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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2024 Loongson Technology Corporation Limited
*/
#include <linux/kvm_host.h>
#include <asm/kvm_ipi.h>
#include <asm/kvm_vcpu.h>
static int kvm_ipi_read(struct kvm_vcpu *vcpu,
struct kvm_io_device *dev,
gpa_t addr, int len, void *val)
{
return 0;
}
static int kvm_ipi_write(struct kvm_vcpu *vcpu,
struct kvm_io_device *dev,
gpa_t addr, int len, const void *val)
{
return 0;
}
static const struct kvm_io_device_ops kvm_ipi_ops = {
.read = kvm_ipi_read,
.write = kvm_ipi_write,
};
static int kvm_ipi_get_attr(struct kvm_device *dev,
struct kvm_device_attr *attr)
{
return 0;
}
static int kvm_ipi_set_attr(struct kvm_device *dev,
struct kvm_device_attr *attr)
{
return 0;
}
static int kvm_ipi_create(struct kvm_device *dev, u32 type)
{
int ret;
struct kvm *kvm;
struct kvm_io_device *device;
struct loongarch_ipi *s;
if (!dev) {
kvm_err("%s: kvm_device ptr is invalid!\n", __func__);
return -EINVAL;
}
kvm = dev->kvm;
if (kvm->arch.ipi) {
kvm_err("%s: LoongArch IPI has already been created!\n", __func__);
return -EINVAL;
}
s = kzalloc(sizeof(struct loongarch_ipi), GFP_KERNEL);
if (!s)
return -ENOMEM;
spin_lock_init(&s->lock);
s->kvm = kvm;
/*
* Initialize IOCSR device
*/
device = &s->device;
kvm_iodevice_init(device, &kvm_ipi_ops);
mutex_lock(&kvm->slots_lock);
ret = kvm_io_bus_register_dev(kvm, KVM_IOCSR_BUS, IOCSR_IPI_BASE, IOCSR_IPI_SIZE, device);
mutex_unlock(&kvm->slots_lock);
if (ret < 0) {
kvm_err("%s: Initialize IOCSR dev failed, ret = %d\n", __func__, ret);
goto err;
}
kvm->arch.ipi = s;
return 0;
err:
kfree(s);
return -EFAULT;
}
static void kvm_ipi_destroy(struct kvm_device *dev)
{
struct kvm *kvm;
struct loongarch_ipi *ipi;
if (!dev || !dev->kvm || !dev->kvm->arch.ipi)
return;
kvm = dev->kvm;
ipi = kvm->arch.ipi;
kvm_io_bus_unregister_dev(kvm, KVM_IOCSR_BUS, &ipi->device);
kfree(ipi);
}
static struct kvm_device_ops kvm_ipi_dev_ops = {
.name = "kvm-loongarch-ipi",
.create = kvm_ipi_create,
.destroy = kvm_ipi_destroy,
.set_attr = kvm_ipi_set_attr,
.get_attr = kvm_ipi_get_attr,
};
int kvm_loongarch_register_ipi_device(void)
{
return kvm_register_device_ops(&kvm_ipi_dev_ops, KVM_DEV_TYPE_LOONGARCH_IPI);
}
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