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VFIO updates for v4.13-rc1

Browse source 
- Include Intel XXV710 in INTx workaround (Alex Williamson)
 
  - Make use of ERR_CAST() for error return (Dan Carpenter)
 
  - Fix vfio_group release deadlock from iommu notifier (Alex Williamson)
 
  - Unset KVM-VFIO attributes only on group match (Alex Williamson)
 
  - Fix release path group/file matching with KVM-VFIO (Alex Williamson)
 
  - Remove unnecessary lock uses triggering lockdep splat (Alex Williamson)
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Merge tag 'vfio-v4.13-rc1' of git://github.com/awilliam/linux-vfio

Pull VFIO updates from Alex Williamson:

 - Include Intel XXV710 in INTx workaround (Alex Williamson)

 - Make use of ERR_CAST() for error return (Dan Carpenter)

 - Fix vfio_group release deadlock from iommu notifier (Alex Williamson)

 - Unset KVM-VFIO attributes only on group match (Alex Williamson)

 - Fix release path group/file matching with KVM-VFIO (Alex Williamson)

 - Remove unnecessary lock uses triggering lockdep splat (Alex Williamson)

* tag 'vfio-v4.13-rc1' of git://github.com/awilliam/linux-vfio:
  vfio: Remove unnecessary uses of vfio_container.group_lock
  vfio: New external user group/file match
  kvm-vfio: Decouple only when we match a group
  vfio: Fix group release deadlock
  vfio: Use ERR_CAST() instead of open coding it
  vfio/pci: Add Intel XXV710 to hidden INTx devices
This commit is contained in:
Linus Torvalds 2017-07-13 12:23:54 -07:00
commit 8c6f5e7359
4 changed files with 75 additions and 57 deletions
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40
virt/kvm/vfio.c
View file

@ -51,6 +51,22 @@ static struct vfio_group *kvm_vfio_group_get_external_user(struct file *filep)
return vfio_group;
}
static bool kvm_vfio_external_group_match_file(struct vfio_group *group,
struct file *filep)
{
bool ret, (*fn)(struct vfio_group *, struct file *);
fn = symbol_get(vfio_external_group_match_file);
if (!fn)
return false;
ret = fn(group, filep);
symbol_put(vfio_external_group_match_file);
return ret;
}
static void kvm_vfio_group_put_external_user(struct vfio_group *vfio_group)
{
void (*fn)(struct vfio_group *);
@ -231,37 +247,31 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
if (!f.file)
return -EBADF;
vfio_group = kvm_vfio_group_get_external_user(f.file);
fdput(f);
if (IS_ERR(vfio_group))
return PTR_ERR(vfio_group);
ret = -ENOENT;
mutex_lock(&kv->lock);
list_for_each_entry(kvg, &kv->group_list, node) {
if (kvg->vfio_group != vfio_group)
if (!kvm_vfio_external_group_match_file(kvg->vfio_group,
f.file))
continue;
list_del(&kvg->node);
kvm_arch_end_assignment(dev->kvm);
#ifdef CONFIG_SPAPR_TCE_IOMMU
kvm_spapr_tce_release_vfio_group(dev->kvm,
kvg->vfio_group);
#endif
kvm_vfio_group_set_kvm(kvg->vfio_group, NULL);
kvm_vfio_group_put_external_user(kvg->vfio_group);
kfree(kvg);
ret = 0;
break;
}
kvm_arch_end_assignment(dev->kvm);
mutex_unlock(&kv->lock);
#ifdef CONFIG_SPAPR_TCE_IOMMU
kvm_spapr_tce_release_vfio_group(dev->kvm, vfio_group);
#endif
kvm_vfio_group_set_kvm(vfio_group, NULL);
kvm_vfio_group_put_external_user(vfio_group);
fdput(f);
kvm_vfio_update_coherency(dev);