[[iommufd] PATCH v3 1/2] i915/gvt: Move gvt mapping cache initialization to intel_vgpu_init_dev()
Zhenyu Wang
zhenyuw at linux.intel.com
Mon Dec 5 02:07:08 UTC 2022
On 2022.12.02 05:54:01 -0800, Yi Liu wrote:
> vfio container registers .dma_unmap() callback after the device is opened.
> So it's fine for mdev drivers to initialize internal mapping cache in
> .open_device(). See vfio_device_container_register().
>
> Now with iommufd an access ops with an unmap callback is registered
> when the device is bound to iommufd which is before .open_device()
> is called. This implies gvt's .dma_unmap() could be called before its
> internal mapping cache is initialized.
>
> The fix is moving gvt mapping cache initialization to vGPU init. While
> at it also move ptable initialization together.
>
> Cc: Zhenyu Wang <zhenyuw at linux.intel.com>
> Cc: Zhi Wang <zhi.a.wang at intel.com>
> Cc: Kevin Tian <kevin.tian at intel.com>
> Cc: intel-gvt-dev at lists.freedesktop.org
> Reviewed-by: Zhi Wang <zhi.a.wang at intel.com>
> Signed-off-by: Yi Liu <yi.l.liu at intel.com>
> ---
> drivers/gpu/drm/i915/gvt/kvmgt.c | 18 ++++++++++++++----
> 1 file changed, 14 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
> index 7a45e5360caf..aaf0d9e8da95 100644
> --- a/drivers/gpu/drm/i915/gvt/kvmgt.c
> +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
> @@ -671,9 +671,6 @@ static int intel_vgpu_open_device(struct vfio_device *vfio_dev)
>
> vgpu->attached = true;
>
> - kvmgt_protect_table_init(vgpu);
> - gvt_cache_init(vgpu);
> -
> vgpu->track_node.track_write = kvmgt_page_track_write;
> vgpu->track_node.track_flush_slot = kvmgt_page_track_flush_slot;
> kvm_page_track_register_notifier(vgpu->vfio_device.kvm,
> @@ -718,6 +715,11 @@ static void intel_vgpu_close_device(struct vfio_device *vfio_dev)
> kvmgt_protect_table_destroy(vgpu);
> gvt_cache_destroy(vgpu);
>
> + WARN_ON(vgpu->nr_cache_entries);
> +
> + vgpu->gfn_cache = RB_ROOT;
> + vgpu->dma_addr_cache = RB_ROOT;
> +
> intel_vgpu_release_msi_eventfd_ctx(vgpu);
>
> vgpu->attached = false;
> @@ -1451,9 +1453,17 @@ static int intel_vgpu_init_dev(struct vfio_device *vfio_dev)
> struct intel_vgpu *vgpu = vfio_dev_to_vgpu(vfio_dev);
> struct intel_vgpu_type *type =
> container_of(mdev->type, struct intel_vgpu_type, type);
> + int ret;
>
> vgpu->gvt = kdev_to_i915(mdev->type->parent->dev)->gvt;
> - return intel_gvt_create_vgpu(vgpu, type->conf);
> + ret = intel_gvt_create_vgpu(vgpu, type->conf);
> + if (ret)
> + return ret;
> +
> + kvmgt_protect_table_init(vgpu);
> + gvt_cache_init(vgpu);
> +
> + return 0;
> }
>
> static void intel_vgpu_release_dev(struct vfio_device *vfio_dev)
> --
Reviewed-by: Zhenyu Wang <zhenyuw at linux.intel.com>
thanks!
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