add a boot option to do strict boot

Seabios already added a new device type to halt booting.
Qemu can add "HALT" at the end of bootindex string, then
seabios will halt booting after trying to boot from all
selected devices.

This patch added a new boot option to configure if boot
from un-selected devices.

This option only effects when boot priority is changed by
bootindex options, the old style(-boot order=..) will still
try to boot from un-selected devices.

v2: add HALT entry in get_boot_devices_list()
v3: rebase to latest qemu upstream

Signed-off-by: Amos Kong <akong@redhat.com>
Message-id: 1363674207-31496-1-git-send-email-akong@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 24 insertions, 1 deletions

diff --git a/vl.c b/vl.c
index ce51e65368..aeed7f435d 100644
--- a/vl.c
+++ b/vl.c
@@ -234,6 +234,7 @@ int ctrl_grab = 0;
 unsigned int nb_prom_envs = 0;
 const char *prom_envs[MAX_PROM_ENVS];
 int boot_menu;
+bool boot_strict;
 uint8_t *boot_splash_filedata;
 size_t boot_splash_filedata_size;
 uint8_t qemu_extra_params_fw[2];
@@ -458,6 +459,9 @@ static QemuOptsList qemu_boot_opts = {
         }, {
             .name = "reboot-timeout",
             .type = QEMU_OPT_STRING,
+        }, {
+            .name = "strict",
+            .type = QEMU_OPT_STRING,
         },
         { /*End of list */ }
     },
@@ -1267,6 +1271,12 @@ char *get_boot_devices_list(size_t *size)
 
     *size = total;
 
+    if (boot_strict && *size > 0) {
+        list[total-1] = '\n';
+        list = g_realloc(list, total + 4);
+        memcpy(&list[total], "HALT", 4);
+        *size = total + 4;
+    }
     return list;
 }
 
@@ -3131,7 +3141,7 @@ int main(int argc, char **argv, char **envp)
                     static const char * const params[] = {
                         "order", "once", "menu",
                         "splash", "splash-time",
-                        "reboot-timeout", NULL
+                        "reboot-timeout", "strict", NULL
                     };
                     char buf[sizeof(boot_devices)];
                     char *standard_boot_devices;
@@ -3174,6 +3184,19 @@ int main(int argc, char **argv, char **envp)
                                 exit(1);
                             }
                         }
+                        if (get_param_value(buf, sizeof(buf),
+                                            "strict", optarg)) {
+                            if (!strcmp(buf, "on")) {
+                                boot_strict = true;
+                            } else if (!strcmp(buf, "off")) {
+                                boot_strict = false;
+                            } else {
+                                fprintf(stderr,
+                                        "qemu: invalid option value '%s'\n",
+                                        buf);
+                                exit(1);
+                            }
+                        }
                         if (!qemu_opts_parse(qemu_find_opts("boot-opts"),
                                              optarg, 0)) {
                             exit(1);