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tcg plugins: expose an API version concept

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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>
This commit is contained in:
Alex Bennée 2019-11-04 13:18:36 +00:00
parent 05273a43af
commit 3fb356cc86
10 changed files with 56 additions and 0 deletions
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21
plugins/loader.c
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@ -178,6 +178,25 @@ static int plugin_load(struct qemu_plugin_desc *desc, const qemu_info_t *info)
goto err_symbol;
}
if (!g_module_symbol(ctx->handle, "qemu_plugin_version", &sym)) {
error_report("TCG plugin %s does not declare API version %s",
desc->path, g_module_error());
goto err_symbol;
} else {
int version = *(int *)sym;
if (version < QEMU_PLUGIN_MIN_VERSION) {
error_report("TCG plugin %s requires API version %d, but "
"this QEMU supports only a minimum version of %d",
desc->path, version, QEMU_PLUGIN_MIN_VERSION);
goto err_symbol;
} else if (version > QEMU_PLUGIN_VERSION) {
error_report("TCG plugin %s requires API version %d, but "
"this QEMU supports only up to version %d",
desc->path, version, QEMU_PLUGIN_VERSION);
goto err_symbol;
}
}
qemu_rec_mutex_lock(&plugin.lock);
/* find an unused random id with &ctx as the seed */
@ -248,6 +267,8 @@ int qemu_plugin_load_list(QemuPluginList *head)
g_autofree qemu_info_t *info = g_new0(qemu_info_t, 1);
info->target_name = TARGET_NAME;
info->version.min = QEMU_PLUGIN_MIN_VERSION;
info->version.cur = QEMU_PLUGIN_VERSION;
#ifndef CONFIG_USER_ONLY
MachineState *ms = MACHINE(qdev_get_machine());
info->system_emulation = true;