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Tsirkin" , Paolo Bonzini , Yiwei Zhang , Sergio Lopez Pascual Cc: Gert Wollny , qemu-devel@nongnu.org, Gurchetan Singh , Alyssa Ross , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Alex Deucher , Stefano Stabellini , =?UTF-8?q?Christian=20K=C3=B6nig?= , Xenia Ragiadakou , Honglei Huang , Julia Zhang , Chen Jiqian , Rob Clark , Robert Beckett Subject: [PATCH v18 11/19] virtio-gpu: Support DRM native context Date: Wed, 18 Feb 2026 00:49:20 +0300 Message-ID: <20260217214928.2970885-12-dmitry.osipenko@collabora.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260217214928.2970885-1-dmitry.osipenko@collabora.com> References: <20260217214928.2970885-1-dmitry.osipenko@collabora.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMailClient: External Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=136.143.188.112; envelope-from=dmitry.osipenko@collabora.com; helo=sender4-pp-f112.zoho.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity dmitry.osipenko@collabora.com) X-ZM-MESSAGEID: 1771365204793158500 Add support for DRM native contexts to VirtIO-GPU. DRM context is enabled using a new virtio-gpu-gl device option "drm_native_context=3Don". Unlike Virgl and Venus contexts that operate on application API level, DRM native contexts work on a kernel UAPI level. This lower level results in a lightweight context implementations that yield better performance. Reviewed-by: Akihiko Odaki Acked-by: Michael S. Tsirkin Tested-by: Alex Benn=C3=A9e Acked-by: Pierre-Eric Pelloux-Prayer Reviewed-by: Yiwei Zhang Tested-by: Yiwei Zhang Signed-off-by: Dmitry Osipenko --- docs/system/devices/virtio/virtio-gpu.rst | 11 +++++++++ hw/display/virtio-gpu-gl.c | 2 ++ hw/display/virtio-gpu-virgl.c | 28 +++++++++++++++++++++++ hw/display/virtio-gpu.c | 15 ++++++++++++ include/hw/virtio/virtio-gpu.h | 3 +++ 5 files changed, 59 insertions(+) diff --git a/docs/system/devices/virtio/virtio-gpu.rst b/docs/system/device= s/virtio/virtio-gpu.rst index 0f4bb304a9b8..086e2fcf27b9 100644 --- a/docs/system/devices/virtio/virtio-gpu.rst +++ b/docs/system/devices/virtio/virtio-gpu.rst @@ -84,6 +84,17 @@ of virtio-gpu host memory window. This is typically betw= een 256M and 8G. =20 .. _venus: https://gitlab.freedesktop.org/virgl/venus-protocol/ =20 +DRM native context is supported since release of `virglrenderer`_ v1.0.0 +using `drm`_ protocol. ``DRM`` virtio-gpu capability set ("capset") requi= res +host blob support (``hostmem`` and ``blob`` fields) and should be enabled +using ``drm_native_context`` field. The ``hostmem`` field specifies the s= ize +of virtio-gpu host memory window. This is typically between 256M and 8G. + +.. parsed-literal:: + -device virtio-gpu-gl,hostmem=3D8G,blob=3Don,drm_native_context=3Don + +.. _drm: https://gitlab.freedesktop.org/virgl/virglrenderer/-/tree/main/sr= c/drm + virtio-gpu rutabaga ------------------- =20 diff --git a/hw/display/virtio-gpu-gl.c b/hw/display/virtio-gpu-gl.c index 3e0680880e14..b941e9a4b789 100644 --- a/hw/display/virtio-gpu-gl.c +++ b/hw/display/virtio-gpu-gl.c @@ -159,6 +159,8 @@ static const Property virtio_gpu_gl_properties[] =3D { VIRTIO_GPU_FLAG_STATS_ENABLED, false), DEFINE_PROP_BIT("venus", VirtIOGPU, parent_obj.conf.flags, VIRTIO_GPU_FLAG_VENUS_ENABLED, false), + DEFINE_PROP_BIT("drm_native_context", VirtIOGPU, parent_obj.conf.flags, + VIRTIO_GPU_FLAG_DRM_ENABLED, false), }; =20 static void virtio_gpu_gl_device_unrealize(DeviceState *qdev) diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c index ea9668f11efe..069408c68644 100644 --- a/hw/display/virtio-gpu-virgl.c +++ b/hw/display/virtio-gpu-virgl.c @@ -1339,6 +1339,25 @@ int virtio_gpu_virgl_init(VirtIOGPU *g) if (virtio_gpu_venus_enabled(g->parent_obj.conf)) { flags |=3D VIRGL_RENDERER_VENUS | VIRGL_RENDERER_RENDER_SERVER; } + if (virtio_gpu_drm_enabled(g->parent_obj.conf)) { + flags |=3D VIRGL_RENDERER_DRM; + + if (!(flags & VIRGL_RENDERER_ASYNC_FENCE_CB)) { + /* + * Virglrenderer skips enabling DRM context support without + * enabled async-fence feature. VirtIO-GPU will initialize + * successfully, but DRM context won't be available in guest. + * + * For vrend async-fencing can be enabled only if EGL display + * is used. Vrend can't be disabled in QEMU, hence DRM implici= tly + * requires EGL too. + * + * Async-fence was bugged in virglrenderer versions <=3D 1.1.1. + */ + error_report("drm requires egl display and virglrenderer >=3D = 1.2.0"); + return -EINVAL; + } + } #endif =20 ret =3D virgl_renderer_init(g, flags, &virtio_gpu_3d_cbs); @@ -1402,5 +1421,14 @@ GArray *virtio_gpu_virgl_get_capsets(VirtIOGPU *g) } } =20 + if (virtio_gpu_drm_enabled(g->parent_obj.conf)) { + virgl_renderer_get_cap_set(VIRTIO_GPU_CAPSET_DRM, + &capset_max_ver, + &capset_max_size); + if (capset_max_size) { + virtio_gpu_virgl_add_capset(capset_ids, VIRTIO_GPU_CAPSET_DRM); + } + } + return capset_ids; } diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c index 643e91ca2a7a..8cd966bea639 100644 --- a/hw/display/virtio-gpu.c +++ b/hw/display/virtio-gpu.c @@ -1517,6 +1517,21 @@ void virtio_gpu_device_realize(DeviceState *qdev, Er= ror **errp) #endif } =20 + if (virtio_gpu_drm_enabled(g->parent_obj.conf)) { +#ifdef VIRGL_VERSION_MAJOR + #if VIRGL_VERSION_MAJOR >=3D 1 + if (!virtio_gpu_blob_enabled(g->parent_obj.conf) || + !virtio_gpu_hostmem_enabled(g->parent_obj.conf)) { + error_setg(errp, "drm requires enabled blob and hostmem option= s"); + return; + } + #else + error_setg(errp, "old virglrenderer, drm unsupported"); + return; + #endif +#endif + } + if (!virtio_gpu_base_device_realize(qdev, virtio_gpu_handle_ctrl_cb, virtio_gpu_handle_cursor_cb, diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h index 16e9f6914f07..718332284305 100644 --- a/include/hw/virtio/virtio-gpu.h +++ b/include/hw/virtio/virtio-gpu.h @@ -100,6 +100,7 @@ enum virtio_gpu_base_conf_flags { VIRTIO_GPU_FLAG_RUTABAGA_ENABLED, VIRTIO_GPU_FLAG_VENUS_ENABLED, VIRTIO_GPU_FLAG_RESOURCE_UUID_ENABLED, + VIRTIO_GPU_FLAG_DRM_ENABLED, }; =20 #define virtio_gpu_virgl_enabled(_cfg) \ @@ -122,6 +123,8 @@ enum virtio_gpu_base_conf_flags { (_cfg.hostmem > 0) #define virtio_gpu_venus_enabled(_cfg) \ (_cfg.flags & (1 << VIRTIO_GPU_FLAG_VENUS_ENABLED)) +#define virtio_gpu_drm_enabled(_cfg) \ + (_cfg.flags & (1 << VIRTIO_GPU_FLAG_DRM_ENABLED)) =20 struct virtio_gpu_base_conf { uint32_t max_outputs; --=20 2.52.0