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KVM: MMU: add tracepoint for check_mmio_spte

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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>
This commit is contained in:
Xiao Guangrong 2013-06-07 16:51:27 +08:00 • committed by Gleb Natapov
parent f8f559422b
commit 089504c0d4
2 changed files with 31 additions and 2 deletions
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9
arch/x86/kvm/mmu.c
View file

@ -283,8 +283,13 @@ static bool set_mmio_spte(struct kvm *kvm, u64 *sptep, gfn_t gfn,
static bool check_mmio_spte(struct kvm *kvm, u64 spte) static bool check_mmio_spte(struct kvm *kvm, u64 spte)
{ {
return likely(get_mmio_spte_generation(spte) == unsigned int kvm_gen, spte_gen;
kvm_current_mmio_generation(kvm));
kvm_gen = kvm_current_mmio_generation(kvm);
spte_gen = get_mmio_spte_generation(spte);
trace_check_mmio_spte(spte, kvm_gen, spte_gen);
return likely(kvm_gen == spte_gen);
} }
static inline u64 rsvd_bits(int s, int e) static inline u64 rsvd_bits(int s, int e)

24
arch/x86/kvm/mmutrace.h
View file

@ -298,6 +298,30 @@ TRACE_EVENT(
__entry->mmu_valid_gen, __entry->mmu_used_pages __entry->mmu_valid_gen, __entry->mmu_used_pages
) )
); );
TRACE_EVENT(
check_mmio_spte,
TP_PROTO(u64 spte, unsigned int kvm_gen, unsigned int spte_gen),
TP_ARGS(spte, kvm_gen, spte_gen),
TP_STRUCT__entry(
__field(unsigned int, kvm_gen)
__field(unsigned int, spte_gen)
__field(u64, spte)
),
TP_fast_assign(
__entry->kvm_gen = kvm_gen;
__entry->spte_gen = spte_gen;
__entry->spte = spte;
),
TP_printk("spte %llx kvm_gen %x spte-gen %x valid %d", __entry->spte,
__entry->kvm_gen, __entry->spte_gen,
__entry->kvm_gen == __entry->spte_gen
)
);
#endif /* _TRACE_KVMMMU_H */ #endif /* _TRACE_KVMMMU_H */
#undef TRACE_INCLUDE_PATH #undef TRACE_INCLUDE_PATH