This patch set follows a previous patch which added the qemu_plugin_read_memory_vaddr function and adds a set of similar functions to read and write registers, virtual memory, and physical memory.
The use case I have in mind is for use of QEMU for program analysis and testing. For example, a fuzzer which uses QEMU for emulation might wish to inject test data into a program at runtime using qemu_plugin_write_memory_vaddr (and likewise if testing an operating system or bare metal application using qemu_plugin_write_memory_hwaddr). It may also wish to read the initial contents of memory using qemu_plugin_read_memory_vaddr/hwaddr. Similarly, a testing framework may wish to fake register values, perhaps to simulate a device failure, perhaps by using qemu_plugin_write_register to set a register value to an error code. I think all this functionality works together to make QEMU plugins more powerful and versatile, hopefully removing barriers to using upstream QEMU for these tasks which have historically required maintaining a QEMU fork downstream (like QEMUAFL https://github.com/AFLplusplus/qemuafl), which is tedious, error prone, and results in users missing out on enhancements to QEMU. A test is provided, compile: gcc -o tests/tcg/x86_64/inject-target tests/tcg/x86_64/inject-target.c And run: ./build/qemu-x86_64 -d plugin --plugin build/tests/tcg/plugins/libinject.so tests/tcg/x86_64/inject-target Hopefully after a number of tries, the inject plugin will inject the right value into the target program, leading to a victory message. This plugin handles simple "hypercalls", only one of which is implemented and injects data into guest memory. novafacing (3): Expose gdb_write_register function to consumers of gdbstub Add plugin API functions for register R/W, hwaddr R/W, vaddr W Add inject plugin and x86_64 target for the inject plugin gdbstub/gdbstub.c | 2 +- include/exec/gdbstub.h | 14 +++ include/qemu/qemu-plugin.h | 116 +++++++++++++++-- plugins/api.c | 66 +++++++++- tests/tcg/plugins/inject.c | 206 +++++++++++++++++++++++++++++++ tests/tcg/plugins/meson.build | 2 +- tests/tcg/x86_64/Makefile.target | 1 + tests/tcg/x86_64/inject-target.c | 27 ++++ 8 files changed, 418 insertions(+), 16 deletions(-) create mode 100644 tests/tcg/plugins/inject.c create mode 100644 tests/tcg/x86_64/inject-target.c -- 2.46.1
