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 > > 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/ kvm cmdline: qemu-system-x86_64 -net nic -net tap,ifname=tap0,script=no slack64.img > > Regards, > Andre. > >> >> bash-3.1$ /home/dave/tmp/qemu-system-x86_64 --version >> QEMU emulator version 0.12.50 (qemu-kvm-devel), Copyright (c) >> 2003-2008 Fabrice Bellard >> >> >> bash-3.1$ uname -a >> Linux darkstar 2.6.35-rc1 #35 SMP Mon May 31 16:50:15 CST 2010 x86_64 >> Intel(R) Core(TM)2 Duo CPU E7500 @ 2.93GHz GenuineIntel GNU/Linux >> >> host distribution is slackware64-13.0 >> >> 0.12.3 works well >> >> BTW the guest is a tiny core linux image >> > > -- > Andre Przywara > AMD-Operating System Research Center (OSRC), Dresden, Germany > Tel: +49 351 448-3567-12 > > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- Regards dave -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
