diff options
| author | Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> | 2013-06-07 16:51:27 +0800 |
|---|---|---|
| committer | Gleb Natapov <gleb@redhat.com> | 2013-06-27 14:20:37 +0300 |
| commit | 089504c0d40a24fe37a108c0eda16a9e7b846f12 (patch) | |
| tree | 26f08d707df244465b993a8af7ae6471ea152fa5 | |
| parent | f8f559422b6c6a05469dfde614b67789b6142cb5 (diff) | |
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>
| -rw-r--r-- | arch/x86/kvm/mmu.c | 9 | ||||
| -rw-r--r-- | arch/x86/kvm/mmutrace.h | 24 |
2 files changed, 31 insertions, 2 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 3e893cd90389..417f36b7c0e4 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -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) diff --git a/arch/x86/kvm/mmutrace.h b/arch/x86/kvm/mmutrace.h index ad24757041ad..9d2e0ffcb190 100644 --- a/arch/x86/kvm/mmutrace.h +++ b/arch/x86/kvm/mmutrace.h @@ -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 |