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[libvirt] [PATCH 6/7] qemu: add dmi-to-pci-bridge controller



This PCI controller connects to a PCI Express slot (e.g. one of the
slots provided by the pcie-root controller, aka "pcie.0" on the qemu
commandline), and provides 31 *non-hot-pluggable* PCI (*not* PCIe)
slots, numbered 1-31.

Any time a machine is defined which has a pcie-root controller
(i.e. any q35-based machinetype), libvirt will automatically add a
dmi-to-pci-bridge controller if one doesn't exist, and also add a
pci-bridge controller. The reasoning here is that any useful domain
will have either an immediate (startup time) or eventual (subsequent
hot-plug) need for a standard PCI slot; since the pcie-root controller
only provides PCIe slots, we need to connect a dmi-to-pci-bridge
controller to it in order to get a non-hot-plug PCI slot that we can
then use to connect a pci-bridge - the slots provided by the
pci-bridge will be both standard PCI and hot-pluggable.

Since pci-bridge devices themselves are not hot-pluggable, any new
pci-bridge controller that is added can (and will) be plugged into the
dmi-to-pci-bridge as long as it has empty slots available.
---
 docs/formatdomain.html.in                          | 28 +++++++++++++++---
 docs/schemas/domaincommon.rng                      |  1 +
 src/conf/domain_conf.c                             |  3 +-
 src/conf/domain_conf.h                             |  1 +
 src/qemu/qemu_capabilities.c                       |  2 ++
 src/qemu/qemu_capabilities.h                       |  1 +
 src/qemu/qemu_command.c                            | 34 ++++++++++++++++++++++
 src/qemu/qemu_domain.c                             | 14 +++++++--
 tests/qemuxml2argvdata/qemuxml2argv-pcie-root.args |  3 +-
 tests/qemuxml2argvdata/qemuxml2argv-q35.args       |  7 +++++
 tests/qemuxml2argvdata/qemuxml2argv-q35.xml        | 25 ++++++++++++++++
 tests/qemuxml2argvtest.c                           |  8 ++++-
 .../qemuxml2xmlout-pcie-root.xml                   | 23 +++++++++++++++
 tests/qemuxml2xmltest.c                            |  3 +-
 14 files changed, 143 insertions(+), 10 deletions(-)
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-q35.args
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-q35.xml
 create mode 100644 tests/qemuxml2xmloutdata/qemuxml2xmlout-pcie-root.xml

diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 330dca2..8fa4c0e 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -2338,16 +2338,19 @@
 
     <p>
       PCI controllers have an optional <code>model</code> attribute with
-      possible values <code>pci-root</code>, <code>pcie-root</code>
-      or <code>pci-bridge</code>.
+      possible values <code>pci-root</code>, <code>pcie-root</code>,
+      <code>pci-bridge</code>, or <code>dmi-to-pci-bridge</code>.
       For machine types which provide an implicit PCI bus, the pci-root
       controller with index=0 is auto-added and required to use PCI devices.
       pci-root has no address.
+      PCI bridges are auto-added if there are too many devices to fit on
+      the one bus provided by pci-root, or a PCI bus number greater than zero
+      was specified.
       PCI bridges can also be specified manually, but their addresses should
       only refer to PCI buses provided by already specified PCI controllers.
       Leaving gaps in the PCI controller indexes might lead to an invalid
       configuration.
-      (<span class="since">since 1.0.5</span>)
+      (pci-root and pci-bridge <span class="since">since 1.0.5</span>).
     </p>
 <pre>
   ...
@@ -2365,12 +2368,29 @@
       the pcie-root controller with index=0 is auto-added to the
       domain's configuration. pcie-root has also no address, provides
       31 slots (numbered 1-31) and can only be used to attach PCIe
-      devices.  (<span class="since">since 1.1.2</span>).
+      devices. In order to connect standard PCI devices on a system
+      which has a pcie-root controller, a pci controller
+      with <code>model='dmi-to-pci-bridge'</code> is automatically
+      added. A dmi-to-pci-bridge controller plugs into a PCIe slot (as
+      provided by pcie-root), and itself provides 31 standard PCI
+      slots (which are not hot-pluggable). In order to have
+      hot-pluggable PCI slots in the guest system, a pci-bridge
+      controller will also be automatically created and connected to
+      one of the slots of the auto-created dmi-to-pci-bridge
+      controller; all guest devices with PCI addresses that are
+      auto-determined by libvirt will be placed on this pci-bridge
+      device.  (<span class="since">since 1.1.2</span>).
     </p>
 <pre>
   ...
   &lt;devices&gt;
     &lt;controller type='pci' index='0' model='pcie-root'/&gt;
+    &lt;controller type='pci' index='1' model='dmi-to-pci-bridge'&gt;
+      &lt;address type='pci' domain='0' bus='0' slot='0xe' function='0'/&gt;
+    &lt;/controller&gt;
+    &lt;controller type='pci' index='2' model='pci-bridge'&gt;
+      &lt;address type='pci' domain='0' bus='1' slot='1' function='0'/&gt;
+    &lt;/controller&gt;
   &lt;/devices&gt;
   ...</pre>
 
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index e04be12..173359c 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -1540,6 +1540,7 @@
                 <value>pci-root</value>
                 <value>pcie-root</value>
                 <value>pci-bridge</value>
+                <value>dmi-to-pci-bridge</value>
               </choice>
             </attribute>
           </group>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 59a96f2..d17008f 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -311,7 +311,8 @@ VIR_ENUM_IMPL(virDomainController, VIR_DOMAIN_CONTROLLER_TYPE_LAST,
 VIR_ENUM_IMPL(virDomainControllerModelPCI, VIR_DOMAIN_CONTROLLER_MODEL_PCI_LAST,
               "pci-root",
               "pcie-root",
-              "pci-bridge")
+              "pci-bridge",
+              "dmi-to-pci-bridge")
 
 VIR_ENUM_IMPL(virDomainControllerModelSCSI, VIR_DOMAIN_CONTROLLER_MODEL_SCSI_LAST,
               "auto",
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 63a1444..3e118d6 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -770,6 +770,7 @@ typedef enum {
     VIR_DOMAIN_CONTROLLER_MODEL_PCI_ROOT,
     VIR_DOMAIN_CONTROLLER_MODEL_PCIE_ROOT,
     VIR_DOMAIN_CONTROLLER_MODEL_PCI_BRIDGE,
+    VIR_DOMAIN_CONTROLLER_MODEL_DMI_TO_PCI_BRIDGE,
 
     VIR_DOMAIN_CONTROLLER_MODEL_PCI_LAST
 } virDomainControllerModelPCI;
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 08406b8..47cc07a 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -234,6 +234,7 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
 
               "vnc-share-policy", /* 150 */
               "device-del-event",
+              "dmi-to-pci-bridge",
     );
 
 struct _virQEMUCaps {
@@ -1381,6 +1382,7 @@ struct virQEMUCapsStringFlags virQEMUCapsObjectTypes[] = {
     { "pci-bridge", QEMU_CAPS_DEVICE_PCI_BRIDGE },
     { "vfio-pci", QEMU_CAPS_DEVICE_VFIO_PCI },
     { "scsi-generic", QEMU_CAPS_DEVICE_SCSI_GENERIC },
+    { "i82801b11-bridge", QEMU_CAPS_DEVICE_DMI_TO_PCI_BRIDGE },
 };
 
 static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsVirtioBlk[] = {
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index f5f685d..074e55d 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -190,6 +190,7 @@ enum virQEMUCapsFlags {
     QEMU_CAPS_MLOCK              = 149, /* -realtime mlock=on|off */
     QEMU_CAPS_VNC_SHARE_POLICY   = 150, /* set display sharing policy */
     QEMU_CAPS_DEVICE_DEL_EVENT   = 151, /* DEVICE_DELETED event */
+    QEMU_CAPS_DEVICE_DMI_TO_PCI_BRIDGE  = 152, /* -device i82801b11-bridge */
 
     QEMU_CAPS_LAST,                   /* this must always be the last item */
 };
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index b6912ce..9caf036 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -1561,6 +1561,13 @@ qemuDomainPCIAddressBusSetModel(qemuDomainPCIAddressBusPtr bus,
         bus->minSlot = 1;
         bus->maxSlot = QEMU_PCI_ADDRESS_SLOT_LAST;
         break;
+    case VIR_DOMAIN_CONTROLLER_MODEL_DMI_TO_PCI_BRIDGE:
+        /* slots 1 - 31, standard PCI slots,
+         * but *not* hot-pluggable */
+        bus->flags = QEMU_PCI_CONNECT_TYPE_PCI;
+        bus->minSlot = 1;
+        bus->maxSlot = QEMU_PCI_ADDRESS_SLOT_LAST;
+        break;
     default:
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("Invalid PCI controller model %d"), model);
@@ -1669,6 +1676,12 @@ qemuCollectPCIAddress(virDomainDefPtr def ATTRIBUTE_UNUSED,
              */
             flags = QEMU_PCI_CONNECT_TYPE_PCI;
             break;
+        case VIR_DOMAIN_CONTROLLER_MODEL_DMI_TO_PCI_BRIDGE:
+            /* pci-bridge needs a PCIe slot, but it isn't
+             * hot-pluggable, so it doesn't need a hot-pluggable slot.
+             */
+            flags = QEMU_PCI_CONNECT_TYPE_PCIE;
+            break;
         default:
             break;
         }
@@ -2369,6 +2382,12 @@ qemuAssignDevicePCISlots(virDomainDefPtr def,
                  */
                 flags = QEMU_PCI_CONNECT_TYPE_PCI;
                 break;
+            case VIR_DOMAIN_CONTROLLER_MODEL_DMI_TO_PCI_BRIDGE:
+                /* dmi-to-pci-bridge requires a non-hotplug PCIe
+                 * slot
+                 */
+                flags = QEMU_PCI_CONNECT_TYPE_PCIE;
+                break;
             default:
                 flags = QEMU_PCI_CONNECT_HOTPLUGGABLE | QEMU_PCI_CONNECT_TYPE_PCI;
                 break;
@@ -4348,6 +4367,21 @@ qemuBuildControllerDevStr(virDomainDefPtr domainDef,
             virBufferAsprintf(&buf, "pci-bridge,chassis_nr=%d,id=pci.%d",
                               def->idx, def->idx);
             break;
+        case VIR_DOMAIN_CONTROLLER_MODEL_DMI_TO_PCI_BRIDGE:
+            if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_DMI_TO_PCI_BRIDGE)) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                               _("The dmi-to-pci-bridge (i82801b11-pci-bridge) "
+                                 "controller is not supported in this QEMU binary"));
+                goto error;
+            }
+            if (def->idx == 0) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                               _("dmi-to-pci-bridge index should be > 0"));
+                goto error;
+            }
+            virBufferAsprintf(&buf, "i82801b11-pci-bridge,chassis_nr=%d,id=pci.%d",
+                              def->idx, def->idx);
+            break;
         case VIR_DOMAIN_CONTROLLER_MODEL_PCI_ROOT:
         case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_ROOT:
             virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 4d04609..f5030cd 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -760,10 +760,20 @@ qemuDomainDefPostParse(virDomainDefPtr def,
             VIR_DOMAIN_CONTROLLER_MODEL_PCI_ROOT) < 0)
         return -1;
 
+    /* When a machine has a pcie-root, make sure that there is always
+     * a dmi-to-pci-bridge controller added as bus 1, and a pci-bridge
+     * as bus 2, so that standard PCI devices can be connected
+     */
     if (addPCIeRoot &&
-        virDomainDefMaybeAddController(
+        (virDomainDefMaybeAddController(
             def, VIR_DOMAIN_CONTROLLER_TYPE_PCI, 0,
-            VIR_DOMAIN_CONTROLLER_MODEL_PCIE_ROOT) < 0)
+            VIR_DOMAIN_CONTROLLER_MODEL_PCIE_ROOT) < 0 ||
+         virDomainDefMaybeAddController(
+             def, VIR_DOMAIN_CONTROLLER_TYPE_PCI, 1,
+             VIR_DOMAIN_CONTROLLER_MODEL_DMI_TO_PCI_BRIDGE) < 0 ||
+         virDomainDefMaybeAddController(
+             def, VIR_DOMAIN_CONTROLLER_TYPE_PCI, 2,
+             VIR_DOMAIN_CONTROLLER_MODEL_PCI_BRIDGE) < 0))
         return -1;
 
     return 0;
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-pcie-root.args b/tests/qemuxml2argvdata/qemuxml2argv-pcie-root.args
index e937189..75a9844 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-pcie-root.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-pcie-root.args
@@ -1,4 +1,5 @@
 LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test /usr/libexec/qemu-kvm \
 -S -M q35 -m 2048 -smp 2 -nographic -nodefaults \
 -monitor unix:/tmp/test-monitor,server,nowait -no-acpi -boot c \
--device pci-bridge,chassis_nr=1,id=pci.1,bus=pci.1,addr=0x1 -usb
+-device i82801b11-pci-bridge,chassis_nr=1,id=pci.1,bus=pci.0,addr=0x1 \
+-device pci-bridge,chassis_nr=2,id=pci.2,bus=pci.1,addr=0x1 -usb
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-q35.args b/tests/qemuxml2argvdata/qemuxml2argv-q35.args
new file mode 100644
index 0000000..2c67739
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-q35.args
@@ -0,0 +1,7 @@
+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test \
+/usr/libexec/qemu-kvm -S -M q35 -m 2048 -smp 2 -nographic -nodefaults \
+-monitor unix:/tmp/test-monitor,server,nowait -no-acpi -boot c \
+-device i82801b11-pci-bridge,chassis_nr=1,id=pci.1,bus=pci.0,addr=0x1 \
+-device pci-bridge,chassis_nr=2,id=pci.2,bus=pci.1,addr=0x1 \
+-usb \
+-vga qxl -global qxl.ram_size=67108864 -global qxl.vram_size=18874368
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-q35.xml b/tests/qemuxml2argvdata/qemuxml2argv-q35.xml
new file mode 100644
index 0000000..3541b14
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-q35.xml
@@ -0,0 +1,25 @@
+<domain type='qemu'>
+  <name>q35-test</name>
+  <uuid>11dbdcdd-4c3b-482b-8903-9bdb8c0a2774</uuid>
+  <memory unit='KiB'>2097152</memory>
+  <currentMemory unit='KiB'>2097152</currentMemory>
+  <vcpu placement='static' cpuset='0-1'>2</vcpu>
+  <os>
+    <type arch='x86_64' machine='q35'>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/libexec/qemu-kvm</emulator>
+    <controller type='pci' index='0' model='pcie-root'/>
+    <controller type='pci' index='1' model='dmi-to-pci-bridge'/>
+    <controller type='pci' index='2' model='pci-bridge'/>
+    <video>
+      <model type='qxl' ram='65536' vram='18432' heads='1'/>
+    </video>
+    <memballoon model='none'/>
+  </devices>
+</domain>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 57c6989..aba0f88 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -995,7 +995,13 @@ mymain(void)
     DO_TEST("pci-bridge-many-disks",
             QEMU_CAPS_DEVICE, QEMU_CAPS_DRIVE, QEMU_CAPS_DEVICE_PCI_BRIDGE);
     DO_TEST("pcie-root",
-            QEMU_CAPS_DEVICE, QEMU_CAPS_DEVICE_PCI_BRIDGE);
+            QEMU_CAPS_DEVICE, QEMU_CAPS_DEVICE_PCI_BRIDGE,
+            QEMU_CAPS_DEVICE_DMI_TO_PCI_BRIDGE);
+    DO_TEST("q35",
+            QEMU_CAPS_DEVICE, QEMU_CAPS_DEVICE_PCI_BRIDGE,
+            QEMU_CAPS_DEVICE_DMI_TO_PCI_BRIDGE,
+            QEMU_CAPS_VGA, QEMU_CAPS_DEVICE_VIDEO_PRIMARY,
+            QEMU_CAPS_VGA, QEMU_CAPS_VGA_QXL, QEMU_CAPS_DEVICE_QXL);
 
     DO_TEST("hostdev-scsi-lsi", QEMU_CAPS_DRIVE,
             QEMU_CAPS_DEVICE, QEMU_CAPS_DRIVE,
diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-pcie-root.xml b/tests/qemuxml2xmloutdata/qemuxml2xmlout-pcie-root.xml
new file mode 100644
index 0000000..25c77f1
--- /dev/null
+++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-pcie-root.xml
@@ -0,0 +1,23 @@
+<domain type='qemu'>
+  <name>q35-test</name>
+  <uuid>11dbdcdd-4c3b-482b-8903-9bdb8c0a2774</uuid>
+  <memory unit='KiB'>2097152</memory>
+  <currentMemory unit='KiB'>2097152</currentMemory>
+  <vcpu placement='static' cpuset='0-1'>2</vcpu>
+  <os>
+    <type arch='x86_64' machine='q35'>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/libexec/qemu-kvm</emulator>
+    <controller type='pci' index='0' model='pcie-root'/>
+    <controller type='usb' index='0'/>
+    <controller type='pci' index='1' model='dmi-to-pci-bridge'/>
+    <controller type='pci' index='2' model='pci-bridge'/>
+    <memballoon model='none'/>
+  </devices>
+</domain>
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index ea511b8..8b4590a 100644
--- a/tests/qemuxml2xmltest.c
+++ b/tests/qemuxml2xmltest.c
@@ -294,7 +294,8 @@ mymain(void)
     DO_TEST_DIFFERENT("pci-bridge-many-disks");
     DO_TEST_DIFFERENT("pci-autoadd-addr");
     DO_TEST_DIFFERENT("pci-autoadd-idx");
-    DO_TEST("pcie-root");
+    DO_TEST_DIFFERENT("pcie-root");
+    DO_TEST("q35");
 
     DO_TEST("hostdev-scsi-lsi");
     DO_TEST("hostdev-scsi-virtio-scsi");
-- 
1.7.11.7


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