3fb356cc86
This is a very simple versioning API which allows the plugin infrastructure to check the API a plugin was built against. We also expose a min/cur API version to the plugin via the info block in case it wants to avoid using old deprecated APIs in the future. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Robert Foley <robert.foley@linaro.org>
413 lines
14 KiB
C
413 lines
14 KiB
C
/*
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* Copyright (C) 2017, Emilio G. Cota <cota@braap.org>
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* Copyright (C) 2019, Linaro
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*
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* License: GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef QEMU_PLUGIN_API_H
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#define QEMU_PLUGIN_API_H
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#include <inttypes.h>
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#include <stdbool.h>
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/*
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* For best performance, build the plugin with -fvisibility=hidden so that
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* QEMU_PLUGIN_LOCAL is implicit. Then, just mark qemu_plugin_install with
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* QEMU_PLUGIN_EXPORT. For more info, see
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* https://gcc.gnu.org/wiki/Visibility
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*/
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#if defined _WIN32 || defined __CYGWIN__
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#ifdef BUILDING_DLL
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#define QEMU_PLUGIN_EXPORT __declspec(dllexport)
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#else
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#define QEMU_PLUGIN_EXPORT __declspec(dllimport)
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#endif
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#define QEMU_PLUGIN_LOCAL
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#else
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#if __GNUC__ >= 4
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#define QEMU_PLUGIN_EXPORT __attribute__((visibility("default")))
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#define QEMU_PLUGIN_LOCAL __attribute__((visibility("hidden")))
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#else
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#define QEMU_PLUGIN_EXPORT
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#define QEMU_PLUGIN_LOCAL
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#endif
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#endif
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typedef uint64_t qemu_plugin_id_t;
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/*
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* Versioning plugins:
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*
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* The plugin API will pass a minimum and current API version that
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* QEMU currently supports. The minimum API will be incremented if an
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* API needs to be deprecated.
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*
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* The plugins export the API they were built against by exposing the
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* symbol qemu_plugin_version which can be checked.
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*/
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extern QEMU_PLUGIN_EXPORT int qemu_plugin_version;
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#define QEMU_PLUGIN_VERSION 0
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typedef struct {
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/* string describing architecture */
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const char *target_name;
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struct {
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int min;
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int cur;
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} version;
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/* is this a full system emulation? */
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bool system_emulation;
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union {
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/*
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* smp_vcpus may change if vCPUs can be hot-plugged, max_vcpus
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* is the system-wide limit.
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*/
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struct {
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int smp_vcpus;
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int max_vcpus;
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} system;
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};
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} qemu_info_t;
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/**
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* qemu_plugin_install() - Install a plugin
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* @id: this plugin's opaque ID
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* @info: a block describing some details about the guest
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* @argc: number of arguments
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* @argv: array of arguments (@argc elements)
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*
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* All plugins must export this symbol.
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*
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* Note: Calling qemu_plugin_uninstall() from this function is a bug. To raise
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* an error during install, return !0.
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*
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* Note: @info is only live during the call. Copy any information we
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* want to keep.
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*
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* Note: @argv remains valid throughout the lifetime of the loaded plugin.
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*/
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QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
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const qemu_info_t *info,
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int argc, char **argv);
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/*
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* Prototypes for the various callback styles we will be registering
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* in the following functions.
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*/
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typedef void (*qemu_plugin_simple_cb_t)(qemu_plugin_id_t id);
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typedef void (*qemu_plugin_udata_cb_t)(qemu_plugin_id_t id, void *userdata);
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typedef void (*qemu_plugin_vcpu_simple_cb_t)(qemu_plugin_id_t id,
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unsigned int vcpu_index);
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typedef void (*qemu_plugin_vcpu_udata_cb_t)(unsigned int vcpu_index,
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void *userdata);
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/**
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* qemu_plugin_uninstall() - Uninstall a plugin
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* @id: this plugin's opaque ID
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* @cb: callback to be called once the plugin has been removed
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*
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* Do NOT assume that the plugin has been uninstalled once this function
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* returns. Plugins are uninstalled asynchronously, and therefore the given
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* plugin receives callbacks until @cb is called.
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*
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* Note: Calling this function from qemu_plugin_install() is a bug.
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*/
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void qemu_plugin_uninstall(qemu_plugin_id_t id, qemu_plugin_simple_cb_t cb);
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/**
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* qemu_plugin_reset() - Reset a plugin
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* @id: this plugin's opaque ID
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* @cb: callback to be called once the plugin has been reset
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*
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* Unregisters all callbacks for the plugin given by @id.
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*
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* Do NOT assume that the plugin has been reset once this function returns.
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* Plugins are reset asynchronously, and therefore the given plugin receives
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* callbacks until @cb is called.
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*/
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void qemu_plugin_reset(qemu_plugin_id_t id, qemu_plugin_simple_cb_t cb);
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/**
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* qemu_plugin_register_vcpu_init_cb() - register a vCPU initialization callback
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* @id: plugin ID
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* @cb: callback function
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*
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* The @cb function is called every time a vCPU is initialized.
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*
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* See also: qemu_plugin_register_vcpu_exit_cb()
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*/
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void qemu_plugin_register_vcpu_init_cb(qemu_plugin_id_t id,
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qemu_plugin_vcpu_simple_cb_t cb);
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/**
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* qemu_plugin_register_vcpu_exit_cb() - register a vCPU exit callback
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* @id: plugin ID
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* @cb: callback function
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*
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* The @cb function is called every time a vCPU exits.
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*
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* See also: qemu_plugin_register_vcpu_init_cb()
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*/
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void qemu_plugin_register_vcpu_exit_cb(qemu_plugin_id_t id,
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qemu_plugin_vcpu_simple_cb_t cb);
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/**
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* qemu_plugin_register_vcpu_idle_cb() - register a vCPU idle callback
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* @id: plugin ID
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* @cb: callback function
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*
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* The @cb function is called every time a vCPU idles.
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*/
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void qemu_plugin_register_vcpu_idle_cb(qemu_plugin_id_t id,
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qemu_plugin_vcpu_simple_cb_t cb);
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/**
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* qemu_plugin_register_vcpu_resume_cb() - register a vCPU resume callback
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* @id: plugin ID
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* @cb: callback function
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*
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* The @cb function is called every time a vCPU resumes execution.
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*/
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void qemu_plugin_register_vcpu_resume_cb(qemu_plugin_id_t id,
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qemu_plugin_vcpu_simple_cb_t cb);
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/*
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* Opaque types that the plugin is given during the translation and
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* instrumentation phase.
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*/
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struct qemu_plugin_tb;
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struct qemu_plugin_insn;
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enum qemu_plugin_cb_flags {
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QEMU_PLUGIN_CB_NO_REGS, /* callback does not access the CPU's regs */
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QEMU_PLUGIN_CB_R_REGS, /* callback reads the CPU's regs */
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QEMU_PLUGIN_CB_RW_REGS, /* callback reads and writes the CPU's regs */
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};
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enum qemu_plugin_mem_rw {
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QEMU_PLUGIN_MEM_R = 1,
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QEMU_PLUGIN_MEM_W,
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QEMU_PLUGIN_MEM_RW,
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};
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/**
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* qemu_plugin_register_vcpu_tb_trans_cb() - register a translate cb
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* @id: plugin ID
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* @cb: callback function
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*
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* The @cb function is called every time a translation occurs. The @cb
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* function is passed an opaque qemu_plugin_type which it can query
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* for additional information including the list of translated
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* instructions. At this point the plugin can register further
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* callbacks to be triggered when the block or individual instruction
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* executes.
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*/
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typedef void (*qemu_plugin_vcpu_tb_trans_cb_t)(qemu_plugin_id_t id,
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struct qemu_plugin_tb *tb);
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void qemu_plugin_register_vcpu_tb_trans_cb(qemu_plugin_id_t id,
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qemu_plugin_vcpu_tb_trans_cb_t cb);
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/**
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* qemu_plugin_register_vcpu_tb_trans_exec_cb() - register execution callback
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* @tb: the opaque qemu_plugin_tb handle for the translation
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* @cb: callback function
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* @flags: does the plugin read or write the CPU's registers?
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* @userdata: any plugin data to pass to the @cb?
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*
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* The @cb function is called every time a translated unit executes.
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*/
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void qemu_plugin_register_vcpu_tb_exec_cb(struct qemu_plugin_tb *tb,
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qemu_plugin_vcpu_udata_cb_t cb,
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enum qemu_plugin_cb_flags flags,
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void *userdata);
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enum qemu_plugin_op {
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QEMU_PLUGIN_INLINE_ADD_U64,
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};
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/**
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* qemu_plugin_register_vcpu_tb_trans_exec_inline() - execution inline op
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* @tb: the opaque qemu_plugin_tb handle for the translation
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* @op: the type of qemu_plugin_op (e.g. ADD_U64)
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* @ptr: the target memory location for the op
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* @imm: the op data (e.g. 1)
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*
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* Insert an inline op to every time a translated unit executes.
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* Useful if you just want to increment a single counter somewhere in
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* memory.
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*/
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void qemu_plugin_register_vcpu_tb_exec_inline(struct qemu_plugin_tb *tb,
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enum qemu_plugin_op op,
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void *ptr, uint64_t imm);
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/**
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* qemu_plugin_register_vcpu_insn_exec_cb() - register insn execution cb
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* @insn: the opaque qemu_plugin_insn handle for an instruction
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* @cb: callback function
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* @flags: does the plugin read or write the CPU's registers?
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* @userdata: any plugin data to pass to the @cb?
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*
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* The @cb function is called every time an instruction is executed
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*/
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void qemu_plugin_register_vcpu_insn_exec_cb(struct qemu_plugin_insn *insn,
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qemu_plugin_vcpu_udata_cb_t cb,
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enum qemu_plugin_cb_flags flags,
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void *userdata);
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/**
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* qemu_plugin_register_vcpu_insn_exec_inline() - insn execution inline op
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* @insn: the opaque qemu_plugin_insn handle for an instruction
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* @cb: callback function
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* @op: the type of qemu_plugin_op (e.g. ADD_U64)
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* @ptr: the target memory location for the op
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* @imm: the op data (e.g. 1)
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*
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* Insert an inline op to every time an instruction executes. Useful
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* if you just want to increment a single counter somewhere in memory.
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*/
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void qemu_plugin_register_vcpu_insn_exec_inline(struct qemu_plugin_insn *insn,
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enum qemu_plugin_op op,
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void *ptr, uint64_t imm);
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/*
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* Helpers to query information about the instructions in a block
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*/
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size_t qemu_plugin_tb_n_insns(const struct qemu_plugin_tb *tb);
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uint64_t qemu_plugin_tb_vaddr(const struct qemu_plugin_tb *tb);
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struct qemu_plugin_insn *
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qemu_plugin_tb_get_insn(const struct qemu_plugin_tb *tb, size_t idx);
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const void *qemu_plugin_insn_data(const struct qemu_plugin_insn *insn);
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size_t qemu_plugin_insn_size(const struct qemu_plugin_insn *insn);
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uint64_t qemu_plugin_insn_vaddr(const struct qemu_plugin_insn *insn);
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void *qemu_plugin_insn_haddr(const struct qemu_plugin_insn *insn);
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/*
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* Memory Instrumentation
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*
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* The anonymous qemu_plugin_meminfo_t and qemu_plugin_hwaddr types
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* can be used in queries to QEMU to get more information about a
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* given memory access.
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*/
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typedef uint32_t qemu_plugin_meminfo_t;
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struct qemu_plugin_hwaddr;
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/* meminfo queries */
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unsigned int qemu_plugin_mem_size_shift(qemu_plugin_meminfo_t info);
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bool qemu_plugin_mem_is_sign_extended(qemu_plugin_meminfo_t info);
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bool qemu_plugin_mem_is_big_endian(qemu_plugin_meminfo_t info);
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bool qemu_plugin_mem_is_store(qemu_plugin_meminfo_t info);
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/*
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* qemu_plugin_get_hwaddr():
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* @vaddr: the virtual address of the memory operation
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*
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* For system emulation returns a qemu_plugin_hwaddr handle to query
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* details about the actual physical address backing the virtual
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* address. For linux-user guests it just returns NULL.
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*
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* This handle is *only* valid for the duration of the callback. Any
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* information about the handle should be recovered before the
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* callback returns.
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*/
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struct qemu_plugin_hwaddr *qemu_plugin_get_hwaddr(qemu_plugin_meminfo_t info,
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uint64_t vaddr);
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/*
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* The following additional queries can be run on the hwaddr structure
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* to return information about it. For non-IO accesses the device
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* offset will be into the appropriate block of RAM.
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*/
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bool qemu_plugin_hwaddr_is_io(struct qemu_plugin_hwaddr *hwaddr);
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uint64_t qemu_plugin_hwaddr_device_offset(const struct qemu_plugin_hwaddr *haddr);
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typedef void
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(*qemu_plugin_vcpu_mem_cb_t)(unsigned int vcpu_index,
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qemu_plugin_meminfo_t info, uint64_t vaddr,
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void *userdata);
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void qemu_plugin_register_vcpu_mem_cb(struct qemu_plugin_insn *insn,
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qemu_plugin_vcpu_mem_cb_t cb,
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enum qemu_plugin_cb_flags flags,
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enum qemu_plugin_mem_rw rw,
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void *userdata);
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void qemu_plugin_register_vcpu_mem_inline(struct qemu_plugin_insn *insn,
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enum qemu_plugin_mem_rw rw,
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enum qemu_plugin_op op, void *ptr,
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uint64_t imm);
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typedef void
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(*qemu_plugin_vcpu_syscall_cb_t)(qemu_plugin_id_t id, unsigned int vcpu_index,
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int64_t num, uint64_t a1, uint64_t a2,
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uint64_t a3, uint64_t a4, uint64_t a5,
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uint64_t a6, uint64_t a7, uint64_t a8);
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void qemu_plugin_register_vcpu_syscall_cb(qemu_plugin_id_t id,
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qemu_plugin_vcpu_syscall_cb_t cb);
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typedef void
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(*qemu_plugin_vcpu_syscall_ret_cb_t)(qemu_plugin_id_t id, unsigned int vcpu_idx,
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int64_t num, int64_t ret);
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void
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qemu_plugin_register_vcpu_syscall_ret_cb(qemu_plugin_id_t id,
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qemu_plugin_vcpu_syscall_ret_cb_t cb);
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/**
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* qemu_plugin_insn_disas() - return disassembly string for instruction
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* @insn: instruction reference
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*
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* Returns an allocated string containing the disassembly
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*/
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char *qemu_plugin_insn_disas(const struct qemu_plugin_insn *insn);
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/**
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* qemu_plugin_vcpu_for_each() - iterate over the existing vCPU
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* @id: plugin ID
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* @cb: callback function
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*
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* The @cb function is called once for each existing vCPU.
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*
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* See also: qemu_plugin_register_vcpu_init_cb()
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*/
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void qemu_plugin_vcpu_for_each(qemu_plugin_id_t id,
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qemu_plugin_vcpu_simple_cb_t cb);
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void qemu_plugin_register_flush_cb(qemu_plugin_id_t id,
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qemu_plugin_simple_cb_t cb);
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void qemu_plugin_register_atexit_cb(qemu_plugin_id_t id,
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qemu_plugin_udata_cb_t cb, void *userdata);
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/* returns -1 in user-mode */
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int qemu_plugin_n_vcpus(void);
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/* returns -1 in user-mode */
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int qemu_plugin_n_max_vcpus(void);
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/**
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* qemu_plugin_outs() - output string via QEMU's logging system
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* @string: a string
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*/
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void qemu_plugin_outs(const char *string);
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#endif /* QEMU_PLUGIN_API_H */
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