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32 Commits
Author SHA1 Message Date
Ziyang ZhangandPierrick Bouvier 731525c276 plugins: use int64_t for the syscall filter return value 
The syscall return value passed back through the syscall filter
callback is semantically signed: negative values encode errno codes.
Declaring the sysret pointer as uint64_t * is therefore misleading and
forces callers to launder the value through an unsigned temporary.

Change the sysret pointer to int64_t * across the public plugin API
typedef (qemu_plugin_vcpu_syscall_filter_cb_t), the internal
qemu_plugin_vcpu_syscall_filter() prototypes and stub, its
implementation in plugins/core.c, the linux-user caller, and the
in-tree example plugins.

Signed-off-by: Ziyang Zhang <functioner@sjtu.edu.cn>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
Link: https://lore.kernel.org/qemu-devel/20260618082426.790315-2-functioner@sjtu.edu.cn
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-18 16:47:12 -07:00
Pierrick Bouvier 13c6930028 plugins: use consistent parameter documentation for userdata 
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-24-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier 25c6c15f7d plugins: add userdata to qemu_plugin_register_vcpu_syscall_ret_cb 
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-23-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier 6a6001021e plugins: remove qemu_plugin_id from qemu_plugin_vcpu_syscall_ret_cb_t 
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-22-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier d7706f7e89 plugins: add userdata to qemu_plugin_register_vcpu_syscall_filter_cb 
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-21-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier b8cdea393f plugins: remove qemu_plugin_id from qemu_plugin_vcpu_syscall_filter_cb_t 
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-20-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier 1abe87fd59 plugins: add userdata to qemu_plugin_register_vcpu_syscall_cb 
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-19-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier 0d71602089 plugins: remove qemu_plugin_id from qemu_plugin_vcpu_syscall_cb_t 
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-18-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier 285c40aaac plugins: add userdata to qemu_plugin_vcpu_tb_trans_cb_t 
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-17-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier ab24e19b42 plugins: remove qemu_plugin_id from qemu_plugin_vcpu_tb_trans_cb_t 
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-16-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier 65f399bce2 plugins: remove qemu_plugin_id from qemu_plugin_vcpu_discon_cb_t 
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-15-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier 041dca1e1b plugins: add userdata to qemu_plugin_register_vcpu_discon_cb 
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-14-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier 42e593c856 plugins: remove type qemu_plugin_vcpu_simple_cb_t 
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-13-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier 0079bbd8d5 plugins: add userdata to qemu_plugin_vcpu_for_each 
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-12-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier e12944179a plugins: add userdata to qemu_plugin_register_vcpu_resume_cb 
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-11-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier 89662f8903 plugins: add userdata to qemu_plugin_register_vcpu_idle_cb 
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-10-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier 214d9c0e33 plugins: add userdata to qemu_plugin_register_vcpu_exit_cb 
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-9-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier 7cb918441a plugins: add userdata to qemu_plugin_register_vcpu_init_cb 
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-8-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier 6be156bd4d plugins: remove qemu_plugin_id_t from qemu_plugin_vcpu_simple_cb_t 
Not used in all our plugins.
Future commits will remove qemu_plugin_vcpu_simple_cb_t completely, and
replace it with qemu_plugin_vcpu_udata_cb_t, so id information can be
passed using userdata if needed.

Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-7-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier 32a0ddf36a plugins: remove qemu_plugin_id_t from qemu_plugin_udata_cb_t 
We can now rely on userdata being always available to pass down this id
if needed.

In our plugins, only tests/tcg/plugins/reset.c was using it.

Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-6-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier de7c973f55 plugins: remove type qemu_plugin_simple_cb_t 
We removed all usage of this type, it can now be removed.

Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-5-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier 58ba4498d8 plugins: add userdata to qemu_plugin_register_flush_cb 
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-4-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier d3b790036a plugins: add userdata for qemu_plugin_{uninstall, reset} 
We do both at the same time because they internally use the same
implementation.

Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-3-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier e5dcb06798 plugins: bump version 
Next commits will be breaking changes, so bump min version and version
accordingly.

Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-2-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
 2026-06-16 10:59:05 -07:00
Pierrick Bouvier a08fff99be include/plugins/qemu-plugin.h: add note about endianness of value returned by qemu_plugin_mem_get_value 
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260325024252.3369186-3-pierrick.bouvier@linaro.org
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
 2026-03-25 14:51:15 -07:00
Stefan WeilandMichael Tokarev b7ae542de4 Fix several typos in documentation (found by codespell) 
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
[Mjt: add 2 fixes suggested by Peter: "as a" and "deactivate"]
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
 2026-03-23 19:55:24 +03:00
Florian HofhammerandPierrick Bouvier 71b424ca76 plugins: add missing docstrings to qemu-plugin.h 
This patch adds docstrings for typedefs and function declarations in
include/plugins/qemu-plugin.h that were previously missing. This
resolves inconsistencies in the docs, e.g., the description for
qemu_plugin_read_register() referring to qemu_plugin_register_flush_cb()
but code cache flush callbacks not being documented themselves.

Signed-off-by: Florian Hofhammer <florian.hofhammer@epfl.ch>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260311-add-missing-plugin-docs-v3-1-d68b9135e397@epfl.ch
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
 2026-03-11 12:30:17 -07:00
Florian HofhammerandPierrick Bouvier 0443c203c4 plugins: add missing callbacks to version history 
The discontinuity and system call filter callbacks were not reflected in
the versioning comments before. The callbacks have been introduced in
aac73d85d2 and
5ed628d1d3, respectively.

Signed-off-by: Florian Hofhammer <florian.hofhammer@epfl.ch>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Link: https://lore.kernel.org/qemu-devel/c4ecefb4-8769-403f-8420-8bce42e43e13@epfl.ch
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
 2026-03-05 10:54:09 -08:00
Florian HofhammerandPierrick Bouvier 3ebd871cbd plugins: add read-only property for registers 
Some registers should be marked as read-only from a plugin API
perspective, as writing to them via qemu_plugin_write_register has no
effect. This includes the program counter, and we expose this fact to
the plugins with this patch.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Florian Hofhammer <florian.hofhammer@epfl.ch>
Link: https://lore.kernel.org/qemu-devel/20260305-setpc-v5-v7-6-4c3adba52403@epfl.ch
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
 2026-03-05 10:54:09 -08:00
Florian HofhammerandPierrick Bouvier 4f55cd7801 plugins: add PC diversion API function 
This patch adds a plugin API function that allows diverting the program
counter during execution. A potential use case for this functionality is
to skip over parts of the code, e.g., by hooking into a specific
instruction and setting the PC to the next instruction in the callback.

Link: https://lists.nongnu.org/archive/html/qemu-devel/2025-08/msg00656.html
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Florian Hofhammer <florian.hofhammer@epfl.ch>
Link: https://lore.kernel.org/qemu-devel/20260305-setpc-v5-v7-4-4c3adba52403@epfl.ch
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
 2026-03-05 10:54:09 -08:00
Florian HofhammerandPierrick Bouvier d16ffa4244 plugins: add flag to specify whether PC is rw 
In addition to the flags specifying whether general-purpose registers
are read-write (rw) during a plugin callback, we add an additional flag
explicitly stating whether the PC is writable. This is in preparation of
a patch that allows to explicitly set the PC to divert control flow from
within a plugin callback, which is currently not possible.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Florian Hofhammer <florian.hofhammer@epfl.ch>
Link: https://lore.kernel.org/qemu-devel/20260305-setpc-v5-v7-2-4c3adba52403@epfl.ch
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
 2026-03-05 10:54:09 -08:00
Pierrick Bouvier cab15547f1 plugins: move qemu-plugin.h to include/plugins/ 
This change has two benefits:
- ensure plugins can't include anything else from QEMU than plugins API
- when compiling a C++ module, solves the header conflict with iostream
  header that includes transitively the wrong ctype.h, which already
  exists in include/qemu.

By Hyrum's law, there was already one usage of other headers with mem
plugin, which has been eliminated in previous commit.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260124182921.531562-7-pierrick.bouvier@linaro.org
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
 2026-01-29 09:34:14 -08:00