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Debugging
Yin Fengwei
Yin, Fengwei<fengwei.yin@intel.com>
04/22/2020
Agenda
- Overview
- ACRN Hypervisor
- SOS (Linux)
- UOS
- Misc tool
Overview
ACRN
SOS (Linux) UOS
DM APP
HV log
ACRN
trace
UOS logger
UOS profiling tool
SOS logger
(journald/syslogd)
gdb
DM logger
Kernel log/trace
Most debug capabilities available ONLY with DEBUG build
ACRN Hypervisor
• Hvlog for function debug
- Serial port
* legacy IO port UART
* PCI UART (needs BIOS initialize UART controller)
- NPK (Hardware dependency. Not available for all platforms)
- log buffer. Exported to SOS. The logs before hvlog setup are lost.
• ACRN trace for profiling
- trace buffer. Exported to SOS
- acrntrace toolset
SOS (Linux)
• General kernel log (kmesg) and kernel trace
• User space logger (journald)
- capture the systemd service logger
- constrain: SOS storage capacity. Default journald configuration
- Journald telemetry
• DM logger
- --logger_setting of dm cmdline
- disk logger: save log to disk
- console logger: output log to console
- kmsg logger: output log to SOS kmesg
• Gdb
- very powerful tool to debug DM as a process of SOS
- all BKMs for gdb applied
SOS (Clear Linux) - gdb case study
• Check UOS kmesg
- Attach gdb to dm and stop dm and check ctx base address.
- locate UOS kmesg address:
#find ctx->base_addr, +0x200000000, {char[30]}"Supporting XSAVE feature 0x001"
- dump 1M memory range of UOS kmesg buffer
#dump binary memory ~/dump.bin <return_find> <return_find + 1M>
- parse content dumped with attached python script
• Check the ioreq handled in DM
- attach gdb to dm with attached vmexit.txt as init script
- gdb will print the ioreq info
- Very useful when we want to check whether guest is still alive
UOS (Linux/Xenomai)
• Depends on UOS
Misc tools
• Platform tracing tool
- align the trace from HV(acrntrace), SOS(ftrace) and UOS(UOS trace)
- easy to check the system behavior with aligned timestamp cross HV/SOS/UOS
- very useful to locate system performance bottleneck
https://github.com/conghuic23/acrn_trace
• JTAG tool – powerful lowlevel debugging tool
• Top/htop – CPU usage monitor
• Valgrind – memory leak detection
Q & A

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Project ACRN system debug

  • 2. Agenda - Overview - ACRN Hypervisor - SOS (Linux) - UOS - Misc tool
  • 3. Overview ACRN SOS (Linux) UOS DM APP HV log ACRN trace UOS logger UOS profiling tool SOS logger (journald/syslogd) gdb DM logger Kernel log/trace Most debug capabilities available ONLY with DEBUG build
  • 4. ACRN Hypervisor • Hvlog for function debug - Serial port * legacy IO port UART * PCI UART (needs BIOS initialize UART controller) - NPK (Hardware dependency. Not available for all platforms) - log buffer. Exported to SOS. The logs before hvlog setup are lost. • ACRN trace for profiling - trace buffer. Exported to SOS - acrntrace toolset
  • 5. SOS (Linux) • General kernel log (kmesg) and kernel trace • User space logger (journald) - capture the systemd service logger - constrain: SOS storage capacity. Default journald configuration - Journald telemetry • DM logger - --logger_setting of dm cmdline - disk logger: save log to disk - console logger: output log to console - kmsg logger: output log to SOS kmesg • Gdb - very powerful tool to debug DM as a process of SOS - all BKMs for gdb applied
  • 6. SOS (Clear Linux) - gdb case study • Check UOS kmesg - Attach gdb to dm and stop dm and check ctx base address. - locate UOS kmesg address: #find ctx->base_addr, +0x200000000, {char[30]}"Supporting XSAVE feature 0x001" - dump 1M memory range of UOS kmesg buffer #dump binary memory ~/dump.bin <return_find> <return_find + 1M> - parse content dumped with attached python script • Check the ioreq handled in DM - attach gdb to dm with attached vmexit.txt as init script - gdb will print the ioreq info - Very useful when we want to check whether guest is still alive
  • 8. Misc tools • Platform tracing tool - align the trace from HV(acrntrace), SOS(ftrace) and UOS(UOS trace) - easy to check the system behavior with aligned timestamp cross HV/SOS/UOS - very useful to locate system performance bottleneck https://github.com/conghuic23/acrn_trace • JTAG tool – powerful lowlevel debugging tool • Top/htop – CPU usage monitor • Valgrind – memory leak detection