On Fri, Jul 27, 2018 at 2:30 PM, Jim Mattson jmattson@google.com wrote:
On Fri, Jul 27, 2018 at 2:05 PM, Andy Lutomirski luto@kernel.org wrote:
Does KVM *have* a concept of "maximum non-turbo frequency" of the guest that it would make sense to expose here? If so, presumably the right solution is to expose it.
KVM has the concept of a guest's invariant TSC frequency. The Maximum Non-Turbo Ratio is just some fraction of that. Sadly, the fraction is 100 MHz, 133.33MHz, or the "scalable bus frequency" from some other MSR, depending on microarchitecture.
Which is problematic, unless KVM wants to start deciding what the base clock is. There's MSR_FSB_FREQ, which is supported on Atom only, IIRC.
I really wish Intel would get its act together. -- To unsubscribe from this list: send the line "unsubscribe linux-kselftest" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html