linux-kernel - [PATCH 04/11] LoongArch: KVM: Add IPI user mode read and write function

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Message-Id: <20240705023854.1005258-5-lixianglai@loongson.cn>
Date: Fri,  5 Jul 2024 10:38:47 +0800
From: Xianglai Li <lixianglai@...ngson.cn>
To: linux-kernel@...r.kernel.org
Cc: Min Zhou <zhoumin@...ngson.cn>,
	Tianrui Zhao <zhaotianrui@...ngson.cn>,
	Bibo Mao <maobibo@...ngson.cn>,
	Huacai Chen <chenhuacai@...nel.org>,
	kvm@...r.kernel.org,
	loongarch@...ts.linux.dev,
	Paolo Bonzini <pbonzini@...hat.com>,
	WANG Xuerui <kernel@...0n.name>,
	Xianglai li <lixianglai@...ngson.cn>
Subject: [PATCH 04/11] LoongArch: KVM: Add IPI user mode read and write function

Implements the communication interface between the user mode
program and the kernel in IPI interrupt control simulation,
which is used to obtain or send the simulation data of the
interrupt controller in the user mode process, and is used
in VM migration or VM saving and restoration.

Signed-off-by: Min Zhou <zhoumin@...ngson.cn>
Signed-off-by: Tianrui Zhao <zhaotianrui@...ngson.cn>
Signed-off-by: Xianglai Li <lixianglai@...ngson.cn>
---
Cc: Bibo Mao <maobibo@...ngson.cn> 
Cc: Huacai Chen <chenhuacai@...nel.org> 
Cc: kvm@...r.kernel.org 
Cc: loongarch@...ts.linux.dev 
Cc: Min Zhou <zhoumin@...ngson.cn> 
Cc: Paolo Bonzini <pbonzini@...hat.com> 
Cc: Tianrui Zhao <zhaotianrui@...ngson.cn> 
Cc: WANG Xuerui <kernel@...0n.name> 
Cc: Xianglai li <lixianglai@...ngson.cn> 

 arch/loongarch/include/uapi/asm/kvm.h |  2 +
 arch/loongarch/kvm/intc/ipi.c         | 91 ++++++++++++++++++++++++++-
 2 files changed, 91 insertions(+), 2 deletions(-)

diff --git a/arch/loongarch/include/uapi/asm/kvm.h b/arch/loongarch/include/uapi/asm/kvm.h
index f9abef382317..ec39a3cd4f22 100644
--- a/arch/loongarch/include/uapi/asm/kvm.h
+++ b/arch/loongarch/include/uapi/asm/kvm.h
@@ -108,4 +108,6 @@ struct kvm_iocsr_entry {
 #define KVM_IRQCHIP_NUM_PINS	64
 #define KVM_MAX_CORES		256
 
+#define KVM_DEV_LOONGARCH_IPI_GRP_REGS		1
+
 #endif /* __UAPI_ASM_LOONGARCH_KVM_H */
diff --git a/arch/loongarch/kvm/intc/ipi.c b/arch/loongarch/kvm/intc/ipi.c
index 815858671005..fbf6f7e462cf 100644
--- a/arch/loongarch/kvm/intc/ipi.c
+++ b/arch/loongarch/kvm/intc/ipi.c
@@ -320,16 +320,103 @@ static const struct kvm_io_device_ops kvm_loongarch_mail_ops = {
 	.write	= kvm_loongarch_mail_write,
 };
 
+static int kvm_loongarch_ipi_regs_access(struct kvm_device *dev,
+				struct kvm_device_attr *attr,
+				bool is_write)
+{
+	uint64_t val;
+	int cpu, addr;
+	void *p = NULL;
+	int len = 4;
+	struct kvm_vcpu *vcpu;
+
+	cpu = (attr->attr >> 16) & 0x3ff;
+	addr = attr->attr & 0xff;
+
+	vcpu = kvm_get_vcpu(dev->kvm, cpu);
+	if (unlikely(vcpu == NULL)) {
+		kvm_err("%s: invalid target cpu: %d\n", __func__, cpu);
+		return -EINVAL;
+	}
+	switch (addr) {
+	case CORE_STATUS_OFF:
+		p = &vcpu->arch.ipi_state.status;
+		break;
+	case CORE_EN_OFF:
+		p = &vcpu->arch.ipi_state.en;
+		break;
+	case CORE_SET_OFF:
+		p = &vcpu->arch.ipi_state.set;
+		break;
+	case CORE_CLEAR_OFF:
+		p = &vcpu->arch.ipi_state.clear;
+		break;
+	case CORE_BUF_20:
+		p = &vcpu->arch.ipi_state.buf[0];
+		len = 8;
+		break;
+	case CORE_BUF_28:
+		p = &vcpu->arch.ipi_state.buf[1];
+		len = 8;
+		break;
+	case CORE_BUF_30:
+		p = &vcpu->arch.ipi_state.buf[2];
+		len = 8;
+		break;
+	case CORE_BUF_38:
+		p = &vcpu->arch.ipi_state.buf[3];
+		len = 8;
+		break;
+	default:
+		kvm_err("%s: unknown ipi register, addr = %d\n", __func__, addr);
+		return -EINVAL;
+	}
+
+	if (is_write) {
+		if (len == 4) {
+			if (get_user(val, (uint32_t __user *)attr->addr))
+				return -EFAULT;
+			*(uint32_t *)p = (uint32_t)val;
+		} else if (len == 8) {
+			if (get_user(val, (uint64_t __user *)attr->addr))
+				return -EFAULT;
+			*(uint64_t *)p = val;
+		}
+	} else {
+		if (len == 4) {
+			val = *(uint32_t *)p;
+			return put_user(val, (uint32_t __user *)attr->addr);
+		} else if (len == 8) {
+			val = *(uint64_t *)p;
+			return put_user(val, (uint64_t __user *)attr->addr);
+		}
+	}
+
+	return 0;
+}
+
 static int kvm_loongarch_ipi_get_attr(struct kvm_device *dev,
 			struct kvm_device_attr *attr)
 {
-	return 0;
+	switch (attr->group) {
+	case KVM_DEV_LOONGARCH_IPI_GRP_REGS:
+		return kvm_loongarch_ipi_regs_access(dev, attr, false);
+	default:
+		kvm_err("%s: unknown group (%d)\n", __func__, attr->group);
+		return -EINVAL;
+	}
 }
 
 static int kvm_loongarch_ipi_set_attr(struct kvm_device *dev,
 			struct kvm_device_attr *attr)
 {
-	return 0;
+	switch (attr->group) {
+	case KVM_DEV_LOONGARCH_IPI_GRP_REGS:
+		return kvm_loongarch_ipi_regs_access(dev, attr, true);
+	default:
+		kvm_err("%s: unknown group (%d)\n", __func__, attr->group);
+		return -EINVAL;
+	}
 }
 
 static void kvm_loongarch_ipi_destroy(struct kvm_device *dev)
-- 
2.39.1