From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?iso-8859-1?Q?Volker_R=FCmelin?= <volker.ruemelin@t-online.de>
Subject: [PATCH] boot=on option is missing in qemu-options.hx. Libvirt needs this information.
Date: Tue, 7 Apr 2009 23:22:47 +0200
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Libvirt parses qemu-kvm -help output for boot=on. Without this it's not possible to boot from a virtio block device.

--- kvm-85rc3/qemu/qemu-options.hx.org
+++ kvm-85rc3/qemu/qemu-options.hx
@@ -77,6 +77,7 @@
     "-drive [file=file][,if=type][,bus=n][,unit=m][,media=d][,index=i]\n"
     "       [,cyls=c,heads=h,secs=s[,trans=t]][,snapshot=on|off]\n"
     "       [,cache=writethrough|writeback|none][,format=f][,serial=s]\n"
+    "       [,boot=on|off]\n"
     "                use 'file' as a drive image\n")
 STEXI
 @item -drive @var{option}[,@var{option}[,@var{option}[,...]]]
@@ -111,6 +112,9 @@
 an untrusted format header.
 @item serial=@var{serial}
 This option specifies the serial number to assign to the device.
+@item boot=@var{boot}
+@var{boot} if "on" enables extboot for a given drive so it can be used 
+as a boot drive.
 @end table

 By default, writethrough caching is used for all block device.  This means that
@@ -163,6 +167,11 @@
 qemu -drive file=file,if=scsi,bus=0,unit=6
 @end example

+To boot from as SCSI disk, one would use:
+@example
+qemu -drive file=file,if=scsi,boot=on
+@end example
+
 Instead of @option{-fda}, @option{-fdb}, you can use:
 @example
 qemu -drive file=file,index=0,if=floppy