[kvm-devel] Bug: cpu0 unhandled rdmsr: 0x1900 and inject_general_protection

[TJ <li...@tj...>]

Trying to run the latest OLPC XO guest image with kvm-intel on 2.6.22
x86_64 (Ubuntu Gutsy) on a T7200 there are critical problems which don't
occur if kvm-intel is not loaded/used.

The same issue affects kvm-48, kvm-50 and kvm-51.

I don't see these problems with Gutsy or Windows guests. The issues are:

1. Start-up of the image into GRUB is _slow_. The cursor can be seen
scanning as the GRUB menu is drawn. It is *much* faster when kvm-intel
isn't loaded/used.

2. After choosing a boot option the guest freezes and the host kern.log
reports:

kernel: [88380.014893] kvm: 12666: cpu0 unhandled rdmsr: 0x1900
kernel: [88380.014900] inject_general_protection: rip 0xc07211ab

3. Guest locks up at this point with host CPU being driven 100% and requires killing.


I'm guessing they may be related to the OLPC kernel expecting an AMD Geode CPU?

./include/asm-i386/msr.h
#define MSR_GEODE_BUSCONT_CONF0 0x1900

The OLPC disk image and configuration instructions are here:

http://wiki.laptop.org/go/Emulating_the_XO/Quick_Start

The configuration used here is:

vdeq kvm -m 256 -hda olpc-redhat-stream-development-devel_ext3.ovl -soundhw es1370 -net nic,model=rtl8139,macaddr=56:44:45:30:32:31,vlan=0 -net vde,vlan=0

Is this a known issue - I couldn't find anything similar in searches of the mailing-list or bug-tracker ?

Thanks.

TJ.