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// SPDX-License-Identifier: GPL-2.0
/*
* ACRN Hypervisor Service Module (HSM)
*
* Copyright (C) 2020 Intel Corporation. All rights reserved.
*
* Authors:
* Fengwei Yin <fengwei.yin@intel.com>
* Yakui Zhao <yakui.zhao@intel.com>
*/
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <asm/acrn.h>
#include <asm/hypervisor.h>
#include "acrn_drv.h"
/*
* When /dev/acrn_hsm is opened, a 'struct acrn_vm' object is created to
* represent a VM instance and continues to be associated with the opened file
* descriptor. All ioctl operations on this file descriptor will be targeted to
* the VM instance. Release of this file descriptor will destroy the object.
*/
static int acrn_dev_open(struct inode *inode, struct file *filp)
{
struct acrn_vm *vm;
vm = kzalloc(sizeof(*vm), GFP_KERNEL);
if (!vm)
return -ENOMEM;
vm->vmid = ACRN_INVALID_VMID;
filp->private_data = vm;
return 0;
}
/*
* HSM relies on hypercall layer of the ACRN hypervisor to do the
* sanity check against the input parameters.
*/
static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
unsigned long ioctl_param)
{
struct acrn_vm *vm = filp->private_data;
struct acrn_vm_creation *vm_param;
struct acrn_vcpu_regs *cpu_regs;
int i, ret = 0;
if (vm->vmid == ACRN_INVALID_VMID && cmd != ACRN_IOCTL_CREATE_VM) {
dev_dbg(acrn_dev.this_device,
"ioctl 0x%x: Invalid VM state!\n", cmd);
return -EINVAL;
}
switch (cmd) {
case ACRN_IOCTL_CREATE_VM:
vm_param = memdup_user((void __user *)ioctl_param,
sizeof(struct acrn_vm_creation));
if (IS_ERR(vm_param))
return PTR_ERR(vm_param);
if ((vm_param->reserved0 | vm_param->reserved1) != 0)
return -EINVAL;
vm = acrn_vm_create(vm, vm_param);
if (!vm) {
ret = -EINVAL;
kfree(vm_param);
break;
}
if (copy_to_user((void __user *)ioctl_param, vm_param,
sizeof(struct acrn_vm_creation))) {
acrn_vm_destroy(vm);
ret = -EFAULT;
}
kfree(vm_param);
break;
case ACRN_IOCTL_START_VM:
ret = hcall_start_vm(vm->vmid);
if (ret < 0)
dev_dbg(acrn_dev.this_device,
"Failed to start VM %u!\n", vm->vmid);
break;
case ACRN_IOCTL_PAUSE_VM:
ret = hcall_pause_vm(vm->vmid);
if (ret < 0)
dev_dbg(acrn_dev.this_device,
"Failed to pause VM %u!\n", vm->vmid);
break;
case ACRN_IOCTL_RESET_VM:
ret = hcall_reset_vm(vm->vmid);
if (ret < 0)
dev_dbg(acrn_dev.this_device,
"Failed to restart VM %u!\n", vm->vmid);
break;
case ACRN_IOCTL_DESTROY_VM:
ret = acrn_vm_destroy(vm);
break;
case ACRN_IOCTL_SET_VCPU_REGS:
cpu_regs = memdup_user((void __user *)ioctl_param,
sizeof(struct acrn_vcpu_regs));
if (IS_ERR(cpu_regs))
return PTR_ERR(cpu_regs);
for (i = 0; i < ARRAY_SIZE(cpu_regs->reserved); i++)
if (cpu_regs->reserved[i])
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(cpu_regs->vcpu_regs.reserved_32); i++)
if (cpu_regs->vcpu_regs.reserved_32[i])
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(cpu_regs->vcpu_regs.reserved_64); i++)
if (cpu_regs->vcpu_regs.reserved_64[i])
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(cpu_regs->vcpu_regs.gdt.reserved); i++)
if (cpu_regs->vcpu_regs.gdt.reserved[i] |
cpu_regs->vcpu_regs.idt.reserved[i])
return -EINVAL;
ret = hcall_set_vcpu_regs(vm->vmid, virt_to_phys(cpu_regs));
if (ret < 0)
dev_dbg(acrn_dev.this_device,
"Failed to set regs state of VM%u!\n",
vm->vmid);
kfree(cpu_regs);
break;
default:
dev_dbg(acrn_dev.this_device, "Unknown IOCTL 0x%x!\n", cmd);
ret = -ENOTTY;
}
return ret;
}
static int acrn_dev_release(struct inode *inode, struct file *filp)
{
struct acrn_vm *vm = filp->private_data;
acrn_vm_destroy(vm);
kfree(vm);
return 0;
}
static const struct file_operations acrn_fops = {
.owner = THIS_MODULE,
.open = acrn_dev_open,
.release = acrn_dev_release,
.unlocked_ioctl = acrn_dev_ioctl,
};
struct miscdevice acrn_dev = {
.minor = MISC_DYNAMIC_MINOR,
.name = "acrn_hsm",
.fops = &acrn_fops,
};
static int __init hsm_init(void)
{
int ret;
if (x86_hyper_type != X86_HYPER_ACRN)
return -ENODEV;
if (!(cpuid_eax(ACRN_CPUID_FEATURES) & ACRN_FEATURE_PRIVILEGED_VM))
return -EPERM;
ret = misc_register(&acrn_dev);
if (ret)
pr_err("Create misc dev failed!\n");
return ret;
}
static void __exit hsm_exit(void)
{
misc_deregister(&acrn_dev);
}
module_init(hsm_init);
module_exit(hsm_exit);
MODULE_AUTHOR("Intel Corporation");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ACRN Hypervisor Service Module (HSM)");
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