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SubjectRe: [PATCH v4 05/10] KVM/x86: expose MSR_IA32_PERF_CAPABILITIES to the guest
> The issue is compatibility. Prior to your change, reading this MSR
> from a VM would raise #GP. After your change, it won't. That means
> that if you have a VM migrating between hosts with kernel versions
> before and after this change, the results will be inconsistent. In the

No it will not be. All Linux kernel uses of this MSR are guarded
by a CPUID check.

-Andi

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