[PATCHv2 17/17] qemu: support new pci controller model "pcie-switch-downstream-port"

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This is backed by the qemu device xio3130-downstream. It can only be
connected to a pcie-switch-upstream-port (x3130-upstream) on the
upstream side.
---
V2:

* change test case to reflect additional pcie-root-port between
  pcie-root and pcie-switch-upstream-port and add a 2nd switch that is
  connected to a downstream port of the 1st switch.

 src/qemu/qemu_command.c                            | 42 ++++++++++++++++++++++
 .../qemuxml2argv-pcie-switch-downstream-port.args  | 18 ++++++++++
 tests/qemuxml2argvtest.c                           |  9 +++++
 3 files changed, 69 insertions(+)
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-pcie-switch-downstream-port.args

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index e3f0663..155a94a 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -1610,6 +1610,12 @@ qemuCollectPCIAddress(virDomainDefPtr def ATTRIBUTE_UNUSED,
                  */
                 flags = VIR_PCI_CONNECT_TYPE_PCIE_PORT;
                 break;
+            case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_SWITCH_DOWNSTREAM_PORT:
+                /* pcie-switch-downstream-port can only connect to a
+                 * pcie-switch-upstream-port, and can't be hot-plugged.
+                 */
+                flags = VIR_PCI_CONNECT_TYPE_PCIE_SWITCH;
+                break;
             default:
                 break;
             }
@@ -2292,6 +2298,13 @@ qemuDomainAssignPCIAddresses(virDomainDefPtr def,
                         deviceName = "x3130-upstream";
                     break;
                 case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_SWITCH_DOWNSTREAM_PORT:
+                    if (!options->type)
+                        deviceName = "xio3130-downstream";
+                    if (options->chassis == -1)
+                       options->chassis = cont->idx;
+                    if (options->port == -1)
+                       options->port = addr->slot;
+                    break;
                 case VIR_DOMAIN_CONTROLLER_MODEL_PCI_ROOT:
                 case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_ROOT:
                 case VIR_DOMAIN_CONTROLLER_MODEL_PCI_LAST:
@@ -2416,6 +2429,10 @@ qemuAssignDevicePCISlots(virDomainDefPtr def,
                  */
                 flags = VIR_PCI_CONNECT_TYPE_PCIE_PORT;
                 break;
+            case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_SWITCH_DOWNSTREAM_PORT:
+                /* pcie-switch-port can only plug into pcie-switch */
+                flags = VIR_PCI_CONNECT_TYPE_PCIE_SWITCH;
+                break;
             default:
                 flags = VIR_PCI_CONNECT_HOTPLUGGABLE | VIR_PCI_CONNECT_TYPE_PCI;
                 break;
@@ -4766,6 +4783,31 @@ qemuBuildControllerDevStr(virDomainDefPtr domainDef,
             virBufferAsprintf(&buf, "%s,id=%s",
                               def->opts.pciopts.type, def->info.alias);
             break;
+        case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_SWITCH_DOWNSTREAM_PORT:
+            if (!def->opts.pciopts.type) {
+                virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                               _("autogenerated pcie-switch-downstream-port "
+                                 "options not set"));
+                goto error;
+            }
+            if (STREQ(def->opts.pciopts.type, "xio3130-downstream")) {
+                if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_XIO3130_DOWNSTREAM)) {
+                    virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                                   _("The pcie-switch-downstream-port "
+                                     "(xio3130-downstream) controller "
+                                     "is not supported in this QEMU binary"));
+                goto error;
+                }
+            } else {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("unknown pcie-switch-downstream-port device '%s'"),
+                               def->opts.pciopts.type);
+                goto error;
+            }
+            virBufferAsprintf(&buf, "%s,port=0x%x,chassis=%d,id=%s",
+                              def->opts.pciopts.type, def->opts.pciopts.port,
+                              def->opts.pciopts.chassis, def->info.alias);
+            break;
         }
         break;
 
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-pcie-switch-downstream-port.args b/tests/qemuxml2argvdata/qemuxml2argv-pcie-switch-downstream-port.args
new file mode 100644
index 0000000..fefefa2
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-pcie-switch-downstream-port.args
@@ -0,0 +1,18 @@
+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 x3130-upstream,id=pci.4,bus=pci.3,addr=0x0 \
+-device xio3130-downstream,port=0x0,chassis=5,id=pci.5,bus=pci.4,addr=0x0 \
+-device xio3130-downstream,port=0x1,chassis=6,id=pci.6,bus=pci.4,addr=0x1 \
+-device xio3130-downstream,port=0x2,chassis=7,id=pci.7,bus=pci.4,addr=0x2 \
+-device xio3130-downstream,port=0x27,chassis=30,id=pci.8,bus=pci.4,addr=0x3 \
+-device x3130-upstream,id=pci.9,bus=pci.5,addr=0x0 \
+-device xio3130-downstream,port=0x4,chassis=10,id=pci.10,bus=pci.4,addr=0x4 \
+-device xio3130-downstream,port=0x5,chassis=11,id=pci.11,bus=pci.4,addr=0x5 \
+-device xio3130-downstream,port=0x6,chassis=12,id=pci.12,bus=pci.4,addr=0x6 \
+-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
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index b42d483..287df6a 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -1512,6 +1512,15 @@ 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-switch-downstream-port",
+            QEMU_CAPS_DEVICE, QEMU_CAPS_DEVICE_PCI_BRIDGE,
+            QEMU_CAPS_DEVICE_DMI_TO_PCI_BRIDGE,
+            QEMU_CAPS_DEVICE_IOH3420,
+            QEMU_CAPS_DEVICE_X3130_UPSTREAM,
+            QEMU_CAPS_DEVICE_XIO3130_DOWNSTREAM,
+            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,
-- 
2.1.0

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