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@xxxxxxxxxxxxxxx> Cc: Zhi Wang <zhi.a.wang@xxxxxxxxx> Cc: Kevin Tian <kevin.tian@xxxxxxxxx> Cc: intel-gvt-dev@xxxxxxxxxxxxxxxxxxxxx Reviewed-by: Zhi Wang <zhi.a.wang@xxxxxxxxx> Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx> --- 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) -- 2.34.1
