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Description of problem:
boot a guest with a AHCI disk drive (not CD-ROM) adding readonly=on, but the qemu will fail to boot up. while the AHCI(SATA) CD-ROM can support the readonly=on.

Version-Release number of selected component (if applicable):
host info:
kernel-3.7.0-0.34.el7.x86_64
qemu-kvm-1.3.0-5.el7.x86_6
guest info:
kernel-3.7.0-0.34.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.boot a guest with a AHCI disk drive (not CD-ROM) adding readonly=on.
e.g:...-device ahci,id=ahci1,bus=pci.0,multifunction=on,addr=0x8 -drive file=/home/my-data-disk.raw,if=none,media=disk,format=raw,id=drive-sata-disk,readonly=on -device ide-hd/ide-drive,drive=drive-sata-disk,id=sata-disk,bus=ahci1.0,unit=0
2.
3.
  
Actual results:
after the step 1,
guest fail to boot up with qemu prompt like: 
qemu-kvm: -device ide-hd,drive=drive-sata-disk,id=sata-disk,bus=ahci1.0,unit=0: Can't use a read-only drive
qemu-kvm: -device ide-hd,drive=drive-sata-disk,id=sata-disk,bus=ahci1.0,unit=0: Device 'ide-hd' could not be initialized

Expected results:

Additional info:

The ATA standard does not support read-only hard disks.