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Re: [PATCH 12/15] plugin: propagate errors
From: |
Igor Mammedov |
Subject: |
Re: [PATCH 12/15] plugin: propagate errors |
Date: |
Mon, 7 Dec 2020 17:53:12 +0100 |
On Wed, 2 Dec 2020 03:18:51 -0500
Paolo Bonzini <pbonzini@redhat.com> wrote:
> qemu_finish_machine_init currently can only exit QEMU if it fails.
> Prepare for giving it proper error propagation, and possibly for
> adding a plugin_add monitor command that calls an accelerator
> method.
>
> While at it, make all errors from plugin_load look the same.
>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
> ---
> include/qemu/plugin.h | 4 ++--
> linux-user/main.c | 4 +---
> plugins/loader.c | 34 +++++++++++++++++-----------------
> softmmu/vl.c | 4 +---
> 4 files changed, 21 insertions(+), 25 deletions(-)
>
> diff --git a/include/qemu/plugin.h b/include/qemu/plugin.h
> index ab790ad105..841deed79c 100644
> --- a/include/qemu/plugin.h
> +++ b/include/qemu/plugin.h
> @@ -45,7 +45,7 @@ static inline void qemu_plugin_add_opts(void)
> }
>
> void qemu_plugin_opt_parse(const char *optarg, QemuPluginList *head);
> -int qemu_plugin_load_list(QemuPluginList *head);
> +int qemu_plugin_load_list(QemuPluginList *head, Error **errp);
>
> union qemu_plugin_cb_sig {
> qemu_plugin_simple_cb_t simple;
> @@ -199,7 +199,7 @@ static inline void qemu_plugin_opt_parse(const char
> *optarg,
> exit(1);
> }
>
> -static inline int qemu_plugin_load_list(QemuPluginList *head)
> +static inline int qemu_plugin_load_list(QemuPluginList *head, Error **errp)
> {
> return 0;
> }
> diff --git a/linux-user/main.c b/linux-user/main.c
> index 24d1eb73ad..750a01118f 100644
> --- a/linux-user/main.c
> +++ b/linux-user/main.c
> @@ -671,9 +671,7 @@ int main(int argc, char **argv, char **envp)
> exit(1);
> }
> trace_init_file();
> - if (qemu_plugin_load_list(&plugins)) {
> - exit(1);
> - }
> + qemu_plugin_load_list(&plugins, &error_fatal);
>
> /* Zero out regs */
> memset(regs, 0, sizeof(struct target_pt_regs));
> diff --git a/plugins/loader.c b/plugins/loader.c
> index 8ac5dbc20f..5cb9794fda 100644
> --- a/plugins/loader.c
> +++ b/plugins/loader.c
> @@ -150,7 +150,7 @@ static uint64_t xorshift64star(uint64_t x)
> return x * UINT64_C(2685821657736338717);
> }
>
> -static int plugin_load(struct qemu_plugin_desc *desc, const qemu_info_t
> *info)
> +static int plugin_load(struct qemu_plugin_desc *desc, const qemu_info_t
> *info, Error **errp)
> {
> qemu_plugin_install_func_t install;
> struct qemu_plugin_ctx *ctx;
> @@ -163,37 +163,37 @@ static int plugin_load(struct qemu_plugin_desc *desc,
> const qemu_info_t *info)
>
> ctx->handle = g_module_open(desc->path, G_MODULE_BIND_LOCAL);
> if (ctx->handle == NULL) {
> - error_report("%s: %s", __func__, g_module_error());
> + error_setg(errp, "Could not load plugin %s: %s", desc->path,
> g_module_error());
> goto err_dlopen;
> }
>
> if (!g_module_symbol(ctx->handle, "qemu_plugin_install", &sym)) {
> - error_report("%s: %s", __func__, g_module_error());
> + error_setg(errp, "Could not load plugin %s: %s", desc->path,
> g_module_error());
> goto err_symbol;
> }
> install = (qemu_plugin_install_func_t) sym;
> /* symbol was found; it could be NULL though */
> if (install == NULL) {
> - error_report("%s: %s: qemu_plugin_install is NULL",
> - __func__, desc->path);
> + error_setg(errp, "Could not load plugin %s: qemu_plugin_install is
> NULL",
> + desc->path);
> 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());
> + error_setg(errp, "Could not load plugin %s: plugin 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);
> + error_setg(errp, "Could not load plugin %s: plugin 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);
> + error_setg(errp, "Could not load plugin %s: plugin requires API
> version %d, but "
> + "this QEMU supports only up to version %d",
> + desc->path, version, QEMU_PLUGIN_VERSION);
> goto err_symbol;
> }
> }
> @@ -220,8 +220,8 @@ static int plugin_load(struct qemu_plugin_desc *desc,
> const qemu_info_t *info)
> rc = install(ctx->id, info, desc->argc, desc->argv);
> ctx->installing = false;
> if (rc) {
> - error_report("%s: qemu_plugin_install returned error code %d",
> - __func__, rc);
> + error_setg(errp, "Could not load plugin %s: qemu_plugin_install
> returned error code %d",
> + desc->path, rc);
> /*
> * we cannot rely on the plugin doing its own cleanup, so
> * call a full uninstall if the plugin did not yet call it.
> @@ -263,7 +263,7 @@ static void plugin_desc_free(struct qemu_plugin_desc
> *desc)
> * Note: the descriptor of each successfully installed plugin is removed
> * from the list given by @head.
> */
> -int qemu_plugin_load_list(QemuPluginList *head)
> +int qemu_plugin_load_list(QemuPluginList *head, Error **errp)
> {
> struct qemu_plugin_desc *desc, *next;
> g_autofree qemu_info_t *info = g_new0(qemu_info_t, 1);
> @@ -283,7 +283,7 @@ int qemu_plugin_load_list(QemuPluginList *head)
> QTAILQ_FOREACH_SAFE(desc, head, entry, next) {
> int err;
>
> - err = plugin_load(desc, info);
> + err = plugin_load(desc, info, errp);
> if (err) {
> return err;
> }
> diff --git a/softmmu/vl.c b/softmmu/vl.c
> index e5f3c42049..0f63d80472 100644
> --- a/softmmu/vl.c
> +++ b/softmmu/vl.c
> @@ -2417,9 +2417,7 @@ static void qemu_init_board(void)
> }
>
> /* process plugin before CPUs are created, but once -smp has been parsed
> */
> - if (qemu_plugin_load_list(&plugin_list)) {
> - exit(1);
> - }
> + qemu_plugin_load_list(&plugin_list, &error_fatal);
>
> /* From here on we enter MACHINE_PHASE_INITIALIZED. */
> machine_run_board_init(current_machine);
- [PATCH 01/15] remove preconfig state, (continued)
- [PATCH 05/15] vl: extract softmmu/globals.c, Paolo Bonzini, 2020/12/02
- [PATCH 02/15] vl: remove separate preconfig main_loop, Paolo Bonzini, 2020/12/02
- [PATCH 04/15] vl: extract softmmu/runstate.c, Paolo Bonzini, 2020/12/02
- [PATCH 12/15] plugin: propagate errors, Paolo Bonzini, 2020/12/02
- [PATCH 13/15] memory: allow creating MemoryRegions before accelerators, Paolo Bonzini, 2020/12/02
- [PATCH 09/15] machine: record whether nvdimm= was set, Paolo Bonzini, 2020/12/02
- [PATCH 07/15] chardev: do not use machine_init_done, Paolo Bonzini, 2020/12/02
- [PATCH 15/15] monitor: allow quitting while in preconfig state, Paolo Bonzini, 2020/12/02