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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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