All the way back at the end of 2009, commit d78554d8 added a check
that prevented scsi disks from having a bus != 0 due to problems that
caused (noted in the comments). At that time, -device wasn't supported
by qemu, so the -drive parameter had to identify each disk by bus
type (the "if" option), bus#, and unit#.
Since that time qemu has added the ability to provide such details
about a disk in a -device parameter, which will contain an id, and
that id can be referenced in -drive rather than giving
type/bus/unit. Since no bus= option is present in the -drive string in
this case, the problem with a non-0 bus is presumably no longer
present, so this patch makes the restriction active only when -device
isn't used.
qemuxml2argv-disk-scsi-lun-passthrough has been modified to set non-0
buses to assure that the restriction is no longer valid.
---
src/qemu/qemu_command.c | 13 +++++++++----
.../qemuxml2argv-disk-scsi-lun-passthrough.args | 12 ++++++------
.../qemuxml2argv-disk-scsi-lun-passthrough.xml | 4 ++--
3 files changed, 17 insertions(+), 12 deletions(-)
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 12de4ca..260a468 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -3546,10 +3546,15 @@ qemuBuildDriveStr(virConnectPtr conn,
goto error;
}
- /* Setting bus= attr for SCSI drives, causes a controller
- * to be created. Yes this is slightly odd. It is not possible
- * to have > 1 bus on a SCSI controller (yet). */
- if (disk->info.addr.drive.bus != 0) {
+ /* Setting bus= attr (only happens when *not* using -device to
+ * specify the other half of the disk device) for SCSI drives,
+ * causes a controller to be created. Yes this is slightly
+ * odd. And it means that is not possible to have > 1 bus on a
+ * SCSI controller unless -device is supported/used (at this
+ * point only very old qemu binaries don't support
+ * -device). */
+ if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE) &&
+ disk->info.addr.drive.bus != 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("SCSI controller only supports 1 bus"));
goto error;
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-scsi-lun-passthrough.args b/tests/qemuxml2argvdata/qemuxml2argv-disk-scsi-lun-passthrough.args
index e1dfc1a..739ceb4 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-scsi-lun-passthrough.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-scsi-lun-passthrough.args
@@ -5,10 +5,10 @@ pc -m 214 -smp 1 -nographic -nodefaults \
-device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x3 \
-device lsi,id=scsi1,bus=pci.0,addr=0x4 \
-usb \
--drive file=/dev/HostVG/QEMUGuest1,if=none,id=drive-scsi0-0-0-0 \
--device scsi-block,channel=0,bus=scsi0.0,scsi-id=0,lun=0,\
-drive=drive-scsi0-0-0-0,id=scsi0-0-0-0 \
--drive file=/dev/HostVG/QEMUGuest2,if=none,id=drive-scsi0-0-1-1 \
--device scsi-block,channel=0,bus=scsi0.0,scsi-id=1,lun=1,\
-drive=drive-scsi0-0-1-1,id=scsi0-0-1-1 \
+-drive file=/dev/HostVG/QEMUGuest1,if=none,id=drive-scsi0-1-0-0 \
+-device scsi-block,channel=1,bus=scsi0.0,scsi-id=0,lun=0,\
+drive=drive-scsi0-1-0-0,id=scsi0-1-0-0 \
+-drive file=/dev/HostVG/QEMUGuest2,if=none,id=drive-scsi0-2-1-1 \
+-device scsi-block,channel=2,bus=scsi0.0,scsi-id=1,lun=1,\
+drive=drive-scsi0-2-1-1,id=scsi0-2-1-1 \
-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-scsi-lun-passthrough.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-scsi-lun-passthrough.xml
index 3858ede..84dd12e 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-scsi-lun-passthrough.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-scsi-lun-passthrough.xml
@@ -17,12 +17,12 @@
<disk type='block' device='lun'>
<source dev='/dev/HostVG/QEMUGuest1'/>
<target dev='hda' bus='scsi'/>
- <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+ <address type='drive' controller='0' bus='1' target='0' unit='0'/>
</disk>
<disk type='block' device='lun'>
<source dev='/dev/HostVG/QEMUGuest2'/>
<target dev='hdb' bus='scsi'/>
- <address type='drive' controller='0' bus='0' target='1' unit='1'/>
+ <address type='drive' controller='0' bus='2' target='1' unit='1'/>
</disk>
<controller type='scsi' index='0' model='virtio-scsi'/>
<controller type='scsi' index='1' model='lsilogic'/>
--
2.1.0
--
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