as follows:
------------------------------
Uncompressing Linux... Ok, booting the kernel
ACPI: Unable to locate RSDP
PCI: PIIX3: Enabling Passive Release on 0000:00:01.0
Invalid operand: 0000 [#1]
PREEMPT
Modules linked in:
CPU 0
EIP: 0060:[<c01011c6>] Not tainted VLI
EFLAGS: 00010246 (2.6.15-23-386)
EIP is at mwait_idle+0x16/0x30
[... register dump, etc ...]
<0>Kernel panic - not syncing: Attempted to kill the id
-----------------------------

Running qemu without '-kernel-kqemu' OR booting the guest install cd 
with kernel option 'idle=poll' or 'idle=halt' avoids the kernel panic.
(idle=halt is much faster than idle=poll, though).

The error looks very similar to the one reported here:
   http://www.mail-archive.com/qemu-devel@nongnu.org/msg03964.html
But I believe that reported issue should not appear in recent qemu, 
since SSE3 is now emulated (right?). (At least the patch in the end of 
that thread seems to already be included in the sources?)

So, my hypothesis is that there is some other feature that appears in my 
host CPUID, which the booting linux image tries to make use of, but 
which qemu does not emulate.

The host CPU is a dual-core Pentium D. Here is relevant lines from 
/proc/cpuinfo:
------------------------------
vendor_id       : GenuineIntel
cpu family      : 15
model           : 6
model name      : Intel(R) Pentium(R) D CPU 3.00GHz
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge 
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm 
pni monitor ds_cpl vmx est cid cx16 xtpr lahf_lm
-----------------------------

Any ideas?

Best regards,
Rickard
http://www.dewmill.com