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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>
100 lines
3.0 KiB
C
100 lines
3.0 KiB
C
/*
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* Plugin Shared Internal Functions
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*
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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 _PLUGIN_INTERNAL_H_
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#define _PLUGIN_INTERNAL_H_
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#include <gmodule.h>
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#define QEMU_PLUGIN_MIN_VERSION 0
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/* global state */
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struct qemu_plugin_state {
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QTAILQ_HEAD(, qemu_plugin_ctx) ctxs;
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QLIST_HEAD(, qemu_plugin_cb) cb_lists[QEMU_PLUGIN_EV_MAX];
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/*
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* Use the HT as a hash map by inserting k == v, which saves memory as
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* documented by GLib. The parent struct is obtained with container_of().
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*/
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GHashTable *id_ht;
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/*
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* Use the HT as a hash map. Note that we could use a list here,
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* but with the HT we avoid adding a field to CPUState.
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*/
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GHashTable *cpu_ht;
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DECLARE_BITMAP(mask, QEMU_PLUGIN_EV_MAX);
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/*
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* @lock protects the struct as well as ctx->uninstalling.
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* The lock must be acquired by all API ops.
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* The lock is recursive, which greatly simplifies things, e.g.
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* callback registration from qemu_plugin_vcpu_for_each().
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*/
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QemuRecMutex lock;
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/*
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* HT of callbacks invoked from helpers. All entries are freed when
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* the code cache is flushed.
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*/
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struct qht dyn_cb_arr_ht;
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};
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struct qemu_plugin_ctx {
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GModule *handle;
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qemu_plugin_id_t id;
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struct qemu_plugin_cb *callbacks[QEMU_PLUGIN_EV_MAX];
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QTAILQ_ENTRY(qemu_plugin_ctx) entry;
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/*
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* keep a reference to @desc until uninstall, so that plugins do not have
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* to strdup plugin args.
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*/
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struct qemu_plugin_desc *desc;
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bool installing;
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bool uninstalling;
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bool resetting;
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};
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struct qemu_plugin_ctx *plugin_id_to_ctx_locked(qemu_plugin_id_t id);
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void plugin_register_inline_op(GArray **arr,
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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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void plugin_reset_uninstall(qemu_plugin_id_t id,
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qemu_plugin_simple_cb_t cb,
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bool reset);
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void plugin_register_cb(qemu_plugin_id_t id, enum qemu_plugin_event ev,
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void *func);
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void plugin_unregister_cb__locked(struct qemu_plugin_ctx *ctx,
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enum qemu_plugin_event ev);
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void
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plugin_register_cb_udata(qemu_plugin_id_t id, enum qemu_plugin_event ev,
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void *func, void *udata);
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void
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plugin_register_dyn_cb__udata(GArray **arr,
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qemu_plugin_vcpu_udata_cb_t cb,
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enum qemu_plugin_cb_flags flags, void *udata);
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void plugin_register_vcpu_mem_cb(GArray **arr,
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void *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 *udata);
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void exec_inline_op(struct qemu_plugin_dyn_cb *cb);
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#endif /* _PLUGIN_INTERNAL_H_ */
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