forked from Minki/linux
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> Signed-off-by: Avi Kivity <avi@redhat.com>
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@ -2776,6 +2776,8 @@ static bool fast_page_fault(struct kvm_vcpu *vcpu, gva_t gva, int level,
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*/
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ret = fast_pf_fix_direct_spte(vcpu, iterator.sptep, spte);
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exit:
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trace_fast_page_fault(vcpu, gva, error_code, iterator.sptep,
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spte, ret);
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walk_shadow_page_lockless_end(vcpu);
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return ret;
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@ -243,6 +243,44 @@ TRACE_EVENT(
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TP_printk("addr:%llx gfn %llx access %x", __entry->addr, __entry->gfn,
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__entry->access)
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);
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#define __spte_satisfied(__spte) \
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(__entry->retry && is_writable_pte(__entry->__spte))
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TRACE_EVENT(
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fast_page_fault,
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TP_PROTO(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code,
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u64 *sptep, u64 old_spte, bool retry),
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TP_ARGS(vcpu, gva, error_code, sptep, old_spte, retry),
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TP_STRUCT__entry(
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__field(int, vcpu_id)
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__field(gva_t, gva)
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__field(u32, error_code)
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__field(u64 *, sptep)
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__field(u64, old_spte)
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__field(u64, new_spte)
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__field(bool, retry)
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),
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TP_fast_assign(
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__entry->vcpu_id = vcpu->vcpu_id;
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__entry->gva = gva;
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__entry->error_code = error_code;
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__entry->sptep = sptep;
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__entry->old_spte = old_spte;
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__entry->new_spte = *sptep;
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__entry->retry = retry;
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),
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TP_printk("vcpu %d gva %lx error_code %s sptep %p old %#llx"
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" new %llx spurious %d fixed %d", __entry->vcpu_id,
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__entry->gva, __print_flags(__entry->error_code, "|",
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kvm_mmu_trace_pferr_flags), __entry->sptep,
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__entry->old_spte, __entry->new_spte,
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__spte_satisfied(old_spte), __spte_satisfied(new_spte)
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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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