Sean, On Saturday 12 June 2010, sean darcy wrote: > With Fedora 13, 2.6.33.5-112, vbox gives this message: > > vboxdrv: Warning: 2.6.31+ kernel detected. Most likely the hardware > performance > vboxdrv: counter framework which can generate NMIs is active. You have > to prevent > vboxdrv: the usage of hardware performance counters by > vboxdrv: echo 2 > /proc/sys/kernel/perf_counter_paranoid > > But: > > ls /proc/sys/kernel/perf* > /proc/sys/kernel/perf_event_max_sample_rate > /proc/sys/kernel/perf_event_paranoid > /proc/sys/kernel/perf_event_mlock_kb > > Is perf_counter_paranoid now perf_event_paranoid?
yes, you are right. Although this is a hack anyway. This hack should prevent using the perf counter framework while a VirtualBox VM is executed. The reason is that the perf counter code in newer Linux kernels is able to generate an NMI (non-maskable interrupt) which could (if it occurs at the wrong time) reboot the host. A proper solution is still pending, the above hack should forbid at least non-root users to use the perf counters. Kind regards, Frank -- Dr.-Ing. Frank Mehnert Sitz der Gesellschaft: Sun Microsystems GmbH, Sonnenallee 1, 85551 Kirchheim-Heimstetten Amtsgericht München: HRB 161028 Geschäftsführer: Jürgen Kunz
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