• Paolo Bonzini's avatar
    pmu: prepare for migration support · afd80d85
    Paolo Bonzini authored
    In order to migrate the PMU state correctly, we need to restore the
    values of MSR_CORE_PERF_GLOBAL_STATUS (a read-only register) and
    MSR_CORE_PERF_GLOBAL_OVF_CTRL (which has side effects when written).
    We also need to write the full 40-bit value of the performance counter,
    which would only be possible with a v3 architectural PMU's full-width
    counter MSRs.
    To distinguish host-initiated writes from the guest's, pass the
    full struct msr_data to kvm_pmu_set_msr.
    Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
    Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>