smbios: Make multiple -smbios type= accumulate sanely

Currently, -smbios type=T,NAME=VAL,... adds one field (T,NAME) with
value VAL to fw_cfg for each unique NAME.  If NAME occurs multiple
times, the last one's VAL is used (before the QemuOpts conversion, the
first one was used).

Multiple -smbios can add multiple fields with the same (T, NAME).
SeaBIOS reads all of them from fw_cfg, but uses only the first field
(T, NAME).  The others are ignored.

"First one wins, subsequent ones get ignored silently" isn't nice.  We
commonly let the last option win.  Useful, because it lets you
-readconfig first, then selectively override with command line
options.

Clean up -smbios to work the common way.  Accumulate the settings,
with later ones overwriting earlier ones.  Put the result into fw_cfg
(no more useless duplicates).

Bonus cleanup: qemu_uuid_parse() no longer sets SMBIOS system uuid by
side effect.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 91 insertions, 61 deletions

diff --git a/hw/i386/smbios.c b/hw/i386/smbios.c
index 42635513b8..d2dba6c72e 100644
--- a/hw/i386/smbios.c
+++ b/hw/i386/smbios.c
@@ -47,6 +47,7 @@ struct smbios_table {
 static uint8_t *smbios_entries;
 static size_t smbios_entries_len;
 static int smbios_type4_count = 0;
+static bool smbios_immutable;
 
 static struct {
     bool seen;
@@ -54,6 +55,17 @@ static struct {
     Location loc;
 } first_opt[2];
 
+static struct {
+    const char *vendor, *version, *date;
+    bool have_major_minor;
+    uint8_t major, minor;
+} type0;
+
+static struct {
+    const char *manufacturer, *product, *version, *serial, *sku, *family;
+    /* uuid is in qemu_uuid[] */
+} type1;
+
 static QemuOptsList qemu_smbios_opts = {
     .name = "smbios",
     .head = QTAILQ_HEAD_INITIALIZER(qemu_smbios_opts.head),
@@ -152,13 +164,6 @@ static void smbios_validate_table(void)
     }
 }
 
-uint8_t *smbios_get_table(size_t *length)
-{
-    smbios_validate_table();
-    *length = smbios_entries_len;
-    return smbios_entries;
-}
-
 /*
  * To avoid unresolvable overlaps in data, don't allow both
  * tables and fields for the same smbios type.
@@ -182,12 +187,10 @@ static void smbios_check_collision(int type, int entry)
     }
 }
 
-void smbios_add_field(int type, int offset, const void *data, size_t len)
+static void smbios_add_field(int type, int offset, const void *data, size_t len)
 {
     struct smbios_field *field;
 
-    smbios_check_collision(type, SMBIOS_FIELD_ENTRY);
-
     if (!smbios_entries) {
         smbios_entries_len = sizeof(uint16_t);
         smbios_entries = g_malloc0(smbios_entries_len);
@@ -207,82 +210,81 @@ void smbios_add_field(int type, int offset, const void *data, size_t len)
             cpu_to_le16(le16_to_cpu(*(uint16_t *)smbios_entries) + 1);
 }
 
-static void smbios_build_type_0_fields(QemuOpts *opts)
+static void smbios_build_type_0_fields(void)
 {
-    const char *val;
-    unsigned char major, minor;
-
-    val = qemu_opt_get(opts, "vendor");
-    if (val) {
+    if (type0.vendor) {
         smbios_add_field(0, offsetof(struct smbios_type_0, vendor_str),
-                         val, strlen(val) + 1);
+                         type0.vendor, strlen(type0.vendor) + 1);
     }
-    val = qemu_opt_get(opts, "version");
-    if (val) {
+    if (type0.version) {
         smbios_add_field(0, offsetof(struct smbios_type_0, bios_version_str),
-                         val, strlen(val) + 1);
+                         type0.version, strlen(type0.version) + 1);
     }
-    val = qemu_opt_get(opts, "date");
-    if (val) {
+    if (type0.date) {
         smbios_add_field(0, offsetof(struct smbios_type_0,
                                      bios_release_date_str),
-                         val, strlen(val) + 1);
+                         type0.date, strlen(type0.date) + 1);
     }
-    val = qemu_opt_get(opts, "release");
-    if (val) {
-        if (sscanf(val, "%hhu.%hhu", &major, &minor) != 2) {
-            error_report("Invalid release");
-            exit(1);
-        }
+    if (type0.have_major_minor) {
         smbios_add_field(0, offsetof(struct smbios_type_0,
                                      system_bios_major_release),
-                         &major, 1);
+                         &type0.major, 1);
         smbios_add_field(0, offsetof(struct smbios_type_0,
                                      system_bios_minor_release),
-                         &minor, 1);
+                         &type0.minor, 1);
     }
 }
 
-static void smbios_build_type_1_fields(QemuOpts *opts)
+static void smbios_build_type_1_fields(void)
 {
-    const char *val;
-
-    val = qemu_opt_get(opts, "manufacturer");
-    if (val) {
+    if (type1.manufacturer) {
         smbios_add_field(1, offsetof(struct smbios_type_1, manufacturer_str),
-                         val, strlen(val) + 1);
+                         type1.manufacturer, strlen(type1.manufacturer) + 1);
     }
-    val = qemu_opt_get(opts, "product");
-    if (val) {
+    if (type1.product) {
         smbios_add_field(1, offsetof(struct smbios_type_1, product_name_str),
-                         val, strlen(val) + 1);
+                         type1.product, strlen(type1.product) + 1);
     }
-    val = qemu_opt_get(opts, "version");
-    if (val) {
+    if (type1.version) {
         smbios_add_field(1, offsetof(struct smbios_type_1, version_str),
-                         val, strlen(val) + 1);
+                         type1.version, strlen(type1.version) + 1);
     }
-    val = qemu_opt_get(opts, "serial");
-    if (val) {
+    if (type1.serial) {
         smbios_add_field(1, offsetof(struct smbios_type_1, serial_number_str),
-                         val, strlen(val) + 1);
-    }
-    val = qemu_opt_get(opts, "uuid");
-    if (val) {
-        if (qemu_uuid_parse(val, qemu_uuid) != 0) {
-            error_report("Invalid UUID");
-            exit(1);
-        }
+                         type1.serial, strlen(type1.serial) + 1);
     }
-    val = qemu_opt_get(opts, "sku");
-    if (val) {
+    if (type1.sku) {
         smbios_add_field(1, offsetof(struct smbios_type_1, sku_number_str),
-                         val, strlen(val) + 1);
+                         type1.sku, strlen(type1.sku) + 1);
     }
-    val = qemu_opt_get(opts, "family");
-    if (val) {
+    if (type1.family) {
         smbios_add_field(1, offsetof(struct smbios_type_1, family_str),
-                         val, strlen(val) + 1);
+                         type1.family, strlen(type1.family) + 1);
+    }
+    if (qemu_uuid_set) {
+        smbios_add_field(1, offsetof(struct smbios_type_1, uuid),
+                         qemu_uuid, 16);
+    }
+}
+
+uint8_t *smbios_get_table(size_t *length)
+{
+    if (!smbios_immutable) {
+        smbios_build_type_0_fields();
+        smbios_build_type_1_fields();
+        smbios_validate_table();
+        smbios_immutable = true;
+    }
+    *length = smbios_entries_len;
+    return smbios_entries;
+}
+
+static void save_opt(const char **dest, QemuOpts *opts, const char *name)
+{
+    const char *val = qemu_opt_get(opts, name);
+
+    if (val) {
+        *dest = val;
     }
 }
 
@@ -291,6 +293,7 @@ void smbios_entry_add(QemuOpts *opts)
     Error *local_err = NULL;
     const char *val;
 
+    assert(!smbios_immutable);
     val = qemu_opt_get(opts, "file");
     if (val) {
         struct smbios_structure_header *header;
@@ -341,6 +344,8 @@ void smbios_entry_add(QemuOpts *opts)
     if (val) {
         unsigned long type = strtoul(val, NULL, 0);
 
+        smbios_check_collision(type, SMBIOS_FIELD_ENTRY);
+
         switch (type) {
         case 0:
             qemu_opts_validate(opts, qemu_smbios_type0_opts, &local_err);
@@ -348,7 +353,18 @@ void smbios_entry_add(QemuOpts *opts)
                 error_report("%s", error_get_pretty(local_err));
                 exit(1);
             }
-            smbios_build_type_0_fields(opts);
+            save_opt(&type0.vendor, opts, "vendor");
+            save_opt(&type0.version, opts, "version");
+            save_opt(&type0.date, opts, "date");
+
+            val = qemu_opt_get(opts, "release");
+            if (val) {
+                if (sscanf(val, "%hhu.%hhu", &type0.major, &type0.minor) != 2) {
+                    error_report("Invalid release");
+                    exit(1);
+                }
+                type0.have_major_minor = true;
+            }
             return;
         case 1:
             qemu_opts_validate(opts, qemu_smbios_type1_opts, &local_err);
@@ -356,7 +372,21 @@ void smbios_entry_add(QemuOpts *opts)
                 error_report("%s", error_get_pretty(local_err));
                 exit(1);
             }
-            smbios_build_type_1_fields(opts);
+            save_opt(&type1.manufacturer, opts, "manufacturer");
+            save_opt(&type1.product, opts, "product");
+            save_opt(&type1.version, opts, "version");
+            save_opt(&type1.serial, opts, "serial");
+            save_opt(&type1.sku, opts, "sku");
+            save_opt(&type1.family, opts, "family");
+
+            val = qemu_opt_get(opts, "uuid");
+            if (val) {
+                if (qemu_uuid_parse(val, qemu_uuid) != 0) {
+                    error_report("Invalid UUID");
+                    exit(1);
+                }
+                qemu_uuid_set = true;
+            }
             return;
         default:
             error_report("Don't know how to build fields for SMBIOS type %ld",