On 08/16/2012 07:25 PM, Avi Kivity wrote: > On 08/16/2012 02:17 PM, Peter Zijlstra wrote: >> On Thu, 2012-08-16 at 14:06 +0300, Avi Kivity wrote: >> >>> Another option is to deal with them on the host side. That has the >>> benefit of working with non-Linux guests too. >> >> Right, its an insane amount of MSRs though, but it could be done if >> someone takes the time to enumerate them all. > > It's tedious but that's life. > >> >> If KVM then simply ignores all writes and returns all 0 on read we can >> do the same we do for the regular PMU in check_hw_exists(). >> >>> We can just ignore the MSR and print some warning. >> >> If you don't mind printing a warning every time a Linux guest boots ;-) > > We can printk_once() it, or only under debug, now that we have dynamic > debug. We also need to print the warning only if the counter is > enabled. Will Linux configure uncore counters by default (why and which?) >
The uncore driver may write some global control MSRs during initialization. I did it because of its simpleness. Peter, do I need to submit a patch disables uncore on virtualized CPU? Regards Yan, Zheng -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
