Jan Kiszka wrote:
If you have dozens of lapics, you don't want to check them all if they are ALL switched of anyway. That information is better encoded in a single, (virtual) system-wide bool. That's the most common case we want to speed up. And it is the core of the optimization Avi suggested (unless I totally misunderstood him).
Yes, that's what I meant. Touching vcpu data is expensive since it's likely to be in MESI (or whatever it's called now) exclusive mode on some other cpu.
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