linux-kernel - Re: [PATCH 1/1] vfio: remove VFIO_GROUP_NOTIFY_SET

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Date:   Wed, 18 May 2022 00:47:53 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Matthew Rosato <mjrosato@...ux.ibm.com>
Cc:     jgg@...dia.com, alex.williamson@...hat.com, cohuck@...hat.com,
        borntraeger@...ux.ibm.com, jjherne@...ux.ibm.com,
        akrowiak@...ux.ibm.com, pasic@...ux.ibm.com,
        zhenyuw@...ux.intel.com, zhi.a.wang@...el.com, hch@...radead.org,
        intel-gfx@...ts.freedesktop.org,
        intel-gvt-dev@...ts.freedesktop.org, linux-s390@...r.kernel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] vfio: remove VFIO_GROUP_NOTIFY_SET_KVM

With this the release_work in gvt can go away as well:

diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
index 633acfcf76bf2..aee1a45da74bc 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.h
+++ b/drivers/gpu/drm/i915/gvt/gvt.h
@@ -227,7 +227,6 @@ struct intel_vgpu {
 	struct mutex cache_lock;
 
 	struct notifier_block iommu_notifier;
-	struct work_struct release_work;
 	atomic_t released;
 
 	struct kvm_page_track_notifier_node track_node;
diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index b317ae4cc7d2d..917617d7599a9 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -228,8 +228,6 @@ static void intel_gvt_cleanup_vgpu_type_groups(struct intel_gvt *gvt)
 	}
 }
 
-static void intel_vgpu_release_work(struct work_struct *work);
-
 static void gvt_unpin_guest_page(struct intel_vgpu *vgpu, unsigned long gfn,
 		unsigned long size)
 {
@@ -850,8 +848,9 @@ static void intel_vgpu_release_msi_eventfd_ctx(struct intel_vgpu *vgpu)
 	}
 }
 
-static void __intel_vgpu_release(struct intel_vgpu *vgpu)
+static void intel_vgpu_close_device(struct vfio_device *vfio_dev)
 {
+	struct intel_vgpu *vgpu = vfio_dev_to_vgpu(vfio_dev);
 	struct drm_i915_private *i915 = vgpu->gvt->gt->i915;
 	int ret;
 
@@ -880,19 +879,6 @@ static void __intel_vgpu_release(struct intel_vgpu *vgpu)
 	vgpu->attached = false;
 }
 
-static void intel_vgpu_close_device(struct vfio_device *vfio_dev)
-{
-	__intel_vgpu_release(vfio_dev_to_vgpu(vfio_dev));
-}
-
-static void intel_vgpu_release_work(struct work_struct *work)
-{
-	struct intel_vgpu *vgpu =
-		container_of(work, struct intel_vgpu, release_work);
-
-	__intel_vgpu_release(vgpu);
-}
-
 static u64 intel_vgpu_get_bar_addr(struct intel_vgpu *vgpu, int bar)
 {
 	u32 start_lo, start_hi;
@@ -1639,7 +1625,6 @@ static int intel_vgpu_probe(struct mdev_device *mdev)
 		return PTR_ERR(vgpu);
 	}
 
-	INIT_WORK(&vgpu->release_work, intel_vgpu_release_work);
 	vfio_init_group_dev(&vgpu->vfio_device, &mdev->dev,
 			    &intel_vgpu_dev_ops);