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

[Erik Rull <erik.rull@rdsoftware.de>]

Erik Rull wrote:
> 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
>

Hi all,

further results:
- kvm32,+nx brings Windows 8 back and boots successfully

not clear:
- Why has the core2duo definition changed from 1.2.0 to the current git 
master version?
- Why does core2duo,+nx not work?

Best regards,

Erik