hw/intc/loongarch_pch: Add kernel irqchip realize function

Function kvm_pic_realize() is added if kvm_irqchip_in_kernel() return true.
It is to notify KVM kernel to create and initialize PCH PCI device in
kernel mode.

Reviewed-by: Song Gao <gaosong@loongson.cn>
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Message-ID: <20250606063033.2557365-8-maobibo@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>

hw/intc/loongarch_pch_pic.c

@@ -10,6 +10,7 @@
 #include "qemu/log.h"
 #include "hw/irq.h"
 #include "hw/intc/loongarch_pch_pic.h"
+#include "system/kvm.h"
 #include "trace.h"
 #include "qapi/error.h"
 
@@ -275,10 +276,15 @@ static void loongarch_pic_realize(DeviceState *dev, Error **errp)
 
     qdev_init_gpio_out(dev, s->parent_irq, s->irq_num);
     qdev_init_gpio_in(dev, pch_pic_irq_handler, s->irq_num);
-    memory_region_init_io(&s->iomem, OBJECT(dev),
-                          &loongarch_pch_pic_ops,
-                          s, TYPE_LOONGARCH_PIC, VIRT_PCH_REG_SIZE);
-    sysbus_init_mmio(sbd, &s->iomem);
+
+    if (kvm_irqchip_in_kernel()) {
+        kvm_pic_realize(dev, errp);
+    } else {
+        memory_region_init_io(&s->iomem, OBJECT(dev),
+                              &loongarch_pch_pic_ops,
+                              s, TYPE_LOONGARCH_PIC, VIRT_PCH_REG_SIZE);
+        sysbus_init_mmio(sbd, &s->iomem);
+    }
 }
 
 static void loongarch_pic_class_init(ObjectClass *klass, const void *data)

hw/intc/loongarch_pic_kvm.c

@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * LoongArch kvm pch pic interrupt support
+ *
+ * Copyright (C) 2025 Loongson Technology Corporation Limited
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "hw/boards.h"
+#include "hw/intc/loongarch_pch_pic.h"
+#include "hw/loongarch/virt.h"
+#include "hw/pci-host/ls7a.h"
+#include "system/kvm.h"
+
+void kvm_pic_realize(DeviceState *dev, Error **errp)
+{
+    LoongarchPICState *lps = LOONGARCH_PIC(dev);
+    uint64_t pch_pic_base = VIRT_PCH_REG_BASE;
+    int ret;
+
+    ret = kvm_create_device(kvm_state, KVM_DEV_TYPE_LOONGARCH_PCHPIC, false);
+    if (ret < 0) {
+        fprintf(stderr, "Create KVM_LOONGARCH_PCHPIC failed: %s\n",
+                strerror(-ret));
+        abort();
+    }
+
+    lps->dev_fd = ret;
+    ret = kvm_device_access(lps->dev_fd, KVM_DEV_LOONGARCH_PCH_PIC_GRP_CTRL,
+                            KVM_DEV_LOONGARCH_PCH_PIC_CTRL_INIT,
+                            &pch_pic_base, true, NULL);
+    if (ret < 0) {
+        fprintf(stderr, "KVM_LOONGARCH_PCH_PIC_INIT failed: %s\n",
+                strerror(-ret));
+        abort();
+    }
+}

hw/intc/meson.build

@@ -74,6 +74,8 @@ 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_KVM', 'CONFIG_LOONGARCH_PCH_PIC'],
+                if_true: files('loongarch_pic_kvm.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'))
 specific_ss.add(when: ['CONFIG_KVM', 'CONFIG_LOONGARCH_EXTIOI'],

include/hw/intc/loongarch_pch_pic.h

@@ -16,6 +16,7 @@ OBJECT_DECLARE_TYPE(LoongarchPICState, LoongarchPICClass, LOONGARCH_PIC)
 
 struct LoongarchPICState {
     LoongArchPICCommonState parent_obj;
+    int dev_fd;
 };
 
 struct LoongarchPICClass {
@@ -25,4 +26,6 @@ struct LoongarchPICClass {
     ResettablePhases parent_phases;
 };
 
+void kvm_pic_realize(DeviceState *dev, Error **errp);
+
 #endif /* HW_LOONGARCH_PCH_PIC_H */