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Re: [QEMU PATCH v5 09/13] virtio-gpu: Handle resource blob commands

From: Huang Rui
Subject: Re: [QEMU PATCH v5 09/13] virtio-gpu: Handle resource blob commands
Date: Wed, 20 Sep 2023 16:41:44 +0800 
On Tue, Sep 19, 2023 at 04:44:01PM +0800, Marc-André Lureau wrote:
> Hi
> 
> On Fri, Sep 15, 2023 at 3:14 PM Huang Rui <ray.huang@amd.com> wrote:
> >
> > From: Antonio Caggiano <antonio.caggiano@collabora.com>
> >
> > Support BLOB resources creation, mapping and unmapping by calling the
> > new stable virglrenderer 0.10 interface. Only enabled when available and
> > via the blob config. E.g. -device virtio-vga-gl,blob=true
> >
> > Signed-off-by: Antonio Caggiano <antonio.caggiano@collabora.com>
> > Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
> > Signed-off-by: Xenia Ragiadakou <xenia.ragiadakou@amd.com>
> > Signed-off-by: Huang Rui <ray.huang@amd.com>
> > ---
> >
> > V4 -> V5:
> >     - Use memory_region_init_ram_ptr() instead of
> >       memory_region_init_ram_device_ptr() (Akihiko)
> >
> >  hw/display/virtio-gpu-virgl.c  | 213 +++++++++++++++++++++++++++++++++
> >  hw/display/virtio-gpu.c        |   4 +-
> >  include/hw/virtio/virtio-gpu.h |   5 +
> >  meson.build                    |   4 +
> >  4 files changed, 225 insertions(+), 1 deletion(-)
> >
> > diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
> > index 312953ec16..563a6f2f58 100644
> > --- a/hw/display/virtio-gpu-virgl.c
> > +++ b/hw/display/virtio-gpu-virgl.c
> > @@ -17,6 +17,7 @@
> >  #include "trace.h"
> >  #include "hw/virtio/virtio.h"
> >  #include "hw/virtio/virtio-gpu.h"
> > +#include "hw/virtio/virtio-gpu-bswap.h"
> >
> >  #include "ui/egl-helpers.h"
> >
> > @@ -78,9 +79,24 @@ static void virgl_cmd_create_resource_3d(VirtIOGPU *g,
> >      virgl_renderer_resource_create(&args, NULL, 0);
> >  }
> >
> > +static void virgl_resource_destroy(VirtIOGPU *g,
> > +                                   struct virtio_gpu_simple_resource *res)
> > +{
> > +    if (!res)
> > +        return;
> > +
> 
> QEMU coding style imposes braces
> 

Thanks for reminder.

> > +    QTAILQ_REMOVE(&g->reslist, res, next);
> > +
> > +    virtio_gpu_cleanup_mapping_iov(g, res->iov, res->iov_cnt);
> > +    g_free(res->addrs);
> > +
> > +    g_free(res);
> 
> If you embed virtio_gpu_simple_resource in a new struct, we should
> instead call the existing virtio_gpu_resource_destroy() I guess.

Yes, but I didn't call virtio_gpu_resource_destroy() here, I am using the
virgl_resource_destroy() and the input should be the virgl resource in next
version. May I know whether I miss understood your point?

> 
> > +}
> > +
> >  static void virgl_cmd_resource_unref(VirtIOGPU *g,
> >                                       struct virtio_gpu_ctrl_command *cmd)
> >  {
> > +    struct virtio_gpu_simple_resource *res;
> >      struct virtio_gpu_resource_unref unref;
> >      struct iovec *res_iovs = NULL;
> >      int num_iovs = 0;
> > @@ -88,13 +104,22 @@ static void virgl_cmd_resource_unref(VirtIOGPU *g,
> >      VIRTIO_GPU_FILL_CMD(unref);
> >      trace_virtio_gpu_cmd_res_unref(unref.resource_id);
> >
> > +    res = virtio_gpu_find_resource(g, unref.resource_id);
> > +
> >      virgl_renderer_resource_detach_iov(unref.resource_id,
> >                                         &res_iovs,
> >                                         &num_iovs);
> >      if (res_iovs != NULL && num_iovs != 0) {
> >          virtio_gpu_cleanup_mapping_iov(g, res_iovs, num_iovs);
> > +        if (res) {
> > +            res->iov = NULL;
> > +            res->iov_cnt = 0;
> > +        }
> >      }
> > +
> >      virgl_renderer_resource_unref(unref.resource_id);
> > +
> > +    virgl_resource_destroy(g, res);
> >  }
> >
> >  static void virgl_cmd_context_create(VirtIOGPU *g,
> > @@ -426,6 +451,183 @@ static void virgl_cmd_get_capset(VirtIOGPU *g,
> >      g_free(resp);
> >  }
> >
> > +#ifdef HAVE_VIRGL_RESOURCE_BLOB
> > +
> > +static void virgl_cmd_resource_create_blob(VirtIOGPU *g,
> > +                                           struct virtio_gpu_ctrl_command 
> > *cmd)
> > +{
> > +    struct virtio_gpu_simple_resource *res;
> > +    struct virtio_gpu_resource_create_blob cblob;
> > +    struct virgl_renderer_resource_create_blob_args virgl_args = { 0 };
> > +    int ret;
> > +
> > +    VIRTIO_GPU_FILL_CMD(cblob);
> > +    virtio_gpu_create_blob_bswap(&cblob);
> > +    trace_virtio_gpu_cmd_res_create_blob(cblob.resource_id, cblob.size);
> > +
> > +    if (cblob.resource_id == 0) {
> > +        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource id 0 is not 
> > allowed\n",
> > +                      __func__);
> > +        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
> > +        return;
> > +    }
> > +
> > +    res = virtio_gpu_find_resource(g, cblob.resource_id);
> > +    if (res) {
> > +        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource already exists %d\n",
> > +                      __func__, cblob.resource_id);
> > +        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
> > +        return;
> > +    }
> > +
> > +    res = g_new0(struct virtio_gpu_simple_resource, 1);
> > +    if (!res) {
> > +        cmd->error = VIRTIO_GPU_RESP_ERR_OUT_OF_MEMORY;
> > +        return;
> 
> needless error handling, glib will abort() on OOM.

OK, I will remove all simliar error handling in next version.

> 
> > +    }
> > +
> > +    res->resource_id = cblob.resource_id;
> > +    res->blob_size = cblob.size;
> > +
> > +    if (cblob.blob_mem != VIRTIO_GPU_BLOB_MEM_HOST3D) {
> > +        ret = virtio_gpu_create_mapping_iov(g, cblob.nr_entries, 
> > sizeof(cblob),
> > +                                            cmd, &res->addrs, &res->iov,
> > +                                            &res->iov_cnt);
> > +        if (!ret) {
> > +            g_free(res);
> > +            cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
> > +            return;
> > +        }
> > +    }
> > +
> > +    QTAILQ_INSERT_HEAD(&g->reslist, res, next);
> > +
> > +    virgl_args.res_handle = cblob.resource_id;
> > +    virgl_args.ctx_id = cblob.hdr.ctx_id;
> > +    virgl_args.blob_mem = cblob.blob_mem;
> > +    virgl_args.blob_id = cblob.blob_id;
> > +    virgl_args.blob_flags = cblob.blob_flags;
> > +    virgl_args.size = cblob.size;
> > +    virgl_args.iovecs = res->iov;
> > +    virgl_args.num_iovs = res->iov_cnt;
> > +
> > +    ret = virgl_renderer_resource_create_blob(&virgl_args);
> > +    if (ret) {
> > +        virgl_resource_destroy(g, res);
> > +        qemu_log_mask(LOG_GUEST_ERROR, "%s: virgl blob create error: %s\n",
> > +                      __func__, strerror(-ret));
> > +        cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
> > +    }
> > +}
> > +
> > +static void virgl_cmd_resource_map_blob(VirtIOGPU *g,
> > +                                        struct virtio_gpu_ctrl_command 
> > *cmd)
> > +{
> > +    struct virtio_gpu_simple_resource *res;
> > +    struct virtio_gpu_resource_map_blob mblob;
> > +    int ret;
> > +    void *data;
> > +    uint64_t size;
> > +    struct virtio_gpu_resp_map_info resp;
> > +    VirtIOGPUBase *b = VIRTIO_GPU_BASE(g);
> > +
> > +    VIRTIO_GPU_FILL_CMD(mblob);
> > +    virtio_gpu_map_blob_bswap(&mblob);
> > +
> > +    if (mblob.resource_id == 0) {
> > +        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource id 0 is not 
> > allowed\n",
> > +                      __func__);
> > +        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
> > +        return;
> > +    }
> > +
> > +    res = virtio_gpu_find_resource(g, mblob.resource_id);
> > +    if (!res) {
> > +        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource does not exist %d\n",
> > +                      __func__, mblob.resource_id);
> > +        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
> > +        return;
> > +    }
> > +    if (res->region) {
> > +        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource already mapped %d\n",
> > +                     __func__, mblob.resource_id);
> > +        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
> > +        return;
> > +    }
> > +
> > +    ret = virgl_renderer_resource_map(res->resource_id, &data, &size);
> > +    if (ret) {
> > +        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource map error: %s\n",
> > +                      __func__, strerror(-ret));
> > +        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
> > +        return;
> > +    }
> > +
> > +    res->region = g_new0(MemoryRegion, 1);
> > +    if (!res->region) {
> 
> no need for OOM handling here too
> 
> > +        virgl_renderer_resource_unmap(res->resource_id);
> > +        cmd->error = VIRTIO_GPU_RESP_ERR_OUT_OF_MEMORY;
> > +        return;
> > +    }
> > +    memory_region_init_ram_ptr(res->region, OBJECT(g), NULL, size, data);
> > +    OBJECT(res->region)->free = g_free;
> > +    memory_region_add_subregion(&b->hostmem, mblob.offset, res->region);
> > +    memory_region_set_enabled(res->region, true);
> > +
> > +    memset(&resp, 0, sizeof(resp));
> > +    resp.hdr.type = VIRTIO_GPU_RESP_OK_MAP_INFO;
> > +    virgl_renderer_resource_get_map_info(mblob.resource_id, 
> > &resp.map_info);
> > +    virtio_gpu_ctrl_response(g, cmd, &resp.hdr, sizeof(resp));
> > +}
> > +
> > +static int virtio_gpu_virgl_resource_unmap(VirtIOGPU *g,
> > +                                           struct 
> > virtio_gpu_simple_resource
> > +                                           *res)
> > +{
> > +    VirtIOGPUBase *b = VIRTIO_GPU_BASE(g);
> > +
> > +    if (!res) {
> > +        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource already unmapped 
> > %d\n",
> > +                      __func__, res->resource_id);
> > +        return VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
> > +    }
> > +
> > +    memory_region_set_enabled(res->region, false);
> > +    memory_region_del_subregion(&b->hostmem, res->region);
> > +    object_unparent(OBJECT(res->region));
> > +    res->region = NULL;
> > +
> > +    return virgl_renderer_resource_unmap(res->resource_id);
> > +}
> > +
> > +static void virgl_cmd_resource_unmap_blob(VirtIOGPU *g,
> > +                                          struct virtio_gpu_ctrl_command 
> > *cmd)
> > +{
> > +    struct virtio_gpu_simple_resource *res;
> > +    struct virtio_gpu_resource_unmap_blob ublob;
> > +    VIRTIO_GPU_FILL_CMD(ublob);
> > +    virtio_gpu_unmap_blob_bswap(&ublob);
> > +
> > +    if (ublob.resource_id == 0) {
> > +        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource id 0 is not 
> > allowed\n",
> > +                      __func__);
> > +        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
> > +        return;
> > +    }
> > +
> > +    res = virtio_gpu_find_resource(g, ublob.resource_id);
> > +    if (!res) {
> > +        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource does not exist %d\n",
> > +                      __func__, ublob.resource_id);
> > +        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
> > +        return;
> > +    }
> > +
> > +    virtio_gpu_virgl_resource_unmap(g, res);
> > +}
> > +
> > +#endif /* HAVE_VIRGL_RESOURCE_BLOB */
> > +
> >  void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,
> >                                        struct virtio_gpu_ctrl_command *cmd)
> >  {
> > @@ -492,6 +694,17 @@ void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,
> >      case VIRTIO_GPU_CMD_GET_EDID:
> >          virtio_gpu_get_edid(g, cmd);
> >          break;
> > +#ifdef HAVE_VIRGL_RESOURCE_BLOB
> > +    case VIRTIO_GPU_CMD_RESOURCE_CREATE_BLOB:
> > +        virgl_cmd_resource_create_blob(g, cmd);
> > +        break;
> > +    case VIRTIO_GPU_CMD_RESOURCE_MAP_BLOB:
> > +        virgl_cmd_resource_map_blob(g, cmd);
> > +        break;
> > +    case VIRTIO_GPU_CMD_RESOURCE_UNMAP_BLOB:
> > +        virgl_cmd_resource_unmap_blob(g, cmd);
> > +        break;
> > +#endif /* HAVE_VIRGL_RESOURCE_BLOB */
> >      default:
> >          cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
> >          break;
> > diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
> > index 5b7a7eab4f..cc4c1f81bb 100644
> > --- a/hw/display/virtio-gpu.c
> > +++ b/hw/display/virtio-gpu.c
> > @@ -1367,10 +1367,12 @@ void virtio_gpu_device_realize(DeviceState *qdev, 
> > Error **errp)
> >              return;
> >          }
> >
> > +#ifndef HAVE_VIRGL_RESOURCE_BLOB
> >          if (virtio_gpu_virgl_enabled(g->parent_obj.conf)) {
> > -            error_setg(errp, "blobs and virgl are not compatible (yet)");
> > +            error_setg(errp, "Linked virglrenderer does not support blob 
> > resources");
> >              return;
> >          }
> > +#endif
> >      }
> >
> >      if (!virtio_gpu_base_device_realize(qdev,
> > diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
> > index 55973e112f..b9adc28071 100644
> > --- a/include/hw/virtio/virtio-gpu.h
> > +++ b/include/hw/virtio/virtio-gpu.h
> > @@ -58,6 +58,11 @@ struct virtio_gpu_simple_resource {
> >      int dmabuf_fd;
> >      uint8_t *remapped;
> >
> > +#ifdef HAVE_VIRGL_RESOURCE_BLOB
> > +    /* only blob resource needs this region to be mapped as guest mmio */
> > +    MemoryRegion *region;
> > +#endif
> > +
> >      QTAILQ_ENTRY(virtio_gpu_simple_resource) next;
> >  };
> >
> > diff --git a/meson.build b/meson.build
> > index ff20d3c249..f7b744ab82 100644
> > --- a/meson.build
> > +++ b/meson.build
> > @@ -1072,6 +1072,10 @@ if not get_option('virglrenderer').auto() or 
> > have_system or have_vhost_user_gpu
> >                         
> > cc.has_function('virgl_renderer_context_create_with_flags',
> >                                         prefix: '#include 
> > <virglrenderer.h>',
> >                                         dependencies: virgl))
> > +  config_host_data.set('HAVE_VIRGL_RESOURCE_BLOB',
> > +                       
> > cc.has_function('virgl_renderer_resource_create_blob',
> > +                                       prefix: '#include 
> > <virglrenderer.h>',
> > +                                       dependencies: virgl))
> 
> better moved under the if virgl.found() block

Yes, will update.

> 
> >  endif
> >  blkio = not_found
> >  if not get_option('blkio').auto() or have_block
> > --
> > 2.34.1
> >
> >
> 
> 
> -- 
> Marc-André Lureau
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