* [PATCH v3 1/3] qemu-config: parse configuration files to a QDict
2021-05-21 10:21 [PATCH v3 0/3] vl: add -object support back into -readconfig Paolo Bonzini
@ 2021-05-21 10:21 ` Paolo Bonzini
2021-05-21 16:09 ` Kevin Wolf
2021-05-21 10:21 ` [PATCH v3 2/3] vl: plumb keyval-based options into -readconfig Paolo Bonzini
2021-05-21 10:21 ` [PATCH v3 3/3] vl: plug -object back " Paolo Bonzini
2 siblings, 1 reply; 6+ messages in thread
From: Paolo Bonzini @ 2021-05-21 10:21 UTC (permalink / raw)
To: qemu-devel; +Cc: kwolf, armbru, qemu-stable
Change the parser to put the values into a QDict and pass them
to a callback. qemu_config_parse's QemuOpts creation is
itself turned into a callback function.
This is useful for -readconfig to support keyval-based options;
getting a QDict from the parser removes a roundtrip from
QDict to QemuOpts and then back to QDict.
Unfortunately there is a disadvantage in that semantic errors will
point to the last line of the group, because the entries of the QDict
do not have a location attached.
Cc: Kevin Wolf <kwolf@redhat.com>
Cc: Markus Armbruster <armbru@redhat.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
v1->v2: check for unrecognized entries in the QDict, move a loc_pop for
better error messages
v2->v3: fix error propagation
include/qemu/config-file.h | 7 ++-
softmmu/vl.c | 4 +-
util/qemu-config.c | 98 ++++++++++++++++++++++++++------------
3 files changed, 76 insertions(+), 33 deletions(-)
diff --git a/include/qemu/config-file.h b/include/qemu/config-file.h
index 0500b3668d..f605423321 100644
--- a/include/qemu/config-file.h
+++ b/include/qemu/config-file.h
@@ -1,6 +1,8 @@
#ifndef QEMU_CONFIG_FILE_H
#define QEMU_CONFIG_FILE_H
+typedef void QEMUConfigCB(const char *group, QDict *qdict, void *opaque, Error **errp);
+
void qemu_load_module_for_opts(const char *group);
QemuOptsList *qemu_find_opts(const char *group);
QemuOptsList *qemu_find_opts_err(const char *group, Error **errp);
@@ -14,7 +16,10 @@ void qemu_config_write(FILE *fp);
int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname,
Error **errp);
-int qemu_read_config_file(const char *filename, Error **errp);
+/* A default callback for qemu_read_config_file(). */
+void qemu_config_do_parse(const char *group, QDict *qdict, void *opaque, Error **errp);
+
+int qemu_read_config_file(const char *filename, QEMUConfigCB *f, Error **errp);
/* Parse QDict options as a replacement for a config file (allowing multiple
enumerated (0..(n-1)) configuration "sections") */
diff --git a/softmmu/vl.c b/softmmu/vl.c
index 6054f6f0b9..47dfdd704f 100644
--- a/softmmu/vl.c
+++ b/softmmu/vl.c
@@ -2133,7 +2133,7 @@ static void qemu_read_default_config_file(Error **errp)
int ret;
g_autofree char *file = get_relocated_path(CONFIG_QEMU_CONFDIR "/qemu.conf");
- ret = qemu_read_config_file(file, errp);
+ ret = qemu_read_config_file(file, qemu_config_do_parse, errp);
if (ret < 0) {
if (ret == -ENOENT) {
error_free(*errp);
@@ -3399,7 +3399,7 @@ void qemu_init(int argc, char **argv, char **envp)
qemu_plugin_opt_parse(optarg, &plugin_list);
break;
case QEMU_OPTION_readconfig:
- qemu_read_config_file(optarg, &error_fatal);
+ qemu_read_config_file(optarg, qemu_config_do_parse, &error_fatal);
break;
case QEMU_OPTION_spice:
olist = qemu_find_opts_err("spice", NULL);
diff --git a/util/qemu-config.c b/util/qemu-config.c
index 34974c4b47..33143cd4be 100644
--- a/util/qemu-config.c
+++ b/util/qemu-config.c
@@ -2,6 +2,7 @@
#include "block/qdict.h" /* for qdict_extract_subqdict() */
#include "qapi/error.h"
#include "qapi/qapi-commands-misc.h"
+#include "qapi/qmp/qerror.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qlist.h"
#include "qemu/error-report.h"
@@ -351,19 +352,19 @@ void qemu_config_write(FILE *fp)
}
/* Returns number of config groups on success, -errno on error */
-int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname, Error **errp)
+static int qemu_config_foreach(FILE *fp, QEMUConfigCB *cb, void *opaque,
+ const char *fname, Error **errp)
{
- char line[1024], group[64], id[64], arg[64], value[1024];
+ char line[1024], prev_group[64], group[64], arg[64], value[1024];
Location loc;
- QemuOptsList *list = NULL;
Error *local_err = NULL;
- QemuOpts *opts = NULL;
+ QDict *qdict = NULL;
int res = -EINVAL, lno = 0;
int count = 0;
loc_push_none(&loc);
while (fgets(line, sizeof(line), fp) != NULL) {
- loc_set_file(fname, ++lno);
+ ++lno;
if (line[0] == '\n') {
/* skip empty lines */
continue;
@@ -372,39 +373,39 @@ int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname, Error *
/* comment */
continue;
}
- if (sscanf(line, "[%63s \"%63[^\"]\"]", group, id) == 2) {
- /* group with id */
- list = find_list(lists, group, &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
- goto out;
+ if (line[0] == '[') {
+ QDict *prev = qdict;
+ if (sscanf(line, "[%63s \"%63[^\"]\"]", group, value) == 2) {
+ qdict = qdict_new();
+ qdict_put_str(qdict, "id", value);
+ count++;
+ } else if (sscanf(line, "[%63[^]]]", group) == 1) {
+ qdict = qdict_new();
+ count++;
}
- opts = qemu_opts_create(list, id, 1, NULL);
- count++;
- continue;
- }
- if (sscanf(line, "[%63[^]]]", group) == 1) {
- /* group without id */
- list = find_list(lists, group, &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
- goto out;
+ if (qdict != prev) {
+ if (prev) {
+ cb(prev_group, prev, opaque, &local_err);
+ qobject_unref(prev);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ goto out;
+ }
+ }
+ strcpy(prev_group, group);
+ continue;
}
- opts = qemu_opts_create(list, NULL, 0, &error_abort);
- count++;
- continue;
}
+ loc_set_file(fname, lno);
value[0] = '\0';
if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2 ||
sscanf(line, " %63s = \"\"", arg) == 1) {
/* arg = value */
- if (opts == NULL) {
+ if (qdict == NULL) {
error_setg(errp, "no group defined");
goto out;
}
- if (!qemu_opt_set(opts, arg, value, errp)) {
- goto out;
- }
+ qdict_put_str(qdict, arg, value);
continue;
}
error_setg(errp, "parse error");
@@ -417,11 +418,48 @@ int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname, Error *
}
res = count;
out:
+ if (qdict) {
+ cb(group, qdict, opaque, errp);
+ qobject_unref(qdict);
+ }
loc_pop(&loc);
return res;
}
-int qemu_read_config_file(const char *filename, Error **errp)
+void qemu_config_do_parse(const char *group, QDict *qdict, void *opaque, Error **errp)
+{
+ QemuOptsList **lists = opaque;
+ const char *id = qdict_get_try_str(qdict, "id");
+ QemuOptsList *list;
+ QemuOpts *opts;
+ const QDictEntry *unrecognized;
+
+ list = find_list(lists, group, errp);
+ if (!list) {
+ return;
+ }
+
+ opts = qemu_opts_create(list, id, 1, errp);
+ if (!opts) {
+ return;
+ }
+ qemu_opts_absorb_qdict(opts, qdict, errp);
+ if (errp) {
+ return;
+ }
+ unrecognized = qdict_first(qdict);
+ if (unrecognized) {
+ error_setg(errp, QERR_INVALID_PARAMETER, unrecognized->key);
+ qemu_opts_del(opts);
+ }
+}
+
+int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname, Error **errp)
+{
+ return qemu_config_foreach(fp, qemu_config_do_parse, lists, fname, errp);
+}
+
+int qemu_read_config_file(const char *filename, QEMUConfigCB *cb, Error **errp)
{
FILE *f = fopen(filename, "r");
int ret;
@@ -431,7 +469,7 @@ int qemu_read_config_file(const char *filename, Error **errp)
return -errno;
}
- ret = qemu_config_parse(f, vm_config_groups, filename, errp);
+ ret = qemu_config_foreach(f, cb, vm_config_groups, filename, errp);
fclose(f);
return ret;
}
--
2.27.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v3 2/3] vl: plumb keyval-based options into -readconfig
2021-05-21 10:21 [PATCH v3 0/3] vl: add -object support back into -readconfig Paolo Bonzini
2021-05-21 10:21 ` [PATCH v3 1/3] qemu-config: parse configuration files to a QDict Paolo Bonzini
@ 2021-05-21 10:21 ` Paolo Bonzini
2021-05-21 10:21 ` [PATCH v3 3/3] vl: plug -object back " Paolo Bonzini
2 siblings, 0 replies; 6+ messages in thread
From: Paolo Bonzini @ 2021-05-21 10:21 UTC (permalink / raw)
To: qemu-devel; +Cc: kwolf, armbru, qemu-stable
Let -readconfig support parsing command line options into QDict or
QemuOpts. This will be used to add back support for objects in
-readconfig.
Cc: Markus Armbruster <armbru@redhat.com>
Cc: qemu-stable@nongnu.org
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
v1->v2: fix overlong line
include/block/qdict.h | 2 -
include/qapi/qmp/qdict.h | 3 ++
softmmu/vl.c | 83 ++++++++++++++++++++++++++++------------
3 files changed, 62 insertions(+), 26 deletions(-)
diff --git a/include/block/qdict.h b/include/block/qdict.h
index d8cb502d7d..ced2acfb92 100644
--- a/include/block/qdict.h
+++ b/include/block/qdict.h
@@ -20,8 +20,6 @@ void qdict_join(QDict *dest, QDict *src, bool overwrite);
void qdict_extract_subqdict(QDict *src, QDict **dst, const char *start);
void qdict_array_split(QDict *src, QList **dst);
int qdict_array_entries(QDict *src, const char *subqdict);
-QObject *qdict_crumple(const QDict *src, Error **errp);
-void qdict_flatten(QDict *qdict);
typedef struct QDictRenames {
const char *from;
diff --git a/include/qapi/qmp/qdict.h b/include/qapi/qmp/qdict.h
index 9934539c1b..d5b5430e21 100644
--- a/include/qapi/qmp/qdict.h
+++ b/include/qapi/qmp/qdict.h
@@ -64,4 +64,7 @@ const char *qdict_get_try_str(const QDict *qdict, const char *key);
QDict *qdict_clone_shallow(const QDict *src);
+QObject *qdict_crumple(const QDict *src, Error **errp);
+void qdict_flatten(QDict *qdict);
+
#endif /* QDICT_H */
diff --git a/softmmu/vl.c b/softmmu/vl.c
index 47dfdd704f..5e8240b9d8 100644
--- a/softmmu/vl.c
+++ b/softmmu/vl.c
@@ -121,6 +121,7 @@
#include "qapi/qapi-commands-misc.h"
#include "qapi/qapi-visit-qom.h"
#include "qapi/qapi-commands-ui.h"
+#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qerror.h"
#include "sysemu/iothread.h"
#include "qemu/guest-random.h"
@@ -2127,13 +2128,53 @@ static int global_init_func(void *opaque, QemuOpts *opts, Error **errp)
return 0;
}
+/*
+ * Return whether configuration group @group is stored in QemuOpts, or
+ * recorded as one or more QDicts by qemu_record_config_group.
+ */
+static bool is_qemuopts_group(const char *group)
+{
+ return true;
+}
+
+static void qemu_record_config_group(const char *group, QDict *dict,
+ bool from_json, Error **errp)
+{
+ abort();
+}
+
+/*
+ * Parse non-QemuOpts config file groups, pass the rest to
+ * qemu_config_do_parse.
+ */
+static void qemu_parse_config_group(const char *group, QDict *qdict,
+ void *opaque, Error **errp)
+{
+ QObject *crumpled;
+ if (is_qemuopts_group(group)) {
+ qemu_config_do_parse(group, qdict, opaque, errp);
+ return;
+ }
+
+ crumpled = qdict_crumple(qdict, errp);
+ if (!crumpled) {
+ return;
+ }
+ if (qobject_type(crumpled) != QTYPE_QDICT) {
+ assert(qobject_type(crumpled) == QTYPE_QLIST);
+ error_setg(errp, "Lists cannot be at top level of a configuration section");
+ return;
+ }
+ qemu_record_config_group(group, qobject_to(QDict, crumpled), false, errp);
+}
+
static void qemu_read_default_config_file(Error **errp)
{
ERRP_GUARD();
int ret;
g_autofree char *file = get_relocated_path(CONFIG_QEMU_CONFDIR "/qemu.conf");
- ret = qemu_read_config_file(file, qemu_config_do_parse, errp);
+ ret = qemu_read_config_file(file, qemu_parse_config_group, errp);
if (ret < 0) {
if (ret == -ENOENT) {
error_free(*errp);
@@ -2142,9 +2183,8 @@ static void qemu_read_default_config_file(Error **errp)
}
}
-static int qemu_set_option(const char *str)
+static void qemu_set_option(const char *str, Error **errp)
{
- Error *local_err = NULL;
char group[64], id[64], arg[64];
QemuOptsList *list;
QemuOpts *opts;
@@ -2152,27 +2192,23 @@ static int qemu_set_option(const char *str)
rc = sscanf(str, "%63[^.].%63[^.].%63[^=]%n", group, id, arg, &offset);
if (rc < 3 || str[offset] != '=') {
- error_report("can't parse: \"%s\"", str);
- return -1;
- }
-
- list = qemu_find_opts(group);
- if (list == NULL) {
- return -1;
- }
-
- opts = qemu_opts_find(list, id);
- if (!opts) {
- error_report("there is no %s \"%s\" defined",
- list->name, id);
- return -1;
+ error_setg(errp, "can't parse: \"%s\"", str);
+ return;
}
- if (!qemu_opt_set(opts, arg, str + offset + 1, &local_err)) {
- error_report_err(local_err);
- return -1;
+ if (!is_qemuopts_group(group)) {
+ error_setg(errp, "-set is not supported with %s", group);
+ } else {
+ list = qemu_find_opts_err(group, errp);
+ if (list) {
+ opts = qemu_opts_find(list, id);
+ if (!opts) {
+ error_setg(errp, "there is no %s \"%s\" defined", group, id);
+ return;
+ }
+ qemu_opt_set(opts, arg, str + offset + 1, errp);
+ }
}
- return 0;
}
static void user_register_global_props(void)
@@ -2766,8 +2802,7 @@ void qemu_init(int argc, char **argv, char **envp)
}
break;
case QEMU_OPTION_set:
- if (qemu_set_option(optarg) != 0)
- exit(1);
+ qemu_set_option(optarg, &error_fatal);
break;
case QEMU_OPTION_global:
if (qemu_global_option(optarg) != 0)
@@ -3399,7 +3434,7 @@ void qemu_init(int argc, char **argv, char **envp)
qemu_plugin_opt_parse(optarg, &plugin_list);
break;
case QEMU_OPTION_readconfig:
- qemu_read_config_file(optarg, qemu_config_do_parse, &error_fatal);
+ qemu_read_config_file(optarg, qemu_parse_config_group, &error_fatal);
break;
case QEMU_OPTION_spice:
olist = qemu_find_opts_err("spice", NULL);
--
2.27.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v3 3/3] vl: plug -object back into -readconfig
2021-05-21 10:21 [PATCH v3 0/3] vl: add -object support back into -readconfig Paolo Bonzini
2021-05-21 10:21 ` [PATCH v3 1/3] qemu-config: parse configuration files to a QDict Paolo Bonzini
2021-05-21 10:21 ` [PATCH v3 2/3] vl: plumb keyval-based options into -readconfig Paolo Bonzini
@ 2021-05-21 10:21 ` Paolo Bonzini
2 siblings, 0 replies; 6+ messages in thread
From: Paolo Bonzini @ 2021-05-21 10:21 UTC (permalink / raw)
To: qemu-devel; +Cc: kwolf, armbru, qemu-stable
Commit bc2f4fcb1d ("qom: move user_creatable_add_opts logic to vl.c
and QAPIfy it", 2021-03-19) switched the creation of objects from
qemu_opts_foreach to a bespoke QTAILQ in preparation for supporting JSON
syntax in -object.
Unfortunately in doing so it lost support for [object] stanzas in
configuration files and also for "-set object.ID.KEY=VAL". The latter
is hard to re-establish and probably best solved by deprecating -set.
This patch uses the infrastructure introduced by the previous two
patches in order to parse QOM objects correctly from configuration
files.
Cc: Markus Armbruster <armbru@redhat.com>
Cc: qemu-stable@nongnu.org
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
softmmu/vl.c | 24 ++++++++++++++++++------
1 file changed, 18 insertions(+), 6 deletions(-)
diff --git a/softmmu/vl.c b/softmmu/vl.c
index 5e8240b9d8..326c1e9080 100644
--- a/softmmu/vl.c
+++ b/softmmu/vl.c
@@ -1722,9 +1722,15 @@ static void object_option_foreach_add(bool (*type_opt_predicate)(const char *))
}
}
+static void object_option_add_visitor(Visitor *v)
+{
+ ObjectOption *opt = g_new0(ObjectOption, 1);
+ visit_type_ObjectOptions(v, NULL, &opt->opts, &error_fatal);
+ QTAILQ_INSERT_TAIL(&object_opts, opt, next);
+}
+
static void object_option_parse(const char *optarg)
{
- ObjectOption *opt;
QemuOpts *opts;
const char *type;
Visitor *v;
@@ -1752,11 +1758,8 @@ static void object_option_parse(const char *optarg)
v = opts_visitor_new(opts);
}
- opt = g_new0(ObjectOption, 1);
- visit_type_ObjectOptions(v, NULL, &opt->opts, &error_fatal);
+ object_option_add_visitor(v);
visit_free(v);
-
- QTAILQ_INSERT_TAIL(&object_opts, opt, next);
}
/*
@@ -2134,13 +2137,22 @@ static int global_init_func(void *opaque, QemuOpts *opts, Error **errp)
*/
static bool is_qemuopts_group(const char *group)
{
+ if (g_str_equal(group, "object")) {
+ return false;
+ }
return true;
}
static void qemu_record_config_group(const char *group, QDict *dict,
bool from_json, Error **errp)
{
- abort();
+ if (g_str_equal(group, "object")) {
+ Visitor *v = qobject_input_visitor_new_keyval(QOBJECT(dict));
+ object_option_add_visitor(v);
+ visit_free(v);
+ } else {
+ abort();
+ }
}
/*
--
2.27.0
^ permalink raw reply related [flat|nested] 6+ messages in thread