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linux/drivers/virt/acrn/hsm.c
Thomas Gleixner b9655e702d x86/cpu: Encapsulate topology information in cpuinfo_x86 
The topology related information is randomly scattered across cpuinfo_x86.

Create a new structure cpuinfo_topo and move in a first step initial_apicid
and apicid into it.

Aside of being better readable this is in preparation for replacing the
horribly fragile CPU topology evaluation code further down the road.

Consolidate APIC ID fields to u32 as that represents the hardware type.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juergen Gross <jgross@suse.com>
Tested-by: Sohil Mehta <sohil.mehta@intel.com>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230814085112.269787744@linutronix.de
2023-10-10 14:38:17 +02:00

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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/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(&notify, (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).topo.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)");
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