- 根目录:
- arch
- x86
- kvm
- assigned-dev.c
/*
* Kernel-based Virtual Machine - device assignment support
*
* Copyright (C) 2010 Red Hat, Inc. and/or its affiliates.
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#include <linux/kvm_host.h>
#include <linux/kvm.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/errno.h>
#include <linux/spinlock.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/namei.h>
#include <linux/fs.h>
#include "irq.h"
#include "assigned-dev.h"
struct kvm_assigned_dev_kernel {
struct kvm_irq_ack_notifier ack_notifier;
struct list_head list;
int assigned_dev_id;
int host_segnr;
int host_busnr;
int host_devfn;
unsigned int entries_nr;
int host_irq;
bool host_irq_disabled;
bool pci_2_3;
struct msix_entry *host_msix_entries;
int guest_irq;
struct msix_entry *guest_msix_entries;
unsigned long irq_requested_type;
int irq_source_id;
int flags;
struct pci_dev *dev;
struct kvm *kvm;
spinlock_t intx_lock;
spinlock_t intx_mask_lock;
char irq_name[32];
struct pci_saved_state *pci_saved_state;
};
static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head,
int assigned_dev_id)
{
struct list_head *ptr;
struct kvm_assigned_dev_kernel *match;
list_for_each(ptr, head) {
match = list_entry(ptr, struct kvm_assigned_dev_kernel, list);
if (match->assigned_dev_id == assigned_dev_id)
return match;
}
return NULL;
}
static int find_index_from_host_irq(struct kvm_assigned_dev_kernel
*assigned_dev, int irq)
{
int i, index;
struct msix_entry *host_msix_entries;
host_msix_entries = assigned_dev->host_msix_entries;
index = -1;
for (i = 0; i < assigned_dev->entries_nr; i++)
if (irq == host_msix_entries[i].vector) {
index = i;
break;
}
if (index < 0)
printk(KERN_WARNING "Fail to find correlated MSI-X entry!\n");
return index;
}
static irqreturn_t kvm_assigned_dev_intx(int irq, void *dev_id)
{
struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
int ret;
spin_lock(&assigned_dev->intx_lock);
if (pci_check_and_mask_intx(assigned_dev->dev)) {
assigned_dev->host_irq_disabled = true;
ret = IRQ_WAKE_THREAD;
} else
ret = IRQ_NONE;
spin_unlock(&assigned_dev->intx_lock);
return ret;
}
static void
kvm_assigned_dev_raise_guest_irq(struct kvm_assigned_dev_kernel *assigned_dev,
int vector)
{
if (unlikely(assigned_dev->irq_requested_type &
KVM_DEV_IRQ_GUEST_INTX)) {
spin_lock(&assigned_dev->intx_mask_lock);
if (!(assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX))
kvm_set_irq(assigned_dev->kvm,
assigned_dev->irq_source_id, vector, 1,
false);
spin_unlock(&assigned_dev->intx_mask_lock);
} else
kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
vector, 1, false);
}
static irqreturn_t kvm_assigned_dev_thread_intx(int irq, void *dev_id)
{
struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
if (!(assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
spin_lock_irq(&assigned_dev->intx_lock);
disable_irq_nosync(irq);
assigned_dev->host_irq_disabled = true;
spin_unlock_irq(&assigned_dev->intx_lock);
}
kvm_assigned_dev_raise_guest_irq(assigned_dev,
assigned_dev->guest_irq);
return IRQ_HANDLED;
}
#ifdef __KVM_HAVE_MSI
static irqreturn_t kvm_assigned_dev_msi(int irq, void *dev_id)
{
struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
int ret = kvm_set_irq_inatomic(assigned_dev->kvm,
assigned_dev->irq_source_id,
assigned_dev->guest_irq, 1);
return unlikely(ret == -EWOULDBLOCK) ? IRQ_WAKE_THREAD : IRQ_HANDLED;
}
static irqreturn_t kvm_assigned_dev_thread_msi(int irq, void *dev_id)
{
struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
kvm_assigned_dev_raise_guest_irq(assigned_dev,
assigned_dev->guest_irq);
return IRQ_HANDLED;
}
#endif
#ifdef __KVM_HAVE_MSIX
static irqreturn_t kvm_assigned_dev_msix(int irq, void *dev_id)
{
struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
int index = find_index_from_host_irq(assigned_dev, irq);
u32 vector;
int ret = 0;
if (index >= 0) {
vector = assigned_dev->guest_msix_entries[index].vector;
ret = kvm_set_irq_inatomic(assigned_dev->kvm,
assigned_dev->irq_source_id,
vector, 1);
}
return unlikely(ret == -EWOULDBLOCK) ? IRQ_WAKE_THREAD : IRQ_HANDLED;
}
static irqreturn_t kvm_assigned_dev_thread_msix(int irq, void *dev_id)
{
struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
int index = find_index_from_host_irq(assigned_dev, irq);
u32 vector;
if (index >= 0) {
vector = assigned_dev->guest_msix_entries[index].vector;
kvm_assigned_dev_raise_guest_irq(assigned_dev, vector);
}
return IRQ_HANDLED;
}
#endif
/* Ack the irq line for an assigned device */
static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
{
struct kvm_assigned_dev_kernel *dev =
container_of(kian, struct kvm_assigned_dev_kernel,
ack_notifier);
kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0, false);
spin_lock(&dev->intx_mask_lock);
if (!(dev->flags & KVM_DEV_ASSIGN_MASK_INTX)) {
bool reassert = false;
spin_lock_irq(&dev->intx_lock);
/*
* The guest IRQ may be shared so this ack can come from an
* IRQ for another guest device.
*/
if (dev->host_irq_disabled) {
if (!(dev->flags & KVM_DEV_ASSIGN_PCI_2_3))
enable_irq(dev->host_irq);
else if (!pci_check_and_unmask_intx(dev->dev))
reassert = true;
dev->host_irq_disabled = reassert;
}
spin_unlock_irq(&dev->intx_lock);
if (reassert)
kvm_set_irq(dev->kvm, dev->irq_source_id,
dev->guest_irq, 1, false);
}
spin_unlock(&dev->intx_mask_lock);
}
static void deassign_guest_irq(struct kvm *kvm,
struct kvm_assigned_dev_kernel *assigned_dev)
{
if (assigned_dev->ack_notifier.gsi != -1)
kvm_unregister_irq_ack_notifier(kvm,
&assigned_dev->ack_notifier);
kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
assigned_dev->guest_irq, 0, false);
if (assigned_dev->irq_source_id != -1)
kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
assigned_dev->irq_source_id = -1;
assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_GUEST_MASK);
}
/* The function implicit hold kvm->lock mutex due to cancel_work_sync() */
static void deassign_host_irq(struct kvm *kvm,
struct kvm_assigned_dev_kernel *assigned_dev)
{
/*
* We disable irq here to prevent further events.
*
* Notice this maybe result in nested disable if the interrupt type is
* INTx, but it's OK for we are going to free it.
*
* If this function is a part of VM destroy, please ensure that till
* now, the kvm state is still legal for probably we also have to wait
* on a currently running IRQ handler.
*/
if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
int i;
for (i = 0; i < assigned_dev->entries_nr; i++)
disable_irq(assigned_dev->host_msix_entries[i].vector);
for (i = 0; i < assigned_dev->entries_nr; i++)
free_irq(assigned_dev->host_msix_entries[i].vector,
assigned_dev);
assigned_dev->entries_nr = 0;
kfree(assigned_dev->host_msix_entries);
kfree(assigned_dev->guest_msix_entries);
pci_disable_msix(assigned_dev->dev);
} else {
/* Deal with MSI and INTx */
if ((assigned_dev->irq_requested_type &
KVM_DEV_IRQ_HOST_INTX) &&
(assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
spin_lock_irq(&assigned_dev->intx_lock);
pci_intx(assigned_dev->dev, false);
spin_unlock_irq(&assigned_dev->intx_lock);
synchronize_irq(assigned_dev->host_irq);
} else
disable_irq(assigned_dev->host_irq);
free_irq(assigned_dev->host_irq, assigned_dev);
if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSI)
pci_disable_msi(assigned_dev->dev);
}
assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_HOST_MASK);
}
static int kvm_deassign_irq(struct kvm *kvm,
struct kvm_assigned_dev_kernel *assigned_dev,
unsigned long irq_requested_type)
{
unsigned long guest_irq_type, host_irq_type;
if (!irqchip_in_kernel(kvm))
return -EINVAL;
/* no irq assignment to deassign */
if (!assigned_dev->irq_requested_type)
return -ENXIO;
host_irq_type = irq_requested_type & KVM_DEV_IRQ_HOST_MASK;
guest_irq_type = irq_requested_type & KVM_DEV_IRQ_GUEST_MASK;
if (host_irq_type)
deassign_host_irq(kvm, assigned_dev);
if (guest_irq_type)
deassign_guest_irq(kvm, assigned_dev);
return 0;
}
static void kvm_free_assigned_irq(struct kvm *kvm,
struct kvm_assigned_dev_kernel *assigned_dev)
{
kvm_deassign_irq(kvm, assigned_dev, assigned_dev->irq_requested_type);
}
static void kvm_free_assigned_device(struct kvm *kvm,
struct kvm_assigned_dev_kernel
*assigned_dev)
{
kvm_free_assigned_irq(kvm, assigned_dev);
pci_reset_function(assigned_dev->dev);
if (pci_load_and_free_saved_state(assigned_dev->dev,
&assigned_dev->pci_saved_state))
printk(KERN_INFO "%s: Couldn't reload %s saved state\n",
__func__, dev_name(&assigned_dev->dev->dev));
else
pci_restore_state(assigned_dev->dev);
pci_clear_dev_assigned(assigned_dev->dev);
pci_release_regions(assigned_dev->dev);
pci_disable_device(assigned_dev->dev);
pci_dev_put(assigned_dev->dev);
list_del(&assigned_dev->list);
kfree(assigned_dev);
}
void kvm_free_all_assigned_devices(struct kvm *kvm)
{
struct list_head *ptr, *ptr2;
struct kvm_assigned_dev_kernel *assigned_dev;
list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
assigned_dev = list_entry(ptr,
struct kvm_assigned_dev_kernel,
list);
kvm_free_assigned_device(kvm, assigned_dev);
}
}
static int assigned_device_enable_host_intx(struct kvm *kvm,
struct kvm_assigned_dev_kernel *dev)
{
irq_handler_t irq_handler;
unsigned long flags;
dev->host_irq = dev->dev->irq;
/*
* We can only share the IRQ line with other host devices if we are
* able to disable the IRQ source at device-level - independently of
* the guest driver. Otherwise host devices may suffer from unbounded
* IRQ latencies when the guest keeps the line asserted.
*/
if (dev->flags & KVM_DEV_ASSIGN_PCI_2_3) {
irq_handler = kvm_assigned_dev_intx;
flags = IRQF_SHARED;
} else {
irq_handler = NULL;
flags = IRQF_ONESHOT;
}
if (request_threaded_irq(dev->host_irq, irq_handler,
kvm_assigned_dev_thread_intx, flags,
dev->irq_name, dev))
return -EIO;
if (dev->flags & KVM_DEV_ASSIGN_PCI_2_3) {
spin_lock_irq(&dev->intx_lock);
pci_intx(dev->dev, true);
spin_unlock_irq(&dev->intx_lock);
}
return 0;
}
#ifdef __KVM_HAVE_MSI
static int assigned_device_enable_host_msi(struct kvm *kvm,
struct kvm_assigned_dev_kernel *dev)
{
int r;
if (!dev->dev->msi_enabled) {
r = pci_enable_msi(dev->dev);
if (r)
return r;
}
dev->host_irq = dev->dev->irq;
if (request_threaded_irq(dev->host_irq, kvm_assigned_dev_msi,
kvm_assigned_dev_thread_msi, 0,
dev->irq_name, dev)) {
pci_disable_msi(dev->dev);
return -EIO;
}
return 0;
}
#endif
#ifdef __KVM_HAVE_MSIX
static int assigned_device_enable_host_msix(struct kvm *kvm,
struct kvm_assigned_dev_kernel *dev)
{
int i, r = -EINVAL;
/* host_msix_entries and guest_msix_entries should have been
* initialized */
if (dev->entries_nr == 0)
return r;
r = pci_enable_msix_exact(dev->dev,
dev->host_msix_entries, dev->entries_nr);
if (r)
return r;
for (i = 0; i < dev->entries_nr; i++) {
r = request_threaded_irq(dev->host_msix_entries[i].vector,
kvm_assigned_dev_msix,
kvm_assigned_dev_thread_msix,
0, dev->irq_name, dev);
if (r)
goto err;
}
return 0;
err:
for (i -= 1; i >= 0; i--)
free_irq(dev->host_msix_entries[i].vector, dev);
pci_disable_msix(dev->dev);
return r;
}
#endif
static int assigned_device_enable_guest_intx(struct kvm *kvm,
struct kvm_assigned_dev_kernel *dev,
struct kvm_assigned_irq *irq)
{
dev->guest_irq = irq->guest_irq;
dev->ack_notifier.gsi = irq->guest_irq;
return 0;
}
#ifdef __KVM_HAVE_MSI
static int assigned_device_enable_guest_msi(struct kvm *kvm,
struct kvm_assigned_dev_kernel *dev,
struct kvm_assigned_irq *irq)
{
dev->guest_irq = irq->guest_irq;
dev->ack_notifier.gsi = -1;
return 0;
}
#endif
#ifdef __KVM_HAVE_MSIX
static int assigned_device_enable_guest_msix(struct kvm *kvm,
struct kvm_assigned_dev_kernel *dev,
struct kvm_assigned_irq *irq)
{
dev->guest_irq = irq->guest_irq;
dev->ack_notifier.gsi = -1;
return 0;
}
#endif
static int assign_host_irq(struct kvm *kvm,
struct kvm_assigned_dev_kernel *dev,
__u32 host_irq_type)
{
int r = -EEXIST;
if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK)
return r;
snprintf(dev->irq_name, sizeof(dev->irq_name), "kvm:%s",
pci_name(dev->dev));
switch (host_irq_type) {
case KVM_DEV_IRQ_HOST_INTX:
r = assigned_device_enable_host_intx(kvm, dev);
break;
#ifdef __KVM_HAVE_MSI
case KVM_DEV_IRQ_HOST_MSI:
r = assigned_device_enable_host_msi(kvm, dev);
break;
#endif
#ifdef __KVM_HAVE_MSIX
case KVM_DEV_IRQ_HOST_MSIX:
r = assigned_device_enable_host_msix(kvm, dev);
break;
#endif
default:
r = -EINVAL;
}
dev->host_irq_disabled = false;
if (!r)
dev->irq_requested_type |= host_irq_type;
return r;
}
static int assign_guest_irq(struct kvm *kvm,
struct kvm_assigned_dev_kernel *dev,
struct kvm_assigned_irq *irq,
unsigned long guest_irq_type)
{
int id;
int r = -EEXIST;
if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK)
return r;
id = kvm_request_irq_source_id(kvm);
if (id < 0)
return id;
dev->irq_source_id = id;
switch (guest_irq_type) {
case KVM_DEV_IRQ_GUEST_INTX:
r = assigned_device_enable_guest_intx(kvm, dev, irq);
break;
#ifdef __KVM_HAVE_MSI
case KVM_DEV_IRQ_GUEST_MSI:
r = assigned_device_enable_guest_msi(kvm, dev, irq);
break;
#endif
#ifdef __KVM_HAVE_MSIX
case KVM_DEV_IRQ_GUEST_MSIX:
r = assigned_device_enable_guest_msix(kvm, dev, irq);
break;
#endif
default:
r = -EINVAL;
}
if (!r) {
dev->irq_requested_type |= guest_irq_type;
if (dev->ack_notifier.gsi != -1)
kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
} else {
kvm_free_irq_source_id(kvm, dev->irq_source_id);
dev->irq_source_id = -1;
}
return r;
}
/* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
struct kvm_assigned_irq *assigned_irq)
{
int r = -EINVAL;
struct kvm_assigned_dev_kernel *match;
unsigned long host_irq_type, guest_irq_type;
if (!irqchip_in_kernel(kvm))
return r;
mutex_lock(&kvm->lock);
r = -ENODEV;
match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
assigned_irq->assigned_dev_id);
if (!match)
goto out;
host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
r = -EINVAL;
/* can only assign one type at a time */
if (hweight_long(host_irq_type) > 1)
goto out;
if (hweight_long(guest_irq_type) > 1)
goto out;
if (host_irq_type == 0 && guest_irq_type == 0)
goto out;
r = 0;
if (host_irq_type)
r = assign_host_irq(kvm, match, host_irq_type);
if (r)
goto out;
if (guest_irq_type)
r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
out:
mutex_unlock(&kvm->lock);
return r;
}
static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
struct kvm_assigned_irq
*assigned_irq)
{
int r = -ENODEV;
struct kvm_assigned_dev_kernel *match;
unsigned long irq_type;
mutex_lock(&kvm->lock);
match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
assigned_irq->assigned_dev_id);
if (!match)
goto out;
irq_type = assigned_irq->flags & (KVM_DEV_IRQ_HOST_MASK |
KVM_DEV_IRQ_GUEST_MASK);
r = kvm_deassign_irq(kvm, match, irq_type);
out:
mutex_unlock(&kvm->lock);
return r;
}
/*
* We want to test whether the caller has been granted permissions to
* use this device. To be able to configure and control the device,
* the user needs access to PCI configuration space and BAR resources.
* These are accessed through PCI sysfs. PCI config space is often
* passed to the process calling this ioctl via file descriptor, so we
* can't rely on access to that file. We can check for permissions
* on each of the BAR resource files, which is a pretty clear
* indicator that the user has been granted access to the device.
*/
static int probe_sysfs_permissions(struct pci_dev *dev)
{
#ifdef CONFIG_SYSFS
int i;
bool bar_found = false;
for (i = PCI_STD_RESOURCES; i <= PCI_STD_RESOURCE_END; i++) {
char *kpath, *syspath;
struct path path;
struct inode *inode;
int r;
if (!pci_resource_len(dev, i))
continue;
kpath = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
if (!kpath)
return -ENOMEM;
/* Per sysfs-rules, sysfs is always at /sys */
syspath = kasprintf(GFP_KERNEL, "/sys%s/resource%d", kpath, i);
kfree(kpath);
if (!syspath)
return -ENOMEM;
r = kern_path(syspath, LOOKUP_FOLLOW, &path);
kfree(syspath);
if (r)
return r;
inode = d_backing_inode(path.dentry);
r = inode_permission(inode, MAY_READ | MAY_WRITE | MAY_ACCESS);
path_put(&path);
if (r)
return r;
bar_found = true;
}
/* If no resources, probably something special */
if (!bar_found)
return -EPERM;
return 0;
#else
return -EINVAL; /* No way to control the device without sysfs */
#endif
}
static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
struct kvm_assigned_pci_dev *assigned_dev)
{
int r = 0, idx;
struct kvm_assigned_dev_kernel *match;
struct pci_dev *dev;
if (!(assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU))
return -EINVAL;
mutex_lock(&kvm->lock);
idx = srcu_read_lock(&kvm->srcu);
match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
assigned_dev->assigned_dev_id);
if (match) {
/* device already assigned */
r = -EEXIST;
goto out;
}
match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
if (match == NULL) {
printk(KERN_INFO "%s: Couldn't allocate memory\n",
__func__);
r = -ENOMEM;
goto out;
}
dev = pci_get_domain_bus_and_slot(assigned_dev->segnr,
assigned_dev->busnr,
assigned_dev->devfn);
if (!dev) {
printk(KERN_INFO "%s: host device not found\n", __func__);
r = -EINVAL;
goto out_free;
}
/* Don't allow bridges to be assigned */
if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL) {
r = -EPERM;
goto out_put;
}
r = probe_sysfs_permissions(dev);
if (r)
goto out_put;
if (pci_enable_device(dev)) {
printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
r = -EBUSY;
goto out_put;
}
r = pci_request_regions(dev, "kvm_assigned_device");
if (r) {
printk(KERN_INFO "%s: Could not get access to device regions\n",
__func__);
goto out_disable;
}
pci_reset_function(dev);
pci_save_state(dev);
match->pci_saved_state = pci_store_saved_state(dev);
if (!match->pci_saved_state)
printk(KERN_DEBUG "%s: Couldn't store %s saved state\n",
__func__, dev_name(&dev->dev));
if (!pci_intx_mask_supported(dev))
assigned_dev->flags &= ~KVM_DEV_ASSIGN_PCI_2_3;
match->assigned_dev_id = assigned_dev->assigned_dev_id;
match->host_segnr = assigned_dev->segnr;
match->host_busnr = assigned_dev->busnr;
match->host_devfn = assigned_dev->devfn;
match->flags = assigned_dev->flags;
match->dev = dev;
spin_lock_init(&match->intx_lock);
spin_lock_init(&match->intx_mask_lock);
match->irq_source_id = -1;
match->kvm = kvm;
match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
list_add(&match->list, &kvm->arch.assigned_dev_head);
if (!kvm->arch.iommu_domain) {
r = kvm_iommu_map_guest(kvm);
if (r)
goto out_list_del;
}
r = kvm_assign_device(kvm, match->dev);
if (r)
goto out_list_del;
out:
srcu_read_unlock(&kvm->srcu, idx);
mutex_unlock(&kvm->lock);
return r;
out_list_del:
if (pci_load_and_free_saved_state(dev, &match->pci_saved_state))
printk(KERN_INFO "%s: Couldn't reload %s saved state\n",
__func__, dev_name(&dev->dev));
list_del(&match->list);
pci_release_regions(dev);
out_disable:
pci_disable_device(dev);
out_put:
pci_dev_put(dev);
out_free:
kfree(match);
srcu_read_unlock(&kvm->srcu, idx);
mutex_unlock(&kvm->lock);
return r;
}
static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
struct kvm_assigned_pci_dev *assigned_dev)
{
int r = 0;
struct kvm_assigned_dev_kernel *match;
mutex_lock(&kvm->lock);
match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
assigned_dev->assigned_dev_id);
if (!match) {
printk(KERN_INFO "%s: device hasn't been assigned before, "
"so cannot be deassigned\n", __func__);
r = -EINVAL;
goto out;
}
kvm_deassign_device(kvm, match->dev);
kvm_free_assigned_device(kvm, match);
out:
mutex_unlock(&kvm->lock);
return r;
}
#ifdef __KVM_HAVE_MSIX
static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
struct kvm_assigned_msix_nr *entry_nr)
{
int r = 0;
struct kvm_assigned_dev_kernel *adev;
mutex_lock(&kvm->lock);
adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
entry_nr->assigned_dev_id);
if (!adev) {
r = -EINVAL;
goto msix_nr_out;
}
if (adev->entries_nr == 0) {
adev->entries_nr = entry_nr->entry_nr;
if (adev->entries_nr == 0 ||
adev->entries_nr > KVM_MAX_MSIX_PER_DEV) {
r = -EINVAL;
goto msix_nr_out;
}
adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
entry_nr->entry_nr,
GFP_KERNEL);
if (!adev->host_msix_entries) {
r = -ENOMEM;
goto msix_nr_out;
}
adev->guest_msix_entries =
kzalloc(sizeof(struct msix_entry) * entry_nr->entry_nr,
GFP_KERNEL);
if (!adev->guest_msix_entries) {
kfree(adev->host_msix_entries);
r = -ENOMEM;
goto msix_nr_out;
}
} else /* Not allowed set MSI-X number twice */
r = -EINVAL;
msix_nr_out:
mutex_unlock(&kvm->lock);
return r;
}
static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
struct kvm_assigned_msix_entry *entry)
{
int r = 0, i;
struct kvm_assigned_dev_kernel *adev;
mutex_lock(&kvm->lock);
adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
entry->assigned_dev_id);
if (!adev) {
r = -EINVAL;
goto msix_entry_out;
}
for (i = 0; i < adev->entries_nr; i++)
if (adev->guest_msix_entries[i].vector == 0 ||
adev->guest_msix_entries[i].entry == entry->entry) {
adev->guest_msix_entries[i].entry = entry->entry;
adev->guest_msix_entries[i].vector = entry->gsi;
adev->host_msix_entries[i].entry = entry->entry;
break;
}
if (i == adev->entries_nr) {
r = -ENOSPC;
goto msix_entry_out;
}
msix_entry_out:
mutex_unlock(&kvm->lock);
return r;
}
#endif
static int kvm_vm_ioctl_set_pci_irq_mask(struct kvm *kvm,
struct kvm_assigned_pci_dev *assigned_dev)
{
int r = 0;
struct kvm_assigned_dev_kernel *match;
mutex_lock(&kvm->lock);
match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
assigned_dev->assigned_dev_id);
if (!match) {
r = -ENODEV;
goto out;
}
spin_lock(&match->intx_mask_lock);
match->flags &= ~KVM_DEV_ASSIGN_MASK_INTX;
match->flags |= assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX;
if (match->irq_requested_type & KVM_DEV_IRQ_GUEST_INTX) {
if (assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX) {
kvm_set_irq(match->kvm, match->irq_source_id,
match->guest_irq, 0, false);
/*
* Masking at hardware-level is performed on demand,
* i.e. when an IRQ actually arrives at the host.
*/
} else if (!(assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
/*
* Unmask the IRQ line if required. Unmasking at
* device level will be performed by user space.
*/
spin_lock_irq(&match->intx_lock);
if (match->host_irq_disabled) {
enable_irq(match->host_irq);
match->host_irq_disabled = false;
}
spin_unlock_irq(&match->intx_lock);
}
}
spin_unlock(&match->intx_mask_lock);
out:
mutex_unlock(&kvm->lock);
return r;
}
long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
int r;
switch (ioctl) {
case KVM_ASSIGN_PCI_DEVICE: {
struct kvm_assigned_pci_dev assigned_dev;
r = -EFAULT;
if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
goto out;
r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
if (r)
goto out;
break;
}
case KVM_ASSIGN_IRQ: {
r = -EOPNOTSUPP;
break;
}
case KVM_ASSIGN_DEV_IRQ: {
struct kvm_assigned_irq assigned_irq;
r = -EFAULT;
if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
goto out;
r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
if (r)
goto out;
break;
}
case KVM_DEASSIGN_DEV_IRQ: {
struct kvm_assigned_irq assigned_irq;
r = -EFAULT;
if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
goto out;
r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq);
if (r)
goto out;
break;
}
case KVM_DEASSIGN_PCI_DEVICE: {
struct kvm_assigned_pci_dev assigned_dev;
r = -EFAULT;
if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
goto out;
r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
if (r)
goto out;
break;
}
#ifdef __KVM_HAVE_MSIX
case KVM_ASSIGN_SET_MSIX_NR: {
struct kvm_assigned_msix_nr entry_nr;
r = -EFAULT;
if (copy_from_user(&entry_nr, argp, sizeof entry_nr))
goto out;
r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr);
if (r)
goto out;
break;
}
case KVM_ASSIGN_SET_MSIX_ENTRY: {
struct kvm_assigned_msix_entry entry;
r = -EFAULT;
if (copy_from_user(&entry, argp, sizeof entry))
goto out;
r = kvm_vm_ioctl_set_msix_entry(kvm, &entry);
if (r)
goto out;
break;
}
#endif
case KVM_ASSIGN_SET_INTX_MASK: {
struct kvm_assigned_pci_dev assigned_dev;
r = -EFAULT;
if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
goto out;
r = kvm_vm_ioctl_set_pci_irq_mask(kvm, &assigned_dev);
break;
}
default:
r = -ENOTTY;
break;
}
out:
return r;
}