On 02/03/2026 14:53, Florian Hofhammer wrote:
> Hi,
>
> This patch series builds on top of the discussion from the thread at
> https://lore.kernel.org/qemu-devel/e9bcd7c7-2d67-469e-b2f3-d1a68e456b2b@epfl.ch/
> and adds a plugin API function to set the program counter of the guest,
> as just writing to it via qemu_plugin_write_register() has no direct
> effect.
>
> This version v5 of the patch series addresses the requested changes from
> the previous v4 submission (details below).
> Note: checkpatch.pl still reports a warning about line length violations
> in patch nr. 6/7 but I did not fix this, as the line was already > 80
> characters long previously, the change added only a single character,
> and I think the readability of the code is better as it is now. Please
> let me know if you disagree and would like me to fix this!
>
> Best regards,
> Florian
>
> Changes:
> v5:
> - make QEMU abort via asserts instead of just returning an error from
> the plugin API if preconditions are violated
> - extend tests for qemu_plugin_set_pc() to different contexts
> - fix issues highlighted by checkpatch.pl
> v4:
> - switch strcmp out in favor of g_strcmp0
> - split the patch introducing the qemu_plugin_set_pc() API into three
> patches, two for preparing the plugin infrastructure and the syscall
> handling code and a third introducing the actual plugin API
> v3:
> - make PC registers read-only across architectures
> - add tests for read-only registers
> - adjust test structure for qemu_plugin_set_pc() by moving
> architecture-specific tests into corresponding directories
> v2:
> - add setjmp() in syscall handling path to allow PC redirection from
> syscall callbacks (via longjmp(), the cpu_loop()'s setjmp() for
> exiting a TB would not be live anymore in syscall handlers)
> - add flags to ensure the qemu_plugin_set_pc() API is only called from
> contexts where the CPU is live
> - add test for qemu_plugin_set_pc() API
> v1:
> - initial version
>
>
> Florian Hofhammer (7):
> plugins: add flag to specify whether PC is rw
> linux-user: make syscall emulation interruptible
> plugins: add PC diversion API function
> tests/tcg: add test for qemu_plugin_set_pc API
> plugins: add read-only property for registers
> plugins: prohibit writing to read-only registers
> tests/tcg/plugins: test register accesses
>
> MAINTAINERS | 1 +
> include/plugins/qemu-plugin.h | 19 +++
> linux-user/aarch64/cpu_loop.c | 2 +-
> linux-user/alpha/cpu_loop.c | 2 +-
> linux-user/arm/cpu_loop.c | 2 +-
> linux-user/hexagon/cpu_loop.c | 2 +-
> linux-user/hppa/cpu_loop.c | 1 +
> linux-user/i386/cpu_loop.c | 8 +-
> linux-user/include/special-errno.h | 8 +
> linux-user/loongarch64/cpu_loop.c | 5 +-
> linux-user/m68k/cpu_loop.c | 2 +-
> linux-user/microblaze/cpu_loop.c | 2 +-
> linux-user/mips/cpu_loop.c | 9 +-
> linux-user/or1k/cpu_loop.c | 2 +-
> linux-user/ppc/cpu_loop.c | 10 +-
> linux-user/riscv/cpu_loop.c | 2 +-
> linux-user/s390x/cpu_loop.c | 2 +-
> linux-user/sh4/cpu_loop.c | 2 +-
> linux-user/sparc/cpu_loop.c | 4 +-
> linux-user/syscall.c | 16 ++
> linux-user/xtensa/cpu_loop.c | 1 +
> plugins/api.c | 42 +++++-
> plugins/core.c | 29 ++--
> tests/tcg/arm/Makefile.target | 6 +
> tests/tcg/multiarch/Makefile.target | 17 ++-
> .../{ => plugin}/check-plugin-output.sh | 0
> .../{ => plugin}/test-plugin-mem-access.c | 0
> .../tcg/multiarch/plugin/test-plugin-set-pc.c | 140 ++++++++++++++++++
> tests/tcg/plugins/meson.build | 2 +
> tests/tcg/plugins/registers.c | 79 ++++++++++
> tests/tcg/plugins/setpc.c | 120 +++++++++++++++
> 31 files changed, 495 insertions(+), 42 deletions(-)
> rename tests/tcg/multiarch/{ => plugin}/check-plugin-output.sh (100%)
> rename tests/tcg/multiarch/{ => plugin}/test-plugin-mem-access.c (100%)
> create mode 100644 tests/tcg/multiarch/plugin/test-plugin-set-pc.c
> create mode 100644 tests/tcg/plugins/registers.c
> create mode 100644 tests/tcg/plugins/setpc.c
>
>
> base-commit: ffcf1a7981793973ffbd8100a7c3c6042d02ae23
Please ignore this patch series, I will send a v6 version soon.
Sorry for the inconvenience and thanks for your understanding!
Best regards,
Florian