// 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/cpu.h>
#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;
}
static int pmcmd_ioctl(u64 cmd, void __user *uptr)
{
struct acrn_pstate_data *px_data;
struct acrn_cstate_data *cx_data;
u64 *pm_info;
int ret = 0;
switch (cmd & PMCMD_TYPE_MASK) {
case ACRN_PMCMD_GET_PX_CNT:
case ACRN_PMCMD_GET_CX_CNT:
pm_info = kmalloc(sizeof(u64), GFP_KERNEL);
if (!pm_info)
return -ENOMEM;
ret = hcall_get_cpu_state(cmd, virt_to_phys(pm_info));
if (ret < 0) {
kfree(pm_info);
break;
}
if (copy_to_user(uptr, pm_info, sizeof(u64)))
ret = -EFAULT;
kfree(pm_info);
break;
case ACRN_PMCMD_GET_PX_DATA:
px_data = kmalloc(sizeof(*px_data), GFP_KERNEL);
if (!px_data)
return -ENOMEM;
ret = hcall_get_cpu_state(cmd, virt_to_phys(px_data));
if (ret < 0) {
kfree(px_data);
break;
}
if (copy_to_user(uptr, px_data, sizeof(*px_data)))
ret = -EFAULT;
kfree(px_data);
break;
case ACRN_PMCMD_GET_CX_DATA:
cx_data = kmalloc(sizeof(*cx_data), GFP_KERNEL);
if (!cx_data)
return -ENOMEM;
ret = hcall_get_cpu_state(cmd, virt_to_phys(cx_data));
if (ret < 0) {
kfree(cx_data);
break;
}
if (copy_to_user(uptr, cx_data, sizeof(*cx_data)))
ret = -EFAULT;
kfree(cx_data);
break;
default:
break;
}
return ret;
}
/*
* 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;
struct acrn_ioreq_notify notify;
struct acrn_ptdev_irq *irq_info;
struct acrn_ioeventfd ioeventfd;
struct acrn_vm_memmap memmap;
struct acrn_mmiodev *mmiodev;
struct acrn_msi_entry *msi;
struct acrn_pcidev *pcidev;
struct acrn_irqfd irqfd;
struct acrn_vdev *vdev;
struct page *page;
u64 cstate_cmd;
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) {
kfree(vm_param);
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]) {
kfree(cpu_regs);
return -EINVAL;
}
for (i = 0; i < ARRAY_SIZE(cpu_regs->vcpu_regs.reserved_32); i++)
if (cpu_regs->vcpu_regs.reserved_32[i]) {
kfree(cpu_regs);
return -EINVAL;
}
for (i = 0; i < ARRAY_SIZE(cpu_regs->vcpu_regs.reserved_64); i++)
if (cpu_regs->vcpu_regs.reserved_64[i]) {
kfree(cpu_regs);
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]) {
kfree(cpu_regs);
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;
case ACRN_IOCTL_SET_MEMSEG:
if (copy_from_user(&memmap, (void __user *)ioctl_param,
sizeof(memmap)))
return -EFAULT;
ret = acrn_vm_memseg_map(vm, &memmap);
break;
case ACRN_IOCTL_UNSET_MEMSEG:
if (copy_from_user(&memmap, (void __user *)ioctl_param,
sizeof(memmap)))
return -EFAULT;
ret = acrn_vm_memseg_unmap(vm, &memmap);
break;
case ACRN_IOCTL_ASSIGN_MMIODEV:
mmiodev = memdup_user((void __user *)ioctl_param,
sizeof(struct acrn_mmiodev));
if (IS_ERR(mmiodev))
return PTR_ERR(mmiodev);
ret = hcall_assign_mmiodev(vm->vmid, virt_to_phys(mmiodev));
if (ret < 0)
dev_dbg(acrn_dev.this_device,
"Failed to assign MMIO device!\n");
kfree(mmiodev);
break;
case ACRN_IOCTL_DEASSIGN_MMIODEV:
mmiodev = memdup_user((void __user *)ioctl_param,
sizeof(struct acrn_mmiodev));
if (IS_ERR(mmiodev))
return PTR_ERR(mmiodev);
ret = hcall_deassign_mmiodev(vm->vmid, virt_to_phys(mmiodev));
if (ret < 0)
dev_dbg(acrn_dev.this_device,
"Failed to deassign MMIO device!\n");
kfree(mmiodev);
break;
case ACRN_IOCTL_ASSIGN_PCIDEV:
pcidev = memdup_user((void __user *)ioctl_param,
sizeof(struct acrn_pcidev));
if (IS_ERR(pcidev))
return PTR_ERR(pcidev);
ret = hcall_assign_pcidev(vm->vmid, virt_to_phys(pcidev));
if (ret < 0)
dev_dbg(acrn_dev.this_device,
"Failed to assign pci device!\n");
kfree(pcidev);
break;
case ACRN_IOCTL_DEASSIGN_PCIDEV:
pcidev = memdup_user((void __user *)ioctl_param,
sizeof(struct acrn_pcidev));
if (IS_ERR(pcidev))
return PTR_ERR(pcidev);
ret = hcall_deassign_pcidev(vm->vmid, virt_to_phys(pcidev));
if (ret < 0)
dev_dbg(acrn_dev.this_device,
"Failed to deassign pci device!\n");
kfree(pcidev);
break;
case ACRN_IOCTL_CREATE_VDEV:
vdev = memdup_user((void __user *)ioctl_param,
sizeof(struct acrn_vdev));
if (IS_ERR(vdev))
return PTR_ERR(vdev);
ret = hcall_create_vdev(vm->vmid, virt_to_phys(vdev));
if (ret < 0)
dev_dbg(acrn_dev.this_device,
"Failed to create virtual device!\n");
kfree(vdev);
break;
case ACRN_IOCTL_DESTROY_VDEV:
vdev = memdup_user((void __user *)ioctl_param,
sizeof(struct acrn_vdev));
if (IS_ERR(vdev))
return PTR_ERR(vdev);
ret = hcall_destroy_vdev(vm->vmid, virt_to_phys(vdev));
if (ret < 0)
dev_dbg(acrn_dev.this_device,
"Failed to destroy virtual device!\n");
kfree(vdev);
break;
case ACRN_IOCTL_SET_PTDEV_INTR:
irq_info = memdup_user((void __user *)ioctl_param,
sizeof(struct acrn_ptdev_irq));
if (IS_ERR(irq_info))
return PTR_ERR(irq_info);
ret = hcall_set_ptdev_intr(vm->vmid, virt_to_phys(irq_info));
if (ret < 0)
dev_dbg(acrn_dev.this_device,
"Failed to configure intr for ptdev!\n");
kfree(irq_info);
break;
case ACRN_IOCTL_RESET_PTDEV_INTR:
irq_info = memdup_user((void __user *)ioctl_param,
sizeof(struct acrn_ptdev_irq));
if (IS_ERR(irq_info))
return PTR_ERR(irq_info);
ret = hcall_reset_ptdev_intr(vm->vmid, virt_to_phys(irq_info));
if (ret < 0)
dev_dbg(acrn_dev.this_device,
"Failed to reset intr for ptdev!\n");
kfree(irq_info);
break;
case ACRN_IOCTL_SET_IRQLINE:
ret = hcall_set_irqline(vm->vmid, ioctl_param);
if (ret < 0)
dev_dbg(acrn_dev.this_device,
"Failed to set interrupt line!\n");
break;
case ACRN_IOCTL_INJECT_MSI:
msi = memdup_user((void __user *)ioctl_param,
sizeof(struct acrn_msi_entry));
if (IS_ERR(msi))
return PTR_ERR(msi);
ret = hcall_inject_msi(vm->vmid, virt_to_phys(msi));
if (ret < 0)
dev_dbg(acrn_dev.this_device,
"Failed to inject MSI!\n");
kfree(msi);
break;
case ACRN_IOCTL_VM_INTR_MONITOR:
ret = pin_user_pages_fast(ioctl_param, 1,
FOLL_WRITE | FOLL_LONGTERM, &page);
if (unlikely(ret != 1)) {
dev_dbg(acrn_dev.this_device,
"Failed to pin intr hdr buffer!\n");
return -EFAULT;
}
ret = hcall_vm_intr_monitor(vm->vmid, page_to_phys(page));
if (ret < 0) {
unpin_user_page(page);
dev_dbg(acrn_dev.this_device,
"Failed to monitor intr data!\n");
return ret;
}
if (vm->monitor_page)
unpin_user_page(vm->monitor_page);
vm->monitor_page = page;
break;
case ACRN_IOCTL_CREATE_IOREQ_CLIENT:
if (vm->default_client)
return -EEXIST;
if (!acrn_ioreq_client_create(vm, NULL, NULL, true, "acrndm"))
ret = -EINVAL;
break;
case ACRN_IOCTL_DESTROY_IOREQ_CLIENT:
if (vm->default_client)
acrn_ioreq_client_destroy(vm->default_client);
break;
case ACRN_IOCTL_ATTACH_IOREQ_CLIENT:
if (vm->default_client)
ret = acrn_ioreq_client_wait(vm->default_client);
else
ret = -ENODEV;
break;
case ACRN_IOCTL_NOTIFY_REQUEST_FINISH:
if (copy_from_user(¬ify, (void __user *)ioctl_param,
sizeof(struct acrn_ioreq_notify)))
return -EFAULT;
if (notify.reserved != 0)
return -EINVAL;
ret = acrn_ioreq_request_default_complete(vm, notify.vcpu);
break;
case ACRN_IOCTL_CLEAR_VM_IOREQ:
acrn_ioreq_request_clear(vm);
break;
case ACRN_IOCTL_PM_GET_CPU_STATE:
if (copy_from_user(&cstate_cmd, (void __user *)ioctl_param,
sizeof(cstate_cmd)))
return -EFAULT;
ret = pmcmd_ioctl(cstate_cmd, (void __user *)ioctl_param);
break;
case ACRN_IOCTL_IOEVENTFD:
if (copy_from_user(&ioeventfd, (void __user *)ioctl_param,
sizeof(ioeventfd)))
return -EFAULT;
if (ioeventfd.reserved != 0)
return -EINVAL;
ret = acrn_ioeventfd_config(vm, &ioeventfd);
break;
case ACRN_IOCTL_IRQFD:
if (copy_from_user(&irqfd, (void __user *)ioctl_param,
sizeof(irqfd)))
return -EFAULT;
ret = acrn_irqfd_config(vm, &irqfd);
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 ssize_t remove_cpu_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
u64 cpu, lapicid;
int ret;
if (kstrtoull(buf, 0, &cpu) < 0)
return -EINVAL;
if (cpu >= num_possible_cpus() || cpu == 0 || !cpu_is_hotpluggable(cpu))
return -EINVAL;
if (cpu_online(cpu))
remove_cpu(cpu);
lapicid = cpu_data(cpu).apicid;
dev_dbg(dev, "Try to remove cpu %lld with lapicid %lld\n", cpu, lapicid);
ret = hcall_sos_remove_cpu(lapicid);
if (ret < 0) {
dev_err(dev, "Failed to remove cpu %lld!\n", cpu);
goto fail_remove;
}
return count;
fail_remove:
add_cpu(cpu);
return ret;
}
static DEVICE_ATTR_WO(remove_cpu);
static umode_t acrn_attr_visible(struct kobject *kobj, struct attribute *a, int n)
{
if (a == &dev_attr_remove_cpu.attr)
return IS_ENABLED(CONFIG_HOTPLUG_CPU) ? a->mode : 0;
return a->mode;
}
static struct attribute *acrn_attrs[] = {
&dev_attr_remove_cpu.attr,
NULL
};
static struct attribute_group acrn_attr_group = {
.attrs = acrn_attrs,
.is_visible = acrn_attr_visible,
};
static const struct attribute_group *acrn_attr_groups[] = {
&acrn_attr_group,
NULL
};
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,
.groups = acrn_attr_groups,
};
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;
}
ret = acrn_ioreq_intr_setup();
if (ret) {
pr_err("Setup I/O request handler failed!\n");
misc_deregister(&acrn_dev);
return ret;
}
return 0;
}
static void __exit hsm_exit(void)
{
acrn_ioreq_intr_remove();
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)");
