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Message-ID: <CAAhV-H5h2LioH6SZD8RUNewb4De3LWM9g2PJFUnTTkX+GG4cdw@mail.gmail.com>
Date: Thu, 15 Jan 2026 15:43:51 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: Song Gao <gaosong@...ngson.cn>
Cc: maobibo@...ngson.cn, kvm@...r.kernel.org, loongarch@...ts.linux.dev,
kernel@...0n.name, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/2] LongArch: KVM: Add DMSINTC device support
Hi, Song,
On Thu, Dec 25, 2025 at 5:37 PM Song Gao <gaosong@...ngson.cn> wrote:
>
> Add device model for DMSINTC interrupt controller, implement basic
> create/destroy/set_attr interfaces, and register device model to kvm
> device table.
>
> Reviewed-by: Bibo Mao <maobibo@...ngson.cn>
> Signed-off-by: Song Gao <gaosong@...ngson.cn>
> ---
> arch/loongarch/include/asm/kvm_dmsintc.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/dmsintc.c | 110 +++++++++++++++++++++++
> arch/loongarch/kvm/main.c | 6 ++
> include/uapi/linux/kvm.h | 2 +
> 7 files changed, 147 insertions(+)
> create mode 100644 arch/loongarch/include/asm/kvm_dmsintc.h
> create mode 100644 arch/loongarch/kvm/intc/dmsintc.c
>
> diff --git a/arch/loongarch/include/asm/kvm_dmsintc.h b/arch/loongarch/include/asm/kvm_dmsintc.h
> new file mode 100644
> index 000000000000..1d4f66996f3c
> --- /dev/null
> +++ b/arch/loongarch/include/asm/kvm_dmsintc.h
> @@ -0,0 +1,21 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2025 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef __ASM_KVM_DMSINTC_H
> +#define __ASM_KVM_DMSINTC_H
> +
> +
> +struct loongarch_dmsintc {
> + struct kvm *kvm;
> + uint64_t msg_addr_base;
> + uint64_t msg_addr_size;
> +};
> +
> +struct dmsintc_state {
> + atomic64_t vector_map[4];
> +};
> +
> +int kvm_loongarch_register_dmsintc_device(void);
> +#endif
> diff --git a/arch/loongarch/include/asm/kvm_host.h b/arch/loongarch/include/asm/kvm_host.h
> index e4fe5b8e8149..5e9e2af7312f 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_dmsintc.h>
> #include <asm/loongarch.h>
>
> #define __KVM_HAVE_ARCH_INTC_INITIALIZED
> @@ -134,6 +135,7 @@ struct kvm_arch {
> struct loongarch_ipi *ipi;
> struct loongarch_eiointc *eiointc;
> struct loongarch_pch_pic *pch_pic;
> + struct loongarch_dmsintc *dmsintc;
> };
>
> #define CSR_MAX_NUMS 0x800
> @@ -244,6 +246,7 @@ struct kvm_vcpu_arch {
> struct kvm_mp_state mp_state;
> /* ipi state */
> struct ipi_state ipi_state;
> + struct dmsintc_state dmsintc_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..0a370d018b08 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_DMSINTC_CTRL 0x40000007
> +#define KVM_DEV_LOONGARCH_DMSINTC_MSG_ADDR_BASE 0x0
> +#define KVM_DEV_LOONGARCH_DMSINTC_MSG_ADDR_SIZE 0x1
> +
> #endif /* __UAPI_ASM_LOONGARCH_KVM_H */
> diff --git a/arch/loongarch/kvm/Makefile b/arch/loongarch/kvm/Makefile
> index cb41d9265662..6e184e24443c 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/dmsintc.o
> kvm-y += irqfd.o
>
> CFLAGS_exit.o += $(call cc-disable-warning, override-init)
> diff --git a/arch/loongarch/kvm/intc/dmsintc.c b/arch/loongarch/kvm/intc/dmsintc.c
> new file mode 100644
> index 000000000000..3fdea81a08c8
> --- /dev/null
> +++ b/arch/loongarch/kvm/intc/dmsintc.c
> @@ -0,0 +1,110 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2025 Loongson Technology Corporation Limited
> + */
> +
> +#include <linux/kvm_host.h>
> +#include <asm/kvm_dmsintc.h>
> +#include <asm/kvm_vcpu.h>
> +
> +static int kvm_dmsintc_ctrl_access(struct kvm_device *dev,
> + struct kvm_device_attr *attr,
> + bool is_write)
> +{
> + int addr = attr->attr;
> + void __user *data;
> + struct loongarch_dmsintc *s = dev->kvm->arch.dmsintc;
> + u64 tmp;
> +
> + data = (void __user *)attr->addr;
> + switch (addr) {
> + case KVM_DEV_LOONGARCH_DMSINTC_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 & (BIT(AVEC_CPU_SHIFT) - 1)) == 0)
> + s->msg_addr_base = tmp;
> + else
> + return -EFAULT;
> + }
> + break;
> + case KVM_DEV_LOONGARCH_DMSINTC_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 dmsintc register, addr = %d\n", __func__, addr);
> + return -ENXIO;
> + }
> +
> + return 0;
> +}
> +
> +static int kvm_dmsintc_set_attr(struct kvm_device *dev,
> + struct kvm_device_attr *attr)
> +{
> + switch (attr->group) {
> + case KVM_DEV_LOONGARCH_DMSINTC_CTRL:
> + return kvm_dmsintc_ctrl_access(dev, attr, true);
> + default:
> + kvm_err("%s: unknown group (%d)\n", __func__, attr->group);
> + return -EINVAL;
> + }
> +}
> +
> +static int kvm_dmsintc_create(struct kvm_device *dev, u32 type)
> +{
> + struct kvm *kvm;
> + struct loongarch_dmsintc *s;
> +
> + if (!dev) {
> + kvm_err("%s: kvm_device ptr is invalid!\n", __func__);
> + return -EINVAL;
> + }
> +
> + kvm = dev->kvm;
> + if (kvm->arch.dmsintc) {
> + kvm_err("%s: LoongArch DMSINTC has already been created!\n", __func__);
> + return -EINVAL;
> + }
> +
> + s = kzalloc(sizeof(struct loongarch_dmsintc), GFP_KERNEL);
> + if (!s)
> + return -ENOMEM;
> +
> + s->kvm = kvm;
> + kvm->arch.dmsintc = s;
> + return 0;
> +}
> +
> +static void kvm_dmsintc_destroy(struct kvm_device *dev)
> +{
> +
> + if (!dev || !dev->kvm || !dev->kvm->arch.dmsintc)
> + return;
> +
> + kfree(dev->kvm->arch.dmsintc);
No need to call kvm_io_bus_unregister_dev()? And it seems you need to
kfree(dev) if this series is correct:
https://lore.kernel.org/loongarch/99826cf9-356d-235b-9c7c-9d51d36e53c3@loongson.cn/T/#t
Huacai
> +}
> +
> +static struct kvm_device_ops kvm_dmsintc_dev_ops = {
> + .name = "kvm-loongarch-dmsintc",
> + .create = kvm_dmsintc_create,
> + .destroy = kvm_dmsintc_destroy,
> + .set_attr = kvm_dmsintc_set_attr,
> +};
> +
> +int kvm_loongarch_register_dmsintc_device(void)
> +{
> + return kvm_register_device_ops(&kvm_dmsintc_dev_ops, KVM_DEV_TYPE_LOONGARCH_DMSINTC);
> +}
> diff --git a/arch/loongarch/kvm/main.c b/arch/loongarch/kvm/main.c
> index 80ea63d465b8..f363a3b24903 100644
> --- a/arch/loongarch/kvm/main.c
> +++ b/arch/loongarch/kvm/main.c
> @@ -408,6 +408,12 @@ 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 DMSINTC interrupt contrroller interface */
> + if (cpu_has_msgint)
> + ret = kvm_loongarch_register_dmsintc_device();
>
> return ret;
> }
> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index dddb781b0507..7c56e7e36265 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -1209,6 +1209,8 @@ 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_DMSINTC,
> +#define KVM_DEV_TYPE_LOONGARCH_DMSINTC KVM_DEV_TYPE_LOONGARCH_DMSINTC
>
> KVM_DEV_TYPE_MAX,
>
> --
> 2.39.3
>
>
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