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drm/i915/gvt: hold reference of VFIO group during opening of vgpu 

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>
Reviewed-by: Zhenyu Wang<zhenyuw@linux.intel.com>
Signed-off-by: Zhenyu Wang<zhenyuw@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20200313031025.7936-1-yan.y.zhao@intel.com
This commit is contained in:
Yan Zhao 2020-03-12 23:10:25 -04:00 committed by Zhenyu Wang
parent bcad588dea
commit 776d95b768
1 changed files with 15 additions and 0 deletions
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15
drivers/gpu/drm/i915/gvt/kvmgt.c
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@ -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;