Support for loongarch64 in the QEMU driver

Implement support for loongarch64 in the QEMU driver.

Signed-off-by: Xianglai Li <lixianglai@loongson.cn>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>

src/qemu/qemu_capabilities.c

@@ -1146,7 +1146,8 @@ virQEMUCapsInitGuestFromBinary(virCaps *caps,
                                       NULL, NULL, 0, NULL);
     }
 
-    if ((ARCH_IS_X86(guestarch) || guestarch == VIR_ARCH_AARCH64))
+    if (ARCH_IS_X86(guestarch) || guestarch == VIR_ARCH_AARCH64 ||
+        ARCH_IS_LOONGARCH(guestarch))
         virCapabilitiesAddGuestFeatureWithToggle(guest, VIR_CAPS_GUEST_FEATURE_TYPE_ACPI,
                                                  true, true);
 
@@ -2696,7 +2697,7 @@ static const char *preferredMachines[] =
     NULL, /* VIR_ARCH_ITANIUM (doesn't exist in QEMU any more) */
     "lm32-evr", /* VIR_ARCH_LM32 */
 
-    NULL, /* VIR_ARCH_LOONGARCH64 */
+    "virt", /* VIR_ARCH_LOONGARCH64 */
     "mcf5208evb", /* VIR_ARCH_M68K */
     "petalogix-s3adsp1800", /* VIR_ARCH_MICROBLAZE */
     "petalogix-s3adsp1800", /* VIR_ARCH_MICROBLAZEEL */
@@ -3771,7 +3772,7 @@ virQEMUCapsInitCPUModel(virQEMUCaps *qemuCaps,
     } else if (ARCH_IS_X86(qemuCaps->arch)) {
         ret = virQEMUCapsInitCPUModelX86(qemuCaps, type, modelInfo,
                                          cpu, migratable);
-    } else if (ARCH_IS_ARM(qemuCaps->arch)) {
+    } else if (ARCH_IS_ARM(qemuCaps->arch) || ARCH_IS_LOONGARCH(qemuCaps->arch)) {
         ret = 2;
     }
 

src/qemu/qemu_command.c

@@ -9186,9 +9186,11 @@ qemuChrIsPlatformDevice(const virDomainDef *def,
         }
     }
 
-    if (ARCH_IS_RISCV(def->os.arch)) {
+    if (ARCH_IS_RISCV(def->os.arch) ||
+        ARCH_IS_LOONGARCH(def->os.arch)) {
 
-        /* 16550a (used by riscv/virt guests) is a platform device */
+        /* 16550a (used by the virt machine type on some architectures)
+         * is a platform device */
         if (chr->deviceType == VIR_DOMAIN_CHR_DEVICE_TYPE_SERIAL &&
             chr->targetType == VIR_DOMAIN_CHR_SERIAL_TARGET_TYPE_SYSTEM &&
             chr->targetModel == VIR_DOMAIN_CHR_SERIAL_TARGET_MODEL_16550A) {

src/qemu/qemu_domain.c

@@ -4117,7 +4117,7 @@ qemuDomainGetSCSIControllerModel(const virDomainDef *def,
 
     if (qemuDomainIsPSeries(def))
         return VIR_DOMAIN_CONTROLLER_MODEL_SCSI_IBMVSCSI;
-    if (ARCH_IS_S390(def->os.arch))
+    if (ARCH_IS_S390(def->os.arch) || qemuDomainIsLoongArchVirt(def))
         return VIR_DOMAIN_CONTROLLER_MODEL_SCSI_VIRTIO_SCSI;
     if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_SCSI_LSI))
         return VIR_DOMAIN_CONTROLLER_MODEL_SCSI_LSILOGIC;
@@ -4263,10 +4263,13 @@ qemuDomainDefAddDefaultDevices(virQEMUDriver *driver,
             addPCIRoot = true;
         break;
 
+    case VIR_ARCH_LOONGARCH64:
+        addPCIeRoot = true;
+        break;
+
     case VIR_ARCH_CRIS:
     case VIR_ARCH_ITANIUM:
     case VIR_ARCH_LM32:
-    case VIR_ARCH_LOONGARCH64:
     case VIR_ARCH_M68K:
     case VIR_ARCH_MICROBLAZE:
     case VIR_ARCH_MICROBLAZEEL:
@@ -5437,6 +5440,7 @@ qemuDomainDefaultNetModel(const virDomainDef *def,
     /* When there are no backwards compatibility concerns getting in
      * the way, virtio is a good default */
     if (ARCH_IS_S390(def->os.arch) ||
+        qemuDomainIsLoongArchVirt(def) ||
         qemuDomainIsRISCVVirt(def)) {
         return VIR_DOMAIN_NET_MODEL_VIRTIO;
     }
@@ -5680,6 +5684,9 @@ qemuDomainControllerDefPostParse(virDomainControllerDef *cont,
                     cont->model = VIR_DOMAIN_CONTROLLER_MODEL_USB_QEMU_XHCI;
                 else if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_NEC_USB_XHCI))
                     cont->model = VIR_DOMAIN_CONTROLLER_MODEL_USB_NEC_XHCI;
+            } else if (ARCH_IS_LOONGARCH(def->os.arch)) {
+                if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_QEMU_XHCI))
+                    cont->model = VIR_DOMAIN_CONTROLLER_MODEL_USB_QEMU_XHCI;
             }
         }
         /* forbid usb model 'qusb1' and 'qusb2' in this kind of hyperviosr */
@@ -5779,7 +5786,9 @@ qemuDomainChrDefPostParse(virDomainChrDef *chr,
             chr->targetType = VIR_DOMAIN_CHR_SERIAL_TARGET_TYPE_ISA;
         } else if (qemuDomainIsPSeries(def)) {
             chr->targetType = VIR_DOMAIN_CHR_SERIAL_TARGET_TYPE_SPAPR_VIO;
-        } else if (qemuDomainIsARMVirt(def) || qemuDomainIsRISCVVirt(def)) {
+        } else if (qemuDomainIsARMVirt(def) ||
+                   qemuDomainIsLoongArchVirt(def) ||
+                   qemuDomainIsRISCVVirt(def)) {
             chr->targetType = VIR_DOMAIN_CHR_SERIAL_TARGET_TYPE_SYSTEM;
         } else if (ARCH_IS_S390(def->os.arch)) {
             chr->targetType = VIR_DOMAIN_CHR_SERIAL_TARGET_TYPE_SCLP;
@@ -5805,7 +5814,8 @@ qemuDomainChrDefPostParse(virDomainChrDef *chr,
         case VIR_DOMAIN_CHR_SERIAL_TARGET_TYPE_SYSTEM:
             if (qemuDomainIsARMVirt(def)) {
                 chr->targetModel = VIR_DOMAIN_CHR_SERIAL_TARGET_MODEL_PL011;
-            } else if (qemuDomainIsRISCVVirt(def)) {
+            } else if (qemuDomainIsLoongArchVirt(def) ||
+                       qemuDomainIsRISCVVirt(def)) {
                 chr->targetModel = VIR_DOMAIN_CHR_SERIAL_TARGET_MODEL_16550A;
             }
             break;
@@ -5977,6 +5987,7 @@ qemuDomainDefaultVideoDevice(const virDomainDef *def,
     if (ARCH_IS_PPC64(def->os.arch))
         return VIR_DOMAIN_VIDEO_TYPE_VGA;
     if (qemuDomainIsARMVirt(def) ||
+        qemuDomainIsLoongArchVirt(def) ||
         qemuDomainIsRISCVVirt(def) ||
         ARCH_IS_S390(def->os.arch)) {
         return VIR_DOMAIN_VIDEO_TYPE_VIRTIO;
@@ -9030,6 +9041,22 @@ qemuDomainMachineIsPSeries(const char *machine,
 }
 
 
+static bool
+qemuDomainMachineIsLoongArchVirt(const char *machine,
+                                 const virArch arch)
+{
+    if (!ARCH_IS_LOONGARCH(arch))
+        return false;
+
+    if (STREQ(machine, "virt") ||
+        STRPREFIX(machine, "virt-")) {
+        return true;
+    }
+
+    return false;
+}
+
+
 static bool
 qemuDomainMachineIsMipsMalta(const char *machine,
                              const virArch arch)
@@ -9123,6 +9150,13 @@ qemuDomainIsMipsMalta(const virDomainDef *def)
 }
 
 
+bool
+qemuDomainIsLoongArchVirt(const virDomainDef *def)
+{
+    return qemuDomainMachineIsLoongArchVirt(def->os.machine, def->os.arch);
+}
+
+
 bool
 qemuDomainHasPCIRoot(const virDomainDef *def)
 {
@@ -9209,6 +9243,7 @@ qemuDomainSupportsPCIMultibus(const virDomainDef *def)
     /* In some cases, support for multibus is limited to some machine
      * types */
     if (qemuDomainIsARMVirt(def) ||
+        qemuDomainIsLoongArchVirt(def) ||
         qemuDomainIsRISCVVirt(def)) {
         return true;
     }

src/qemu/qemu_domain.h

@@ -828,6 +828,7 @@ bool qemuDomainIsQ35(const virDomainDef *def);
 bool qemuDomainIsI440FX(const virDomainDef *def);
 bool qemuDomainIsS390CCW(const virDomainDef *def);
 bool qemuDomainIsARMVirt(const virDomainDef *def);
+bool qemuDomainIsLoongArchVirt(const virDomainDef *def);
 bool qemuDomainIsRISCVVirt(const virDomainDef *def);
 bool qemuDomainIsPSeries(const virDomainDef *def);
 bool qemuDomainIsMipsMalta(const virDomainDef *def);

src/qemu/qemu_validate.c

@@ -2064,6 +2064,7 @@ qemuValidateDomainChrDef(const virDomainChrDef *dev,
                 isCompatible = false;
             }
             if (dev->targetModel == VIR_DOMAIN_CHR_SERIAL_TARGET_MODEL_16550A &&
+                !qemuDomainIsLoongArchVirt(def) &&
                 !qemuDomainIsRISCVVirt(def)) {
                 isCompatible = false;
             }