linux-kernel - [RFC PATCH 1/1] vfio-pci/iommu: Detach iommu group on remove path

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Date:	Tue, 21 Jul 2015 19:44:06 +0200
From:	Gerald Schaefer <gerald.schaefer@...ibm.com>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	<kvm@...r.kernel.org>, linux-kernel@...r.kernel.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	Gerald Schaefer <gerald.schaefer@...ibm.com>
Subject: [RFC PATCH 1/1] vfio-pci/iommu: Detach iommu group on remove path

When a user completes the VFIO_SET_IOMMU ioctl and the vfio-pci device is
removed thereafter (before any other ioctl like VFIO_GROUP_GET_DEVICE_FD),
then the detach_dev callback of the underlying IOMMU API is never called.

This patch adds a call to vfio_group_try_dissolve_container() to the remove
path, which will trigger the missing detach_dev callback in this scenario.

Signed-off-by: Gerald Schaefer <gerald.schaefer@...ibm.com>
---
 drivers/vfio/vfio.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 2fb29df..9c5c784 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -711,6 +711,8 @@ static bool vfio_dev_present(struct vfio_group *group, struct device *dev)
 	return true;
 }
 
+static void vfio_group_try_dissolve_container(struct vfio_group *group);
+
 /*
  * Decrement the device reference count and wait for the device to be
  * removed.  Open file descriptors for the device... */
@@ -785,6 +787,7 @@ void *vfio_del_group_dev(struct device *dev)
 		}
 	} while (ret <= 0);
 
+	vfio_group_try_dissolve_container(group);
 	vfio_group_put(group);
 
 	return device_data;
-- 
2.3.8

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