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Commit 089504c0 authored by Xiao Guangrong's avatar Xiao Guangrong Committed by Gleb Natapov
Browse files

KVM: MMU: add tracepoint for check_mmio_spte 



It is useful for debug mmio spte invalidation

Signed-off-by: default avatarXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Reviewed-by: default avatarGleb Natapov <gleb@redhat.com>
Reviewed-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent f8f55942

arch/x86/kvm/mmu.c

+7 −2
Original line number Diff line number Diff line
@@ -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)

{

	return likely(get_mmio_spte_generation(spte) ==

			kvm_current_mmio_generation(kvm));

	unsigned int kvm_gen, spte_gen;



	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)

arch/x86/kvm/mmutrace.h

+24 −0
Original line number Diff line number Diff line
@@ -298,6 +298,30 @@ TRACE_EVENT( 
		  __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 */



#undef TRACE_INCLUDE_PATH