Re: [Qemu-devel] [PATCH v2] add a boot parameter to set reboot timeout

[Gleb Natapov <gleb@redhat.com>]

On Thu, Sep 20, 2012 at 11:15:26AM +0800, Amos Kong wrote:
> On 07/09/12 11:11, Amos Kong wrote:
> >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: Amos Kong <akong@redhat.com>
> >---
> >v2: qemu passes '-1' to bios, guest will not reboot
> 
> 
> Gleb, Anthony, any comments?
> 
Not from me. Looks good.

> >---
> >  hw/fw_cfg.c     |   25 +++++++++++++++++++++++++
> >  qemu-config.c   |    3 +++
> >  qemu-options.hx |   12 +++++++++---
> >  vl.c            |    3 ++-
> >  4 files changed, 39 insertions(+), 4 deletions(-)
> >
> >diff --git a/hw/fw_cfg.c b/hw/fw_cfg.c
> >index 7b3b576..dcde1a9 100644
> >--- a/hw/fw_cfg.c
> >+++ b/hw/fw_cfg.c
> >@@ -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);
> >      fw_cfg_bootsplash(s);
> >+    fw_cfg_reboot(s);
> >
> >      s->machine_ready.notify = fw_cfg_machine_ready;
> >      qemu_add_machine_init_done_notifier(&s->machine_ready);
> >diff --git a/qemu-config.c b/qemu-config.c
> >index c05ffbc..b9f9e0f 100644
> >--- a/qemu-config.c
> >+++ b/qemu-config.c
> >@@ -638,6 +638,9 @@ QemuOptsList qemu_boot_opts = {
> >          }, {
> >              .name = "splash-time",
> >              .type = QEMU_OPT_STRING,
> >+        }, {
> >+            .name = "reboot-timeout",
> >+            .type = QEMU_OPT_STRING,
> >          },
> >          { /*End of list */ }
> >      },
> >diff --git a/qemu-options.hx b/qemu-options.hx
> >index 3c411c4..0249a60 100644
> >--- a/qemu-options.hx
> >+++ b/qemu-options.hx
> >@@ -339,13 +339,14 @@ 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",
> >      QEMU_ARCH_ALL)
> >  STEXI
> >-@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
> >@@ -364,6 +365,11 @@ 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.
> >+
> >  @example
> >  # try to boot from network first, then from hard disk
> >  qemu-system-i386 -boot order=nc
> >diff --git a/vl.c b/vl.c
> >index 7c577fa..1bd9931 100644
> >--- a/vl.c
> >+++ b/vl.c
> >@@ -2622,7 +2622,8 @@ 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;
> >
> 
> -- 
> 			Amos.

--
			Gleb.