lkml.org 
[lkml]   [2020]   [Mar]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v4 4/7] drm/i915/gvt: hold reference of VFIO group during opening of vgpu
Date
hold reference count of the VFIO group for each vgpu at vgpu opening and
release the reference at vgpu releasing.

Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
---
drivers/gpu/drm/i915/gvt/kvmgt.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 074c4efb58eb..811cee28ae06 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -131,6 +131,7 @@ struct kvmgt_vdev {
struct work_struct release_work;
atomic_t released;
struct vfio_device *vfio_device;
+ struct vfio_group *vfio_group;
};

static inline struct kvmgt_vdev *kvmgt_vdev(struct intel_vgpu *vgpu)
@@ -792,6 +793,7 @@ static int intel_vgpu_open(struct mdev_device *mdev)
struct kvmgt_vdev *vdev = kvmgt_vdev(vgpu);
unsigned long events;
int ret;
+ struct vfio_group *vfio_group;

vdev->iommu_notifier.notifier_call = intel_vgpu_iommu_notifier;
vdev->group_notifier.notifier_call = intel_vgpu_group_notifier;
@@ -814,6 +816,14 @@ static int intel_vgpu_open(struct mdev_device *mdev)
goto undo_iommu;
}

+ vfio_group = vfio_group_get_external_user_from_dev(mdev_dev(mdev));
+ if (IS_ERR_OR_NULL(vfio_group)) {
+ ret = !vfio_group ? -EFAULT : PTR_ERR(vfio_group);
+ gvt_vgpu_err("vfio_group_get_external_user_from_dev failed\n");
+ goto undo_register;
+ }
+ vdev->vfio_group = vfio_group;
+
/* Take a module reference as mdev core doesn't take
* a reference for vendor driver.
*/
@@ -830,6 +840,10 @@ static int intel_vgpu_open(struct mdev_device *mdev)
return ret;

undo_group:
+ vfio_group_put_external_user(vdev->vfio_group);
+ vdev->vfio_group = NULL;
+
+undo_register:
vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
&vdev->group_notifier);

@@ -884,6 +898,7 @@ static void __intel_vgpu_release(struct intel_vgpu *vgpu)
kvmgt_guest_exit(info);

intel_vgpu_release_msi_eventfd_ctx(vgpu);
+ vfio_group_put_external_user(vdev->vfio_group);

vdev->kvm = NULL;
vgpu->handle = 0;
--
2.17.1
\
 
 \ /
  Last update: 2020-03-13 04:20    [W:0.138 / U:0.396 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site