Patch "vfio: New external user group/file match" has been added to the 4.9-stable tree

PATCH [email protected] 1 participant 1 message Jul 25, 2017

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Stable branch KVM VFIO driver

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2017-07-25 04:30 UTC #0 lore raw

This is a note to let you know that I've just added the patch titled

vfio: New external user group/file match

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
vfio-new-external-user-group-file-match.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

Quoted 1 line

From 5d6dee80a1e94cc284d03e06d930e60e8d3ecf7d Mon Sep 17 00:00:00 2001

From: Alex Williamson <[email protected]>
Date: Wed, 28 Jun 2017 13:50:05 -0600
Subject: vfio: New external user group/file match

From: Alex Williamson <[email protected]>

commit 5d6dee80a1e94cc284d03e06d930e60e8d3ecf7d upstream.

At the point where the kvm-vfio pseudo device wants to release its vfio group reference, we can't always acquire a new reference to make that happen. The group can be in a state where we wouldn't allow a new reference to be added. This new helper function allows a caller to match a file to a group to facilitate this. Given a file and group, report if they match. Thus the caller needs to already have a group reference to match to the file. This allows the deletion of a group without acquiring a new reference.

Signed-off-by Alex Williamson <[email protected]>

Reviewed-by Eric Auger <[email protected]>

Reviewed-by Paolo Bonzini <[email protected]>

Tested-by Eric Auger <[email protected]>

Signed-off-by Greg Kroah-Hartman <[email protected]>

---
 drivers/vfio/vfio.c  |    9 +++++++++
 include/linux/vfio.h |    2 ++
 virt/kvm/vfio.c      |   27 +++++++++++++++++++--------
 3 files changed, 30 insertions(+), 8 deletions(-)

drivers/vfio/vfio.c +9 -0

@@ -1751,6 +1751,15 @@ void vfio_group_put_external_user(struct
 }
 EXPORT_SYMBOL_GPL(vfio_group_put_external_user);
 
+bool vfio_external_group_match_file(struct vfio_group *test_group,
+				    struct file *filep)
+{
+	struct vfio_group *group = filep->private_data;
+
+	return (filep->f_op == &vfio_group_fops) && (group == test_group);
+}
+EXPORT_SYMBOL_GPL(vfio_external_group_match_file);
+
 int vfio_external_user_iommu_id(struct vfio_group *group)
 {
 	return iommu_group_id(group->iommu_group);

include/linux/vfio.h +2 -0

@@ -88,6 +88,8 @@ extern void vfio_unregister_iommu_driver
  */
 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 long vfio_external_check_extension(struct vfio_group *group,
 					  unsigned long arg);

virt/kvm/vfio.c +19 -8

@@ -47,6 +47,22 @@ static struct vfio_group *kvm_vfio_group
 	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 *);

@@ -171,18 +187,13 @@ static int kvm_vfio_set_group(struct kvm
 		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);

@@ -196,7 +207,7 @@ static int kvm_vfio_set_group(struct kvm
 
 		mutex_unlock(&kv->lock);
 
-		kvm_vfio_group_put_external_user(vfio_group);
+		fdput(f);
 
 		kvm_vfio_update_coherency(dev);

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/vfio-new-external-user-group-file-match.patch queue-4.9/vfio-fix-group-release-deadlock.patch