Enable kernel modules and NVIDIA GPU support

- Enable CONFIG_MODULES, CONFIG_MODULE_UNLOAD, CONFIG_MODVERSIONS
- Enable CONFIG_DRM and CONFIG_DRM_FBDEV_EMULATION for NVIDIA driver
- Add CI workflow steps to build NVIDIA open-gpu-kernel-modules (570.86.16)
- Package and upload nvidia-modules-x86_64.tar.gz as release artifact

This enables GPU passthrough VMs to load NVIDIA kernel modules at boot,
allowing guests to use passed-through GPUs with nvidia-smi and CUDA.

Author: rgarcia

.github/workflows/release.yaml

@@ -28,6 +28,20 @@ jobs:
        run: make ch_defconfig
      - name: Build kernel (x86-64)
        run: CFLAGS="-Wa,-mx86-used-note=no" make bzImage -j `nproc`
+     - name: Build modules (x86-64)
+       run: make modules -j `nproc`
+     - name: Clone NVIDIA open-gpu-kernel-modules
+       run: git clone --depth 1 --branch 570.86.16 https://github.com/NVIDIA/open-gpu-kernel-modules.git
+     - name: Build NVIDIA modules (x86-64)
+       run: |
+         cd open-gpu-kernel-modules
+         make modules KERNEL_UNAME=$(cd .. && make -s kernelrelease) SYSSRC=$(pwd)/.. -j $(nproc)
+     - name: Package NVIDIA modules (x86-64)
+       run: |
+         KVER=$(make -s kernelrelease)
+         mkdir -p nvidia-modules/lib/modules/$KVER/kernel/drivers/gpu
+         cp open-gpu-kernel-modules/kernel-open/*.ko nvidia-modules/lib/modules/$KVER/kernel/drivers/gpu/
+         tar czf nvidia-modules-x86_64.tar.gz -C nvidia-modules .
      - name: Create release
        id: create_release
        uses: actions/create-release@v1
@@ -55,6 +69,15 @@ jobs:
          asset_path: vmlinux
          asset_name: vmlinux-x86_64
          asset_content_type: application/octet-stream
+     - name: Upload NVIDIA modules for x86_64
+       uses: actions/upload-release-asset@v1
+       env:
+         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+       with:
+         upload_url: ${{ steps.create_release.outputs.upload_url }}
+         asset_path: nvidia-modules-x86_64.tar.gz
+         asset_name: nvidia-modules-x86_64.tar.gz
+         asset_content_type: application/gzip
      - name: Upload Image.gz for aarch64
        uses: actions/upload-release-asset@v1
        env:

arch/arm64/configs/ch_defconfig

@@ -794,7 +794,10 @@ CONFIG_FUNCTION_ALIGNMENT=4
 # end of General architecture-dependent options
 
 CONFIG_RT_MUTEXES=y
-# CONFIG_MODULES is not set
+CONFIG_MODULES=y
+CONFIG_MODULE_UNLOAD=y
+CONFIG_MODVERSIONS=y
+CONFIG_MODULE_SRCVERSION_ALL=y
 CONFIG_BLOCK=y
 CONFIG_BLOCK_LEGACY_AUTOLOAD=y
 CONFIG_BLK_CGROUP_RWSTAT=y
@@ -2002,7 +2005,8 @@ CONFIG_BCMA_POSSIBLE=y
 #
 CONFIG_VIDEO=y
 # CONFIG_AUXDISPLAY is not set
-# CONFIG_DRM is not set
+CONFIG_DRM=y
+CONFIG_DRM_FBDEV_EMULATION=y
 
 #
 # Frame buffer Devices

arch/riscv/configs/ch_defconfig

@@ -655,7 +655,10 @@ CONFIG_FUNCTION_ALIGNMENT=0
 # end of General architecture-dependent options
 
 CONFIG_RT_MUTEXES=y
-# CONFIG_MODULES is not set
+CONFIG_MODULES=y
+CONFIG_MODULE_UNLOAD=y
+CONFIG_MODVERSIONS=y
+CONFIG_MODULE_SRCVERSION_ALL=y
 CONFIG_BLOCK=y
 CONFIG_BLOCK_LEGACY_AUTOLOAD=y
 CONFIG_BLK_CGROUP_RWSTAT=y
@@ -1769,7 +1772,8 @@ CONFIG_BCMA_POSSIBLE=y
 #
 CONFIG_VIDEO=y
 # CONFIG_AUXDISPLAY is not set
-# CONFIG_DRM is not set
+CONFIG_DRM=y
+CONFIG_DRM_FBDEV_EMULATION=y
 
 #
 # Frame buffer Devices

arch/x86/configs/ch_defconfig

@@ -857,7 +857,10 @@ CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT=y
 # end of General architecture-dependent options
 
 CONFIG_RT_MUTEXES=y
-# CONFIG_MODULES is not set
+CONFIG_MODULES=y
+CONFIG_MODULE_UNLOAD=y
+CONFIG_MODVERSIONS=y
+CONFIG_MODULE_SRCVERSION_ALL=y
 CONFIG_BLOCK=y
 CONFIG_BLOCK_LEGACY_AUTOLOAD=y
 CONFIG_BLK_CGROUP_RWSTAT=y
@@ -2024,7 +2027,8 @@ CONFIG_VIDEO=y
 # CONFIG_AUXDISPLAY is not set
 # CONFIG_AGP is not set
 # CONFIG_VGA_SWITCHEROO is not set
-# CONFIG_DRM is not set
+CONFIG_DRM=y
+CONFIG_DRM_FBDEV_EMULATION=y
 
 #
 # Frame buffer Devices