• Wei Huang's avatar
    KVM: arm64: Fix the issues when guest PMCCFILTR is configured · b112c84a
    Wei Huang authored
    KVM calls kvm_pmu_set_counter_event_type() when PMCCFILTR is configured.
    But this function can't deals with PMCCFILTR correctly because the evtCount
    bits of PMCCFILTR, which is reserved 0, conflits with the SW_INCR event
    type of other PMXEVTYPER<n> registers. To fix it, when eventsel == 0, this
    function shouldn't return immediately; instead it needs to check further
    if select_idx is ARMV8_PMU_CYCLE_IDX.
    
    Another issue is that KVM shouldn't copy the eventsel bits of PMCCFILTER
    blindly to attr.config. Instead it ought to convert the request to the
    "cpu cycle" event type (i.e. 0x11).
    
    To support this patch and to prevent duplicated definitions, a limited
    set of ARMv8 perf event types were relocated from perf_event.c to
    asm/perf_event.h.
    
    Cc: stable@vger.kernel.org # 4.6+
    Acked-by: default avatarWill Deacon <will.deacon@arm.com>
    Signed-off-by: default avatarWei Huang <wei@redhat.com>
    Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
    b112c84a
pmu.c 13.5 KB