Messages in this thread | | | From | Jim Mattson <> | Date | Fri, 27 Jul 2018 14:30:24 -0700 | Subject | Re: [PATCH v14 8/9] KVM: x86: virtualize cpuid faulting |
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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.
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