On 04/17/2012 07:15 PM, Jan Kiszka wrote: > On 2012-04-17 14:06, Avi Kivity wrote: > > On 04/17/2012 03:03 PM, Gleb Natapov wrote: > >>> > >>> KVM_MAX_VCPUS. > >>> > >> Ah, so you are worried about malicious guest configuring pit to > >> broadcast to all its vcpus. > > > > Yes - it can introduce huge amounts of latency this way which is exactly > > what Jan is trying to prevent. > > > > Though I'm not sure spin_lock_irq() in the realtime tree actually > > disables irqs (but it's certainly not a good idea in mainline; it's > > nasty even with just the spinlock). > > This depends on how you declare the spin lock type - raw or normal. The > former will disable irqs, the latter not even preemption (but become a > mutex). Yes (and I see no reason to use raw spinlocks here). Still, for mainline, are we okay with 254*IPIs? Maybe it's not so bad and I'm overinflating the problem. -- error compiling committee.c: too many arguments to function -- 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
