kvm-bpf-tools
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Published
20 hours ago •
mmisono
mmisono
Some codes to trace KVM events using BPF
KVM BPF Tools
Some codes to trace KVM events using BPF. Currently only x86 is supported.
Requirements
VMEXIT Counts
Counts number of KVM VMEXIT. L2 shows the number of VMEXIT from nested guests.
% sudo ./kvm_vmexit_count.py
Tracing... Hit Ctrl-C to end.
^C
Exit reason Total L1 L2
0 EXCEPTION_OR_NMI 52 0 52
1 EXTERNAL_INT 68 49 19
7 INTERRUPT_WINDOW 91 84 7
12 HLT 2965 2787 178
15 RDPMC 8106 8106 0
19 VMCLEAR 118 118 0
20 VMLAUNCH 104 104 0
21 VMPTRLD 117 117 0
23 VMREAD 2887 2887 0
24 VMRESUME 2418 2418 0
28 MOV_CR 428 428 0
29 MOV_DR 579 579 0
30 IO_INSTRUCTION 134 46 88
31 RDMSR 1771 1761 10
32 WRMSR 1987 1294 693
44 APIC_ACCESS 7657 7657 0
48 EPT_VIOLATION 1528 5 152
49 EPT_MISCONFIG 76 76 0
50 INVEPT 25 25 0
52 VMX_PREEMPT_TIMER 51 32 19
53 INVVPID 17 17 0
Total 31179 28590 2589
VMEXIT Counts and Handling time
Counts number of KVM VMEXIT and measure average handling time. Reported time is in nano seconds.
$ sudo ./kvm_vmexit_time.py
Tracing... Hit Ctrl-C to end.
^C
Exit reason Total (Avg Time) L1 (Avg Time) L2 (Avg Time)
0 EXCEPTION_OR_NMI 27 ( 24760) 1 ( 4979) 26 ( 25520)
1 EXTERNAL_INT 25 ( 3304) 21 ( 2797) 4 ( 5967)
7 INTERRUPT_WINDOW 38 ( 4009) 37 ( 3363) 1 ( 27890)
12 HLT 1245 ( 3437190) 1164 ( 3674603) 81 ( 25469)
15 RDPMC 3760 ( 3785) 3760 ( 3785) 0 ( 0)
19 VMCLEAR 82 ( 12110) 82 ( 12110) 0 ( 0)
20 VMLAUNCH 69 ( 32072) 69 ( 32072) 0 ( 0)
21 VMPTRLD 82 ( 8692) 82 ( 8692) 0 ( 0)
23 VMREAD 1282 ( 3403) 1282 ( 3403) 0 ( 0)
24 VMRESUME 1031 ( 28250) 1031 ( 28250) 0 ( 0)
28 MOV_CR 324 ( 6583) 324 ( 6583) 0 ( 0)
29 MOV_DR 308 ( 2597) 308 ( 2597) 0 ( 0)
30 IO_INSTRUCTION 68 ( 21263) 19 ( 14930) 49 ( 23719)
31 RDMSR 897 ( 2858) 892 ( 2744) 5 ( 23206)
32 WRMSR 1060 ( 9160) 777 ( 3059) 283 ( 25912)
44 APIC_ACCESS 3414 ( 8813) 3414 ( 8813) 0 ( 0)
48 EPT_VIOLATION 666 ( 27375) 1 ( 15456) 665 ( 27393)
49 EPT_MISCONFIG 22 ( 21835) 22 ( 21835) 0 ( 0)
50 INVEPT 6 ( 6420) 6 ( 6420) 0 ( 0)
52 VMX_PREEMPT_TIMER 21 ( 12105) 14 ( 4543) 7 ( 27228)
53 INVVPID 2 ( 6608) 2 ( 6608) 0 ( 0)
Total (Avg Time) 14430 ( 304754) 13309 ( 328184) 1121 ( 26580)
VMEXIT Handling time histogram
Show VMEXIT handling time histogram. Reported time is in nano seconds.
% sudo ./kvm_vmexit_time_hist.py
Tracing... Hit Ctrl-C to end.
^C
value : count distribution
0 -> 1 : 0 | |
2 -> 3 : 0 | |
4 -> 7 : 0 | |
8 -> 15 : 0 | |
16 -> 31 : 0 | |
32 -> 63 : 0 | |
64 -> 127 : 0 | |
128 -> 255 : 0 | |
256 -> 511 : 55 | |
512 -> 1023 : 772 |*** |
1024 -> 2047 : 2497 |********** |
2048 -> 4095 : 9349 |****************************************|
4096 -> 8191 : 3823 |**************** |
8192 -> 16383 : 2762 |*********** |
16384 -> 32767 : 2912 |************ |
32768 -> 65535 : 129 | |
65536 -> 131071 : 16 | |
131072 -> 262143 : 47 | |
262144 -> 524287 : 56 | |
524288 -> 1048575 : 228 | |
1048576 -> 2097151 : 183 | |
2097152 -> 4194303 : 1115 |**** |
4194304 -> 8388607 : 290 |* |
8388608 -> 16777215 : 201 | |
Only trace the specified VMEXIT by the specifying VMEXIT number.
% sudo ./kvm_vmexit_time_hist.py 12
Tracing... Hit Ctrl-C to end.
^C
value : count distribution
0 -> 1 : 0 | |
2 -> 3 : 0 | |
4 -> 7 : 0 | |
8 -> 15 : 0 | |
16 -> 31 : 0 | |
32 -> 63 : 0 | |
64 -> 127 : 0 | |
128 -> 255 : 0 | |
256 -> 511 : 5 | |
512 -> 1023 : 498 |****************************************|
1024 -> 2047 : 489 |*************************************** |
2048 -> 4095 : 457 |************************************ |
4096 -> 8191 : 318 |************************* |
8192 -> 16383 : 301 |************************ |
16384 -> 32767 : 137 |*********** |
32768 -> 65535 : 9 | |
65536 -> 131071 : 2 | |
131072 -> 262143 : 1 | |
262144 -> 524287 : 2 | |
524288 -> 1048575 : 18 |* |
1048576 -> 2097151 : 25 |** |
2097152 -> 4194303 : 99 |******* |
4194304 -> 8388607 : 29 |** |
8388608 -> 16777215 : 13 |* |
VMEXIT Handling time slower
Report VMEXIT events whose handling time is longer than the predefined value. Reported time is in nano seconds.
# Threshold is 1ms (default: 10ms) and excludes exit 12 (HLT)
% sudo ./kvm_vmexit_slower.py 1 --excludes 12,
Excludes: HLT
Tracing... Hit Ctrl-C to end.
44 APIC_ACCESS 2631024 (L1)
44 APIC_ACCESS 1442657 (L1)
1 EXTERNAL_INT 1635030 (L1)
...
License
Apache-2.0
mmisono