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#!/usr/bin/python
#
# kvm_hypercall.py
#
# Demonstrates stateful kvm_entry and kvm_exit recording along with the
# associated hypercall when exit_reason is VMCALL. See kvm_hypercall.txt
# for usage
#
# REQUIRES: Linux 4.7+ (BPF_PROG_TYPE_TRACEPOINT support)
#
# Copyright (c) 2017 ShiftLeft Inc.
#
# Author(s):
# Suchakrapani Sharma <suchakra@shiftleft.io>
from __future__ import print_function
from bcc import BPF
# load BPF program
b = BPF(text="""
#define EXIT_REASON 18
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 : %d\\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 : %u\\n", args->vcpu_id);
start.update(&e, &zero);
}
return 0;
}
TRACEPOINT_PROBE(kvm, kvm_hypercall) {
u8 e = EXIT_REASON;
u8 zero = 0;
u8 *s = start.lookup(&e);
if (s != NULL && *s == 1) {
bpf_trace_printk("HYPERCALL nr : %d\\n", args->nr);
}
return 0;
};
""")
# header
print("%-18s %-16s %-6s %s" % ("TIME(s)", "COMM", "PID", "EVENT"))
# format output
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))
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