Dave Young wrote:
On Wed, Jun 2, 2010 at 8:45 PM, Andre Przywara <andre.przywara@xxxxxxx> wrote:
Dave Young wrote:
Hi,
With today's git version (qemu-kvm), I got following message in kernel
dmesg
[168344.215605] kvm: 27289: cpu0 unhandled wrmsr: 0x198 data 0
Are you sure about that?
Sure
0x198 is an Intel architectural perfmon MSR and it
is read-only. The Linux kernel source I grep'ed obeys this and does only
rdmsr.
You can work around this by changing the error to a warning with:
# modprobe kvm ignore_msrs=1
with this param, appear following warning:
kvm: 28520: cpu0 ignored wrmsr: 0x198 data 0
As suspected. Did the boot succeed, then?
I'd like to see more details about the guest Linux kernel, at least the
version you used to see why there is a wrmsr on this address. Best is you
provide the kernel (just the vmlinuz file) somewhere so that we can
reproduce this. Also the qemu-kvm command line would be interesting.
Actually I tried different guest image, recreate this problem is easy.
one of them is slackware 13.0 kernel version 2.6.29.6, you can download from:
http://www.slackware.at/data/slackware64-13.0/kernels/huge.s/
Ah, nice to meet the other Slackware user ;-)
kvm cmdline:
qemu-system-x86_64 -net nic -net tap,ifname=tap0,script=no slack64.img
I tried:
$ x86_64-softmmu/qemu-system-x86_64 -kernel /boot/vmlinuz-huge-2.6.29.6
-nographic -append "console=ttyS0,115200n8" -cpu
core2duo,model=26,stepping=5,vendor=GenuineIntel
This booted fine.
Sadly I had no access to an Intel box this morning, so I had to use
vendor override, but I guess this misses some features which an original
Intel box has.
Can you post the /proc/cpuinfo output from the guest? It seems that some
feature bits trigger the behavior in the guest. The host was an
Xeon5520, right?
Regards,
Andre.
--
Andre Przywara
AMD-Operating System Research Center (OSRC), Dresden, Germany
Tel: +49 351 448-3567-12
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