kvm: Add a tracepoint write_tsc_offset
Add a tracepoint write_tsc_offset for tracing TSC offset change. We want to merge ftrace's trace data of guest OSs and the host OS using TSC for timestamp in chronological order. We need "TSC offset" values for each guest when merge those because the TSC value on a guest is always the host TSC plus guest's TSC offset. If we get the TSC offset values, we can calculate the host TSC value for each guest events from the TSC offset and the event TSC value. The host TSC values of the guest events are used when we want to merge trace data of guests and the host in chronological order. (Note: the trace_clock of both the host and the guest must be set x86-tsc in this case) This tracepoint also records vcpu_id which can be used to merge trace data for SMP guests. A merge tool will read TSC offset for each vcpu, then the tool converts guest TSC values to host TSC values for each vcpu. TSC offset is stored in the VMCS by vmx_write_tsc_offset() or vmx_adjust_tsc_offset(). KVM executes the former function when a guest boots. The latter function is executed when kvm clock is updated. Only host can read TSC offset value from VMCS, so a host needs to output TSC offset value when TSC offset is changed. Since the TSC offset is not often changed, it could be overwritten by other frequent events while tracing. To avoid that, I recommend to use a special instance for getting this event: 1. set a instance before booting a guest # cd /sys/kernel/debug/tracing/instances # mkdir tsc_offset # cd tsc_offset # echo x86-tsc > trace_clock # echo 1 > events/kvm/kvm_write_tsc_offset/enable 2. boot a guest Signed-off-by: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com> Cc: Joerg Roedel <joro@8bytes.org> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Gleb Natapov <gleb@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Acked-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Gleb Natapov <gleb@redhat.com>
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@ -1026,7 +1026,10 @@ static void svm_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
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g_tsc_offset = svm->vmcb->control.tsc_offset -
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svm->nested.hsave->control.tsc_offset;
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svm->nested.hsave->control.tsc_offset = offset;
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}
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} else
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trace_kvm_write_tsc_offset(vcpu->vcpu_id,
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svm->vmcb->control.tsc_offset,
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offset);
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svm->vmcb->control.tsc_offset = offset + g_tsc_offset;
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@ -1044,6 +1047,11 @@ static void svm_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment, bool ho
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svm->vmcb->control.tsc_offset += adjustment;
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if (is_guest_mode(vcpu))
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svm->nested.hsave->control.tsc_offset += adjustment;
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else
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trace_kvm_write_tsc_offset(vcpu->vcpu_id,
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svm->vmcb->control.tsc_offset - adjustment,
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svm->vmcb->control.tsc_offset);
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mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
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}
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@ -756,6 +756,27 @@ TRACE_EVENT(
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__entry->gpa_match ? "GPA" : "GVA")
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);
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TRACE_EVENT(kvm_write_tsc_offset,
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TP_PROTO(unsigned int vcpu_id, __u64 previous_tsc_offset,
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__u64 next_tsc_offset),
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TP_ARGS(vcpu_id, previous_tsc_offset, next_tsc_offset),
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TP_STRUCT__entry(
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__field( unsigned int, vcpu_id )
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__field( __u64, previous_tsc_offset )
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__field( __u64, next_tsc_offset )
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),
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TP_fast_assign(
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__entry->vcpu_id = vcpu_id;
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__entry->previous_tsc_offset = previous_tsc_offset;
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__entry->next_tsc_offset = next_tsc_offset;
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),
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TP_printk("vcpu=%u prev=%llu next=%llu", __entry->vcpu_id,
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__entry->previous_tsc_offset, __entry->next_tsc_offset)
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);
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#ifdef CONFIG_X86_64
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#define host_clocks \
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@ -2096,6 +2096,8 @@ static void vmx_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
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(nested_cpu_has(vmcs12, CPU_BASED_USE_TSC_OFFSETING) ?
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vmcs12->tsc_offset : 0));
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} else {
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trace_kvm_write_tsc_offset(vcpu->vcpu_id,
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vmcs_read64(TSC_OFFSET), offset);
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vmcs_write64(TSC_OFFSET, offset);
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}
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}
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@ -2103,11 +2105,14 @@ static void vmx_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
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static void vmx_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment, bool host)
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{
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u64 offset = vmcs_read64(TSC_OFFSET);
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vmcs_write64(TSC_OFFSET, offset + adjustment);
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if (is_guest_mode(vcpu)) {
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/* Even when running L2, the adjustment needs to apply to L1 */
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to_vmx(vcpu)->nested.vmcs01_tsc_offset += adjustment;
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}
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} else
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trace_kvm_write_tsc_offset(vcpu->vcpu_id, offset,
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offset + adjustment);
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}
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static u64 vmx_compute_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc)
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@ -7303,3 +7303,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit);
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EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga);
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EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit);
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EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts);
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EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_write_tsc_offset);
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