From nobody Sun Apr 5 16:31:15 2026 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 8DA273CD8CC; Thu, 2 Apr 2026 13:08:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.242.206.163 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775135305; cv=none; b=cbiBfKaVneIRnOY4242wNAwCR71nDUcF4jFK4/I7R/YuNXZntQ71Ih3DGPGOwy22tixgea1HuudOzrwLesM3tX+gxIjaL/de0nt9fK4dlOha7A49DyC5xduSL9O2UVoP98o6qc5+vc0LVx6TXzvWppxtzfbPjRCEOTRPmkYnCp0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775135305; c=relaxed/simple; bh=0pzuAWzpVngTq7uFimeChvbs2L1mwTDF67Lt+JPnBPo=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=AeWe7aYLzrXV3z23aE2Xg2ywCvoKIwBgw2mcME2XkqW/N6UBX1fgvy9WyiZaAzkpfbjwuEXKPKW702WwvgyBOqPzT4LGwI9/MpOfMVGXOaDRvJG7pNggItmnA9DoWBLT7jCsbIPEeEGq1b614UjKMMPmrDlfC45eAm3pF0UspNU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn; spf=pass smtp.mailfrom=loongson.cn; arc=none smtp.client-ip=114.242.206.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=loongson.cn Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8AxgsA_as5pSDchAA--.34768S3; Thu, 02 Apr 2026 21:08:15 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by front1 (Coremail) with SMTP id qMiowJCx+8E6as5p6oJjAA--.58940S3; Thu, 02 Apr 2026 21:08:14 +0800 (CST) From: Song Gao To: maobibo@loongson.cn, chenhuacai@kernel.org Cc: kvm@vger.kernel.org, loongarch@lists.linux.dev, kernel@xen0n.name, linux-kernel@vger.kernel.org, lixianglai@loongson.cn Subject: [PATCH v9 1/2] LoongArch: KVM: Add DMSINTC device support Date: Thu, 2 Apr 2026 20:42:36 +0800 Message-Id: <20260402124237.4174550-2-gaosong@loongson.cn> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20260402124237.4174550-1-gaosong@loongson.cn> References: <20260402124237.4174550-1-gaosong@loongson.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: qMiowJCx+8E6as5p6oJjAA--.58940S3 X-CM-SenderInfo: 5jdr20tqj6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Content-Type: text/plain; charset="utf-8" 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 Signed-off-by: Song Gao --- 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 | 117 +++++++++++++++++++++++ arch/loongarch/kvm/main.c | 6 ++ include/uapi/linux/kvm.h | 2 + 7 files changed, 154 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/incl= ude/asm/kvm_dmsintc.h new file mode 100644 index 000000000000..b04b89dd2a35 --- /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 19eb5e5c3984..6a8d72cf8e4e 100644 --- a/arch/loongarch/include/asm/kvm_host.h +++ b/arch/loongarch/include/asm/kvm_host.h @@ -22,6 +22,7 @@ #include #include #include +#include #include =20 #define __KVM_HAVE_ARCH_INTC_INITIALIZED @@ -135,6 +136,7 @@ struct kvm_arch { struct loongarch_ipi *ipi; struct loongarch_eiointc *eiointc; struct loongarch_pch_pic *pch_pic; + struct loongarch_dmsintc *dmsintc; }; =20 #define CSR_MAX_NUMS 0x800 @@ -247,6 +249,7 @@ 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]; =20 diff --git a/arch/loongarch/include/uapi/asm/kvm.h b/arch/loongarch/include= /uapi/asm/kvm.h index 419647aacdf3..c39b8ac7a90a 100644 --- a/arch/loongarch/include/uapi/asm/kvm.h +++ b/arch/loongarch/include/uapi/asm/kvm.h @@ -155,4 +155,8 @@ struct kvm_iocsr_entry { #define KVM_DEV_LOONGARCH_PCH_PIC_GRP_CTRL 0x40000006 #define KVM_DEV_LOONGARCH_PCH_PIC_CTRL_INIT 0 =20 +#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 +=3D vm.o kvm-y +=3D intc/ipi.o kvm-y +=3D intc/eiointc.o kvm-y +=3D intc/pch_pic.o +kvm-y +=3D intc/dmsintc.o kvm-y +=3D irqfd.o =20 CFLAGS_exit.o +=3D $(call cc-disable-warning, override-init) diff --git a/arch/loongarch/kvm/intc/dmsintc.c b/arch/loongarch/kvm/intc/dm= sintc.c new file mode 100644 index 000000000000..1bb61e55d061 --- /dev/null +++ b/arch/loongarch/kvm/intc/dmsintc.c @@ -0,0 +1,117 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2025 Loongson Technology Corporation Limited + */ + +#include +#include +#include + +static int kvm_dmsintc_ctrl_access(struct kvm_device *dev, + struct kvm_device_attr *attr, + bool is_write) +{ + int addr =3D attr->attr; + void __user *data; + struct loongarch_dmsintc *s =3D dev->kvm->arch.dmsintc; + u64 tmp; + u32 cpu_bit; + + data =3D (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)) =3D=3D 0) + s->msg_addr_base =3D tmp; + else + return -EFAULT; + s->msg_addr_base =3D tmp; + cpu_bit =3D find_first_bit((unsigned long *)&(s->msg_addr_base), 64) + - AVEC_CPU_SHIFT; + cpu_bit =3D min(cpu_bit, AVEC_CPU_BIT); + s->cpu_mask =3D GENMASK(cpu_bit - 1, 0) & AVEC_CPU_MASK; + } + 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 =3D tmp; + } + break; + default: + kvm_err("%s: unknown dmsintc register, addr =3D %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 =3D dev->kvm; + if (kvm->arch.dmsintc) { + kvm_err("%s: LoongArch DMSINTC has already been created!\n", __func__); + return -EINVAL; + } + + s =3D kzalloc(sizeof(struct loongarch_dmsintc), GFP_KERNEL); + if (!s) + return -ENOMEM; + + s->kvm =3D kvm; + kvm->arch.dmsintc =3D 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); + kfree(dev); +} + +static struct kvm_device_ops kvm_dmsintc_dev_ops =3D { + .name =3D "kvm-loongarch-dmsintc", + .create =3D kvm_dmsintc_create, + .destroy =3D kvm_dmsintc_destroy, + .set_attr =3D kvm_dmsintc_set_attr, +}; + +int kvm_loongarch_register_dmsintc_device(void) +{ + return kvm_register_device_ops(&kvm_dmsintc_dev_ops, KVM_DEV_TYPE_LOONGAR= CH_DMSINTC); +} diff --git a/arch/loongarch/kvm/main.c b/arch/loongarch/kvm/main.c index 2c593ac7892f..713771a93d90 100644 --- a/arch/loongarch/kvm/main.c +++ b/arch/loongarch/kvm/main.c @@ -416,6 +416,12 @@ static int kvm_loongarch_env_init(void) =20 /* Register LoongArch PCH-PIC interrupt controller interface. */ ret =3D kvm_loongarch_register_pch_pic_device(); + if (ret) + return ret; + + /* Register LoongArch DMSINTC interrupt contrroller interface */ + if (cpu_has_msgint) + ret =3D kvm_loongarch_register_dmsintc_device(); =20 return ret; } diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 80364d4dbebb..0c940fbcee8b 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1224,6 +1224,8 @@ 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 =20 KVM_DEV_TYPE_MAX, =20 --=20 2.39.3