What does the field irq indicate in the kvm_inj_virq event?

Asked Dec 04 '22 at 12:56

Active Dec 04 '22 at 14:02

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I have generated trace on an intel machine through trace-cmd(ftrace) while running virtual machines through KVM/QEMU hypervisor. In the kvm_inj_virq event, the irq field is a number indicating the kind of interrupt that's getting inserted. But I need to know the exact meaning of this number like whether it's a network, timer, disk or any other kind of interrupt.

I have attached an image of the trace for reference. Sample Trace

I tried searching for the IRQ numbers and their corresponding meaning. I found the first 16 mappings here, but I need to know the rest of them.

edited Dec 04 '22 at 14:02

asked Dec 04 '22 at 12:56

TNT Captain

Does it match the number in /proc/interrupts? – stark Dec 04 '22 at 14:18
_"First 16 mappings"_ are legacy which may not be the case on newest hardware. – 0andriy Dec 04 '22 at 18:57
Btw, there is no such function or data type or variable named `kvm_inj_virq` in the (vanilla) Linux kernel. – 0andriy Dec 04 '22 at 18:59
1

@0andriy You're right. I just checked that there's no code for kvm_inj_virq, but then why is there such a tracepoint available to trace in ftrace? – TNT Captain Dec 05 '22 at 09:50

What does the field irq indicate in the kvm_inj_virq event?

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