kvm_cpuid.py

#!/usr/bin/env python
from __future__ import print_function
from bcc import BPF

b = BPF(text="""
#define EXIT_REASON 10
BPF_HASH(start, u8, u8);


TRACEPOINT_PROBE(kvm, kvm_exit) {
    u8 e = EXIT_REASON;
    u8 one = 1;
    if (args->exit_reason == EXIT_REASON) {
        bpf_trace_printk("KVM_EXIT exit_reason : 0x%x\\n", args->exit_reason);
        start.update(&e, &one);
    }
    return 0;
}


TRACEPOINT_PROBE(kvm, kvm_entry) {
    u8 e = EXIT_REASON;
    u8 zero = 0;
    u8 *s = start.lookup(&e);
    if (s != NULL && *s == 1) {
        bpf_trace_printk("KVM_ENTRY vcpu_id : 0x%x\\n", args->vcpu_id);
        start.update(&e, &zero);
    }
    return 0;
}


TRACEPOINT_PROBE(kvm, kvm_cpuid) {
    u8 e = EXIT_REASON;
    u8 zero = 0;
    u8 *s = start.lookup(&e);
    if(s != NULL && *s == 1){
        bpf_trace_printk("KVM_CPUID rax : 0x%x, rbx : 0x%x, rcx : 0x%x\\n",args->rax,args->rbx,args->rcx);
    }
    return 0;
};
""")

print("%-18s %-16s %-6s %s" % ("TIME(s)", "COMM", "PID", "EVENT"))

while 1:
    try:
        (task, pid, cpu, flags, ts, msg) = b.trace_fields()
    except ValueError:
        continue
    print("%-18.9f %-16s %-6d %s" % (ts, task, pid, msg))