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Re: [libvirt] [PATCH 1/2] Add VSCSI bus type and VSCSI controller type for pseries guest.




On 2012年05月04日 10:05, Li Zhang wrote:
Now, there is only SCSI bus and controller type in libvirt.
And when configuring VSCSI controller, it needs to configure
the spapr-vio bus address type externally. It's a little
inconvenient to configure the controller type.

Not sure if I understood correctly, but we have a scsi controller
model type 'ibmvscsi'. Isn't it enough to tell the difference?
And 'ibmvsci' is choosed as the default scsi controller model if
the guest arch is ppc64. Also qemu driver will assign the default
'reg' for spapr-vio address type when building the qemu command line
(if reg is not specified). So it doesn't need to specify
the spapr-vio address type explicitly if I'm right. And thus I
can't see any inconvenience. :-)


This patch is to add VSCSI bus type and VSCSI controller type.
And handle with the problems when VSCSI and SCSI devices
working together, by assign the even number to index of
VSCSI controller and odd number to index of SCSI controller.

And when the VSCSI controller is always assigned as SPAPRVIO
bus address type and SCSI controller will be always assigned
as PCI bus address, which is implemented according to the
controllers' type.

So when one disk is based on VSCSI controller, then assign
the bus as 'vscsi', and one right VSCSI controller will be
selected.

If one disk is based on VSCSI controller, the XML file is
as the following:

<disk type='file' device='disk'>
    <driver name='qemu' type='raw'/>
    <source file='/path/file'/>
    <target dev='sda' bus='vscsi'/>
</disk>

VSCSI controllers' configuration in XML file will be like
this:

<controller type='vscsi' index='0'>
</controller>

If one disk is based on 'vscsi', the 'vscsi' bus should be assigned
externally. Otherwise, it will be set as 'scsi' bus according
to the 'sd' target prefix of the disk.

Signed-off-by: Li Zhang<zhlcindy linux vnet ibm com>
---
  src/conf/domain_conf.c  |   62 ++++++++++++++++++++++++++++++++++++++++++-----
  src/conf/domain_conf.h  |    2 ++
  src/qemu/qemu_command.c |   11 +++++++--
  3 files changed, 67 insertions(+), 8 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 184ff23..99005b7 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -177,7 +177,8 @@ VIR_ENUM_IMPL(virDomainDiskBus, VIR_DOMAIN_DISK_BUS_LAST,
                "xen",
                "usb",
                "uml",
-              "sata")
+              "sata",
+              "vscsi")

  VIR_ENUM_IMPL(virDomainDiskCache, VIR_DOMAIN_DISK_CACHE_LAST,
                "default",
@@ -236,7 +237,8 @@ VIR_ENUM_IMPL(virDomainController, VIR_DOMAIN_CONTROLLER_TYPE_LAST,
                "sata",
                "virtio-serial",
                "ccid",
-              "usb")
+              "usb",
+              "vscsi")

  VIR_ENUM_IMPL(virDomainControllerModelSCSI, VIR_DOMAIN_CONTROLLER_MODEL_SCSI_LAST,
                "auto",
@@ -2973,6 +2975,7 @@ virDomainDiskDefAssignAddress(virCapsPtr caps, virDomainDiskDefPtr def)

      switch (def->bus) {
      case VIR_DOMAIN_DISK_BUS_SCSI:
+    case VIR_DOMAIN_DISK_BUS_VSCSI:
          def->info.type = VIR_DOMAIN_DEVICE_ADDRESS_TYPE_DRIVE;

          if (caps->hasWideScsiBus) {
@@ -2981,6 +2984,16 @@ virDomainDiskDefAssignAddress(virCapsPtr caps, virDomainDiskDefPtr def)
               * Unit 7 is the SCSI controller itself. Therefore unit 7
               * cannot be assigned to disks and is skipped.
               */
+
+            /* assign even number to index of vscsi controller,
+             * and odd number to index of scsi controller, which can
+             * make vscsi controller and scsi controller work together.
+             */
+            if (def->bus == VIR_DOMAIN_DISK_BUS_VSCSI)
+                def->info.addr.drive.controller = (idx / 15) * 2;
+            else
+                def->info.addr.drive.controller = (idx / 15) * 2 + 1;
+
              def->info.addr.drive.controller = idx / 15;
              def->info.addr.drive.bus = 0;
              def->info.addr.drive.unit = idx % 15;
@@ -2992,6 +3005,17 @@ virDomainDiskDefAssignAddress(virCapsPtr caps, virDomainDiskDefPtr def)
          } else {
              /* For a narrow SCSI bus we define the default mapping to be
               * 7 units per bus, 1 bus per controller, many controllers */
+
+            /* assign even number to index of vscsi controller,
+             * and odd number to index of scsi controller, which can
+             * make vscsi controller and scsi controller work together.
+             */
+
+            if (def->bus == VIR_DOMAIN_DISK_BUS_VSCSI)
+                def->info.addr.drive.controller = (idx / 7) * 2;
+            else
+                def->info.addr.drive.controller = (idx / 7 ) * 2 + 1;
+
              def->info.addr.drive.controller = idx / 7;
              def->info.addr.drive.bus = 0;
              def->info.addr.drive.unit = idx % 7;
@@ -4061,6 +4085,10 @@ virDomainControllerDefParseXML(xmlNodePtr node,
          break;
      }

+    case VIR_DOMAIN_CONTROLLER_TYPE_VSCSI:
+        def->info.type = VIR_DOMAIN_DEVICE_ADDRESS_TYPE_SPAPRVIO;
+        break;
+
      default:
          break;
      }
@@ -7606,6 +7634,9 @@ static int virDomainDefMaybeAddController(virDomainDefPtr def,
      cont->idx = idx;
      cont->model = -1;

+    if (cont->type == VIR_DOMAIN_CONTROLLER_TYPE_VSCSI)
+        cont->info.type = VIR_DOMAIN_DEVICE_ADDRESS_TYPE_SPAPRVIO;
+
      if (cont->type == VIR_DOMAIN_CONTROLLER_TYPE_VIRTIO_SERIAL) {
          cont->opts.vioserial.ports = -1;
          cont->opts.vioserial.vectors = -1;
@@ -10133,9 +10164,19 @@ static int virDomainDefAddDiskControllersForType(virDomainDefPtr def,
              maxController = def->disks[i]->info.addr.drive.controller;
      }

-    for (i = 0 ; i<= maxController ; i++) {
-        if (virDomainDefMaybeAddController(def, controllerType, i)<  0)
-            return -1;
+    /* To make scsi and vscsi can work together correctly,
+     * assign even number to index of vscsi controller
+     * and odd number of scsi controller.*/
+    if (diskBus == VIR_DOMAIN_DISK_BUS_VSCSI) {
+        for (i = 0 ; i * 2<= maxController ; i ++ ) {
+            if (virDomainDefMaybeAddController(def, controllerType, 2 * i)<  0)
+                return -1;
+        }
+    } else {
+        for (i = 0 ; i * 2 + 1<= maxController ; i ++ ) {
+            if (virDomainDefMaybeAddController(def, controllerType, 2 * i + 1)<  0)
+                return -1;
+        }
      }

      return 0;
@@ -10247,6 +10288,11 @@ int virDomainDefAddImplicitControllers(virDomainDefPtr def)
                                                VIR_DOMAIN_DISK_BUS_SATA)<  0)
          return -1;

+    if (virDomainDefAddDiskControllersForType(def,
+                                              VIR_DOMAIN_CONTROLLER_TYPE_VSCSI,
+                                              VIR_DOMAIN_DISK_BUS_VSCSI)<  0)
+        return -1;
+
      if (virDomainDefMaybeAddVirtioSerialController(def)<  0)
          return -1;

@@ -13175,7 +13221,11 @@ int virDiskNameToBusDeviceIndex(const virDomainDiskDefPtr disk,
              *devIdx = idx % 2;
              break;
          case VIR_DOMAIN_DISK_BUS_SCSI:
-            *busIdx = idx / 7;
+            *busIdx = (idx / 7) * 2 + 1;
+            *devIdx = idx % 7;
+            break;
+        case VIR_DOMAIN_DISK_BUS_VSCSI:
+            *busIdx = (idx / 7) * 2;
              *devIdx = idx % 7;
              break;
          case VIR_DOMAIN_DISK_BUS_FDC:
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 5aa8fc1..0066eba 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -418,6 +418,7 @@ enum virDomainDiskBus {
      VIR_DOMAIN_DISK_BUS_USB,
      VIR_DOMAIN_DISK_BUS_UML,
      VIR_DOMAIN_DISK_BUS_SATA,
+    VIR_DOMAIN_DISK_BUS_VSCSI,

      VIR_DOMAIN_DISK_BUS_LAST
  };
@@ -597,6 +598,7 @@ enum virDomainControllerType {
      VIR_DOMAIN_CONTROLLER_TYPE_VIRTIO_SERIAL,
      VIR_DOMAIN_CONTROLLER_TYPE_CCID,
      VIR_DOMAIN_CONTROLLER_TYPE_USB,
+    VIR_DOMAIN_CONTROLLER_TYPE_VSCSI,

      VIR_DOMAIN_CONTROLLER_TYPE_LAST
  };
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 070d13e..bb3be17 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -57,7 +57,8 @@ VIR_ENUM_IMPL(virDomainDiskQEMUBus, VIR_DOMAIN_DISK_BUS_LAST,
                "xen",
                "usb",
                "uml",
-              "sata")
+              "sata",
+              "vscsi")


  VIR_ENUM_DECL(qemuDiskCacheV1)
@@ -429,6 +430,7 @@ static int qemuAssignDeviceDiskAliasFixed(virDomainDiskDefPtr disk)
              ret = virAsprintf(&dev_name, "ide%d-cd%d", busid, devid);
          break;
      case VIR_DOMAIN_DISK_BUS_SCSI:
+    case VIR_DOMAIN_DISK_BUS_VSCSI:
          if (disk->device == VIR_DOMAIN_DISK_DEVICE_DISK)
              ret = virAsprintf(&dev_name, "scsi%d-hd%d", busid, devid);
          else
@@ -1836,6 +1838,7 @@ qemuBuildDriveStr(virConnectPtr conn ATTRIBUTE_UNUSED,

      switch (disk->bus) {
      case VIR_DOMAIN_DISK_BUS_SCSI:
+    case VIR_DOMAIN_DISK_BUS_VSCSI:
          if (disk->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_DRIVE) {
              qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                              _("unexpected address type for scsi disk"));
@@ -2223,6 +2226,7 @@ qemuBuildDriveDevStr(virDomainDefPtr def,
                            disk->info.addr.drive.unit);
          break;
      case VIR_DOMAIN_DISK_BUS_SCSI:
+    case VIR_DOMAIN_DISK_BUS_VSCSI:
          if (disk->device == VIR_DOMAIN_DISK_DEVICE_LUN) {
              if (!qemuCapsGet(qemuCaps, QEMU_CAPS_SCSI_BLOCK)) {
                  qemuReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
@@ -6447,6 +6451,8 @@ qemuParseCommandLineDisk(virCapsPtr caps,
                  def->bus = VIR_DOMAIN_DISK_BUS_IDE;
              else if (STREQ(values[i], "scsi"))
                  def->bus = VIR_DOMAIN_DISK_BUS_SCSI;
+            else if (STREQ(values[i], "vscsi"))
+                def->bus = VIR_DOMAIN_DISK_BUS_VSCSI;
              else if (STREQ(values[i], "virtio"))
                  def->bus = VIR_DOMAIN_DISK_BUS_VIRTIO;
              else if (STREQ(values[i], "xen"))
@@ -6577,7 +6583,8 @@ qemuParseCommandLineDisk(virCapsPtr caps,

      if (def->bus == VIR_DOMAIN_DISK_BUS_IDE) {
          def->dst = strdup("hda");
-    } else if (def->bus == VIR_DOMAIN_DISK_BUS_SCSI) {
+    } else if (def->bus == VIR_DOMAIN_DISK_BUS_SCSI ||
+               def->bus == VIR_DOMAIN_DISK_BUS_VSCSI) {
          def->dst = strdup("sda");
      } else if (def->bus == VIR_DOMAIN_DISK_BUS_VIRTIO) {
          def->dst = strdup("vda");


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