hw/intc/loongarch_ipi: Add kernel irqchip realize function

Function kvm_ipi_realize() is added if kvm_irqchip_in_kernel() return true.
It is to create and initialize IPI device in kernel mode.

Reviewed-by: Song Gao <gaosong@loongson.cn>
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Message-ID: <20250606063033.2557365-4-maobibo@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>

hw/intc/loongarch_ipi.c

@@ -11,6 +11,7 @@
 #include "qapi/error.h"
 #include "hw/intc/loongarch_ipi.h"
 #include "hw/qdev-properties.h"
+#include "system/kvm.h"
 #include "target/loongarch/cpu.h"
 
 static AddressSpace *get_iocsr_as(CPUState *cpu)
@@ -91,6 +92,10 @@ static void loongarch_ipi_realize(DeviceState *dev, Error **errp)
         lics->cpu[i].ipi = lics;
         qdev_init_gpio_out(dev, &lics->cpu[i].irq, 1);
     }
+
+    if (kvm_irqchip_in_kernel()) {
+        kvm_ipi_realize(dev, errp);
+    }
 }
 
 static void loongarch_ipi_reset_hold(Object *obj, ResetType type)

hw/intc/loongarch_ipi_kvm.c

@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * LoongArch IPI interrupt KVM support
+ *
+ * Copyright (C) 2025 Loongson Technology Corporation Limited
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "hw/intc/loongarch_ipi.h"
+#include "system/kvm.h"
+#include "target/loongarch/cpu.h"
+
+void kvm_ipi_realize(DeviceState *dev, Error **errp)
+{
+    LoongarchIPIState *lis = LOONGARCH_IPI(dev);
+    int ret;
+
+    ret = kvm_create_device(kvm_state, KVM_DEV_TYPE_LOONGARCH_IPI, false);
+    if (ret < 0) {
+        fprintf(stderr, "IPI KVM_CREATE_DEVICE failed: %s\n",
+                strerror(-ret));
+        abort();
+    }
+
+    lis->dev_fd = ret;
+}

hw/intc/loongson_ipi_common.c

@@ -11,6 +11,7 @@
 #include "hw/irq.h"
 #include "qemu/log.h"
 #include "migration/vmstate.h"
+#include "system/kvm.h"
 #include "trace.h"
 
 MemTxResult loongson_ipi_core_readl(void *opaque, hwaddr addr, uint64_t *data,
@@ -255,6 +256,10 @@ static void loongson_ipi_common_realize(DeviceState *dev, Error **errp)
     LoongsonIPICommonState *s = LOONGSON_IPI_COMMON(dev);
     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
 
+    if (kvm_irqchip_in_kernel()) {
+        return;
+    }
+
     memory_region_init_io(&s->ipi_iocsr_mem, OBJECT(dev),
                           &loongson_ipi_iocsr_ops,
                           s, "loongson_ipi_iocsr", 0x48);

hw/intc/meson.build

@@ -71,6 +71,8 @@ specific_ss.add(when: 'CONFIG_M68K_IRQC', if_true: files('m68k_irqc.c'))
 specific_ss.add(when: 'CONFIG_LOONGSON_IPI_COMMON', if_true: files('loongson_ipi_common.c'))
 specific_ss.add(when: 'CONFIG_LOONGSON_IPI', if_true: files('loongson_ipi.c'))
 specific_ss.add(when: 'CONFIG_LOONGARCH_IPI', if_true: files('loongarch_ipi.c'))
+specific_ss.add(when: ['CONFIG_KVM', 'CONFIG_LOONGARCH_IPI'],
+                if_true: files('loongarch_ipi_kvm.c'))
 specific_ss.add(when: 'CONFIG_LOONGARCH_PCH_PIC', if_true: files('loongarch_pch_pic.c', 'loongarch_pic_common.c'))
 specific_ss.add(when: 'CONFIG_LOONGARCH_PCH_MSI', if_true: files('loongarch_pch_msi.c'))
 specific_ss.add(when: 'CONFIG_LOONGARCH_EXTIOI', if_true: files('loongarch_extioi.c', 'loongarch_extioi_common.c'))

include/hw/intc/loongarch_ipi.h

@@ -16,6 +16,7 @@ OBJECT_DECLARE_TYPE(LoongarchIPIState, LoongarchIPIClass, LOONGARCH_IPI)
 
 struct LoongarchIPIState {
     LoongsonIPICommonState parent_obj;
+    int  dev_fd;
 };
 
 struct LoongarchIPIClass {
@@ -24,4 +25,6 @@ struct LoongarchIPIClass {
     ResettablePhases parent_phases;
 };
 
+void kvm_ipi_realize(DeviceState *dev, Error **errp);
+
 #endif