From: Yan Zhao <yan.y.zhao@intel.com>
To: intel-gvt-dev@lists.freedesktop.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: alex.williamson@redhat.com, zhenyuw@linux.intel.com,
pbonzini@redhat.com, kevin.tian@intel.com, peterx@redhat.com,
Yan Zhao <yan.y.zhao@intel.com>
Subject: [PATCH v4 4/7] drm/i915/gvt: hold reference of VFIO group during opening of vgpu
Date: Thu, 12 Mar 2020 23:10:25 -0400 [thread overview]
Message-ID: <20200313031025.7936-1-yan.y.zhao@intel.com> (raw)
In-Reply-To: <20200313030548.7705-1-yan.y.zhao@intel.com>
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
next prev parent reply other threads:[~2020-03-13 3:20 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-13 3:05 [PATCH v4 0/7] use vfio_dma_rw to read/write IOVAs from CPU side Yan Zhao
2020-03-13 3:07 ` [PATCH v4 1/7] vfio: allow external user to get vfio group from device Yan Zhao
2020-03-13 3:09 ` [PATCH v4 2/7] vfio: introduce vfio_dma_rw to read/write a range of IOVAs Yan Zhao
2020-04-05 16:17 ` Kees Cook
2020-04-07 3:48 ` Yan Zhao
2020-03-13 3:09 ` [PATCH v4 3/7] vfio: avoid inefficient operations on VFIO group in vfio_pin/unpin_pages Yan Zhao
2020-03-13 3:10 ` Yan Zhao [this message]
2020-03-13 3:11 ` [PATCH v4 5/7] drm/i915/gvt: subsitute kvm_read/write_guest with vfio_dma_rw Yan Zhao
2020-03-13 3:11 ` [PATCH v4 6/7] drm/i915/gvt: switch to user vfio_group_pin/upin_pages Yan Zhao
2020-03-13 3:12 ` [PATCH v4 7/7] drm/i915/gvt: rw more pages a time for shadow context Yan Zhao
2020-03-16 3:23 ` Zhenyu Wang
2020-03-13 22:29 ` [PATCH v4 0/7] use vfio_dma_rw to read/write IOVAs from CPU side Alex Williamson
2020-03-15 23:56 ` Yan Zhao
2020-03-16 3:24 ` Zhenyu Wang
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