KVM: MMU: add tracepoint for check_mmio_spte
It is useful for debug mmio spte invalidation Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Reviewed-by: Gleb Natapov <gleb@redhat.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -283,8 +283,13 @@ static bool set_mmio_spte(struct kvm *kvm, u64 *sptep, gfn_t gfn,
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static bool check_mmio_spte(struct kvm *kvm, u64 spte)
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{
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return likely(get_mmio_spte_generation(spte) ==
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kvm_current_mmio_generation(kvm));
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unsigned int kvm_gen, spte_gen;
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kvm_gen = kvm_current_mmio_generation(kvm);
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spte_gen = get_mmio_spte_generation(spte);
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trace_check_mmio_spte(spte, kvm_gen, spte_gen);
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return likely(kvm_gen == spte_gen);
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}
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static inline u64 rsvd_bits(int s, int e)
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@ -298,6 +298,30 @@ TRACE_EVENT(
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__entry->mmu_valid_gen, __entry->mmu_used_pages
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)
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);
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TRACE_EVENT(
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check_mmio_spte,
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TP_PROTO(u64 spte, unsigned int kvm_gen, unsigned int spte_gen),
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TP_ARGS(spte, kvm_gen, spte_gen),
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TP_STRUCT__entry(
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__field(unsigned int, kvm_gen)
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__field(unsigned int, spte_gen)
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__field(u64, spte)
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),
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TP_fast_assign(
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__entry->kvm_gen = kvm_gen;
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__entry->spte_gen = spte_gen;
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__entry->spte = spte;
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),
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TP_printk("spte %llx kvm_gen %x spte-gen %x valid %d", __entry->spte,
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__entry->kvm_gen, __entry->spte_gen,
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__entry->kvm_gen == __entry->spte_gen
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)
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);
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#endif /* _TRACE_KVMMMU_H */
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#undef TRACE_INCLUDE_PATH
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