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[libvirt] [PATCH 07/13] qemu: use controller alias when constructing disk/controller args



This makes sure that that the commandlines generated for disk devices
and disk controller devices are *all* using the alias that has been
set in the controller's object as the id of the controller, rather
than hardcoding a printf.

Since this "fixes" the controller name used for the sata controller,
the commandline arg for the sata controller in the sata test case had
to be adjusted to be "sata0" instead of "ahci0".
---
 src/qemu/qemu_command.c                            | 46 +++++++++++-----------
 .../qemuxml2argv-disk-sata-device.args             |  4 +-
 2 files changed, 24 insertions(+), 26 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 89beeb3..b9f4c51 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -4014,6 +4014,7 @@ qemuBuildDriveDevStr(virDomainDefPtr def,
 {
     virBuffer opt = VIR_BUFFER_INITIALIZER;
     const char *bus = virDomainDiskQEMUBusTypeToString(disk->bus);
+    const char *contAlias;
     int controllerModel;
 
     if (virDomainDiskDefDstDuplicates(def))
@@ -4061,7 +4062,11 @@ qemuBuildDriveDevStr(virDomainDefPtr def,
             virBufferAddLit(&opt, "ide-drive");
         }
 
-        virBufferAsprintf(&opt, ",bus=ide.%d,unit=%d",
+        if (!(contAlias = virDomainControllerAliasFind(def, VIR_DOMAIN_CONTROLLER_TYPE_IDE,
+                                                       disk->info.addr.drive.controller)))
+           goto error;
+        virBufferAsprintf(&opt, ",bus=%s.%d,unit=%d",
+                          contAlias,
                           disk->info.addr.drive.bus,
                           disk->info.addr.drive.unit);
         break;
@@ -4114,6 +4119,10 @@ qemuBuildDriveDevStr(virDomainDefPtr def,
             }
         }
 
+        if (!(contAlias = virDomainControllerAliasFind(def, VIR_DOMAIN_CONTROLLER_TYPE_SCSI,
+                                                       disk->info.addr.drive.controller)))
+           goto error;
+
         if (controllerModel == VIR_DOMAIN_CONTROLLER_MODEL_SCSI_LSILOGIC) {
             if (disk->info.addr.drive.target != 0) {
                 virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
@@ -4122,8 +4131,8 @@ qemuBuildDriveDevStr(virDomainDefPtr def,
                 goto error;
             }
 
-            virBufferAsprintf(&opt, ",bus=scsi%d.%d,scsi-id=%d",
-                              disk->info.addr.drive.controller,
+            virBufferAsprintf(&opt, ",bus=%s.%d,scsi-id=%d",
+                              contAlias,
                               disk->info.addr.drive.bus,
                               disk->info.addr.drive.unit);
         } else {
@@ -4144,8 +4153,8 @@ qemuBuildDriveDevStr(virDomainDefPtr def,
                 }
             }
 
-            virBufferAsprintf(&opt, ",bus=scsi%d.0,channel=%d,scsi-id=%d,lun=%d",
-                              disk->info.addr.drive.controller,
+            virBufferAsprintf(&opt, ",bus=%s.0,channel=%d,scsi-id=%d,lun=%d",
+                              contAlias,
                               disk->info.addr.drive.bus,
                               disk->info.addr.drive.target,
                               disk->info.addr.drive.unit);
@@ -4173,23 +4182,12 @@ qemuBuildDriveDevStr(virDomainDefPtr def,
             virBufferAddLit(&opt, "ide-drive");
         }
 
-        if (qemuDomainMachineIsQ35(def) &&
-            disk->info.addr.drive.controller == 0) {
-            /* Q35 machines have an implicit ahci (sata) controller at
-             * 00:1F.2 which for some reason is hardcoded with the id
-             * "ide" instead of the seemingly more reasonable "ahci0"
-             * or "sata0".
-             */
-            virBufferAsprintf(&opt, ",bus=ide.%d", disk->info.addr.drive.unit);
-        } else {
-            /* All other ahci controllers have been created by
-             * libvirt, and we gave them the id "ahci${n}" where ${n}
-             * is the controller number. So we identify them that way.
-             */
-            virBufferAsprintf(&opt, ",bus=ahci%d.%d",
-                              disk->info.addr.drive.controller,
-                              disk->info.addr.drive.unit);
-        }
+        if (!(contAlias = virDomainControllerAliasFind(def, VIR_DOMAIN_CONTROLLER_TYPE_SATA,
+                                                      disk->info.addr.drive.controller)))
+           goto error;
+        virBufferAsprintf(&opt, ",bus=%s.%d",
+                          contAlias,
+                          disk->info.addr.drive.unit);
         break;
 
     case VIR_DOMAIN_DISK_BUS_VIRTIO:
@@ -4541,7 +4539,7 @@ qemuBuildControllerDevStr(virDomainDefPtr domainDef,
                            _("Unsupported controller model: %s"),
                            virDomainControllerModelSCSITypeToString(def->model));
         }
-        virBufferAsprintf(&buf, ",id=scsi%d", def->idx);
+        virBufferAsprintf(&buf, ",id=%s", def->info.alias);
         break;
 
     case VIR_DOMAIN_CONTROLLER_TYPE_VIRTIO_SERIAL:
@@ -4576,7 +4574,7 @@ qemuBuildControllerDevStr(virDomainDefPtr domainDef,
         break;
 
     case VIR_DOMAIN_CONTROLLER_TYPE_SATA:
-        virBufferAsprintf(&buf, "ahci,id=ahci%d", def->idx);
+        virBufferAsprintf(&buf, "ahci,id=%s", def->info.alias);
         break;
 
     case VIR_DOMAIN_CONTROLLER_TYPE_USB:
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-sata-device.args b/tests/qemuxml2argvdata/qemuxml2argv-disk-sata-device.args
index 475a0b1..7ae610f 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-sata-device.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-sata-device.args
@@ -1,7 +1,7 @@
 LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=none \
 /usr/bin/qemu -S -M \
 pc -m 214 -smp 1 -nographic -nodefconfig -nodefaults -monitor \
-unix:/tmp/test-monitor,server,nowait -no-acpi -boot c -device ahci,id=ahci0,\
+unix:/tmp/test-monitor,server,nowait -no-acpi -boot c -device ahci,id=sata0,\
 bus=pci.0,addr=0x3 -usb -drive file=/dev/HostVG/QEMUGuest1,if=none,\
-id=drive-sata0-0-0 -device ide-drive,bus=ahci0.0,drive=drive-sata0-0-0,\
+id=drive-sata0-0-0 -device ide-drive,bus=sata0.0,drive=drive-sata0-0-0,\
 id=sata0-0-0 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4
-- 
2.1.0


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