Add device model for AVEC interrupt controller, implement basic
create/destroy/set_attr interfaces, and register device model to kvm
device table.

Signed-off-by: Song Gao <gaosong@loongson.cn>
---
 arch/loongarch/include/asm/kvm_dintc.h |  21 +++++
 arch/loongarch/include/asm/kvm_host.h  |   3 +
 arch/loongarch/include/uapi/asm/kvm.h  |   4 +
 arch/loongarch/kvm/Makefile            |   1 +
 arch/loongarch/kvm/intc/dintc.c        | 112 +++++++++++++++++++++++++
 arch/loongarch/kvm/main.c              |   5 ++
 include/uapi/linux/kvm.h               |   2 +
 7 files changed, 148 insertions(+)
 create mode 100644 arch/loongarch/include/asm/kvm_dintc.h
 create mode 100644 arch/loongarch/kvm/intc/dintc.c

diff --git a/arch/loongarch/include/asm/kvm_dintc.h b/arch/loongarch/include/asm/kvm_dintc.h
new file mode 100644
index 000000000000..d980d39c0344
--- /dev/null
+++ b/arch/loongarch/include/asm/kvm_dintc.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2025 Loongson Technology Corporation Limited
+ */
+
+#ifndef __ASM_KVM_DINTC_H
+#define __ASM_KVM_DINTC_H
+
+
+struct loongarch_dintc  {
+	struct kvm *kvm;
+	uint64_t msg_addr_base;
+	uint64_t msg_addr_size;
+};
+
+struct dintc_state {
+	atomic64_t  vector_map[4];
+};
+
+int kvm_loongarch_register_dintc_device(void);
+#endif
diff --git a/arch/loongarch/include/asm/kvm_host.h b/arch/loongarch/include/asm/kvm_host.h
index 0cecbd038bb3..7f6c4e7d241e 100644
--- a/arch/loongarch/include/asm/kvm_host.h
+++ b/arch/loongarch/include/asm/kvm_host.h
@@ -22,6 +22,7 @@
 #include <asm/kvm_ipi.h>
 #include <asm/kvm_eiointc.h>
 #include <asm/kvm_pch_pic.h>
+#include <asm/kvm_dintc.h>
 #include <asm/loongarch.h>
 
 #define __KVM_HAVE_ARCH_INTC_INITIALIZED
@@ -132,6 +133,7 @@ struct kvm_arch {
 	struct loongarch_ipi *ipi;
 	struct loongarch_eiointc *eiointc;
 	struct loongarch_pch_pic *pch_pic;
+	struct loongarch_dintc *dintc;
 };
 
 #define CSR_MAX_NUMS		0x800
@@ -242,6 +244,7 @@ struct kvm_vcpu_arch {
 	struct kvm_mp_state mp_state;
 	/* ipi state */
 	struct ipi_state ipi_state;
+	struct dintc_state dintc_state;
 	/* cpucfg */
 	u32 cpucfg[KVM_MAX_CPUCFG_REGS];
 
diff --git a/arch/loongarch/include/uapi/asm/kvm.h b/arch/loongarch/include/uapi/asm/kvm.h
index de6c3f18e40a..07da84f7002c 100644
--- a/arch/loongarch/include/uapi/asm/kvm.h
+++ b/arch/loongarch/include/uapi/asm/kvm.h
@@ -154,4 +154,8 @@ 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/arch/loongarch/kvm/Makefile b/arch/loongarch/kvm/Makefile
index cb41d9265662..fe984bf1cbdb 100644
--- a/arch/loongarch/kvm/Makefile
+++ b/arch/loongarch/kvm/Makefile
@@ -19,6 +19,7 @@ kvm-y += vm.o
 kvm-y += intc/ipi.o
 kvm-y += intc/eiointc.o
 kvm-y += intc/pch_pic.o
+kvm-y += intc/dintc.o
 kvm-y += irqfd.o
 
 CFLAGS_exit.o	+= $(call cc-disable-warning, override-init)
diff --git a/arch/loongarch/kvm/intc/dintc.c b/arch/loongarch/kvm/intc/dintc.c
new file mode 100644
index 000000000000..d30616ded1b1
--- /dev/null
+++ b/arch/loongarch/kvm/intc/dintc.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2025 Loongson Technology Corporation Limited
+ */
+
+#include <linux/kvm_host.h>
+#include <asm/kvm_dintc.h>
+#include <asm/kvm_vcpu.h>
+
+static int kvm_dintc_ctrl_access(struct kvm_device *dev,
+				struct kvm_device_attr *attr,
+				bool is_write)
+{
+	int addr = attr->attr;
+	void __user *data;
+	struct loongarch_dintc *s = dev->kvm->arch.dintc;
+	u64 tmp;
+
+	data = (void __user *)attr->addr;
+	switch (addr) {
+	case KVM_DEV_LOONGARCH_DINTC_MSG_ADDR_BASE:
+		if (is_write) {
+			if (copy_from_user(&tmp, data, sizeof(s->msg_addr_base)))
+				return -EFAULT;
+			if (s->msg_addr_base) {
+				/* Duplicate setting are not allowed. */
+				return -EFAULT;
+			}
+			if (tmp > (1UL << AVEC_CPU_SHIFT))
+				s->msg_addr_base = tmp;
+			else
+				return  -EFAULT;
+		}
+		break;
+	case KVM_DEV_LOONGARCH_DINTC_MSG_ADDR_SIZE:
+		if (is_write) {
+			if (copy_from_user(&tmp, data, sizeof(s->msg_addr_size)))
+				return -EFAULT;
+			if (s->msg_addr_size) {
+				/*Duplicate setting are not allowed. */
+				return -EFAULT;
+			}
+			s->msg_addr_size = tmp;
+		}
+		break;
+	default:
+		kvm_err("%s: unknown dintc register, addr = %d\n", __func__, addr);
+		return -ENXIO;
+	}
+
+	return 0;
+}
+
+static int kvm_dintc_set_attr(struct kvm_device *dev,
+			struct kvm_device_attr *attr)
+{
+	switch (attr->group) {
+	case KVM_DEV_LOONGARCH_DINTC_CTRL:
+		return kvm_dintc_ctrl_access(dev, attr, true);
+	default:
+		kvm_err("%s: unknown group (%d)\n", __func__, attr->group);
+		return -EINVAL;
+	}
+}
+
+static int kvm_dintc_create(struct kvm_device *dev, u32 type)
+{
+	struct kvm *kvm;
+	struct loongarch_dintc *s;
+
+	if (!dev) {
+		kvm_err("%s: kvm_device ptr is invalid!\n", __func__);
+		return -EINVAL;
+	}
+
+	kvm = dev->kvm;
+	if (kvm->arch.dintc) {
+		kvm_err("%s: LoongArch DINTC has already been created!\n", __func__);
+		return -EINVAL;
+	}
+
+	s = kzalloc(sizeof(struct loongarch_dintc), GFP_KERNEL);
+	if (!s)
+		return -ENOMEM;
+
+	s->kvm = kvm;
+	kvm->arch.dintc = s;
+	return 0;
+}
+
+static void kvm_dintc_destroy(struct kvm_device *dev)
+{
+	struct kvm *kvm;
+	struct loongarch_dintc *dintc;
+
+	if (!dev || !dev->kvm || !dev->kvm->arch.dintc)
+		return;
+
+	kfree(dev->kvm->arch.dintc);
+}
+
+static struct kvm_device_ops kvm_dintc_dev_ops = {
+	.name = "kvm-loongarch-dintc",
+	.create = kvm_dintc_create,
+	.destroy = kvm_dintc_destroy,
+	.set_attr = kvm_dintc_set_attr,
+};
+
+int kvm_loongarch_register_dintc_device(void)
+{
+	return kvm_register_device_ops(&kvm_dintc_dev_ops, KVM_DEV_TYPE_LOONGARCH_DINTC);
+}
diff --git a/arch/loongarch/kvm/main.c b/arch/loongarch/kvm/main.c
index 80ea63d465b8..d18d9f4d485c 100644
--- a/arch/loongarch/kvm/main.c
+++ b/arch/loongarch/kvm/main.c
@@ -408,6 +408,11 @@ static int kvm_loongarch_env_init(void)
 
 	/* Register LoongArch PCH-PIC interrupt controller interface. */
 	ret = kvm_loongarch_register_pch_pic_device();
+	if (ret)
+		return ret;
+
+	/* Register LoongArch DINTC interrupt contrroller interface */
+	ret = kvm_loongarch_register_dintc_device();
 
 	return ret;
 }
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 52f6000ab020..497a48235bf8 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1198,6 +1198,8 @@ 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,
 
-- 
2.39.3

Hi Song,

kernel test robot noticed the following build warnings:

[auto build test WARNING on next-20251128]
[also build test WARNING on v6.18]
[cannot apply to kvm/queue kvm/next tip/irq/core mst-vhost/linux-next linus/master kvm/linux-next v6.18-rc7 v6.18-rc6 v6.18-rc5]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Song-Gao/LongArch-KVM-Add-some-maccros-for-AVEC/20251128-173944
base:   next-20251128
patch link:    https://lore.kernel.org/r/20251128091125.2720148-3-gaosong%40loongson.cn
patch subject: [PATCH v2 2/4] LongArch: KVM: Add DINTC device support
config: loongarch-allmodconfig (https://download.01.org/0day-ci/archive/20251201/202512011848.uhe7LBBn-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251201/202512011848.uhe7LBBn-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512011848.uhe7LBBn-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/loongarch/kvm/intc/dintc.c:93:14: warning: unused variable 'kvm' [-Wunused-variable]
      93 |         struct kvm *kvm;
         |                     ^~~
>> arch/loongarch/kvm/intc/dintc.c:94:26: warning: unused variable 'dintc' [-Wunused-variable]
      94 |         struct loongarch_dintc *dintc;
         |                                 ^~~~~
   2 warnings generated.


vim +/kvm +93 arch/loongarch/kvm/intc/dintc.c

    90	
    91	static void kvm_dintc_destroy(struct kvm_device *dev)
    92	{
  > 93		struct kvm *kvm;
  > 94		struct loongarch_dintc *dintc;
    95	
    96		if (!dev || !dev->kvm || !dev->kvm->arch.dintc)
    97			return;
    98	
    99		kfree(dev->kvm->arch.dintc);
   100	}
   101	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki