Add AHCI support to qemu driver

Tested with multiple AHCI controllers and multiple disks attached
to a controller. E.g.,

    <disk type='file' device='disk'>
      <driver name='qemu' type='raw'/>
      <source file='/var/lib/libvirt/images/test/disk0.raw'/>
      <target dev='sda' bus='sata'/>
      <address type='drive' controller='0' bus='0' unit='0'/>
    </disk>
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw'/>
      <source file='/var/lib/libvirt/images/test/disk1.raw'/>
      <target dev='sdb' bus='sata'/>
      <address type='drive' controller='0' bus='0' unit='1'/>
    </disk>
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw'/>
      <source file='/var/lib/libvirt/images/test/disk2.raw'/>
      <target dev='sdc' bus='sata'/>
      <address type='drive' controller='1' bus='0' unit='0'/>
    </disk>
    <controller type='sata' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </controller>
    <controller type='sata' index='1'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
    </controller>

docs/formatdomain.html.in

@@ -972,11 +972,12 @@
         as a device ordering hint.  The optional <code>bus</code>
         attribute specifies the type of disk device to emulate;
         possible values are driver specific, with typical values being
-        "ide", "scsi", "virtio", "xen" or "usb". If omitted, the bus type is
-        inferred from the style of the device name. eg, a device named 'sda'
-        will typically be exported using a SCSI bus.
+        "ide", "scsi", "virtio", "xen", "usb" or "sata". If omitted, the bus
+        type is inferred from the style of the device name. eg, a device named
+        'sda' will typically be exported using a SCSI bus.
         <span class="since">Since 0.0.3; <code>bus</code> attribute since 0.4.3;
-        "usb" attribute value since after 0.4.4</span></dd>
+        "usb" attribute value since after 0.4.4; "sata" attribute value since
+        0.9.7</span></dd>
       <dt><code>driver</code></dt>
       <dd>
         The optional driver element allows specifying further details

docs/schemas/domaincommon.rng

@@ -790,6 +790,7 @@
             <value>xen</value>
             <value>usb</value>
             <value>uml</value>
+            <value>sata</value>
           </choice>
         </attribute>
       </optional>

src/conf/domain_conf.c

@@ -2189,6 +2189,15 @@ virDomainDiskDefAssignAddress(virCapsPtr caps, virDomainDiskDefPtr def)
         def->info.addr.drive.unit = (idx % 2);
         break;
 
+    case VIR_DOMAIN_DISK_BUS_SATA:
+        /* For SATA we define the default mapping to be 6 units
+         * per bus, 1 bus per controller, many controllers */
+        def->info.type = VIR_DOMAIN_DEVICE_ADDRESS_TYPE_DRIVE;
+        def->info.addr.drive.controller = idx / 6;
+        def->info.addr.drive.bus = 0;
+        def->info.addr.drive.unit = idx % 6;
+        break;
+
     case VIR_DOMAIN_DISK_BUS_FDC:
         /* For FDC we define the default mapping to be 2 units
          * per bus, 1 bus per controller, many controllers */
@@ -8748,6 +8757,11 @@ int virDomainDefAddImplicitControllers(virDomainDefPtr def)
                                               VIR_DOMAIN_DISK_BUS_IDE) < 0)
         return -1;
 
+    if (virDomainDefAddDiskControllersForType(def,
+                                              VIR_DOMAIN_CONTROLLER_TYPE_SATA,
+                                              VIR_DOMAIN_DISK_BUS_SATA) < 0)
+        return -1;
+
     if (virDomainDefMaybeAddVirtioSerialController(def) < 0)
         return -1;
 

src/qemu/qemu_capabilities.c

@@ -140,6 +140,7 @@ VIR_ENUM_IMPL(qemuCaps, QEMU_CAPS_LAST,
 
               "cache-unsafe", /* 75 */
               "rombar",
+              "ich9-ahci",
     );
 
 struct qemu_feature_flags {
@@ -1255,6 +1256,8 @@ qemuCapsParseDeviceStr(const char *str, virBitmapPtr flags)
         qemuCapsSet(flags, QEMU_CAPS_USB_REDIR);
     if (strstr(str, "name \"usb-hub\""))
         qemuCapsSet(flags, QEMU_CAPS_USB_HUB);
+    if (strstr(str, "name \"ich9-ahci\""))
+        qemuCapsSet(flags, QEMU_CAPS_ICH9_AHCI);
 
     /* Prefer -chardev spicevmc (detected earlier) over -device spicevmc */
     if (!qemuCapsGet(flags, QEMU_CAPS_CHARDEV_SPICEVMC) &&

src/qemu/qemu_capabilities.h

@@ -114,6 +114,7 @@ enum qemuCapsFlags {
 
     QEMU_CAPS_DRIVE_CACHE_UNSAFE = 75, /* Is cache=unsafe supported? */
     QEMU_CAPS_PCI_ROMBAR         = 76, /* -device rombar=0|1 */
+    QEMU_CAPS_ICH9_AHCI         = 77, /* -device ich9-ahci */
 
     QEMU_CAPS_LAST,                   /* this must always be the last item */
 };

src/qemu/qemu_command.c

@@ -1776,6 +1776,12 @@ qemuBuildDriveDevStr(virDomainDiskDefPtr disk,
                           disk->info.addr.drive.bus,
                           disk->info.addr.drive.unit);
         break;
+    case VIR_DOMAIN_DISK_BUS_SATA:
+        virBufferAddLit(&opt, "ide-drive");
+        virBufferAsprintf(&opt, ",bus=ahci%d.%d",
+                          disk->info.addr.drive.controller,
+                          disk->info.addr.drive.unit);
+        break;
     case VIR_DOMAIN_DISK_BUS_VIRTIO:
         virBufferAddLit(&opt, "virtio-blk-pci");
         qemuBuildIoEventFdStr(&opt, disk->ioeventfd, qemuCaps);
@@ -1983,6 +1989,10 @@ qemuBuildControllerDevStr(virDomainControllerDefPtr def,
         virBufferAsprintf(&buf, "usb-ccid,id=ccid%d", def->idx);
         break;
 
+    case VIR_DOMAIN_CONTROLLER_TYPE_SATA:
+        virBufferAsprintf(&buf, "ahci,id=ahci%d", def->idx);
+        break;
+
     case VIR_DOMAIN_CONTROLLER_TYPE_USB:
         if (qemuBuildUSBControllerDevStr(def, qemuCaps, &buf) == -1)
             goto error;
@@ -3783,14 +3793,22 @@ qemuBuildCommandLine(virConnectPtr conn,
                 cont->type == VIR_DOMAIN_CONTROLLER_TYPE_FDC)
                 continue;
 
-            /* QEMU doesn't implement a SATA driver */
+            /* Only recent QEMU implements a SATA (AHCI) controller */
             if (cont->type == VIR_DOMAIN_CONTROLLER_TYPE_SATA) {
-                qemuReportError(VIR_ERR_CONFIG_UNSUPPORTED,
-                                "%s", _("SATA is not supported with this QEMU binary"));
-                goto error;
-            }
+                if (!qemuCapsGet(qemuCaps, QEMU_CAPS_ICH9_AHCI)) {
+                    qemuReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                                    "%s", _("SATA is not supported with this QEMU binary"));
+                    goto error;
+                } else {
+                    char *devstr;
 
-            if (def->controllers[i]->type == VIR_DOMAIN_CONTROLLER_TYPE_USB &&
+                    virCommandAddArg(cmd, "-device");
+                    if (!(devstr = qemuBuildControllerDevStr(cont, qemuCaps, NULL)))
+                        goto error;
+
+                    virCommandAddArg(cmd, devstr);
+                }
+            } else if (def->controllers[i]->type == VIR_DOMAIN_CONTROLLER_TYPE_USB &&
                 def->controllers[i]->model == -1 &&
                 !qemuCapsGet(qemuCaps, QEMU_CAPS_PIIX3_USB_UHCI)) {
                 if (usblegacy) {

tests/qemuxml2argvdata/qemuxml2argv-disk-sata-device.args

+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test /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,\
+bus=pci.0,addr=0x3 -drive file=/dev/HostVG/QEMUGuest1,if=none,\
+id=drive-sata0-0-0 -device ide-drive,bus=ahci0.0,drive=drive-sata0-0-0,\
+id=sata0-0-0 -usb -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4

tests/qemuxml2argvdata/qemuxml2argv-disk-sata-device.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory>219136</memory>
+  <currentMemory>219136</currentMemory>
+  <vcpu>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <disk type='block' device='disk'>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='sda' bus='sata'/>
+      <address type='drive' controller='0' bus='0' unit='0'/>
+    </disk>
+    <controller type='sata' index='0'/>
+    <memballoon model='virtio'/>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -363,6 +363,9 @@ mymain(void)
             QEMU_CAPS_DRIVE, QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG);
     DO_TEST("disk-scsi-device-auto", false,
             QEMU_CAPS_DRIVE, QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG);
+    DO_TEST("disk-sata-device", false,
+            QEMU_CAPS_DRIVE, QEMU_CAPS_DEVICE,
+            QEMU_CAPS_NODEFCONFIG, QEMU_CAPS_ICH9_AHCI);
     DO_TEST("disk-aio", false,
             QEMU_CAPS_DRIVE, QEMU_CAPS_DRIVE_AIO,
             QEMU_CAPS_DRIVE_CACHE_V2, QEMU_CAPS_DRIVE_FORMAT);