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softmmu/vl: Let -fw_cfg option take a 'gen_id' argument

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The 'gen_id' argument refers to a QOM object able to produce
data consumable by the fw_cfg device. The producer object must
implement the FW_CFG_DATA_GENERATOR interface.

Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20200623172726.21040-4-philmd@redhat.com>
This commit is contained in:
Philippe Mathieu-Daudé 2020-05-19 19:20:43 +02:00
parent 3203148917
commit 6552d87c48
1 changed files with 21 additions and 8 deletions
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29
softmmu/vl.c
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@ -489,6 +489,11 @@ static QemuOptsList qemu_fw_cfg_opts = {
.name = "string",
.type = QEMU_OPT_STRING,
.help = "Sets content of the blob to be inserted from a string",
}, {
.name = "gen_id",
.type = QEMU_OPT_STRING,
.help = "Sets id of the object generating the fw_cfg blob "
"to be inserted",
},
{ /* end of list */ }
},
@ -2020,7 +2025,7 @@ static int parse_fw_cfg(void *opaque, QemuOpts *opts, Error **errp)
{
gchar *buf;
size_t size;
const char *name, *file, *str;
const char *name, *file, *str, *gen_id;
FWCfgState *fw_cfg = (FWCfgState *) opaque;
if (fw_cfg == NULL) {
@ -2030,14 +2035,13 @@ static int parse_fw_cfg(void *opaque, QemuOpts *opts, Error **errp)
name = qemu_opt_get(opts, "name");
file = qemu_opt_get(opts, "file");
str = qemu_opt_get(opts, "string");
gen_id = qemu_opt_get(opts, "gen_id");
/* we need name and either a file or the content string */
if (!(nonempty_str(name) && (nonempty_str(file) || nonempty_str(str)))) {
error_setg(errp, "invalid argument(s)");
return -1;
}
if (nonempty_str(file) && nonempty_str(str)) {
error_setg(errp, "file and string are mutually exclusive");
/* we need the name, and exactly one of: file, content string, gen_id */
if (!nonempty_str(name) ||
nonempty_str(file) + nonempty_str(str) + nonempty_str(gen_id) != 1) {
error_setg(errp, "name, plus exactly one of file,"
" string and gen_id, are needed");
return -1;
}
if (strlen(name) > FW_CFG_MAX_FILE_PATH - 1) {
@ -2052,6 +2056,15 @@ static int parse_fw_cfg(void *opaque, QemuOpts *opts, Error **errp)
if (nonempty_str(str)) {
size = strlen(str); /* NUL terminator NOT included in fw_cfg blob */
buf = g_memdup(str, size);
} else if (nonempty_str(gen_id)) {
Error *local_err = NULL;
fw_cfg_add_from_generator(fw_cfg, name, gen_id, errp);
if (local_err) {
error_propagate(errp, local_err);
return -1;
}
return 0;
} else {
GError *err = NULL;
if (!g_file_get_contents(file, &buf, &size, &err)) {