[RFC QEMU PATCH 03/18] virtio-gpu: Handle resource blob commands

[Huang Rui <ray.huang@xxxxxxx>]

From: Antonio Caggiano <antonio.caggiano@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@xxxxxxxxxxxxx>
---
 hw/display/virtio-gpu-virgl.c        | 168 +++++++++++++++++++++++++++
 hw/display/virtio-gpu.c              |  12 +-
 include/hw/virtio/virtio-gpu-bswap.h |  18 +++
 include/hw/virtio/virtio-gpu.h       |   8 ++
 meson.build                          |   4 +
 5 files changed, 206 insertions(+), 4 deletions(-)

diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
index 73cb92c8d5..9b5e3dc782 100644
--- a/hw/display/virtio-gpu-virgl.c
+++ b/hw/display/virtio-gpu-virgl.c
@@ -16,6 +16,8 @@
 #include "trace.h"
 #include "hw/virtio/virtio.h"
 #include "hw/virtio/virtio-gpu.h"
+#include "hw/virtio/virtio-gpu-bswap.h"
+#include "hw/virtio/virtio-iommu.h"
 
 #include <virglrenderer.h>
 
@@ -398,6 +400,161 @@ 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;
+    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);
+    QTAILQ_INSERT_HEAD(&g->reslist, res, next);
+
+    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 != 0) {
+            cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
+            return;
+        }
+    }
+
+    if (cblob.blob_mem == VIRTIO_GPU_BLOB_MEM_GUEST) {
+        virtio_gpu_init_udmabuf(res);
+    }
+    const struct virgl_renderer_resource_create_blob_args virgl_args = {
+        .res_handle = cblob.resource_id,
+        .ctx_id = cblob.hdr.ctx_id,
+        .blob_mem = cblob.blob_mem,
+        .blob_id = cblob.blob_id,
+        .blob_flags = cblob.blob_flags,
+        .size = cblob.size,
+        .iovecs = res->iov,
+        .num_iovs = res->iov_cnt,
+    };
+    ret = virgl_renderer_resource_create_blob(&virgl_args);
+    if (ret) {
+        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;
+    uint64_t size;
+    struct virtio_gpu_resp_map_info resp;
+
+    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;
+    }
+
+    ret = virgl_renderer_resource_map(res->resource_id, &res->mapped, &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;
+    }
+
+    memory_region_init_ram_device_ptr(&res->region, OBJECT(g), NULL, size, 
res->mapped);
+    memory_region_add_subregion(&g->parent_obj.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));
+}
+
+int virtio_gpu_virgl_resource_unmap(VirtIOGPU *g,
+                                    struct virtio_gpu_simple_resource *res)
+{
+    if (!res->mapped) {
+        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(&g->parent_obj.hostmem, &res->region);
+    object_unparent(OBJECT(&res->region));
+
+    res->mapped = 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)
 {
@@ -464,6 +621,17 @@ 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 7b592f998d..95d1347a2e 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -33,8 +33,6 @@
 
 #define VIRTIO_GPU_VM_VERSION 1
 
-static struct virtio_gpu_simple_resource*
-virtio_gpu_find_resource(VirtIOGPU *g, uint32_t resource_id);
 static struct virtio_gpu_simple_resource *
 virtio_gpu_find_check_resource(VirtIOGPU *g, uint32_t resource_id,
                                bool require_backing,
@@ -115,7 +113,7 @@ static void update_cursor(VirtIOGPU *g, struct 
virtio_gpu_update_cursor *cursor)
                   cursor->resource_id ? 1 : 0);
 }
 
-static struct virtio_gpu_simple_resource *
+struct virtio_gpu_simple_resource *
 virtio_gpu_find_resource(VirtIOGPU *g, uint32_t resource_id)
 {
     struct virtio_gpu_simple_resource *res;
@@ -875,6 +873,10 @@ void virtio_gpu_cleanup_mapping_iov(VirtIOGPU *g,
 static void virtio_gpu_cleanup_mapping(VirtIOGPU *g,
                                        struct virtio_gpu_simple_resource *res)
 {
+    if (res->mapped) {
+        virtio_gpu_virgl_resource_unmap(g, res);
+    }
+
     virtio_gpu_cleanup_mapping_iov(g, res->iov, res->iov_cnt);
     res->iov = NULL;
     res->iov_cnt = 0;
@@ -1324,10 +1326,12 @@ 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-bswap.h 
b/include/hw/virtio/virtio-gpu-bswap.h
index 9124108485..dd1975e2d4 100644
--- a/include/hw/virtio/virtio-gpu-bswap.h
+++ b/include/hw/virtio/virtio-gpu-bswap.h
@@ -63,10 +63,28 @@ virtio_gpu_create_blob_bswap(struct 
virtio_gpu_resource_create_blob *cblob)
 {
     virtio_gpu_ctrl_hdr_bswap(&cblob->hdr);
     le32_to_cpus(&cblob->resource_id);
+    le32_to_cpus(&cblob->blob_mem);
     le32_to_cpus(&cblob->blob_flags);
+    le32_to_cpus(&cblob->nr_entries);
+    le64_to_cpus(&cblob->blob_id);
     le64_to_cpus(&cblob->size);
 }
 
+static inline void
+virtio_gpu_map_blob_bswap(struct virtio_gpu_resource_map_blob *mblob)
+{
+    virtio_gpu_ctrl_hdr_bswap(&mblob->hdr);
+    le32_to_cpus(&mblob->resource_id);
+    le64_to_cpus(&mblob->offset);
+}
+
+static inline void
+virtio_gpu_unmap_blob_bswap(struct virtio_gpu_resource_unmap_blob *ublob)
+{
+    virtio_gpu_ctrl_hdr_bswap(&ublob->hdr);
+    le32_to_cpus(&ublob->resource_id);
+}
+
 static inline void
 virtio_gpu_scanout_blob_bswap(struct virtio_gpu_set_scanout_blob *ssb)
 {
diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
index eafce75b04..caca834680 100644
--- a/include/hw/virtio/virtio-gpu.h
+++ b/include/hw/virtio/virtio-gpu.h
@@ -55,6 +55,9 @@ struct virtio_gpu_simple_resource {
     int dmabuf_fd;
     uint8_t *remapped;
 
+    MemoryRegion region;
+    void *mapped;
+
     QTAILQ_ENTRY(virtio_gpu_simple_resource) next;
 };
 
@@ -245,6 +248,9 @@ void virtio_gpu_base_fill_display_info(VirtIOGPUBase *g,
                         struct virtio_gpu_resp_display_info *dpy_info);
 
 /* virtio-gpu.c */
+struct virtio_gpu_simple_resource *
+virtio_gpu_find_resource(VirtIOGPU *g, uint32_t resource_id);
+
 void virtio_gpu_ctrl_response(VirtIOGPU *g,
                               struct virtio_gpu_ctrl_command *cmd,
                               struct virtio_gpu_ctrl_hdr *resp,
@@ -289,5 +295,7 @@ void virtio_gpu_virgl_reset_scanout(VirtIOGPU *g);
 void virtio_gpu_virgl_reset(VirtIOGPU *g);
 int virtio_gpu_virgl_init(VirtIOGPU *g);
 int virtio_gpu_virgl_get_num_capsets(VirtIOGPU *g);
+int virtio_gpu_virgl_resource_unmap(VirtIOGPU *g,
+                                    struct virtio_gpu_simple_resource *res);
 
 #endif
diff --git a/meson.build b/meson.build
index 5c6b5a1c75..be74b653b6 100644
--- a/meson.build
+++ b/meson.build
@@ -774,6 +774,10 @@ if not get_option('virglrenderer').auto() or have_system 
or have_vhost_user_gpu
                      method: 'pkg-config',
                      required: get_option('virglrenderer'),
                      kwargs: static_kwargs)
+  config_host_data.set('HAVE_VIRGL_RESOURCE_BLOB',
+                      cc.has_function('virgl_renderer_resource_create_blob',
+                                      prefix: '#include <virglrenderer.h>',
+                                      dependencies: virgl))
 endif
 blkio = not_found
 if not get_option('blkio').auto() or have_block
-- 
2.25.1