Commit ac05f349 authored by Amos Kong's avatar Amos Kong Committed by Anthony Liguori
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add a boot parameter to set reboot timeout

Added an option to let qemu transfer a configuration file to bios,
"etc/boot-fail-wait", which could be specified by command
    -boot reboot-timeout=T
T have a max value of 0xffff, unit is ms.

With this option, guest will wait for a given time if not find
bootabled device, then reboot. If reboot-timeout is '-1', guest
will not reboot, qemu passes '-1' to bios by default.

This feature need the new seabios's support.

Seabios pulls the value from the fwcfg "file" interface, this
interface is used because SeaBIOS needs a reliable way of
obtaining a name, value size, and value. It in no way requires
that there be a real file on the user's host machine.
Signed-off-by: default avatarAmos Kong <>
Signed-off-by: default avatarAnthony Liguori <>
parent 3202beca
......@@ -183,6 +183,30 @@ static void fw_cfg_bootsplash(FWCfgState *s)
static void fw_cfg_reboot(FWCfgState *s)
int reboot_timeout = -1;
char *p;
const char *temp;
/* get user configuration */
QemuOptsList *plist = qemu_find_opts("boot-opts");
QemuOpts *opts = QTAILQ_FIRST(&plist->head);
if (opts != NULL) {
temp = qemu_opt_get(opts, "reboot-timeout");
if (temp != NULL) {
p = (char *)temp;
reboot_timeout = strtol(p, (char **)&p, 10);
/* validate the input */
if (reboot_timeout > 0xffff) {
error_report("reboot timeout is larger than 65535, force it to 65535.");
reboot_timeout = 0xffff;
fw_cfg_add_file(s, "etc/boot-fail-wait", g_memdup(&reboot_timeout, 4), 4);
static void fw_cfg_write(FWCfgState *s, uint8_t value)
int arch = !!(s->cur_entry & FW_CFG_ARCH_LOCAL);
......@@ -497,6 +521,7 @@ FWCfgState *fw_cfg_init(uint32_t ctl_port, uint32_t data_port,
fw_cfg_add_i16(s, FW_CFG_MAX_CPUS, (uint16_t)max_cpus);
fw_cfg_add_i16(s, FW_CFG_BOOT_MENU, (uint16_t)boot_menu);
s->machine_ready.notify = fw_cfg_machine_ready;
......@@ -645,6 +645,9 @@ QemuOptsList qemu_boot_opts = {
}, {
.name = "splash-time",
}, {
.name = "reboot-timeout",
{ /*End of list */ }
......@@ -344,13 +344,14 @@ ETEXI
DEF("boot", HAS_ARG, QEMU_OPTION_boot,
"-boot [order=drives][,once=drives][,menu=on|off]\n"
" [,splash=sp_name][,splash-time=sp_time]\n"
" [,splash=sp_name][,splash-time=sp_time][,reboot-timeout=rb_time]\n"
" 'drives': floppy (a), hard disk (c), CD-ROM (d), network (n)\n"
" 'sp_name': the file's name that would be passed to bios as logo picture, if menu=on\n"
" 'sp_time': the period that splash picture last if menu=on, unit is ms\n",
" 'sp_time': the period that splash picture last if menu=on, unit is ms\n"
" 'rb_timeout': the timeout before guest reboot when boot failed, unit is ms\n",
@item -boot [order=@var{drives}][,once=@var{drives}][,menu=on|off][,splash=@var{sp_name}][,splash-time=@var{sp_time}]
@item -boot [order=@var{drives}][,once=@var{drives}][,menu=on|off][,splash=@var{sp_name}][,splash-time=@var{sp_time}][,reboot-timeout=@var{rb_timeout}]
@findex -boot
Specify boot order @var{drives} as a string of drive letters. Valid
drive letters depend on the target achitecture. The x86 PC uses: a, b
......@@ -369,6 +370,11 @@ limitation: The splash file could be a jpeg file or a BMP file in 24 BPP
format(true color). The resolution should be supported by the SVGA mode, so
the recommended is 320x240, 640x480, 800x640.
A timeout could be passed to bios, guest will pause for @var{rb_timeout} ms
when boot failed, then reboot. If @var{rb_timeout} is '-1', guest will not
reboot, qemu passes '-1' to bios by default. Currently Seabios for X86
system support it.
# try to boot from network first, then from hard disk
qemu-system-i386 -boot order=nc
......@@ -2632,7 +2632,8 @@ int main(int argc, char **argv, char **envp)
static const char * const params[] = {
"order", "once", "menu",
"splash", "splash-time", NULL
"splash", "splash-time",
"reboot-timeout", NULL
char buf[sizeof(boot_devices)];
char *standard_boot_devices;
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