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authorJason Gunthorpe <jgg@nvidia.com>2022-05-04 16:14:41 -0300
committerAlex Williamson <alex.williamson@redhat.com>2022-05-13 10:14:19 -0600
commit50d63b5bbfd12262069ad062611cd5e69c5e9e05 (patch)
tree1642d1f0eb0fdbb2d974138b2b911905bfbe257c
parentd55d9e7a4572182701ed0b62313b4f22e544e226 (diff)
vfio: Change vfio_external_user_iommu_id() to vfio_file_iommu_group()
The only caller wants to get a pointer to the struct iommu_group associated with the VFIO group file. Instead of returning the group ID then searching sysfs for that string to get the struct iommu_group just directly return the iommu_group pointer already held by the vfio_group struct. It already has a safe lifetime due to the struct file kref, the vfio_group and thus the iommu_group cannot be destroyed while the group file is open. Reviewed-by: Kevin Tian <kevin.tian@intel.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Yi Liu <yi.l.liu@intel.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/3-v3-f7729924a7ea+25e33-vfio_kvm_no_group_jgg@nvidia.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
-rw-r--r--drivers/vfio/vfio.c21
-rw-r--r--include/linux/vfio.h2
-rw-r--r--virt/kvm/vfio.c37
3 files changed, 27 insertions, 33 deletions
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 8cb7ba03aa16..25f90f3773de 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -1653,10 +1653,7 @@ static const struct file_operations vfio_device_fops = {
* increments the container user counter to prevent
* the VFIO group from disposal before KVM exits.
*
- * 3. The external user calls vfio_external_user_iommu_id()
- * to know an IOMMU ID.
- *
- * 4. When the external KVM finishes, it calls
+ * 3. When the external KVM finishes, it calls
* vfio_group_put_external_user() to release the VFIO group.
* This call decrements the container user counter.
*/
@@ -1697,11 +1694,21 @@ bool vfio_external_group_match_file(struct vfio_group *test_group,
}
EXPORT_SYMBOL_GPL(vfio_external_group_match_file);
-int vfio_external_user_iommu_id(struct vfio_group *group)
+/**
+ * vfio_file_iommu_group - Return the struct iommu_group for the vfio group file
+ * @file: VFIO group file
+ *
+ * The returned iommu_group is valid as long as a ref is held on the file.
+ */
+struct iommu_group *vfio_file_iommu_group(struct file *file)
{
- return iommu_group_id(group->iommu_group);
+ struct vfio_group *group = file->private_data;
+
+ if (file->f_op != &vfio_group_fops)
+ return NULL;
+ return group->iommu_group;
}
-EXPORT_SYMBOL_GPL(vfio_external_user_iommu_id);
+EXPORT_SYMBOL_GPL(vfio_file_iommu_group);
long vfio_external_check_extension(struct vfio_group *group, unsigned long arg)
{
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index be1e7db4a314..d8c34c8490cb 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -140,7 +140,7 @@ extern struct vfio_group *vfio_group_get_external_user(struct file *filep);
extern void vfio_group_put_external_user(struct vfio_group *group);
extern bool vfio_external_group_match_file(struct vfio_group *group,
struct file *filep);
-extern int vfio_external_user_iommu_id(struct vfio_group *group);
+extern struct iommu_group *vfio_file_iommu_group(struct file *file);
extern long vfio_external_check_extension(struct vfio_group *group,
unsigned long arg);
diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
index 3bd2615154d0..9b7384dde158 100644
--- a/virt/kvm/vfio.c
+++ b/virt/kvm/vfio.c
@@ -108,43 +108,31 @@ static bool kvm_vfio_group_is_coherent(struct vfio_group *vfio_group)
}
#ifdef CONFIG_SPAPR_TCE_IOMMU
-static int kvm_vfio_external_user_iommu_id(struct vfio_group *vfio_group)
+static struct iommu_group *kvm_vfio_file_iommu_group(struct file *file)
{
- int (*fn)(struct vfio_group *);
- int ret = -EINVAL;
+ struct iommu_group *(*fn)(struct file *file);
+ struct iommu_group *ret;
- fn = symbol_get(vfio_external_user_iommu_id);
+ fn = symbol_get(vfio_file_iommu_group);
if (!fn)
- return ret;
+ return NULL;
- ret = fn(vfio_group);
+ ret = fn(file);
- symbol_put(vfio_external_user_iommu_id);
+ symbol_put(vfio_file_iommu_group);
return ret;
}
-static struct iommu_group *kvm_vfio_group_get_iommu_group(
- struct vfio_group *group)
-{
- int group_id = kvm_vfio_external_user_iommu_id(group);
-
- if (group_id < 0)
- return NULL;
-
- return iommu_group_get_by_id(group_id);
-}
-
static void kvm_spapr_tce_release_vfio_group(struct kvm *kvm,
- struct vfio_group *vfio_group)
+ struct kvm_vfio_group *kvg)
{
- struct iommu_group *grp = kvm_vfio_group_get_iommu_group(vfio_group);
+ struct iommu_group *grp = kvm_vfio_file_iommu_group(kvg->file);
if (WARN_ON_ONCE(!grp))
return;
kvm_spapr_tce_release_iommu_group(kvm, grp);
- iommu_group_put(grp);
}
#endif
@@ -258,7 +246,7 @@ static int kvm_vfio_group_del(struct kvm_device *dev, unsigned int fd)
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);
+ kvm_spapr_tce_release_vfio_group(dev->kvm, kvg);
#endif
kvm_vfio_group_set_kvm(kvg->vfio_group, NULL);
kvm_vfio_group_put_external_user(kvg->vfio_group);
@@ -304,7 +292,7 @@ static int kvm_vfio_group_set_spapr_tce(struct kvm_device *dev,
if (kvg->file != f.file)
continue;
- grp = kvm_vfio_group_get_iommu_group(kvg->vfio_group);
+ grp = kvm_vfio_file_iommu_group(kvg->file);
if (WARN_ON_ONCE(!grp)) {
ret = -EIO;
goto err_fdput;
@@ -312,7 +300,6 @@ static int kvm_vfio_group_set_spapr_tce(struct kvm_device *dev,
ret = kvm_spapr_tce_attach_iommu_group(dev->kvm, param.tablefd,
grp);
- iommu_group_put(grp);
break;
}
@@ -388,7 +375,7 @@ static void kvm_vfio_destroy(struct kvm_device *dev)
list_for_each_entry_safe(kvg, tmp, &kv->group_list, node) {
#ifdef CONFIG_SPAPR_TCE_IOMMU
- kvm_spapr_tce_release_vfio_group(dev->kvm, kvg->vfio_group);
+ kvm_spapr_tce_release_vfio_group(dev->kvm, kvg);
#endif
kvm_vfio_group_set_kvm(kvg->vfio_group, NULL);
kvm_vfio_group_put_external_user(kvg->vfio_group);