1 /* 2 * Plugin Shared Internal Functions 3 * 4 * Copyright (C) 2019, Linaro 5 * 6 * License: GNU GPL, version 2 or later. 7 * See the COPYING file in the top-level directory. 8 * 9 * SPDX-License-Identifier: GPL-2.0-or-later 10 */ 11 12 #ifndef PLUGIN_H 13 #define PLUGIN_H 14 15 #include <gmodule.h> 16 #include "qemu/qht.h" 17 18 #define QEMU_PLUGIN_MIN_VERSION 2 19 20 /* global state */ 21 struct qemu_plugin_state { 22 QTAILQ_HEAD(, qemu_plugin_ctx) ctxs; 23 QLIST_HEAD(, qemu_plugin_cb) cb_lists[QEMU_PLUGIN_EV_MAX]; 24 /* 25 * Use the HT as a hash map by inserting k == v, which saves memory as 26 * documented by GLib. The parent struct is obtained with container_of(). 27 */ 28 GHashTable *id_ht; 29 /* 30 * Use the HT as a hash map. Note that we could use a list here, 31 * but with the HT we avoid adding a field to CPUState. 32 */ 33 GHashTable *cpu_ht; 34 DECLARE_BITMAP(mask, QEMU_PLUGIN_EV_MAX); 35 /* 36 * @lock protects the struct as well as ctx->uninstalling. 37 * The lock must be acquired by all API ops. 38 * The lock is recursive, which greatly simplifies things, e.g. 39 * callback registration from qemu_plugin_vcpu_for_each(). 40 */ 41 QemuRecMutex lock; 42 /* 43 * HT of callbacks invoked from helpers. All entries are freed when 44 * the code cache is flushed. 45 */ 46 struct qht dyn_cb_arr_ht; 47 /* How many vcpus were started */ 48 int num_vcpus; 49 }; 50 51 52 struct qemu_plugin_ctx { 53 GModule *handle; 54 qemu_plugin_id_t id; 55 struct qemu_plugin_cb *callbacks[QEMU_PLUGIN_EV_MAX]; 56 QTAILQ_ENTRY(qemu_plugin_ctx) entry; 57 /* 58 * keep a reference to @desc until uninstall, so that plugins do not have 59 * to strdup plugin args. 60 */ 61 struct qemu_plugin_desc *desc; 62 bool installing; 63 bool uninstalling; 64 bool resetting; 65 }; 66 67 struct qemu_plugin_ctx *plugin_id_to_ctx_locked(qemu_plugin_id_t id); 68 69 void plugin_register_inline_op(GArray **arr, 70 enum qemu_plugin_mem_rw rw, 71 enum qemu_plugin_op op, void *ptr, 72 uint64_t imm); 73 74 void plugin_reset_uninstall(qemu_plugin_id_t id, 75 qemu_plugin_simple_cb_t cb, 76 bool reset); 77 78 void plugin_register_cb(qemu_plugin_id_t id, enum qemu_plugin_event ev, 79 void *func); 80 81 void plugin_unregister_cb__locked(struct qemu_plugin_ctx *ctx, 82 enum qemu_plugin_event ev); 83 84 void 85 plugin_register_cb_udata(qemu_plugin_id_t id, enum qemu_plugin_event ev, 86 void *func, void *udata); 87 88 void 89 plugin_register_dyn_cb__udata(GArray **arr, 90 qemu_plugin_vcpu_udata_cb_t cb, 91 enum qemu_plugin_cb_flags flags, void *udata); 92 93 94 void plugin_register_vcpu_mem_cb(GArray **arr, 95 void *cb, 96 enum qemu_plugin_cb_flags flags, 97 enum qemu_plugin_mem_rw rw, 98 void *udata); 99 100 void exec_inline_op(struct qemu_plugin_dyn_cb *cb); 101 102 int plugin_num_vcpus(void); 103 104 #endif /* PLUGIN_H */ 105