diff options
| author | Gerd Hoffmann <kraxel@redhat.com> | 2019-02-08 15:04:09 +0100 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2019-02-11 14:44:10 +1000 |
| commit | 16065fcdd19ddb9e093192914ac863884f308766 (patch) | |
| tree | 29c369003e067cd02fd93ded26d66d4f1619787d | |
| parent | f4bc54b532a62d8bee421ca06adb6d1b3e7ffaa9 (diff) | |
drm/virtio: do NOT reuse resource ids
Bisected guest kernel changes crashing qemu. Landed at
"6c1cd97bda drm/virtio: fix resource id handling". Looked again, and
noticed we where not only leaking *some* ids, but *all* ids. The old
code never ever called virtio_gpu_resource_id_put().
So, commit 6c1cd97bda effectively makes the linux kernel starting
re-using IDs after releasing them, and apparently virglrenderer can't
deal with that. Oops.
This patch puts a temporary stopgap into place for the 5.0 release.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190208140409.15280-1-kraxel@redhat.com
| -rw-r--r-- | drivers/gpu/drm/virtio/virtgpu_object.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c index f39a183d59c2..e7e946035027 100644 --- a/drivers/gpu/drm/virtio/virtgpu_object.c +++ b/drivers/gpu/drm/virtio/virtgpu_object.c @@ -28,10 +28,21 @@ static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev, uint32_t *resid) { +#if 0 int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL); if (handle < 0) return handle; +#else + static int handle; + + /* + * FIXME: dirty hack to avoid re-using IDs, virglrenderer + * can't deal with that. Needs fixing in virglrenderer, also + * should figure a better way to handle that in the guest. + */ + handle++; +#endif *resid = handle + 1; return 0; @@ -39,7 +50,9 @@ static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev, static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id) { +#if 0 ida_free(&vgdev->resource_ida, id - 1); +#endif } static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo) |