qemu: support new pci controller model "pcie-root-port"

This is backed by the qemu device ioh3420.

chassis and port from the <target> subelement are used to store/set the
respective qemu device options for the ioh3420. Currently, chassis is
set to be the index of the controller, and port is set to
"(slot << 3) + function" (per suggestion from Alex Williamson).

src/qemu/qemu_command.c

@@ -1607,6 +1607,12 @@ qemuCollectPCIAddress(virDomainDefPtr def ATTRIBUTE_UNUSED,
                  */
                 flags = VIR_PCI_CONNECT_TYPE_PCIE;
                 break;
+            case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_ROOT_PORT:
+                /* pcie-root-port can only connect to pcie-root, isn't
+                 * hot-pluggable
+                 */
+                flags = VIR_PCI_CONNECT_TYPE_PCIE_ROOT;
+                break;
             default:
                 break;
             }
@@ -2284,6 +2290,13 @@ qemuDomainAssignPCIAddresses(virDomainDefPtr def,
                         options->modelName = VIR_DOMAIN_CONTROLLER_PCI_MODEL_NAME_I82801B11_BRIDGE;
                     break;
                 case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_ROOT_PORT:
+                    if (options->modelName == VIR_DOMAIN_CONTROLLER_PCI_MODEL_NAME_NONE)
+                        options->modelName = VIR_DOMAIN_CONTROLLER_PCI_MODEL_NAME_IOH3420;
+                    if (options->chassis == -1)
+                       options->chassis = cont->idx;
+                    if (options->port == -1)
+                       options->port = (addr->slot << 3) + addr->function;
+                    break;
                 case VIR_DOMAIN_CONTROLLER_MODEL_PCI_ROOT:
                 case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_ROOT:
                 case VIR_DOMAIN_CONTROLLER_MODEL_PCI_LAST:
@@ -2395,6 +2408,10 @@ qemuAssignDevicePCISlots(virDomainDefPtr def,
                  */
                 flags = VIR_PCI_CONNECT_TYPE_PCIE;
                 break;
+            case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_ROOT_PORT:
+                /* pcie-root-port can only plug into pcie-root */
+                flags = VIR_PCI_CONNECT_TYPE_PCIE_ROOT;
+                break;
             default:
                 flags = VIR_PCI_CONNECT_HOTPLUGGABLE | VIR_PCI_CONNECT_TYPE_PCI;
                 break;
@@ -4722,6 +4739,39 @@ qemuBuildControllerDevStr(virDomainDefPtr domainDef,
             }
             virBufferAsprintf(&buf, "%s,id=%s", modelName, def->info.alias);
             break;
+        case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_ROOT_PORT:
+            if (def->opts.pciopts.modelName
+                == VIR_DOMAIN_CONTROLLER_PCI_MODEL_NAME_NONE) {
+                virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                               _("autogenerated pcie-root-port options not set"));
+                goto error;
+            }
+            modelName = virDomainControllerPCIModelNameTypeToString(def->opts.pciopts.modelName);
+            if (!modelName) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("unknown pcie-root-port model name value %d"),
+                               def->opts.pciopts.modelName);
+                goto error;
+            }
+            if (def->opts.pciopts.modelName
+                != VIR_DOMAIN_CONTROLLER_PCI_MODEL_NAME_IOH3420) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                               _("PCI controller model name '%s' "
+                                 "is not valid for a pcie-root-port"),
+                               modelName);
+                goto error;
+            }
+            if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_IOH3420)) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                               _("the pcie-root-port (ioh3420) "
+                                 "controller is not supported in this QEMU binary"));
+                goto error;
+            }
+
+            virBufferAsprintf(&buf, "%s,port=0x%x,chassis=%d,id=%s",
+                              modelName, def->opts.pciopts.port,
+                              def->opts.pciopts.chassis, def->info.alias);
+            break;
         }
         break;
 

tests/qemuxml2argvdata/qemuxml2argv-pcie-root-port-too-many.xml

+<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>
+    <disk type='block' device='disk'>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='sda' bus='sata'/>
+      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+    </disk>
+    <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'/>
+    <controller type='pci' index='3' model='pcie-root-port'/>
+    <controller type='pci' index='4' model='pcie-root-port'/>
+    <controller type='pci' index='5' model='pcie-root-port'/>
+    <controller type='pci' index='6' model='pcie-root-port'/>
+    <controller type='pci' index='7' model='pcie-root-port'/>
+    <controller type='pci' index='8' model='pcie-root-port'/>
+    <controller type='pci' index='9' model='pcie-root-port'/>
+    <controller type='pci' index='10' model='pcie-root-port'/>
+    <controller type='pci' index='11' model='pcie-root-port'/>
+    <controller type='pci' index='12' model='pcie-root-port'/>
+    <controller type='pci' index='13' model='pcie-root-port'/>
+    <controller type='pci' index='14' model='pcie-root-port'/>
+    <controller type='pci' index='15' model='pcie-root-port'/>
+    <controller type='pci' index='16' model='pcie-root-port'/>
+    <controller type='pci' index='17' model='pcie-root-port'/>
+    <controller type='pci' index='18' model='pcie-root-port'/>
+    <controller type='pci' index='19' model='pcie-root-port'/>
+    <controller type='pci' index='20' model='pcie-root-port'/>
+    <controller type='pci' index='21' model='pcie-root-port'/>
+    <controller type='pci' index='22' model='pcie-root-port'/>
+    <controller type='pci' index='23' model='pcie-root-port'/>
+    <controller type='pci' index='24' model='pcie-root-port'/>
+    <controller type='pci' index='25' model='pcie-root-port'/>
+    <controller type='pci' index='26' model='pcie-root-port'/>
+    <controller type='pci' index='27' model='pcie-root-port'/>
+    <controller type='pci' index='28' model='pcie-root-port'/>
+    <controller type='pci' index='29' model='pcie-root-port'/>
+    <controller type='pci' index='30' model='pcie-root-port'/>
+    <controller type='pci' index='31' model='pcie-root-port'/>
+    <controller type='sata' index='0'/>
+    <video>
+      <model type='qxl' ram='65536' vram='32768' vgamem='8192' heads='1'/>
+    </video>
+    <memballoon model='none'/>
+  </devices>
+</domain>

tests/qemuxml2argvdata/qemuxml2argv-pcie-root-port.args

+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=none \
+/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-bridge,id=pci.1,bus=pcie.0,addr=0x1e \
+-device pci-bridge,chassis_nr=2,id=pci.2,bus=pci.1,addr=0x1 \
+-device ioh3420,port=0x10,chassis=3,id=pci.3,bus=pcie.0,addr=0x2 \
+-device ioh3420,port=0x1a,chassis=40,id=pci.4,bus=pcie.0,addr=0x3 \
+-drive file=/dev/HostVG/QEMUGuest1,if=none,id=drive-sata0-0-0 \
+-device ide-drive,bus=ide.0,drive=drive-sata0-0-0,id=sata0-0-0 \
+-vga qxl -global qxl-vga.ram_size=67108864 -global qxl-vga.vram_size=33554432

tests/qemuxml2argvtest.c

@@ -1507,6 +1507,21 @@ mymain(void)
             QEMU_CAPS_DRIVE, QEMU_CAPS_ICH9_AHCI,
             QEMU_CAPS_VGA, QEMU_CAPS_DEVICE_VIDEO_PRIMARY,
             QEMU_CAPS_VGA, QEMU_CAPS_VGA_QXL, QEMU_CAPS_DEVICE_QXL);
+    DO_TEST("pcie-root-port",
+            QEMU_CAPS_DEVICE, QEMU_CAPS_DEVICE_PCI_BRIDGE,
+            QEMU_CAPS_DEVICE_DMI_TO_PCI_BRIDGE,
+            QEMU_CAPS_DEVICE_IOH3420,
+            QEMU_CAPS_DRIVE, QEMU_CAPS_ICH9_AHCI,
+            QEMU_CAPS_VGA, QEMU_CAPS_DEVICE_VIDEO_PRIMARY,
+            QEMU_CAPS_VGA, QEMU_CAPS_VGA_QXL, QEMU_CAPS_DEVICE_QXL);
+
+    DO_TEST_ERROR("pcie-root-port-too-many",
+            QEMU_CAPS_DEVICE, QEMU_CAPS_DEVICE_PCI_BRIDGE,
+            QEMU_CAPS_DEVICE_DMI_TO_PCI_BRIDGE,
+            QEMU_CAPS_DEVICE_IOH3420,
+            QEMU_CAPS_DRIVE, QEMU_CAPS_ICH9_AHCI,
+            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,

tests/qemuxml2xmltest.c

@@ -568,6 +568,7 @@ mymain(void)
     DO_TEST_DIFFERENT("pcie-root");
     DO_TEST_DIFFERENT("q35");
     DO_TEST("pcie-root-port");
+    DO_TEST("pcie-root-port-too-many");
 
     DO_TEST("hostdev-scsi-lsi");
     DO_TEST("hostdev-scsi-virtio-scsi");