[PATCH 05/15] hw/intc/loongarch_ipi: Add irqchip-in-kernel realize function

[Bibo Mao]

Function kvm_loongarch_ipi_realize() is added if irqchip-in-kernel
property is enabled. It is to notify KVM kernel to create IPI device
in kernel mode.

Signed-off-by: Bibo Mao <maob...@loongson.cn>
---
 hw/intc/loongarch_ipi.c         |  4 ++++
 hw/intc/loongarch_ipi_kvm.c     | 27 +++++++++++++++++++++++++++
 hw/intc/meson.build             |  2 ++
 include/hw/intc/loongarch_ipi.h |  3 +++
 4 files changed, 36 insertions(+)
 create mode 100644 hw/intc/loongarch_ipi_kvm.c

diff --git a/hw/intc/loongarch_ipi.c b/hw/intc/loongarch_ipi.c
index 64e0250958..5e240382ad 100644
--- a/hw/intc/loongarch_ipi.c
+++ b/hw/intc/loongarch_ipi.c
@@ -98,6 +98,10 @@ 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_enabled() && lis->irqchip_in_kernel) {
+        kvm_loongarch_ipi_realize(dev, errp);
+    }
 }
 
 static void loongarch_ipi_reset_hold(Object *obj, ResetType type)
diff --git a/hw/intc/loongarch_ipi_kvm.c b/hw/intc/loongarch_ipi_kvm.c
new file mode 100644
index 0000000000..e8fcd3bd2f
--- /dev/null
+++ b/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_loongarch_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;
+}
diff --git a/hw/intc/meson.build b/hw/intc/meson.build
index 70e7548c52..1cc999771d 100644
--- a/hw/intc/meson.build
+++ b/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'))
diff --git a/include/hw/intc/loongarch_ipi.h b/include/hw/intc/loongarch_ipi.h
index d4eebd9a4d..26076d8062 100644
--- a/include/hw/intc/loongarch_ipi.h
+++ b/include/hw/intc/loongarch_ipi.h
@@ -17,6 +17,7 @@ OBJECT_DECLARE_TYPE(LoongarchIPIState, LoongarchIPIClass, 
LOONGARCH_IPI)
 struct LoongarchIPIState {
     LoongsonIPICommonState parent_obj;
     bool irqchip_in_kernel;
+    int  dev_fd;
 };
 
 struct LoongarchIPIClass {
@@ -25,4 +26,6 @@ struct LoongarchIPIClass {
     ResettablePhases parent_phases;
 };
 
+void kvm_loongarch_ipi_realize(DeviceState *dev, Error **errp);
+
 #endif
-- 
2.39.3