Function kvm_dintc_realize() is added if kvm_irqchip_in_kernel is
set. It is to create and initialize DINTC device in kernel mode.
and use kvm_irqchip_send_msi() to send  msi to kernel.

Signed-off-by: Song Gao <gaosong@loongson.cn>
---
 hw/intc/loongarch_dintc.c         | 14 +++++++++
 hw/intc/loongarch_dintc_kvm.c     | 50 +++++++++++++++++++++++++++++++
 hw/intc/meson.build               |  2 ++
 include/hw/intc/loongarch_dintc.h |  9 ++++++
 linux-headers/asm-loongarch/kvm.h |  3 ++
 linux-headers/linux/kvm.h         |  2 ++
 6 files changed, 80 insertions(+)
 create mode 100644 hw/intc/loongarch_dintc_kvm.c

diff --git a/hw/intc/loongarch_dintc.c b/hw/intc/loongarch_dintc.c
index 32bdd171c5..f6d0fcaada 100644
--- a/hw/intc/loongarch_dintc.c
+++ b/hw/intc/loongarch_dintc.c
@@ -39,6 +39,7 @@ static void do_set_vcpu_dintc_irq(CPUState *cs, run_on_cpu_data data)
     env = &LOONGARCH_CPU(cs)->env;
     cpu_synchronize_state(cs);
     set_bit(irq, (unsigned long *)&env->CSR_MSGIS);
+
 }
 
 static void loongarch_dintc_mem_write(void *opaque, hwaddr addr,
@@ -53,6 +54,15 @@ static void loongarch_dintc_mem_write(void *opaque, hwaddr addr,
     cs = cpu_by_arch_id(cpu_num);
     irq_num = FIELD_EX64(msg_addr, MSG_ADDR, IRQ_NUM);
 
+    if (kvm_irqchip_in_kernel()) {
+        MSIMessage msg;
+
+        msg.address = msg_addr;
+        msg.data = val;
+        kvm_irqchip_send_msi(kvm_state, msg);
+        return;
+    }
+
     async_run_on_cpu(cs, do_set_vcpu_dintc_irq,
                          RUN_ON_CPU_HOST_INT(irq_num));
     qemu_set_irq(s->cpu[cpu_num].parent_irq, 1);
@@ -95,6 +105,10 @@ static void loongarch_dintc_realize(DeviceState *dev, Error **errp)
         qdev_init_gpio_out(dev, &s->cpu[i].parent_irq, 1);
     }
 
+    if (kvm_irqchip_in_kernel()) {
+        kvm_dintc_realize(dev, errp);
+    }
+
     return;
 }
 
diff --git a/hw/intc/loongarch_dintc_kvm.c b/hw/intc/loongarch_dintc_kvm.c
new file mode 100644
index 0000000000..87cfdfd374
--- /dev/null
+++ b/hw/intc/loongarch_dintc_kvm.c
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * LoongArch AVEC interrupt kvm support
+ *
+ * Copyright (C) 2025 Loongson Technology Corporation Limited
+ */
+
+#include "qemu/osdep.h"
+#include "hw/intc/loongarch_dintc.h"
+#include "linux/kvm.h"
+#include "qapi/error.h"
+#include "system/kvm.h"
+
+void kvm_dintc_realize(DeviceState *dev, Error **errp)
+{
+    LoongArchDINTCState *lds = LOONGARCH_DINTC(dev);
+    int ret;
+
+    ret = kvm_create_device(kvm_state, KVM_DEV_TYPE_LOONGARCH_DINTC, false);
+    if (ret < 0) {
+        fprintf(stderr, "create KVM_DEV_TYPE_LOONGARCH_AVEC failed: %s\n",
+               strerror(-ret));
+        abort();
+    }
+    lds->dev_fd = ret;
+
+    /* init dintc config */
+    lds->msg_addr_base = VIRT_DINTC_BASE;
+    lds->msg_addr_size = VIRT_DINTC_SIZE;
+
+    ret = kvm_device_access(lds->dev_fd, KVM_DEV_LOONGARCH_DINTC_CTRL,
+                            KVM_DEV_LOONGARCH_DINTC_MSG_ADDR_BASE,
+                            &lds->msg_addr_base, true, NULL);
+    if (ret < 0) {
+        fprintf(stderr, "KVM_DEV_LOONGARCH_DINTC_MSG_ADDR_BASE failed: %s\n",
+                strerror(ret));
+        abort();
+    }
+
+    ret = kvm_device_access(lds->dev_fd, KVM_DEV_LOONGARCH_DINTC_CTRL,
+                            KVM_DEV_LOONGARCH_DINTC_MSG_ADDR_SIZE,
+                            &lds->msg_addr_size, true, NULL);
+    if (ret < 0) {
+        fprintf(stderr, "KVM_DEV_LOONGARCH_DINTC_MSG_ADDR_SIZE failed: %s\n",
+                strerror(ret));
+        abort();
+    }
+}
+
+
diff --git a/hw/intc/meson.build b/hw/intc/meson.build
index faae20b93d..9c669872b9 100644
--- a/hw/intc/meson.build
+++ b/hw/intc/meson.build
@@ -81,3 +81,5 @@ specific_ss.add(when: 'CONFIG_LOONGARCH_EXTIOI', if_true: files('loongarch_extio
 specific_ss.add(when: ['CONFIG_KVM', 'CONFIG_LOONGARCH_EXTIOI'],
                if_true: files('loongarch_extioi_kvm.c'))
 specific_ss.add(when: 'CONFIG_LOONGARCH_DINTC', if_true: files('loongarch_dintc.c'))
+specific_ss.add(when: ['CONFIG_KVM', 'CONFIG_LOONGARCH_DINTC'],
+               if_true: files('loongarch_dintc_kvm.c'))
diff --git a/include/hw/intc/loongarch_dintc.h b/include/hw/intc/loongarch_dintc.h
index 01bb1e465c..be32cec621 100644
--- a/include/hw/intc/loongarch_dintc.h
+++ b/include/hw/intc/loongarch_dintc.h
@@ -9,8 +9,13 @@
 #include "hw/sysbus.h"
 #include "hw/loongarch/virt.h"
 #include "system/memory.h"
+#include "hw/pci-host/ls7a.h"
 
 #define NR_VECTORS     256
+#define IRQ_BIT_BASE    5
+#define IRQ_BIT_LEN     8
+#define CPU_BIT_BASE   13
+#define CPU_BIT_LEN     8
 
 #define TYPE_LOONGARCH_DINTC "loongarch_dintc"
 OBJECT_DECLARE_TYPE(LoongArchDINTCState, LoongArchDINTCClass, LOONGARCH_DINTC)
@@ -25,7 +30,10 @@ struct LoongArchDINTCState {
     SysBusDevice parent_obj;
     MemoryRegion dintc_mmio;
     DINTCCore *cpu;
+    int dev_fd;
     uint32_t num_cpu;
+    uint64_t msg_addr_base;
+    uint64_t msg_addr_size;
 };
 
 struct LoongArchDINTCClass {
@@ -34,3 +42,4 @@ struct LoongArchDINTCClass {
     DeviceRealize parent_realize;
     DeviceUnrealize parent_unrealize;
 };
+void kvm_dintc_realize(DeviceState *dev, Error **errp);
diff --git a/linux-headers/asm-loongarch/kvm.h b/linux-headers/asm-loongarch/kvm.h
index 9bac543591..c3ced8b002 100644
--- a/linux-headers/asm-loongarch/kvm.h
+++ b/linux-headers/asm-loongarch/kvm.h
@@ -154,4 +154,7 @@ struct kvm_iocsr_entry {
 #define KVM_DEV_LOONGARCH_PCH_PIC_GRP_CTRL	        0x40000006
 #define KVM_DEV_LOONGARCH_PCH_PIC_CTRL_INIT	        0
 
+#define KVM_DEV_LOONGARCH_DINTC_CTRL			0x40000007
+#define  KVM_DEV_LOONGARCH_DINTC_MSG_ADDR_BASE		0x0
+#define  KVM_DEV_LOONGARCH_DINTC_MSG_ADDR_SIZE		0x1
 #endif /* __UAPI_ASM_LOONGARCH_KVM_H */
diff --git a/linux-headers/linux/kvm.h b/linux-headers/linux/kvm.h
index 4ea28ef7ca..dc6c28c85c 100644
--- a/linux-headers/linux/kvm.h
+++ b/linux-headers/linux/kvm.h
@@ -1190,6 +1190,8 @@ enum kvm_device_type {
 #define KVM_DEV_TYPE_LOONGARCH_EIOINTC	KVM_DEV_TYPE_LOONGARCH_EIOINTC
 	KVM_DEV_TYPE_LOONGARCH_PCHPIC,
 #define KVM_DEV_TYPE_LOONGARCH_PCHPIC	KVM_DEV_TYPE_LOONGARCH_PCHPIC
+	KVM_DEV_TYPE_LOONGARCH_DINTC,
+#define KVM_DEV_TYPE_LOONGARCH_DINTC	KVM_DEV_TYPE_LOONGARCH_DINTC
 
 	KVM_DEV_TYPE_MAX,
 
-- 
2.51.0