Re: [Buildroot] [PATCH] package/mesa3d: add intel-virtio host native context config

Hello Adam,

Thanks for submitting this.

On Fri, Jul 10, 2026 at 6:32 AM Adam Ford <[email protected]> wrote:
>
> Add BR2_PACKAGE_MESA3D_HOST_NATIVE_CONTEXT_DRIVER_INTEL in the same
> pattern as amdgpu-virtio. When enabled, -Dintel-virtio-experimental=true
> defines HAVE_INTEL_VIRTIO so the guest-side Intel native context
> (i915 and xe context types) is compiled in. This is the guest half
> of the Intel vDRM GPU passthrough path, usable by the crocus/iris
> (OpenGL) and ANV (Vulkan) drivers.
>

As I understand, this currently requires the i915 KMD, and does not
support the newer Xe KMD that also supports the Iris/anv UMDs, is that
correct? Perhaps we should note that in the Kconfig help, and remove
mention of Xe context support, to prevent confusion.

It looks like there's some out-of-tree effort to support Xe contexts,
but this is not upstream or pending review as of now. [0]

> Note that this is an experimental Mesa feature (the upstream meson
> option is named intel-virtio-experimental) and is disabled by default.
>
> Signed-off-by: Adam Ford <[email protected]>
>
> diff --git a/package/mesa3d/Config.in b/package/mesa3d/Config.in
> index e184039150..ad02b5e829 100644
> --- a/package/mesa3d/Config.in
> +++ b/package/mesa3d/Config.in
> @@ -130,6 +130,7 @@ config BR2_PACKAGE_MESA3D_GALLIUM_DRIVER_CROCUS
>         bool "Gallium crocus driver"
>         depends on BR2_i386 || BR2_x86_64
>         select BR2_PACKAGE_MESA3D_GALLIUM_DRIVER
> +       select BR2_PACKAGE_MESA3D_HOST_NATIVE_CONTEXT_SUPPORTED_DRIVER
>         help
>           Mesa driver for gen4-7 Intel GPUs.
>
> @@ -167,6 +168,7 @@ config BR2_PACKAGE_MESA3D_GALLIUM_DRIVER_IRIS
>         bool "Gallium iris driver"
>         depends on BR2_PACKAGE_MESA3D_LLVM
>         select BR2_PACKAGE_MESA3D_GALLIUM_DRIVER
> +       select BR2_PACKAGE_MESA3D_HOST_NATIVE_CONTEXT_SUPPORTED_DRIVER
>         select BR2_PACKAGE_MESA3D_NEEDS_PRECOMP_COMPILER
>         select BR2_PACKAGE_MESA3D_RUSTICL_SUPPORTED_DRIVER
>         help
> @@ -393,6 +395,7 @@ config BR2_PACKAGE_MESA3D_VULKAN_DRIVER_INTEL
>         depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17 # memfd.h
>         depends on BR2_TOOLCHAIN_USES_GLIBC # ifunc, static_assert
>         depends on BR2_PACKAGE_MESA3D_LLVM
> +       select BR2_PACKAGE_MESA3D_HOST_NATIVE_CONTEXT_SUPPORTED_DRIVER
>         select BR2_PACKAGE_MESA3D_NEEDS_PRECOMP_COMPILER
>         select BR2_PACKAGE_MESA3D_VULKAN_DRIVER
>         help
> @@ -459,6 +462,22 @@ config BR2_PACKAGE_MESA3D_HOST_NATIVE_CONTEXT_DRIVER_FREEDRENO
>           Select this when running Mesa inside a virtual machine
>           with virtio-gpu host native context support.
>
> +config BR2_PACKAGE_MESA3D_HOST_NATIVE_CONTEXT_DRIVER_INTEL
> +       bool "intel-virtio"
> +       depends on BR2_PACKAGE_MESA3D_GALLIUM_DRIVER_CROCUS || \
> +               BR2_PACKAGE_MESA3D_GALLIUM_DRIVER_IRIS || \
> +               BR2_PACKAGE_MESA3D_VULKAN_DRIVER_INTEL
> +       help
> +         Enable VirtIO support for Intel native contexts
> +         used by the crocus/iris (OpenGL) and ANV (Vulkan)
> +         drivers.
> +
> +         This is an experimental Mesa feature and is disabled
> +         by default.
> +
> +         Select this when running Mesa inside a virtual machine
> +         with virtio-gpu host native context support.
> +
>  config BR2_PACKAGE_MESA3D_HOST_NATIVE_CONTEXT_SUPPORTED_DRIVER
>         bool
>
> diff --git a/package/mesa3d/mesa3d.mk b/package/mesa3d/mesa3d.mk
> index 8e6c2ee5b8..87377b7ce4 100644
> --- a/package/mesa3d/mesa3d.mk
> +++ b/package/mesa3d/mesa3d.mk
> @@ -164,6 +164,12 @@ else
>  MESA3D_CONF_OPTS += -Damdgpu-virtio=false
>  endif
>
> +ifeq ($(BR2_PACKAGE_MESA3D_HOST_NATIVE_CONTEXT_DRIVER_INTEL),y)
> +MESA3D_CONF_OPTS += -Dintel-virtio-experimental=true
> +else
> +MESA3D_CONF_OPTS += -Dintel-virtio-experimental=false
> +endif
> +
>  ifneq ($(BR2_PACKAGE_MESA3D_GALLIUM_DRIVER_FREEDRENO)$(BR2_PACKAGE_MESA3D_VULKAN_DRIVER_FREEDRENO),)
>  MESA3D_FREEDRENO_KMDS = msm
>  ifeq ($(BR2_PACKAGE_MESA3D_HOST_NATIVE_CONTEXT_DRIVER_FREEDRENO),y)
> --
> 2.53.0
>

With the revised help message, you have my

Reviewed-by: Joseph Kogut <[email protected]>

Best
Joseph

[0] https://github.com/cmspam/xe-native-context-enablement
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