From: Yi Liu <yi.l.liu@intel.com>
Date: Tue, 18 Jul 2023 06:55:41 -0700
Subject: vfio: Move vfio_device_group_unregister() to be the first operation
in unregister
Git-commit: 291872a533a2cdea8df1ae157987cd7ab3939421
Patch-mainline: v6.6-rc1
References: jsc#PED-7779 jsc#PED-7780
This avoids endless vfio_device refcount increment by userspace, which
would keep blocking the vfio_unregister_group_dev().
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Tested-by: Yanting Jiang <yanting.jiang@intel.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Tested-by: Terrence Xu <terrence.xu@intel.com>
Tested-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Link: https://lore.kernel.org/r/20230718135551.6592-17-yi.l.liu@intel.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Joerg Roedel <jroedel@suse.de>
---
drivers/vfio/vfio_main.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
index c71c0d1a079f..6d45caa1f9a0 100644
--- a/drivers/vfio/vfio_main.c
+++ b/drivers/vfio/vfio_main.c
@@ -332,6 +332,12 @@ void vfio_unregister_group_dev(struct vfio_device *device)
bool interrupted = false;
long rc;
+ /*
+ * Prevent new device opened by userspace via the
+ * VFIO_GROUP_GET_DEVICE_FD in the group path.
+ */
+ vfio_device_group_unregister(device);
+
vfio_device_put_registration(device);
rc = try_wait_for_completion(&device->comp);
while (rc <= 0) {
@@ -355,8 +361,6 @@ void vfio_unregister_group_dev(struct vfio_device *device)
}
}
- vfio_device_group_unregister(device);
-
/* Balances device_add in register path */
device_del(&device->device);