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    Subject[PATCH v4 08/10] KVM: MMU: trace fast page fault
    To see what happen on this path and help us to optimize it

    Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
    ---
    arch/x86/kvm/mmu.c | 2 ++
    arch/x86/kvm/mmutrace.h | 41 +++++++++++++++++++++++++++++++++++++++++
    2 files changed, 43 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
    index 15f01a3..f8d8375 100644
    --- a/arch/x86/kvm/mmu.c
    +++ b/arch/x86/kvm/mmu.c
    @@ -2831,6 +2831,8 @@ static bool fast_page_fault(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn,
    spte, gfn);

    exit:
    + trace_fast_page_fault(vcpu, gva, gfn, error_code, iterator.sptep,
    + spte, ret);
    walk_shadow_page_lockless_end(vcpu);

    return ret;
    diff --git a/arch/x86/kvm/mmutrace.h b/arch/x86/kvm/mmutrace.h
    index 89fb0e8..84da94f 100644
    --- a/arch/x86/kvm/mmutrace.h
    +++ b/arch/x86/kvm/mmutrace.h
    @@ -243,6 +243,47 @@ TRACE_EVENT(
    TP_printk("addr:%llx gfn %llx access %x", __entry->addr, __entry->gfn,
    __entry->access)
    );
    +
    +#define __spte_satisfied(__spte) \
    + (__entry->retry && is_writable_pte(__entry->__spte))
    +
    +TRACE_EVENT(
    + fast_page_fault,
    + TP_PROTO(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn, u32 error_code,
    + u64 *sptep, u64 old_spte, bool retry),
    + TP_ARGS(vcpu, gva, gfn, error_code, sptep, old_spte, retry),
    +
    + TP_STRUCT__entry(
    + __field(int, vcpu_id)
    + __field(gva_t, gva)
    + __field(gfn_t, gfn)
    + __field(u32, error_code)
    + __field(u64 *, sptep)
    + __field(u64, old_spte)
    + __field(u64, new_spte)
    + __field(bool, retry)
    + ),
    +
    + TP_fast_assign(
    + __entry->vcpu_id = vcpu->vcpu_id;
    + __entry->gva = gva;
    + __entry->gfn = gfn;
    + __entry->error_code = error_code;
    + __entry->sptep = sptep;
    + __entry->old_spte = old_spte;
    + __entry->new_spte = *sptep;
    + __entry->retry = retry;
    + ),
    +
    + TP_printk("vcpu %d gva %lx gfn %llx error_code %s sptep %p "
    + "old %#llx new %llx spurious %d fixed %d", __entry->vcpu_id,
    + __entry->gva, __entry->gfn,
    + __print_flags(__entry->error_code, "|",
    + kvm_mmu_trace_pferr_flags),
    + __entry->sptep, __entry->old_spte, __entry->new_spte,
    + __spte_satisfied(old_spte), __spte_satisfied(new_spte)
    + )
    +);
    #endif /* _TRACE_KVMMMU_H */

    #undef TRACE_INCLUDE_PATH
    --
    1.7.7.6


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