[PATCH v2 0/3] Fix resource freeing bugs in virtio-gpu-rutabaga

[PATCH v2 0/3] Fix resource freeing bugs in virtio-gpu-rutabaga

[Manos Pitsidianakis]

While testing the rutabaga gpu device, we noticed that if the device is
reset, it stops working and complains about missing resource ids. A
quick investigation discovered that the generic VirtIOGPU implementation
frees all resources, but for Rutabaga, they are tied with rutabaga
objects that need to be destroyed as well.

This series adds a resource_destroy class method that the Rutabaga
device can override and do its own bookkeeping.

v1 -> v2 differences:
- addressed review comments re: using the Error API for the
  resource_destroy method.

Manos Pitsidianakis (3):
  hw/display/virtio-gpu.c: use reset_bh class method
  virtio-gpu.c: add resource_destroy class method
  virtio-gpu-rutabaga.c: override resource_destroy method

 include/hw/virtio/virtio-gpu.h   |  3 ++
 hw/display/virtio-gpu-rutabaga.c | 51 ++++++++++++++++++++++++--------
 hw/display/virtio-gpu.c          | 27 ++++++++++++++---
 3 files changed, 65 insertions(+), 16 deletions(-)


base-commit: 7a1dc45af581d2b643cdbf33c01fd96271616fbd
-- 
γαῖα πυρί μιχθήτω

[PATCH v2 1/3] hw/display/virtio-gpu.c: use reset_bh class method

[Manos Pitsidianakis]

While the VirtioGPU type has a reset_bh field to specify a reset
callback, it's never used. virtio_gpu_reset() calls the general
virtio_gpu_reset_bh() function for all devices that inherit from
VirtioGPU.

While no devices override reset_bh at the moment, a device reset might
require special logic for implementations in the future.

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
---
 hw/display/virtio-gpu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index f8a675eb30..2b73ae585b 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -1515,7 +1515,7 @@ void virtio_gpu_reset(VirtIODevice *vdev)
             qemu_cond_wait_bql(&g->reset_cond);
         }
     } else {
-        virtio_gpu_reset_bh(g);
+        aio_bh_call(g->reset_bh);
     }
 
     while (!QTAILQ_EMPTY(&g->cmdq)) {
-- 
γαῖα πυρί μιχθήτω

[PATCH v2 2/3] virtio-gpu.c: add resource_destroy class method

[Manos Pitsidianakis]

When destroying/unrefing resources, devices such as virtio-gpu-rutabaga
need to do their own bookkeeping (free rutabaga resources that are
associated with the virtio_gpu_simple_resource).

This commit adds a class method so that virtio-gpu-rutabaga can override
it in the next commit.

Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
---
 include/hw/virtio/virtio-gpu.h |  3 +++
 hw/display/virtio-gpu.c        | 25 ++++++++++++++++++++++---
 2 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
index 584ba2ed73..b28e7ef0d2 100644
--- a/include/hw/virtio/virtio-gpu.h
+++ b/include/hw/virtio/virtio-gpu.h
@@ -219,6 +219,9 @@ struct VirtIOGPUClass {
     void (*update_cursor_data)(VirtIOGPU *g,
                                struct virtio_gpu_scanout *s,
                                uint32_t resource_id);
+    void (*resource_destroy)(VirtIOGPU *g,
+                             struct virtio_gpu_simple_resource *res,
+                             Error **errp);
 };
 
 struct VirtIOGPUGL {
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index 2b73ae585b..1c1ee230b3 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -402,7 +402,8 @@ static void virtio_gpu_disable_scanout(VirtIOGPU *g, int scanout_id)
 }
 
 static void virtio_gpu_resource_destroy(VirtIOGPU *g,
-                                        struct virtio_gpu_simple_resource *res)
+                                        struct virtio_gpu_simple_resource *res,
+                                        Error **errp)
 {
     int i;
 
@@ -438,7 +439,11 @@ static void virtio_gpu_resource_unref(VirtIOGPU *g,
         cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
         return;
     }
-    virtio_gpu_resource_destroy(g, res);
+    /*
+     * virtio_gpu_resource_destroy does not set any errors, so pass a NULL errp
+     * to ignore them.
+     */
+    virtio_gpu_resource_destroy(g, res, NULL);
 }
 
 static void virtio_gpu_transfer_to_host_2d(VirtIOGPU *g,
@@ -1488,11 +1493,24 @@ static void virtio_gpu_device_unrealize(DeviceState *qdev)
 static void virtio_gpu_reset_bh(void *opaque)
 {
     VirtIOGPU *g = VIRTIO_GPU(opaque);
+    VirtIOGPUClass *vgc = VIRTIO_GPU_GET_CLASS(g);
     struct virtio_gpu_simple_resource *res, *tmp;
+    uint32_t resource_id;
+    Error *local_err = NULL;
     int i = 0;
 
     QTAILQ_FOREACH_SAFE(res, &g->reslist, next, tmp) {
-        virtio_gpu_resource_destroy(g, res);
+        resource_id = res->resource_id;
+        vgc->resource_destroy(g, res, &local_err);
+        if (local_err) {
+            error_append_hint(&local_err, "%s: %s resource_destroy"
+                              "for resource_id = %"PRIu32" failed.\n",
+                              __func__, object_get_typename(OBJECT(g)),
+                              resource_id);
+            /* error_report_err frees the error object for us */
+            error_report_err(local_err);
+            local_err = NULL;
+        }
     }
 
     for (i = 0; i < g->parent_obj.conf.max_outputs; i++) {
@@ -1632,6 +1650,7 @@ static void virtio_gpu_class_init(ObjectClass *klass, void *data)
     vgc->handle_ctrl = virtio_gpu_handle_ctrl;
     vgc->process_cmd = virtio_gpu_simple_process_cmd;
     vgc->update_cursor_data = virtio_gpu_update_cursor_data;
+    vgc->resource_destroy = virtio_gpu_resource_destroy;
     vgbc->gl_flushed = virtio_gpu_handle_gl_flushed;
 
     vdc->realize = virtio_gpu_device_realize;
-- 
γαῖα πυρί μιχθήτω

[PATCH v2 3/3] virtio-gpu-rutabaga.c: override resource_destroy method

[Manos Pitsidianakis]

When the Rutabaga GPU device frees resources, it calls
rutabaga_resource_unref for that resource_id. However, when the generic
VirtIOGPU functions destroys resources, it only removes the
virtio_gpu_simple_resource from the device's VirtIOGPU->reslist list.
The rutabaga resource associated with that resource_id is then leaked.

This commit overrides the resource_destroy class method introduced in
the previous commit to fix this.

Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
---
 hw/display/virtio-gpu-rutabaga.c | 51 ++++++++++++++++++++++++--------
 1 file changed, 39 insertions(+), 12 deletions(-)

diff --git a/hw/display/virtio-gpu-rutabaga.c b/hw/display/virtio-gpu-rutabaga.c
index 9e67f9bd51..6ac0776005 100644
--- a/hw/display/virtio-gpu-rutabaga.c
+++ b/hw/display/virtio-gpu-rutabaga.c
@@ -148,14 +148,42 @@ rutabaga_cmd_create_resource_3d(VirtIOGPU *g,
 }
 
 static void
+virtio_gpu_rutabaga_resource_unref(VirtIOGPU *g,
+                                   struct virtio_gpu_simple_resource *res,
+                                   Error **errp)
+{
+    int32_t result;
+    const char *strerror = NULL;
+    VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g);
+
+    result = rutabaga_resource_unref(vr->rutabaga, res->resource_id);
+    if (result) {
+        error_setg(errp, "%s: rutabaga_resource_unref returned %"PRIi32
+                   " for resource_id = %"PRIu32, __func__, result,
+                   res->resource_id);
+        strerror = strerrorname_np((int)result);
+        if (strerror != NULL) {
+            error_append_hint(errp, "%s: %s\n",
+                              strerror, strerrordesc_np((int)result) ? : "");
+        }
+    }
+
+    if (res->image) {
+        pixman_image_unref(res->image);
+    }
+
+    QTAILQ_REMOVE(&g->reslist, res, next);
+    g_free(res);
+}
+
+static void
 rutabaga_cmd_resource_unref(VirtIOGPU *g,
                             struct virtio_gpu_ctrl_command *cmd)
 {
-    int32_t result;
+    int32_t result = 0;
     struct virtio_gpu_simple_resource *res;
     struct virtio_gpu_resource_unref unref;
-
-    VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g);
+    Error *local_err = NULL;
 
     VIRTIO_GPU_FILL_CMD(unref);
 
@@ -164,15 +192,14 @@ rutabaga_cmd_resource_unref(VirtIOGPU *g,
     res = virtio_gpu_find_resource(g, unref.resource_id);
     CHECK(res, cmd);
 
-    result = rutabaga_resource_unref(vr->rutabaga, unref.resource_id);
-    CHECK(!result, cmd);
-
-    if (res->image) {
-        pixman_image_unref(res->image);
+    virtio_gpu_rutabaga_resource_unref(g, res, &local_err);
+    if (local_err) {
+        error_report_err(local_err);
+        /* local_err was freed, do not reuse it. */
+        local_err = NULL;
+        result = 1;
     }
-
-    QTAILQ_REMOVE(&g->reslist, res, next);
-    g_free(res);
+    CHECK(!result, cmd);
 }
 
 static void
@@ -1099,7 +1126,7 @@ static void virtio_gpu_rutabaga_class_init(ObjectClass *klass, void *data)
     vgc->handle_ctrl = virtio_gpu_rutabaga_handle_ctrl;
     vgc->process_cmd = virtio_gpu_rutabaga_process_cmd;
     vgc->update_cursor_data = virtio_gpu_rutabaga_update_cursor;
-
+    vgc->resource_destroy = virtio_gpu_rutabaga_resource_unref;
     vdc->realize = virtio_gpu_rutabaga_realize;
     device_class_set_props(dc, virtio_gpu_rutabaga_properties);
 }
-- 
γαῖα πυρί μιχθήτω

Re: [PATCH v2 3/3] virtio-gpu-rutabaga.c: override resource_destroy method

[Gurchetan Singh]

[-- Attachment #1: Type: text/plain, Size: 3881 bytes --]

On Mon, Jan 29, 2024 at 7:46 AM Manos Pitsidianakis <
manos.pitsidianakis@linaro.org> wrote:

> When the Rutabaga GPU device frees resources, it calls
> rutabaga_resource_unref for that resource_id. However, when the generic
> VirtIOGPU functions destroys resources, it only removes the
> virtio_gpu_simple_resource from the device's VirtIOGPU->reslist list.
> The rutabaga resource associated with that resource_id is then leaked.
>
> This commit overrides the resource_destroy class method introduced in
> the previous commit to fix this.
>
> Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
> ---
>  hw/display/virtio-gpu-rutabaga.c | 51 ++++++++++++++++++++++++--------
>  1 file changed, 39 insertions(+), 12 deletions(-)
>
> diff --git a/hw/display/virtio-gpu-rutabaga.c
> b/hw/display/virtio-gpu-rutabaga.c
> index 9e67f9bd51..6ac0776005 100644
> --- a/hw/display/virtio-gpu-rutabaga.c
> +++ b/hw/display/virtio-gpu-rutabaga.c
> @@ -148,14 +148,42 @@ rutabaga_cmd_create_resource_3d(VirtIOGPU *g,
>  }
>
>  static void
> +virtio_gpu_rutabaga_resource_unref(VirtIOGPU *g,
> +                                   struct virtio_gpu_simple_resource *res,
> +                                   Error **errp)
> +{
> +    int32_t result;
> +    const char *strerror = NULL;
> +    VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g);
> +
> +    result = rutabaga_resource_unref(vr->rutabaga, res->resource_id);
> +    if (result) {
> +        error_setg(errp, "%s: rutabaga_resource_unref returned %"PRIi32
> +                   " for resource_id = %"PRIu32, __func__, result,
> +                   res->resource_id);
> +        strerror = strerrorname_np((int)result);
> +        if (strerror != NULL) {
> +            error_append_hint(errp, "%s: %s\n",
> +                              strerror, strerrordesc_np((int)result) ? :
> "");
> +        }
>

Can't we rely on virtio_gpu_rutabaga_debug_cb(..) to report an error when
the resource ID is not found?



> +    }
> +
> +    if (res->image) {
> +        pixman_image_unref(res->image);
> +    }
> +
> +    QTAILQ_REMOVE(&g->reslist, res, next);
> +    g_free(res);
> +}
> +
> +static void
>  rutabaga_cmd_resource_unref(VirtIOGPU *g,
>                              struct virtio_gpu_ctrl_command *cmd)
>  {
> -    int32_t result;
> +    int32_t result = 0;
>      struct virtio_gpu_simple_resource *res;
>      struct virtio_gpu_resource_unref unref;
> -
> -    VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g);
> +    Error *local_err = NULL;
>
>      VIRTIO_GPU_FILL_CMD(unref);
>
> @@ -164,15 +192,14 @@ rutabaga_cmd_resource_unref(VirtIOGPU *g,
>      res = virtio_gpu_find_resource(g, unref.resource_id);
>      CHECK(res, cmd);
>
> -    result = rutabaga_resource_unref(vr->rutabaga, unref.resource_id);
> -    CHECK(!result, cmd);
> -
> -    if (res->image) {
> -        pixman_image_unref(res->image);
> +    virtio_gpu_rutabaga_resource_unref(g, res, &local_err);
> +    if (local_err) {
> +        error_report_err(local_err);
> +        /* local_err was freed, do not reuse it. */
> +        local_err = NULL;
> +        result = 1;
>      }
> -
> -    QTAILQ_REMOVE(&g->reslist, res, next);
> -    g_free(res);
> +    CHECK(!result, cmd);
>  }
>
>  static void
> @@ -1099,7 +1126,7 @@ static void
> virtio_gpu_rutabaga_class_init(ObjectClass *klass, void *data)
>      vgc->handle_ctrl = virtio_gpu_rutabaga_handle_ctrl;
>      vgc->process_cmd = virtio_gpu_rutabaga_process_cmd;
>      vgc->update_cursor_data = virtio_gpu_rutabaga_update_cursor;
> -
> +    vgc->resource_destroy = virtio_gpu_rutabaga_resource_unref;
>      vdc->realize = virtio_gpu_rutabaga_realize;
>      device_class_set_props(dc, virtio_gpu_rutabaga_properties);
>  }
> --
> γαῖα πυρί μιχθήτω
>
>

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Re: [PATCH v2 3/3] virtio-gpu-rutabaga.c: override resource_destroy method

[Manos Pitsidianakis]

On Tue, 30 Jan 2024 03:26, Gurchetan Singh <gurchetansingh@chromium.org> wrote:
>On Mon, Jan 29, 2024 at 7:46 AM Manos Pitsidianakis <
>manos.pitsidianakis@linaro.org> wrote:
>
>> When the Rutabaga GPU device frees resources, it calls
>> rutabaga_resource_unref for that resource_id. However, when the generic
>> VirtIOGPU functions destroys resources, it only removes the
>> virtio_gpu_simple_resource from the device's VirtIOGPU->reslist list.
>> The rutabaga resource associated with that resource_id is then leaked.
>>
>> This commit overrides the resource_destroy class method introduced in
>> the previous commit to fix this.
>>
>> Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
>> ---
>>  hw/display/virtio-gpu-rutabaga.c | 51 ++++++++++++++++++++++++--------
>>  1 file changed, 39 insertions(+), 12 deletions(-)
>>
>> diff --git a/hw/display/virtio-gpu-rutabaga.c
>> b/hw/display/virtio-gpu-rutabaga.c
>> index 9e67f9bd51..6ac0776005 100644
>> --- a/hw/display/virtio-gpu-rutabaga.c
>> +++ b/hw/display/virtio-gpu-rutabaga.c
>> @@ -148,14 +148,42 @@ rutabaga_cmd_create_resource_3d(VirtIOGPU *g,
>>  }
>>
>>  static void
>> +virtio_gpu_rutabaga_resource_unref(VirtIOGPU *g,
>> +                                   struct virtio_gpu_simple_resource *res,
>> +                                   Error **errp)
>> +{
>> +    int32_t result;
>> +    const char *strerror = NULL;
>> +    VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g);
>> +
>> +    result = rutabaga_resource_unref(vr->rutabaga, res->resource_id);
>> +    if (result) {
>> +        error_setg(errp, "%s: rutabaga_resource_unref returned %"PRIi32
>> +                   " for resource_id = %"PRIu32, __func__, result,
>> +                   res->resource_id);
>> +        strerror = strerrorname_np((int)result);
>> +        if (strerror != NULL) {
>> +            error_append_hint(errp, "%s: %s\n",
>> +                              strerror, strerrordesc_np((int)result) ? :
>> "");
>> +        }
>>
>
>Can't we rely on virtio_gpu_rutabaga_debug_cb(..) to report an error when
>the resource ID is not found?


IIUC that callback is called from the external library, and uses its own 
type (const struct rutabaga *debug) which is not how the interface works 
here. rutabaga_resource_unref() returns an int32_t. Besides this isn't a 
debug print but an error print.

>
>> +    }
>> +
>> +    if (res->image) {
>> +        pixman_image_unref(res->image);
>> +    }
>> +
>> +    QTAILQ_REMOVE(&g->reslist, res, next);
>> +    g_free(res);
>> +}
>> +
>> +static void
>>  rutabaga_cmd_resource_unref(VirtIOGPU *g,
>>                              struct virtio_gpu_ctrl_command *cmd)
>>  {
>> -    int32_t result;
>> +    int32_t result = 0;
>>      struct virtio_gpu_simple_resource *res;
>>      struct virtio_gpu_resource_unref unref;
>> -
>> -    VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g);
>> +    Error *local_err = NULL;
>>
>>      VIRTIO_GPU_FILL_CMD(unref);
>>
>> @@ -164,15 +192,14 @@ rutabaga_cmd_resource_unref(VirtIOGPU *g,
>>      res = virtio_gpu_find_resource(g, unref.resource_id);
>>      CHECK(res, cmd);
>>
>> -    result = rutabaga_resource_unref(vr->rutabaga, unref.resource_id);
>> -    CHECK(!result, cmd);
>> -
>> -    if (res->image) {
>> -        pixman_image_unref(res->image);
>> +    virtio_gpu_rutabaga_resource_unref(g, res, &local_err);
>> +    if (local_err) {
>> +        error_report_err(local_err);
>> +        /* local_err was freed, do not reuse it. */
>> +        local_err = NULL;
>> +        result = 1;
>>      }
>> -
>> -    QTAILQ_REMOVE(&g->reslist, res, next);
>> -    g_free(res);
>> +    CHECK(!result, cmd);
>>  }
>>
>>  static void
>> @@ -1099,7 +1126,7 @@ static void
>> virtio_gpu_rutabaga_class_init(ObjectClass *klass, void *data)
>>      vgc->handle_ctrl = virtio_gpu_rutabaga_handle_ctrl;
>>      vgc->process_cmd = virtio_gpu_rutabaga_process_cmd;
>>      vgc->update_cursor_data = virtio_gpu_rutabaga_update_cursor;
>> -
>> +    vgc->resource_destroy = virtio_gpu_rutabaga_resource_unref;
>>      vdc->realize = virtio_gpu_rutabaga_realize;
>>      device_class_set_props(dc, virtio_gpu_rutabaga_properties);
>>  }
>> --
>> γαῖα πυρί μιχθήτω
>>
>>

Re: [PATCH v2 2/3] virtio-gpu.c: add resource_destroy class method

[Marc-André Lureau]

Hi

On Mon, Jan 29, 2024 at 7:46 PM Manos Pitsidianakis
<manos.pitsidianakis@linaro.org> wrote:
>
> When destroying/unrefing resources, devices such as virtio-gpu-rutabaga
> need to do their own bookkeeping (free rutabaga resources that are
> associated with the virtio_gpu_simple_resource).
>
> This commit adds a class method so that virtio-gpu-rutabaga can override
> it in the next commit.
>
> Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
> ---
>  include/hw/virtio/virtio-gpu.h |  3 +++
>  hw/display/virtio-gpu.c        | 25 ++++++++++++++++++++++---
>  2 files changed, 25 insertions(+), 3 deletions(-)
>
> diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
> index 584ba2ed73..b28e7ef0d2 100644
> --- a/include/hw/virtio/virtio-gpu.h
> +++ b/include/hw/virtio/virtio-gpu.h
> @@ -219,6 +219,9 @@ struct VirtIOGPUClass {
>      void (*update_cursor_data)(VirtIOGPU *g,
>                                 struct virtio_gpu_scanout *s,
>                                 uint32_t resource_id);
> +    void (*resource_destroy)(VirtIOGPU *g,
> +                             struct virtio_gpu_simple_resource *res,
> +                             Error **errp);
>  };
>
>  struct VirtIOGPUGL {
> diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
> index 2b73ae585b..1c1ee230b3 100644
> --- a/hw/display/virtio-gpu.c
> +++ b/hw/display/virtio-gpu.c
> @@ -402,7 +402,8 @@ static void virtio_gpu_disable_scanout(VirtIOGPU *g, int scanout_id)
>  }
>
>  static void virtio_gpu_resource_destroy(VirtIOGPU *g,
> -                                        struct virtio_gpu_simple_resource *res)
> +                                        struct virtio_gpu_simple_resource *res,
> +                                        Error **errp)
>  {
>      int i;
>
> @@ -438,7 +439,11 @@ static void virtio_gpu_resource_unref(VirtIOGPU *g,
>          cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
>          return;
>      }
> -    virtio_gpu_resource_destroy(g, res);
> +    /*
> +     * virtio_gpu_resource_destroy does not set any errors, so pass a NULL errp
> +     * to ignore them.
> +     */
> +    virtio_gpu_resource_destroy(g, res, NULL);

&error_fatal would be better.

>  }
>
>  static void virtio_gpu_transfer_to_host_2d(VirtIOGPU *g,
> @@ -1488,11 +1493,24 @@ static void virtio_gpu_device_unrealize(DeviceState *qdev)
>  static void virtio_gpu_reset_bh(void *opaque)
>  {
>      VirtIOGPU *g = VIRTIO_GPU(opaque);
> +    VirtIOGPUClass *vgc = VIRTIO_GPU_GET_CLASS(g);
>      struct virtio_gpu_simple_resource *res, *tmp;
> +    uint32_t resource_id;
> +    Error *local_err = NULL;
>      int i = 0;
>
>      QTAILQ_FOREACH_SAFE(res, &g->reslist, next, tmp) {
> -        virtio_gpu_resource_destroy(g, res);
> +        resource_id = res->resource_id;
> +        vgc->resource_destroy(g, res, &local_err);
> +        if (local_err) {
> +            error_append_hint(&local_err, "%s: %s resource_destroy"
> +                              "for resource_id = %"PRIu32" failed.\n",
> +                              __func__, object_get_typename(OBJECT(g)),
> +                              resource_id);
> +            /* error_report_err frees the error object for us */
> +            error_report_err(local_err);
> +            local_err = NULL;
> +        }
>      }
>
>      for (i = 0; i < g->parent_obj.conf.max_outputs; i++) {
> @@ -1632,6 +1650,7 @@ static void virtio_gpu_class_init(ObjectClass *klass, void *data)
>      vgc->handle_ctrl = virtio_gpu_handle_ctrl;
>      vgc->process_cmd = virtio_gpu_simple_process_cmd;
>      vgc->update_cursor_data = virtio_gpu_update_cursor_data;
> +    vgc->resource_destroy = virtio_gpu_resource_destroy;
>      vgbc->gl_flushed = virtio_gpu_handle_gl_flushed;
>
>      vdc->realize = virtio_gpu_device_realize;
> --
> γαῖα πυρί μιχθήτω
>

otherwise,
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>

-- 
Marc-André Lureau

Re: [PATCH v2 3/3] virtio-gpu-rutabaga.c: override resource_destroy method

[Marc-André Lureau]

Hi

On Mon, Jan 29, 2024 at 7:46 PM Manos Pitsidianakis
<manos.pitsidianakis@linaro.org> wrote:
>
> When the Rutabaga GPU device frees resources, it calls
> rutabaga_resource_unref for that resource_id. However, when the generic
> VirtIOGPU functions destroys resources, it only removes the
> virtio_gpu_simple_resource from the device's VirtIOGPU->reslist list.
> The rutabaga resource associated with that resource_id is then leaked.
>
> This commit overrides the resource_destroy class method introduced in
> the previous commit to fix this.
>
> Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
> ---
>  hw/display/virtio-gpu-rutabaga.c | 51 ++++++++++++++++++++++++--------
>  1 file changed, 39 insertions(+), 12 deletions(-)
>
> diff --git a/hw/display/virtio-gpu-rutabaga.c b/hw/display/virtio-gpu-rutabaga.c
> index 9e67f9bd51..6ac0776005 100644
> --- a/hw/display/virtio-gpu-rutabaga.c
> +++ b/hw/display/virtio-gpu-rutabaga.c
> @@ -148,14 +148,42 @@ rutabaga_cmd_create_resource_3d(VirtIOGPU *g,
>  }
>
>  static void
> +virtio_gpu_rutabaga_resource_unref(VirtIOGPU *g,
> +                                   struct virtio_gpu_simple_resource *res,
> +                                   Error **errp)
> +{
> +    int32_t result;
> +    const char *strerror = NULL;
> +    VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g);
> +
> +    result = rutabaga_resource_unref(vr->rutabaga, res->resource_id);
> +    if (result) {
> +        error_setg(errp, "%s: rutabaga_resource_unref returned %"PRIi32
> +                   " for resource_id = %"PRIu32, __func__, result,
> +                   res->resource_id);
> +        strerror = strerrorname_np((int)result);
> +        if (strerror != NULL) {
> +            error_append_hint(errp, "%s: %s\n",
> +                              strerror, strerrordesc_np((int)result) ? : "");
> +        }
> +    }

There is error_setg_errno()

> +
> +    if (res->image) {
> +        pixman_image_unref(res->image);
> +    }
> +
> +    QTAILQ_REMOVE(&g->reslist, res, next);
> +    g_free(res);
> +}
> +
> +static void
>  rutabaga_cmd_resource_unref(VirtIOGPU *g,
>                              struct virtio_gpu_ctrl_command *cmd)
>  {
> -    int32_t result;
> +    int32_t result = 0;
>      struct virtio_gpu_simple_resource *res;
>      struct virtio_gpu_resource_unref unref;
> -
> -    VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g);
> +    Error *local_err = NULL;
>
>      VIRTIO_GPU_FILL_CMD(unref);
>
> @@ -164,15 +192,14 @@ rutabaga_cmd_resource_unref(VirtIOGPU *g,
>      res = virtio_gpu_find_resource(g, unref.resource_id);
>      CHECK(res, cmd);
>
> -    result = rutabaga_resource_unref(vr->rutabaga, unref.resource_id);
> -    CHECK(!result, cmd);
> -
> -    if (res->image) {
> -        pixman_image_unref(res->image);
> +    virtio_gpu_rutabaga_resource_unref(g, res, &local_err);
> +    if (local_err) {
> +        error_report_err(local_err);
> +        /* local_err was freed, do not reuse it. */
> +        local_err = NULL;
> +        result = 1;
>      }
> -
> -    QTAILQ_REMOVE(&g->reslist, res, next);
> -    g_free(res);
> +    CHECK(!result, cmd);
>  }
>
>  static void
> @@ -1099,7 +1126,7 @@ static void virtio_gpu_rutabaga_class_init(ObjectClass *klass, void *data)
>      vgc->handle_ctrl = virtio_gpu_rutabaga_handle_ctrl;
>      vgc->process_cmd = virtio_gpu_rutabaga_process_cmd;
>      vgc->update_cursor_data = virtio_gpu_rutabaga_update_cursor;
> -
> +    vgc->resource_destroy = virtio_gpu_rutabaga_resource_unref;
>      vdc->realize = virtio_gpu_rutabaga_realize;
>      device_class_set_props(dc, virtio_gpu_rutabaga_properties);
>  }
> --
> γαῖα πυρί μιχθήτω
>


-- 
Marc-André Lureau

Re: [PATCH v2 3/3] virtio-gpu-rutabaga.c: override resource_destroy method

[Manos Pitsidianakis]

On Tue, 30 Jan 2024 at 14:50, Marc-André Lureau
<marcandre.lureau@gmail.com> wrote:
>
> Hi
>
> On Mon, Jan 29, 2024 at 7:46 PM Manos Pitsidianakis
> <manos.pitsidianakis@linaro.org> wrote:
> >
> > When the Rutabaga GPU device frees resources, it calls
> > rutabaga_resource_unref for that resource_id. However, when the generic
> > VirtIOGPU functions destroys resources, it only removes the
> > virtio_gpu_simple_resource from the device's VirtIOGPU->reslist list.
> > The rutabaga resource associated with that resource_id is then leaked.
> >
> > This commit overrides the resource_destroy class method introduced in
> > the previous commit to fix this.
> >
> > Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
> > ---
> >  hw/display/virtio-gpu-rutabaga.c | 51 ++++++++++++++++++++++++--------
> >  1 file changed, 39 insertions(+), 12 deletions(-)
> >
> > diff --git a/hw/display/virtio-gpu-rutabaga.c b/hw/display/virtio-gpu-rutabaga.c
> > index 9e67f9bd51..6ac0776005 100644
> > --- a/hw/display/virtio-gpu-rutabaga.c
> > +++ b/hw/display/virtio-gpu-rutabaga.c
> > @@ -148,14 +148,42 @@ rutabaga_cmd_create_resource_3d(VirtIOGPU *g,
> >  }
> >
> >  static void
> > +virtio_gpu_rutabaga_resource_unref(VirtIOGPU *g,
> > +                                   struct virtio_gpu_simple_resource *res,
> > +                                   Error **errp)
> > +{
> > +    int32_t result;
> > +    const char *strerror = NULL;
> > +    VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g);
> > +
> > +    result = rutabaga_resource_unref(vr->rutabaga, res->resource_id);
> > +    if (result) {
> > +        error_setg(errp, "%s: rutabaga_resource_unref returned %"PRIi32
> > +                   " for resource_id = %"PRIu32, __func__, result,
> > +                   res->resource_id);
> > +        strerror = strerrorname_np((int)result);
> > +        if (strerror != NULL) {
> > +            error_append_hint(errp, "%s: %s\n",
> > +                              strerror, strerrordesc_np((int)result) ? : "");
> > +        }
> > +    }
>
> There is error_setg_errno()

I did not use it on purpose because I was not certain if rutabaga_gfx
starts using other error numbers in the future. I don't like my
approach but I don't like assuming it's an errno either to be
honest... Which one seems better to you?

Thanks,
Manos

> > +
> > +    if (res->image) {
> > +        pixman_image_unref(res->image);
> > +    }
> > +
> > +    QTAILQ_REMOVE(&g->reslist, res, next);
> > +    g_free(res);
> > +}
> > +
> > +static void
> >  rutabaga_cmd_resource_unref(VirtIOGPU *g,
> >                              struct virtio_gpu_ctrl_command *cmd)
> >  {
> > -    int32_t result;
> > +    int32_t result = 0;
> >      struct virtio_gpu_simple_resource *res;
> >      struct virtio_gpu_resource_unref unref;
> > -
> > -    VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g);
> > +    Error *local_err = NULL;
> >
> >      VIRTIO_GPU_FILL_CMD(unref);
> >
> > @@ -164,15 +192,14 @@ rutabaga_cmd_resource_unref(VirtIOGPU *g,
> >      res = virtio_gpu_find_resource(g, unref.resource_id);
> >      CHECK(res, cmd);
> >
> > -    result = rutabaga_resource_unref(vr->rutabaga, unref.resource_id);
> > -    CHECK(!result, cmd);
> > -
> > -    if (res->image) {
> > -        pixman_image_unref(res->image);
> > +    virtio_gpu_rutabaga_resource_unref(g, res, &local_err);
> > +    if (local_err) {
> > +        error_report_err(local_err);
> > +        /* local_err was freed, do not reuse it. */
> > +        local_err = NULL;
> > +        result = 1;
> >      }
> > -
> > -    QTAILQ_REMOVE(&g->reslist, res, next);
> > -    g_free(res);
> > +    CHECK(!result, cmd);
> >  }
> >
> >  static void
> > @@ -1099,7 +1126,7 @@ static void virtio_gpu_rutabaga_class_init(ObjectClass *klass, void *data)
> >      vgc->handle_ctrl = virtio_gpu_rutabaga_handle_ctrl;
> >      vgc->process_cmd = virtio_gpu_rutabaga_process_cmd;
> >      vgc->update_cursor_data = virtio_gpu_rutabaga_update_cursor;
> > -
> > +    vgc->resource_destroy = virtio_gpu_rutabaga_resource_unref;
> >      vdc->realize = virtio_gpu_rutabaga_realize;
> >      device_class_set_props(dc, virtio_gpu_rutabaga_properties);
> >  }
> > --
> > γαῖα πυρί μιχθήτω
> >
>
>
> --
> Marc-André Lureau

Re: [PATCH v2 3/3] virtio-gpu-rutabaga.c: override resource_destroy method

[Marc-André Lureau]

Hi

On Tue, Jan 30, 2024 at 5:01 PM Manos Pitsidianakis
<manos.pitsidianakis@linaro.org> wrote:
>
> On Tue, 30 Jan 2024 at 14:50, Marc-André Lureau
> <marcandre.lureau@gmail.com> wrote:
> >
> > Hi
> >
> > On Mon, Jan 29, 2024 at 7:46 PM Manos Pitsidianakis
> > <manos.pitsidianakis@linaro.org> wrote:
> > >
> > > When the Rutabaga GPU device frees resources, it calls
> > > rutabaga_resource_unref for that resource_id. However, when the generic
> > > VirtIOGPU functions destroys resources, it only removes the
> > > virtio_gpu_simple_resource from the device's VirtIOGPU->reslist list.
> > > The rutabaga resource associated with that resource_id is then leaked.
> > >
> > > This commit overrides the resource_destroy class method introduced in
> > > the previous commit to fix this.
> > >
> > > Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
> > > ---
> > >  hw/display/virtio-gpu-rutabaga.c | 51 ++++++++++++++++++++++++--------
> > >  1 file changed, 39 insertions(+), 12 deletions(-)
> > >
> > > diff --git a/hw/display/virtio-gpu-rutabaga.c b/hw/display/virtio-gpu-rutabaga.c
> > > index 9e67f9bd51..6ac0776005 100644
> > > --- a/hw/display/virtio-gpu-rutabaga.c
> > > +++ b/hw/display/virtio-gpu-rutabaga.c
> > > @@ -148,14 +148,42 @@ rutabaga_cmd_create_resource_3d(VirtIOGPU *g,
> > >  }
> > >
> > >  static void
> > > +virtio_gpu_rutabaga_resource_unref(VirtIOGPU *g,
> > > +                                   struct virtio_gpu_simple_resource *res,
> > > +                                   Error **errp)
> > > +{
> > > +    int32_t result;
> > > +    const char *strerror = NULL;
> > > +    VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g);
> > > +
> > > +    result = rutabaga_resource_unref(vr->rutabaga, res->resource_id);
> > > +    if (result) {
> > > +        error_setg(errp, "%s: rutabaga_resource_unref returned %"PRIi32
> > > +                   " for resource_id = %"PRIu32, __func__, result,
> > > +                   res->resource_id);
> > > +        strerror = strerrorname_np((int)result);
> > > +        if (strerror != NULL) {
> > > +            error_append_hint(errp, "%s: %s\n",
> > > +                              strerror, strerrordesc_np((int)result) ? : "");
> > > +        }
> > > +    }
> >
> > There is error_setg_errno()
>
> I did not use it on purpose because I was not certain if rutabaga_gfx
> starts using other error numbers in the future. I don't like my
> approach but I don't like assuming it's an errno either to be
> honest... Which one seems better to you?
>

In that case, don't use strerrordesc_np() either :)

I think we can assume they will keep using errno though, unless they
clearly communicate this and break API, which seems unlikely to me.

> Thanks,
> Manos
>
> > > +
> > > +    if (res->image) {
> > > +        pixman_image_unref(res->image);
> > > +    }
> > > +
> > > +    QTAILQ_REMOVE(&g->reslist, res, next);
> > > +    g_free(res);
> > > +}
> > > +
> > > +static void
> > >  rutabaga_cmd_resource_unref(VirtIOGPU *g,
> > >                              struct virtio_gpu_ctrl_command *cmd)
> > >  {
> > > -    int32_t result;
> > > +    int32_t result = 0;
> > >      struct virtio_gpu_simple_resource *res;
> > >      struct virtio_gpu_resource_unref unref;
> > > -
> > > -    VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g);
> > > +    Error *local_err = NULL;
> > >
> > >      VIRTIO_GPU_FILL_CMD(unref);
> > >
> > > @@ -164,15 +192,14 @@ rutabaga_cmd_resource_unref(VirtIOGPU *g,
> > >      res = virtio_gpu_find_resource(g, unref.resource_id);
> > >      CHECK(res, cmd);
> > >
> > > -    result = rutabaga_resource_unref(vr->rutabaga, unref.resource_id);
> > > -    CHECK(!result, cmd);
> > > -
> > > -    if (res->image) {
> > > -        pixman_image_unref(res->image);
> > > +    virtio_gpu_rutabaga_resource_unref(g, res, &local_err);
> > > +    if (local_err) {
> > > +        error_report_err(local_err);
> > > +        /* local_err was freed, do not reuse it. */
> > > +        local_err = NULL;
> > > +        result = 1;
> > >      }
> > > -
> > > -    QTAILQ_REMOVE(&g->reslist, res, next);
> > > -    g_free(res);
> > > +    CHECK(!result, cmd);
> > >  }
> > >
> > >  static void
> > > @@ -1099,7 +1126,7 @@ static void virtio_gpu_rutabaga_class_init(ObjectClass *klass, void *data)
> > >      vgc->handle_ctrl = virtio_gpu_rutabaga_handle_ctrl;
> > >      vgc->process_cmd = virtio_gpu_rutabaga_process_cmd;
> > >      vgc->update_cursor_data = virtio_gpu_rutabaga_update_cursor;
> > > -
> > > +    vgc->resource_destroy = virtio_gpu_rutabaga_resource_unref;
> > >      vdc->realize = virtio_gpu_rutabaga_realize;
> > >      device_class_set_props(dc, virtio_gpu_rutabaga_properties);
> > >  }
> > > --
> > > γαῖα πυρί μιχθήτω
> > >
> >
> >
> > --
> > Marc-André Lureau



-- 
Marc-André Lureau

Re: [PATCH v2 3/3] virtio-gpu-rutabaga.c: override resource_destroy method

[Manos Pitsidianakis]

On Tue, 30 Jan 2024 at 15:10, Marc-André Lureau
<marcandre.lureau@gmail.com> wrote:
>
> Hi
>
> On Tue, Jan 30, 2024 at 5:01 PM Manos Pitsidianakis
> <manos.pitsidianakis@linaro.org> wrote:
> >
> > On Tue, 30 Jan 2024 at 14:50, Marc-André Lureau
> > <marcandre.lureau@gmail.com> wrote:
> > >
> > > Hi
> > >
> > > On Mon, Jan 29, 2024 at 7:46 PM Manos Pitsidianakis
> > > <manos.pitsidianakis@linaro.org> wrote:
> > > >
> > > > When the Rutabaga GPU device frees resources, it calls
> > > > rutabaga_resource_unref for that resource_id. However, when the generic
> > > > VirtIOGPU functions destroys resources, it only removes the
> > > > virtio_gpu_simple_resource from the device's VirtIOGPU->reslist list.
> > > > The rutabaga resource associated with that resource_id is then leaked.
> > > >
> > > > This commit overrides the resource_destroy class method introduced in
> > > > the previous commit to fix this.
> > > >
> > > > Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
> > > > ---
> > > >  hw/display/virtio-gpu-rutabaga.c | 51 ++++++++++++++++++++++++--------
> > > >  1 file changed, 39 insertions(+), 12 deletions(-)
> > > >
> > > > diff --git a/hw/display/virtio-gpu-rutabaga.c b/hw/display/virtio-gpu-rutabaga.c
> > > > index 9e67f9bd51..6ac0776005 100644
> > > > --- a/hw/display/virtio-gpu-rutabaga.c
> > > > +++ b/hw/display/virtio-gpu-rutabaga.c
> > > > @@ -148,14 +148,42 @@ rutabaga_cmd_create_resource_3d(VirtIOGPU *g,
> > > >  }
> > > >
> > > >  static void
> > > > +virtio_gpu_rutabaga_resource_unref(VirtIOGPU *g,
> > > > +                                   struct virtio_gpu_simple_resource *res,
> > > > +                                   Error **errp)
> > > > +{
> > > > +    int32_t result;
> > > > +    const char *strerror = NULL;
> > > > +    VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g);
> > > > +
> > > > +    result = rutabaga_resource_unref(vr->rutabaga, res->resource_id);
> > > > +    if (result) {
> > > > +        error_setg(errp, "%s: rutabaga_resource_unref returned %"PRIi32
> > > > +                   " for resource_id = %"PRIu32, __func__, result,
> > > > +                   res->resource_id);
> > > > +        strerror = strerrorname_np((int)result);
> > > > +        if (strerror != NULL) {
> > > > +            error_append_hint(errp, "%s: %s\n",
> > > > +                              strerror, strerrordesc_np((int)result) ? : "");
> > > > +        }
> > > > +    }
> > >
> > > There is error_setg_errno()
> >
> > I did not use it on purpose because I was not certain if rutabaga_gfx
> > starts using other error numbers in the future. I don't like my
> > approach but I don't like assuming it's an errno either to be
> > honest... Which one seems better to you?
> >
>
> In that case, don't use strerrordesc_np() either :)

strerrordesc_np will be valid if strerrorname_np() does not return NULL.

> I think we can assume they will keep using errno though, unless they
> clearly communicate this and break API, which seems unlikely to me.

I will use error_setg_errno then, thanks!

Manos

> > Thanks,
> > Manos
> >
> > > > +
> > > > +    if (res->image) {
> > > > +        pixman_image_unref(res->image);
> > > > +    }
> > > > +
> > > > +    QTAILQ_REMOVE(&g->reslist, res, next);
> > > > +    g_free(res);
> > > > +}
> > > > +
> > > > +static void
> > > >  rutabaga_cmd_resource_unref(VirtIOGPU *g,
> > > >                              struct virtio_gpu_ctrl_command *cmd)
> > > >  {
> > > > -    int32_t result;
> > > > +    int32_t result = 0;
> > > >      struct virtio_gpu_simple_resource *res;
> > > >      struct virtio_gpu_resource_unref unref;
> > > > -
> > > > -    VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g);
> > > > +    Error *local_err = NULL;
> > > >
> > > >      VIRTIO_GPU_FILL_CMD(unref);
> > > >
> > > > @@ -164,15 +192,14 @@ rutabaga_cmd_resource_unref(VirtIOGPU *g,
> > > >      res = virtio_gpu_find_resource(g, unref.resource_id);
> > > >      CHECK(res, cmd);
> > > >
> > > > -    result = rutabaga_resource_unref(vr->rutabaga, unref.resource_id);
> > > > -    CHECK(!result, cmd);
> > > > -
> > > > -    if (res->image) {
> > > > -        pixman_image_unref(res->image);
> > > > +    virtio_gpu_rutabaga_resource_unref(g, res, &local_err);
> > > > +    if (local_err) {
> > > > +        error_report_err(local_err);
> > > > +        /* local_err was freed, do not reuse it. */
> > > > +        local_err = NULL;
> > > > +        result = 1;
> > > >      }
> > > > -
> > > > -    QTAILQ_REMOVE(&g->reslist, res, next);
> > > > -    g_free(res);
> > > > +    CHECK(!result, cmd);
> > > >  }
> > > >
> > > >  static void
> > > > @@ -1099,7 +1126,7 @@ static void virtio_gpu_rutabaga_class_init(ObjectClass *klass, void *data)
> > > >      vgc->handle_ctrl = virtio_gpu_rutabaga_handle_ctrl;
> > > >      vgc->process_cmd = virtio_gpu_rutabaga_process_cmd;
> > > >      vgc->update_cursor_data = virtio_gpu_rutabaga_update_cursor;
> > > > -
> > > > +    vgc->resource_destroy = virtio_gpu_rutabaga_resource_unref;
> > > >      vdc->realize = virtio_gpu_rutabaga_realize;
> > > >      device_class_set_props(dc, virtio_gpu_rutabaga_properties);
> > > >  }
> > > > --
> > > > γαῖα πυρί μιχθήτω
> > > >
> > >
> > >
> > > --
> > > Marc-André Lureau
>
>
>
> --
> Marc-André Lureau