[OE-core] qemu needs target kernel sets CONFIG_SCSI_VIRTIO=y to boot vmdk qcow2 and vdi

[Robert Yang]

Hi Bruce and Darren,

We need enable target kernel's CONFIG_SCSI_VIRTIO=y to make native qemu
can boot hdddirect, vmdk, qcow2 and vdi, otherwise, the scsi drive can't
work in qemu since our vm image's root default to /dev/sda2, or we can
change it default to /dev/hda2, then we don't have to make any changes
on kernel, but I prefer scsi since ide is going to be out of date.

I've tried to enable it by menuconfig, it works well, would you please
enable it by default ?


$ diff .config.old .config -Nur
--- .config.old 2016-02-25 01:04:25.816381913 -0800
+++ .config     2016-02-25 01:16:31.332232759 -0800
@@ -1479,7 +1479,7 @@
  # CONFIG_SCSI_DEBUG is not set
  # CONFIG_SCSI_PMCRAID is not set
  # CONFIG_SCSI_PM8001 is not set
-# CONFIG_SCSI_VIRTIO is not set
+CONFIG_SCSI_VIRTIO=y
  # CONFIG_SCSI_DH is not set
  # CONFIG_SCSI_OSD_INITIATOR is not set
  CONFIG_ATA=y

$ du bzImage bzImage_new
6752    bzImage
6756    bzImage_new

It nearly has no impact on the size.

-- 
Thanks

Robert