Re: [libvirt] [Qemu-devel] [Qemu PATCH v2] add a boot option to do strict boot

On Wed, Jan 09, 2013 at 08:14:07AM -0700, Eric Blake wrote: > On 01/09/2013 01:39 AM, Amos Kong wrote: >> Current seabios will try to boot from selected devices first, >> if they are all failed, seabios will also try to boot from >> un-selected devices. >> >> We need to make it configurable. I already posted a seabios >> patch to add 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 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() >> define boot_strict to bool >> >> Signed-off-by: Amos Kong <akong(a)redhat.com&gt; >> --- > Libvirt will need to expose an attribute that lets the user control > whether to use this new option; how do we probe via QMP whether the new > -boot strict=on command-line option is available? Old style to adjust boot priority by order parameter: -boot order=n,strict=on (BAD, unselected devices will be tried) New style to adjust boot priority by bootindex: -device virtio-net-pci,...,bootindex=1 -boot strict=on (OK) We only want strict option to support new style. (those two styles are implemented in two different way insider seabios, the latest simple patch only changed the bootindex way)