Internal Subsystem Information

Details about QEMU’s various subsystems including how to add features to them.

• The QEMU Object Model (QOM)
  • The QOM tree
  • Creating a QOM class
  • Standard type declaration and definition macros
  • Device Life-cycle
  • API Reference
• Atomic operations in QEMU
  • Compiler memory barrier
  • Sequentially consistent atomic access
  • Weak atomic access and manual memory barriers
  • Comparison with Linux kernel primitives
  • Sources
• block-coroutine-wrapper
  • Usage
  • Links
• Modelling a clock tree in QEMU
  • What are clocks?
  • The clock state
  • Adding a new clock
  • Clock callbacks
  • Retrieving clocks from a device
  • Connecting two clocks together
  • Clock multiplier and divider settings
  • Unconnected input clocks
  • Fetching clock frequency/period
  • Calculating expiry deadlines
  • Obtaining tick counts
  • Changing a clock period
  • Aliasing clocks
  • Migration
• eBPF RSS virtio-net support
  • RSS eBPF program
  • eBPF RSS implementation
• Migration
  • Migration framework
  • Migration features
  • Backwards compatibility
  • Best practices
• Multi-process QEMU
  • QEMU services
  • Separating IO services
  • New separation model based on proxy objects
  • Disaggregated CPU emulation
  • Host access controls
• Reset in QEMU: the Resettable interface
  • Triggering reset
  • Multi-phase mechanism
  • Handling reset in a resettable object
  • Base class handling of reset
  • Reset of the complete system
• QAPI interface for S390 CPU topology
  • Additions to query-cpus-fast
  • QAPI command: set-cpu-topology
  • QAPI event CPU_POLARIZATION_CHANGE
  • QAPI query command: query-s390x-cpu-polarization
• Booting from real channel-attached devices on s390x
  • s390 hardware IPL
  • How this all pertains to QEMU (and the kernel)
  • What QEMU does
• Tracing
  • Introduction
  • Quickstart
  • Trace events
  • Generic interface and monitor commands
  • Trace backends
  • Trace event properties
• IOMMUFD BACKEND usage with VFIO
  • Example configuration
  • Supported platform
  • Caveats
• How to write monitor commands
  • Overview
  • Testing
  • Writing a simple command: hello-world
  • Writing more complex commands
  • Writing a debugging aid returning unstructured text
• Writing VirtIO backends for QEMU
  • VirtIO Transports
  • Using the QEMU Object Model (QOM)
  • Back End Implementations