Add support for blob resources, enable support for Venus and gfxstream

vhost-device-gpu/Cargo.toml

@@ -28,9 +28,9 @@ log = "0.4"
 [target.'cfg(not(target_env = "musl"))'.dependencies]
 rutabaga_gfx = "0.1.75"
 thiserror = "2.0.17"
-virglrenderer = {version = "0.1.2", optional = true }
-vhost = { version = "0.15.0", features = ["vhost-user-backend"] }
-vhost-user-backend = "0.21"
+virglrenderer = { git = "https://gitlab.freedesktop.org/mtjhrc/virglrenderer-rs.git", branch = "map_info", optional = true }
+vhost = { git = "https://github.com/mtjhrc/vhost.git", branch = "shmem", features = ["vhost-user-backend"] }
+vhost-user-backend = { git = "https://github.com/mtjhrc/vhost.git", branch = "shmem" }
 virtio-bindings = "0.2.5"
 virtio-queue = "0.17.0"
 vm-memory = "0.17.1"

vhost-device-gpu/src/backend/common.rs

@@ -2,12 +2,16 @@
 //
 // SPDX-License-Identifier: Apache-2.0 or BSD-3-Clause
 
-use std::sync::{Arc, Mutex};
+use std::{
+    os::fd::{AsFd, AsRawFd},
+    sync::{Arc, Mutex},
+};
 
-use log::{debug, error};
+use log::{debug, error, trace};
 use vhost::vhost_user::{
     gpu_message::{VhostUserGpuCursorPos, VhostUserGpuCursorUpdate, VhostUserGpuEdidRequest},
-    GpuBackend,
+    message::{VhostUserMMap, VhostUserMMapFlags},
+    Backend, GpuBackend, VhostUserFrontendReqHandler,
 };
 use vm_memory::VolatileSlice;
 
@@ -21,6 +25,59 @@ use crate::{
     renderer::Renderer,
 };
 
+/// Common helper for mapping blob resources.
+/// Maps a blob resource using the vhost-user backend's shmem_map.
+pub fn common_map_blob(
+    backend: &Backend,
+    flags: VhostUserMMapFlags,
+    handle_fd: &(impl AsFd + AsRawFd),
+    blob_size: u64,
+    offset: u64,
+    resource_id: u32,
+) -> Result<(), GpuResponse> {
+    trace!("Mapping blob resource_id={resource_id} offset={offset} size={blob_size}");
+
+    let map_request = VhostUserMMap {
+        shmid: 0,
+        padding: Default::default(),
+        fd_offset: 0,
+        shm_offset: offset,
+        len: blob_size,
+        flags: flags.bits(),
+    };
+
+    backend.shmem_map(&map_request, handle_fd).map_err(|e| {
+        error!("Failed to mmap by frontend: {e:?}");
+        ErrUnspec
+    })?;
+
+    Ok(())
+}
+
+/// Common helper for unmapping blob resources.
+/// Unmaps a blob resource using the vhost-user backend's shmem_unmap.
+pub fn common_unmap_blob(
+    backend: &Backend,
+    blob_size: u64,
+    offset: u64,
+) -> Result<(), GpuResponse> {
+    let unmap_request = VhostUserMMap {
+        shmid: 0,
+        padding: Default::default(),
+        fd_offset: 0,
+        shm_offset: offset,
+        len: blob_size,
+        flags: 0,
+    };
+
+    backend.shmem_unmap(&unmap_request).map_err(|e| {
+        error!("Failed to unmap by frontend: {e:?}");
+        ErrUnspec
+    })?;
+
+    Ok(())
+}
+
 #[derive(Debug, Clone)]
 pub struct VirtioGpuScanout {
     pub resource_id: u32,