[Qemu-devel] Changed host CPU from Core2Duo to Core i3 or i5 => Windows 8 reboots infinitely

[Erik Rull]

Hi all,

I have the following qemu commandline on an i3 or i5 CPU (both behave the same),
Windows XP (Standard PC installation) runs fine, Windows 7 and Windows 8 reboot
in an infinite loop either shortly before the logo is displayed (Windows 7) or
after the boot logo is displayed (Windows 8).
On a core2duo T7700 - with exactly the same command line (ComExpress Module was
just exchanged) everythin runs great.

My command line is:
/disc/qemu/qemu-system-x86_64 -daemonize -cpu core2duo -nodefaults -vga cirrus 
 -readconfig /usr/X11R6/X11etc/ich9-ehci-uhci.cfg -device
usb-host,bus=ehci.0,hostbus=3 -device usb-host,bus=ehci.0,hostbus=5 -device
usb-host,bus=ehci.0,hostbus=6  -device usb-tablet -drive file=/dev/sdb,cache=off
-m 1536 -net nic,vlan=0,model=virtio,macaddr=AC:DE:48:10:4D:67 -net
tap,vlan=0,script=/usr/X11R6/X11etc/qemu-ifup  -monitor
telnet:127.0.0.1:5100,nowait,server -vnc :1 -L /disc/qemu -boot c -localtime
-enable-kvm -no-shutdown

qemu compiled from git, the ich-chipset config file is from qemu/docs.
I also tried -cpu host, to exclude some side effects to the core2duo
cpu-settings, no effect.
The same effects are seen on qemu-1.2.0, too!

Any hints or suggestions to narrow down the cloud of possible error sources are
appreciated.

Thanks.

Best regards,

Erik