Il 20/08/2013 11:59, Timon Wang ha scritto:
On Tue, Aug 20, 2013 at 4:33 PM, Paolo Bonzini <pbonzini@redhat.com> wrote:
Il 20/08/2013 08:00, Timon Wang ha scritto:
<disk type='file' device='disk'> <driver name='qemu' type='raw' cache='none'/> <source file='/home/images/win2008_2_sys'/> <target dev='hda' bus='ide'/> <boot order='3'/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <source file='/home/isos/windows2008_64r2.iso'/> <target dev='sdc' bus='ide'/> <readonly/> <boot order='1'/> <address type='drive' controller='0' bus='1' target='0' unit='0'/> </disk> <disk type='block' device='disk'>
I'm not sure this will be enough, but if you want passthrough to the host device you should use device='lun' here. However, you still would not be able to issue SCSI reservations unless you run QEMU with the CAP_SYS_RAWIO capability (using "<disk ... rawio='yes'>").
After change the libvirt xml like this: <disk type='block' device='lun' rawio='yes'> <driver name='qemu' type='raw' cache='none'/> <source dev='/dev/VM-IMAGES-BACKUP-DO-NOT-REMOVE/q_disk'/> <target dev='sda' bus='scsi'/> <shareable/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk> I got these errors: char device redirected to /dev/pts/1 (label charserial0) qemu-system-x86_64: -device scsi-block,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0: scsi-block: INQUIRY failed qemu-system-x86_64: -device scsi-block,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0: Device 'scsi-block' could not be initialized
Can you do # ls -l /dev/VM-IMAGES-BACKUP-DO-NOT-REMOVE/q_disk # sg_inq /dev/VM-IMAGES-BACKUP-DO-NOT-REMOVE/q_disk ? Paolo