Messages in this thread | | | Subject | Re: kvm: RDTSCP on AMD | From | Paolo Bonzini <> | Date | Wed, 6 Jul 2016 23:27:16 +0200 |
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On 06/07/2016 19:34, Eduardo Habkost wrote: >> > Nothing is needed in the kernel actually. You can skip the intercept >> > by running the guest with MSR_TSC_AUX set to the guest's expected value. >> > Which KVM does, except that it's botched so I need to apply the >> > patch in https://lkml.org/lkml/2016/4/13/802. > Do you mean -cpu Opteron_G*,+rdtscp will be buggy on Linux v4.5? > (v4.5 reports rdtscp as supported in GET_SUPPORTED_CPUID) > > Can we do something to make QEMU detect the buggy kernel before > allowing rdtscp to be enabled, or should we just tell people to > upgrade their kernel?
We usually just tell people to use the latest stable kernel.
Adding new CPU models is not a big deal, in fact it's almost easier than getting compat properties right. :)
Paolo
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