# host: fedora7, guest: win2k3 stand.

# cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Core(TM)2 CPU          6320  @ 1.86GHz
stepping        : 6
cpu MHz         : 1600.000
cache size      : 4096 KB
...

# uname -a
Linux ringvm.pepperocini.org 2.6.22.9-91.fc7 #1 SMP Thu Sep 27 20:47:39 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux

# qemu-img create -f qcow2 a.img 10G
Formatting 'a.img', fmt=qcow2, size=10485760 kB

# /usr/local/bin/qemu-system-x86_64 -hda a.img -cdrom /root/aio.iso -smp 1 -boot  d -m 1024
exception 14 (9)
rax 0000000000000000 rbx 0000000000000000 rcx 00000000f6df1500 rdx 0000000000000002
rsi 00000000e10b4828 rdi 00000000f6df1500 rsp 00000000f78ce000 rbp 00000000f78ce01c
r8  0000000000000000 r9  0000000000000000 r10 0000000000000000 r11 0000000000000000
r12 0000000000000000 r13 0000000000000000 r14 0000000000000000 r15 0000000000000000
rip 0000000080602dc0 rflags 00010282
cs 0008 (00000000/ffffffff p 1 dpl 0 db 1 s 1 type b l 0 g 1 avl 0)
ds 0023 (00000000/ffffffff p 1 dpl 3 db 1 s 1 type 3 l 0 g 1 avl 0)
es 0023 (00000000/ffffffff p 1 dpl 3 db 1 s 1 type 3 l 0 g 1 avl 0)
ss 0010 (00000000/ffffffff p 1 dpl 0 db 1 s 1 type 3 l 0 g 1 avl 0)
fs 0030 (ffdff000/00001fff p 1 dpl 0 db 1 s 1 type 3 l 0 g 1 avl 0)
gs 0000 (00000000/ffffffff p 0 dpl 0 db 0 s 0 type 0 l 0 g 0 avl 0)
tr 0028 (80042000/000020ab p 1 dpl 0 db 0 s 0 type b l 0 g 0 avl 0)
ldt 0000 (00000000/ffffffff p 0 dpl 0 db 0 s 0 type 0 l 0 g 0 avl 0)
gdt 8003f000/3ff
idt 8003f400/7ff
cr0 e001003b cr2 c1780000 cr3 70c0000 cr4 698 cr8 3 efer 0
Abgebrochen

# qemu-img create -f qcow2 a.img 10G
Formatting 'a.img', fmt=qcow2, size=10485760 kB

# /usr/local/bin/qemu-system-x86_64 -hda a.img -cdrom /root/aio.iso -smp 1 -boot d -m 1024 -no-kvm-irqchip

(guest hangs when formating at 20%, 100% host-cpu time)