Re: [PATCH v5 0/5] media: add virtio-media driver
Albert Esteve <[email protected]> Tue, 4 Aug 2026 14:29:25 +0200
| Newsgroups | dev.linux.lists.virtualization,org.kernel.vger.linux-kernel,org.kernel.vger.linux-media |
|---|---|
| Message-ID | <CADSE00L5O+Pc5SXy_Wb6i3xBUu1z+BiDnu4os3tvpYmxd5j-7g@mail.gmail.com> |
Hi Brian, On Thu, Jul 23, 2026 at 8:32=E2=80=AFPM Brian Daniels <briandaniels@google.= com> wrote: > > From: Alexandre Courbot <[email protected]> > > Add the first version of the virtio-media driver. > > This driver acts roughly as a V4L2 relay between user-space and the > virtio virtual device on the host, so it is relatively simple, yet > unconventional. It doesn't use VB2 or other frameworks typically used in > a V4L2 driver, and most of its complexity resides in correctly and > efficiently building the virtio descriptor chain to pass to the host, > avoiding copies whenever possible. This is done by > scatterlist_builder.[ch]. > > This version supports MMAP buffers, while USERPTR buffers can also be > enabled through a driver option. DMABUF support is still pending. > > NOTE: This depends on the VIRTIO ID being added in this patch: > https://lore.kernel.org/all/20260310-virtio-media-id-v1-1-be211bcf682b@re= dhat.com Tested on top of [1], with the rust-vmm backend [2], and QEMU patch adding the pci device [3]. In the guest I have enabled allow_userptr parameter and tested video capture both with mmap and userptr memory types. Both worked perfectly fine. I also tested v4l2-compliance, with results similar to those pasted below. The summary shows: Total for virtio-media device /dev/video0: 56, Succeeded: 54, Failed: 2, Warnings: 0 The additional failed test with respect to the results shown in the cover seems to be `VIDIOC_G/S/TRY_EXT_CTRLS`, where s_ctrl returned error 13. Nevertheless, the results are in line with my expectations, specially with the camera capture tests, so: Tested-by: Albert Esteve <[email protected]> [1] https://lore.kernel.org/all/20260310-virtio-media-id-v1-1-be211bcf682b@= redhat.com [2] https://github.com/rust-vmm/vhost-device/tree/main/vhost-device-media [3] https://lore.kernel.org/all/[email protected]/ BR, Albert. > > Signed-off-by: Alexandre Courbot <[email protected]> > Co-developed-by: Brian Daniels <[email protected]> > Signed-off-by: Brian Daniels <[email protected]> > --- > Guest Setup > > Tests were ran on a Debian 12 guest running with crosvm. The guest image > was created with: > > $ virt-builder debian-12 --root-password password:"" > > Build crosvm and launch the guest starting at the "Crosvm" section on > this page: https://github.com/chromeos/virtio-media/blob/main/TRY_IT_OUT.= md#crosvm > > NOTE: Before running v4l2-compliance in the guest, you need to install > v4l-utils and ffmpeg: > > $ apt update && apt install v4l-utils ffmpeg > > --- > Compliance Testing > > This was tested using v4l2-compliance. Since virtio-media serves as > a proxy to host devices for the guest VMs, we expect the guest > compliance test to essentially match the host compliance test for the > same device. > > NOTE: v4l2-compliance changes its test behavior depending on the driver > name. In the guest, the driver name for virtio-media proxied-devices is > always "virtio-media", even if the actual host device has a driver name > of e.g. "uvcvideo". To ensure the test is consistent between the host > and the guest, I created a patch for the v4l2-compliance tool that > allows you to override the driver name. All test results that follow use > this patch: > https://lore.kernel.org/r/[email protected]= m/ > > All tests used a Logitech USB Webcam C925e. > > As tested on the host: > > $ v4l2-compliance -d1 -s > > v4l2-compliance 1.33.0-5471, 64 bits, 64-bit time_t > v4l2-compliance SHA: 9f2d3ea879ff 2026-05-28 14:45:11 > > Compliance test for uvcvideo device /dev/video1: > > Driver Info: > Driver name : uvcvideo > Card type : Logitech Webcam C925e > Bus info : usb-0000:04:00.1-3 > Driver version : 6.18.14 > Capabilities : 0x84a00001 > Video Capture > Metadata Capture > Streaming > Extended Pix Format > Device Capabilities > Device Caps : 0x04200001 > Video Capture > Streaming > Extended Pix Format > Media Driver Info: > Driver name : uvcvideo > Model : Logitech Webcam C925e > Serial : 686F371F > Bus info : usb-0000:04:00.1-3 > Media version : 6.18.14 > Hardware revision: 0x00000016 (22) > Driver version : 6.18.14 > Interface Info: > ID : 0x03000002 > Type : V4L Video > Entity Info: > ID : 0x00000001 (1) > Name : Logitech Webcam C925e > Function : V4L2 I/O > Flags : default > Pad 0x01000007 : 0: Sink > Link 0x0200001f: from remote pad 0x100000a of entity 'Processin= g 3' (Video Pixel Formatter): Data, Enabled, Immutable > > Required ioctls: > test MC information (see 'Media Driver Info' above): OK > test VIDIOC_QUERYCAP: OK > test invalid ioctls: OK > > Allow for multiple opens: > test second /dev/video1 open: OK > test VIDIOC_QUERYCAP: OK > test VIDIOC_G/S_PRIORITY: OK > test for unlimited opens: OK > > Debug ioctls: > test VIDIOC_DBG_G/S_REGISTER: OK (Not Supported) > test VIDIOC_LOG_STATUS: OK (Not Supported) > > Input ioctls: > test VIDIOC_G/S_TUNER/ENUM_FREQ_BANDS: OK (Not Supported) > test VIDIOC_G/S_FREQUENCY: OK (Not Supported) > test VIDIOC_S_HW_FREQ_SEEK: OK (Not Supported) > test VIDIOC_ENUMAUDIO: OK (Not Supported) > test VIDIOC_G/S/ENUMINPUT: OK > test VIDIOC_G/S_AUDIO: OK (Not Supported) > Inputs: 1 Audio Inputs: 0 Tuners: 0 > > Output ioctls: > test VIDIOC_G/S_MODULATOR: OK (Not Supported) > test VIDIOC_G/S_FREQUENCY: OK (Not Supported) > test VIDIOC_ENUMAUDOUT: OK (Not Supported) > test VIDIOC_G/S/ENUMOUTPUT: OK (Not Supported) > test VIDIOC_G/S_AUDOUT: OK (Not Supported) > Outputs: 0 Audio Outputs: 0 Modulators: 0 > > Input/Output configuration ioctls: > test VIDIOC_ENUM/G/S/QUERY_STD: OK (Not Supported) > test VIDIOC_ENUM/G/S/QUERY_DV_TIMINGS: OK (Not Supported) > test VIDIOC_DV_TIMINGS_CAP: OK (Not Supported) > test VIDIOC_G/S_EDID: OK (Not Supported) > > Control ioctls (Input 0): > test VIDIOC_QUERY_EXT_CTRL/QUERYMENU: OK > test VIDIOC_QUERYCTRL: OK > test VIDIOC_G/S_CTRL: OK > fail: v4l2-test-controls.cpp(983): ret !=3D EINVAL (got 1= 3) > test VIDIOC_G/S/TRY_EXT_CTRLS: FAIL > test VIDIOC_(UN)SUBSCRIBE_EVENT/DQEVENT: OK > test VIDIOC_G/S_JPEGCOMP: OK (Not Supported) > Standard Controls: 19 Private Controls: 0 > > Format ioctls (Input 0): > test VIDIOC_ENUM_FMT/FRAMESIZES/FRAMEINTERVALS: OK > test VIDIOC_G/S_PARM: OK > test VIDIOC_G_FBUF: OK (Not Supported) > test VIDIOC_G_FMT: OK > test VIDIOC_TRY_FMT: OK > test VIDIOC_S_FMT: OK > test VIDIOC_G_SLICED_VBI_CAP: OK (Not Supported) > test Cropping: OK (Not Supported) > test Composing: OK (Not Supported) > test Scaling: OK (Not Supported) > > Codec ioctls (Input 0): > test VIDIOC_(TRY_)ENCODER_CMD: OK (Not Supported) > test VIDIOC_G_ENC_INDEX: OK (Not Supported) > test VIDIOC_(TRY_)DECODER_CMD: OK (Not Supported) > > Buffer ioctls (Input 0): > test VIDIOC_REQBUFS/CREATE_BUFS/QUERYBUF: OK > test CREATE_BUFS maximum buffers: OK > test VIDIOC_REMOVE_BUFS: OK > test VIDIOC_EXPBUF: OK > test Requests: OK (Not Supported) > test blocking wait: OK > > Test input 0: > > Streaming ioctls: > test read/write: OK (Not Supported) > > Video Capture: Frame #000 > Video Capture: Frame #001 > Video Capture: Frame #002 > Video Capture: Frame #003 > Video Capture: Frame #004 > Video Capture: Frame #005 > Video Capture: Frame #006 > Video Capture: Frame #007 > Video Capture: Frame #008 > Video Capture: Frame #009 > Video Capture: Frame #010 > Video Capture: Frame #011 > Video Capture: Frame #012 > Video Capture: Frame #013 > Video Capture: Frame #014 > Video Capture: Frame #015 > Video Capture: Frame #016 > Video Capture: Frame #017 > Video Capture: Frame #018 > Video Capture: Frame #019 > Video Capture: Frame #020 > Video Capture: Frame #021 > Video Capture: Frame #022 > Video Capture: Frame #023 > Video Capture: Frame #024 > Video Capture: Frame #025 > Video Capture: Frame #026 > Video Capture: Frame #027 > Video Capture: Frame #028 > Video Capture: Frame #029 > Video Capture: Frame #030 > Video Capture: Frame #031 > Video Capture: Frame #032 > Video Capture: Frame #033 > Video Capture: Frame #034 > Video Capture: Frame #035 > Video Capture: Frame #036 > Video Capture: Frame #037 > Video Capture: Frame #038 > Video Capture: Frame #039 > Video Capture: Frame #040 > Video Capture: Frame #041 > Video Capture: Frame #042 > Video Capture: Frame #043 > Video Capture: Frame #044 > Video Capture: Frame #045 > Video Capture: Frame #046 > Video Capture: Frame #047 > Video Capture: Frame #048 > Video Capture: Frame #049 > Video Capture: Frame #050 > Video Capture: Frame #051 > Video Capture: Frame #052 > Video Capture: Frame #053 > Video Capture: Frame #054 > Video Capture: Frame #055 > Video Capture: Frame #056 > Video Capture: Frame #057 > Video Capture: Frame #058 > Video Capture: Frame #059 > > test MMAP (no poll, REQBUFS): OK > > Video Capture: Frame #000 (select) > Video Capture: Frame #001 (select) > Video Capture: Frame #002 (select) > Video Capture: Frame #003 (select) > Video Capture: Frame #004 (select) > Video Capture: Frame #005 (select) > Video Capture: Frame #006 (select) > Video Capture: Frame #007 (select) > Video Capture: Frame #008 (select) > Video Capture: Frame #009 (select) > Video Capture: Frame #010 (select) > Video Capture: Frame #011 (select) > Video Capture: Frame #012 (select) > Video Capture: Frame #013 (select) > Video Capture: Frame #014 (select) > Video Capture: Frame #015 (select) > Video Capture: Frame #016 (select) > Video Capture: Frame #017 (select) > Video Capture: Frame #018 (select) > Video Capture: Frame #019 (select) > Video Capture: Frame #020 (select) > Video Capture: Frame #021 (select) > Video Capture: Frame #022 (select) > Video Capture: Frame #023 (select) > Video Capture: Frame #024 (select) > Video Capture: Frame #025 (select) > Video Capture: Frame #026 (select) > Video Capture: Frame #027 (select) > Video Capture: Frame #028 (select) > Video Capture: Frame #029 (select) > Video Capture: Frame #030 (select) > Video Capture: Frame #031 (select) > Video Capture: Frame #032 (select) > Video Capture: Frame #033 (select) > Video Capture: Frame #034 (select) > Video Capture: Frame #035 (select) > Video Capture: Frame #036 (select) > Video Capture: Frame #037 (select) > Video Capture: Frame #038 (select) > Video Capture: Frame #039 (select) > Video Capture: Frame #040 (select) > Video Capture: Frame #041 (select) > Video Capture: Frame #042 (select) > Video Capture: Frame #043 (select) > Video Capture: Frame #044 (select) > Video Capture: Frame #045 (select) > Video Capture: Frame #046 (select) > Video Capture: Frame #047 (select) > Video Capture: Frame #048 (select) > Video Capture: Frame #049 (select) > Video Capture: Frame #050 (select) > Video Capture: Frame #051 (select) > Video Capture: Frame #052 (select) > Video Capture: Frame #053 (select) > Video Capture: Frame #054 (select) > Video Capture: Frame #055 (select) > Video Capture: Frame #056 (select) > Video Capture: Frame #057 (select) > Video Capture: Frame #058 (select) > Video Capture: Frame #059 (select) > > test MMAP (select, REQBUFS): OK > > Video Capture: Frame #000 (epoll) > Video Capture: Frame #001 (epoll) > Video Capture: Frame #002 (epoll) > Video Capture: Frame #003 (epoll) > Video Capture: Frame #004 (epoll) > Video Capture: Frame #005 (epoll) > Video Capture: Frame #006 (epoll) > Video Capture: Frame #007 (epoll) > Video Capture: Frame #008 (epoll) > Video Capture: Frame #009 (epoll) > Video Capture: Frame #010 (epoll) > Video Capture: Frame #011 (epoll) > Video Capture: Frame #012 (epoll) > Video Capture: Frame #013 (epoll) > Video Capture: Frame #014 (epoll) > Video Capture: Frame #015 (epoll) > Video Capture: Frame #016 (epoll) > Video Capture: Frame #017 (epoll) > Video Capture: Frame #018 (epoll) > Video Capture: Frame #019 (epoll) > Video Capture: Frame #020 (epoll) > Video Capture: Frame #021 (epoll) > Video Capture: Frame #022 (epoll) > Video Capture: Frame #023 (epoll) > Video Capture: Frame #024 (epoll) > Video Capture: Frame #025 (epoll) > Video Capture: Frame #026 (epoll) > Video Capture: Frame #027 (epoll) > Video Capture: Frame #028 (epoll) > Video Capture: Frame #029 (epoll) > Video Capture: Frame #030 (epoll) > Video Capture: Frame #031 (epoll) > Video Capture: Frame #032 (epoll) > Video Capture: Frame #033 (epoll) > Video Capture: Frame #034 (epoll) > Video Capture: Frame #035 (epoll) > Video Capture: Frame #036 (epoll) > Video Capture: Frame #037 (epoll) > Video Capture: Frame #038 (epoll) > Video Capture: Frame #039 (epoll) > Video Capture: Frame #040 (epoll) > Video Capture: Frame #041 (epoll) > Video Capture: Frame #042 (epoll) > Video Capture: Frame #043 (epoll) > Video Capture: Frame #044 (epoll) > Video Capture: Frame #045 (epoll) > Video Capture: Frame #046 (epoll) > Video Capture: Frame #047 (epoll) > Video Capture: Frame #048 (epoll) > Video Capture: Frame #049 (epoll) > Video Capture: Frame #050 (epoll) > Video Capture: Frame #051 (epoll) > Video Capture: Frame #052 (epoll) > Video Capture: Frame #053 (epoll) > Video Capture: Frame #054 (epoll) > Video Capture: Frame #055 (epoll) > Video Capture: Frame #056 (epoll) > Video Capture: Frame #057 (epoll) > Video Capture: Frame #058 (epoll) > Video Capture: Frame #059 (epoll) > > test MMAP (epoll, REQBUFS): OK > > Video Capture: Frame #000 > Video Capture: Frame #001 > Video Capture: Frame #002 > Video Capture: Frame #003 > Video Capture: Frame #004 > Video Capture: Frame #005 > Video Capture: Frame #006 > Video Capture: Frame #007 > Video Capture: Frame #008 > Video Capture: Frame #009 > Video Capture: Frame #010 > Video Capture: Frame #011 > Video Capture: Frame #012 > Video Capture: Frame #013 > Video Capture: Frame #014 > Video Capture: Frame #015 > Video Capture: Frame #016 > Video Capture: Frame #017 > Video Capture: Frame #018 > Video Capture: Frame #019 > Video Capture: Frame #020 > Video Capture: Frame #021 > Video Capture: Frame #022 > Video Capture: Frame #023 > Video Capture: Frame #024 > Video Capture: Frame #025 > Video Capture: Frame #026 > Video Capture: Frame #027 > Video Capture: Frame #028 > Video Capture: Frame #029 > Video Capture: Frame #030 > Video Capture: Frame #031 > Video Capture: Frame #032 > Video Capture: Frame #033 > Video Capture: Frame #034 > Video Capture: Frame #035 > Video Capture: Frame #036 > Video Capture: Frame #037 > Video Capture: Frame #038 > Video Capture: Frame #039 > Video Capture: Frame #040 > Video Capture: Frame #041 > Video Capture: Frame #042 > Video Capture: Frame #043 > Video Capture: Frame #044 > Video Capture: Frame #045 > Video Capture: Frame #046 > Video Capture: Frame #047 > Video Capture: Frame #048 > Video Capture: Frame #049 > Video Capture: Frame #050 > Video Capture: Frame #051 > Video Capture: Frame #052 > Video Capture: Frame #053 > Video Capture: Frame #054 > Video Capture: Frame #055 > Video Capture: Frame #056 > Video Capture: Frame #057 > Video Capture: Frame #058 > Video Capture: Frame #059 > > test MMAP (no poll, CREATE_BUFS): OK > > Video Capture: Frame #000 (select) > Video Capture: Frame #001 (select) > Video Capture: Frame #002 (select) > Video Capture: Frame #003 (select) > Video Capture: Frame #004 (select) > Video Capture: Frame #005 (select) > Video Capture: Frame #006 (select) > Video Capture: Frame #007 (select) > Video Capture: Frame #008 (select) > Video Capture: Frame #009 (select) > Video Capture: Frame #010 (select) > Video Capture: Frame #011 (select) > Video Capture: Frame #012 (select) > Video Capture: Frame #013 (select) > Video Capture: Frame #014 (select) > Video Capture: Frame #015 (select) > Video Capture: Frame #016 (select) > Video Capture: Frame #017 (select) > Video Capture: Frame #018 (select) > Video Capture: Frame #019 (select) > Video Capture: Frame #020 (select) > Video Capture: Frame #021 (select) > Video Capture: Frame #022 (select) > Video Capture: Frame #023 (select) > Video Capture: Frame #024 (select) > Video Capture: Frame #025 (select) > Video Capture: Frame #026 (select) > Video Capture: Frame #027 (select) > Video Capture: Frame #028 (select) > Video Capture: Frame #029 (select) > Video Capture: Frame #030 (select) > Video Capture: Frame #031 (select) > Video Capture: Frame #032 (select) > Video Capture: Frame #033 (select) > Video Capture: Frame #034 (select) > Video Capture: Frame #035 (select) > Video Capture: Frame #036 (select) > Video Capture: Frame #037 (select) > Video Capture: Frame #038 (select) > Video Capture: Frame #039 (select) > Video Capture: Frame #040 (select) > Video Capture: Frame #041 (select) > Video Capture: Frame #042 (select) > Video Capture: Frame #043 (select) > Video Capture: Frame #044 (select) > Video Capture: Frame #045 (select) > Video Capture: Frame #046 (select) > Video Capture: Frame #047 (select) > Video Capture: Frame #048 (select) > Video Capture: Frame #049 (select) > Video Capture: Frame #050 (select) > Video Capture: Frame #051 (select) > Video Capture: Frame #052 (select) > Video Capture: Frame #053 (select) > Video Capture: Frame #054 (select) > Video Capture: Frame #055 (select) > Video Capture: Frame #056 (select) > Video Capture: Frame #057 (select) > Video Capture: Frame #058 (select) > Video Capture: Frame #059 (select) > > test MMAP (select, CREATE_BUFS): OK > > Video Capture: Frame #000 (epoll) > Video Capture: Frame #001 (epoll) > Video Capture: Frame #002 (epoll) > Video Capture: Frame #003 (epoll) > Video Capture: Frame #004 (epoll) > Video Capture: Frame #005 (epoll) > Video Capture: Frame #006 (epoll) > Video Capture: Frame #007 (epoll) > Video Capture: Frame #008 (epoll) > Video Capture: Frame #009 (epoll) > Video Capture: Frame #010 (epoll) > Video Capture: Frame #011 (epoll) > Video Capture: Frame #012 (epoll) > Video Capture: Frame #013 (epoll) > Video Capture: Frame #014 (epoll) > Video Capture: Frame #015 (epoll) > Video Capture: Frame #016 (epoll) > Video Capture: Frame #017 (epoll) > Video Capture: Frame #018 (epoll) > Video Capture: Frame #019 (epoll) > Video Capture: Frame #020 (epoll) > Video Capture: Frame #021 (epoll) > Video Capture: Frame #022 (epoll) > Video Capture: Frame #023 (epoll) > Video Capture: Frame #024 (epoll) > Video Capture: Frame #025 (epoll) > Video Capture: Frame #026 (epoll) > Video Capture: Frame #027 (epoll) > Video Capture: Frame #028 (epoll) > Video Capture: Frame #029 (epoll) > Video Capture: Frame #030 (epoll) > Video Capture: Frame #031 (epoll) > Video Capture: Frame #032 (epoll) > Video Capture: Frame #033 (epoll) > Video Capture: Frame #034 (epoll) > Video Capture: Frame #035 (epoll) > Video Capture: Frame #036 (epoll) > Video Capture: Frame #037 (epoll) > Video Capture: Frame #038 (epoll) > Video Capture: Frame #039 (epoll) > Video Capture: Frame #040 (epoll) > Video Capture: Frame #041 (epoll) > Video Capture: Frame #042 (epoll) > Video Capture: Frame #043 (epoll) > Video Capture: Frame #044 (epoll) > Video Capture: Frame #045 (epoll) > Video Capture: Frame #046 (epoll) > Video Capture: Frame #047 (epoll) > Video Capture: Frame #048 (epoll) > Video Capture: Frame #049 (epoll) > Video Capture: Frame #050 (epoll) > Video Capture: Frame #051 (epoll) > Video Capture: Frame #052 (epoll) > Video Capture: Frame #053 (epoll) > Video Capture: Frame #054 (epoll) > Video Capture: Frame #055 (epoll) > Video Capture: Frame #056 (epoll) > Video Capture: Frame #057 (epoll) > Video Capture: Frame #058 (epoll) > Video Capture: Frame #059 (epoll) > > test MMAP (epoll, CREATE_BUFS): OK > > Video Capture: Frame #000 > Video Capture: Frame #001 > Video Capture: Frame #002 > Video Capture: Frame #003 > Video Capture: Frame #004 > Video Capture: Frame #005 > Video Capture: Frame #006 > Video Capture: Frame #007 > Video Capture: Frame #008 > Video Capture: Frame #009 > Video Capture: Frame #010 > Video Capture: Frame #011 > Video Capture: Frame #012 > Video Capture: Frame #013 > Video Capture: Frame #014 > Video Capture: Frame #015 > Video Capture: Frame #016 > Video Capture: Frame #017 > Video Capture: Frame #018 > Video Capture: Frame #019 > Video Capture: Frame #020 > Video Capture: Frame #021 > Video Capture: Frame #022 > Video Capture: Frame #023 > Video Capture: Frame #024 > Video Capture: Frame #025 > Video Capture: Frame #026 > Video Capture: Frame #027 > Video Capture: Frame #028 > Video Capture: Frame #029 > Video Capture: Frame #030 > Video Capture: Frame #031 > Video Capture: Frame #032 > Video Capture: Frame #033 > Video Capture: Frame #034 > Video Capture: Frame #035 > Video Capture: Frame #036 > Video Capture: Frame #037 > Video Capture: Frame #038 > Video Capture: Frame #039 > Video Capture: Frame #040 > Video Capture: Frame #041 > Video Capture: Frame #042 > Video Capture: Frame #043 > Video Capture: Frame #044 > Video Capture: Frame #045 > Video Capture: Frame #046 > Video Capture: Frame #047 > Video Capture: Frame #048 > Video Capture: Frame #049 > Video Capture: Frame #050 > Video Capture: Frame #051 > Video Capture: Frame #052 > Video Capture: Frame #053 > Video Capture: Frame #054 > Video Capture: Frame #055 > Video Capture: Frame #056 > Video Capture: Frame #057 > Video Capture: Frame #058 > Video Capture: Frame #059 > > test USERPTR (no poll): OK > > Video Capture: Frame #000 (select) > Video Capture: Frame #001 (select) > Video Capture: Frame #002 (select) > Video Capture: Frame #003 (select) > Video Capture: Frame #004 (select) > Video Capture: Frame #005 (select) > Video Capture: Frame #006 (select) > Video Capture: Frame #007 (select) > Video Capture: Frame #008 (select) > Video Capture: Frame #009 (select) > Video Capture: Frame #010 (select) > Video Capture: Frame #011 (select) > Video Capture: Frame #012 (select) > Video Capture: Frame #013 (select) > Video Capture: Frame #014 (select) > Video Capture: Frame #015 (select) > Video Capture: Frame #016 (select) > Video Capture: Frame #017 (select) > Video Capture: Frame #018 (select) > Video Capture: Frame #019 (select) > Video Capture: Frame #020 (select) > Video Capture: Frame #021 (select) > Video Capture: Frame #022 (select) > Video Capture: Frame #023 (select) > Video Capture: Frame #024 (select) > Video Capture: Frame #025 (select) > Video Capture: Frame #026 (select) > Video Capture: Frame #027 (select) > Video Capture: Frame #028 (select) > Video Capture: Frame #029 (select) > Video Capture: Frame #030 (select) > Video Capture: Frame #031 (select) > Video Capture: Frame #032 (select) > Video Capture: Frame #033 (select) > Video Capture: Frame #034 (select) > Video Capture: Frame #035 (select) > Video Capture: Frame #036 (select) > Video Capture: Frame #037 (select) > Video Capture: Frame #038 (select) > Video Capture: Frame #039 (select) > Video Capture: Frame #040 (select) > Video Capture: Frame #041 (select) > Video Capture: Frame #042 (select) > Video Capture: Frame #043 (select) > Video Capture: Frame #044 (select) > Video Capture: Frame #045 (select) > Video Capture: Frame #046 (select) > Video Capture: Frame #047 (select) > Video Capture: Frame #048 (select) > Video Capture: Frame #049 (select) > Video Capture: Frame #050 (select) > Video Capture: Frame #051 (select) > Video Capture: Frame #052 (select) > Video Capture: Frame #053 (select) > Video Capture: Frame #054 (select) > Video Capture: Frame #055 (select) > Video Capture: Frame #056 (select) > Video Capture: Frame #057 (select) > Video Capture: Frame #058 (select) > Video Capture: Frame #059 (select) > > test USERPTR (select): OK > test DMABUF: Cannot test, specify --expbuf-device > > Total for uvcvideo device /dev/video1: 58, Succeeded: 57, Failed: 1, Warn= ings: 0 > > As tested on the guest: > > $ v4l2-compliance -d0 -s --driver-name uvcvideo > > v4l2-compliance 1.33.0-5457, 64 bits, 64-bit time_t > v4l2-compliance SHA: e7e240f546f3 2026-05-28 17:06:12 > > Compliance test for uvcvideo device (overridden from virtio-media) /dev/v= ideo0: > > Driver Info: > Driver name : uvcvideo > Card type : Logitech Webcam C925e > Bus info : platform:virtio-media > Driver version : 7.1.0 > Capabilities : 0x84200001 > Video Capture > Streaming > Extended Pix Format > Device Capabilities > Device Caps : 0x04200001 > Video Capture > Streaming > Extended Pix Format > > Required ioctls: > test VIDIOC_QUERYCAP: OK > test invalid ioctls: OK > > Allow for multiple opens: > test second /dev/video0 open: OK > test VIDIOC_QUERYCAP: OK > test VIDIOC_G/S_PRIORITY: OK > test for unlimited opens: OK > > Debug ioctls: > test VIDIOC_DBG_G/S_REGISTER: OK (Not Supported) > test VIDIOC_LOG_STATUS: OK (Not Supported) > > Input ioctls: > test VIDIOC_G/S_TUNER/ENUM_FREQ_BANDS: OK (Not Supported) > test VIDIOC_G/S_FREQUENCY: OK (Not Supported) > test VIDIOC_S_HW_FREQ_SEEK: OK > test VIDIOC_ENUMAUDIO: OK (Not Supported) > test VIDIOC_G/S/ENUMINPUT: OK > test VIDIOC_G/S_AUDIO: OK (Not Supported) > Inputs: 1 Audio Inputs: 0 Tuners: 0 > > Output ioctls: > test VIDIOC_G/S_MODULATOR: OK (Not Supported) > test VIDIOC_G/S_FREQUENCY: OK (Not Supported) > test VIDIOC_ENUMAUDOUT: OK (Not Supported) > test VIDIOC_G/S/ENUMOUTPUT: OK (Not Supported) > test VIDIOC_G/S_AUDOUT: OK (Not Supported) > Outputs: 0 Audio Outputs: 0 Modulators: 0 > > Input/Output configuration ioctls: > test VIDIOC_ENUM/G/S/QUERY_STD: OK (Not Supported) > test VIDIOC_ENUM/G/S/QUERY_DV_TIMINGS: OK (Not Supported) > test VIDIOC_DV_TIMINGS_CAP: OK (Not Supported) > test VIDIOC_G/S_EDID: OK (Not Supported) > > Control ioctls (Input 0): > test VIDIOC_QUERY_EXT_CTRL/QUERYMENU: OK > test VIDIOC_QUERYCTRL: OK > test VIDIOC_G/S_CTRL: OK > fail: v4l2-test-controls.cpp(981): ret (got 22) > test VIDIOC_G/S/TRY_EXT_CTRLS: FAIL > test VIDIOC_(UN)SUBSCRIBE_EVENT/DQEVENT: OK > test VIDIOC_G/S_JPEGCOMP: OK (Not Supported) > Standard Controls: 19 Private Controls: 0 > > Format ioctls (Input 0): > test VIDIOC_ENUM_FMT/FRAMESIZES/FRAMEINTERVALS: OK > test VIDIOC_G/S_PARM: OK > test VIDIOC_G_FBUF: OK (Not Supported) > test VIDIOC_G_FMT: OK > test VIDIOC_TRY_FMT: OK > test VIDIOC_S_FMT: OK > test VIDIOC_G_SLICED_VBI_CAP: OK (Not Supported) > test Cropping: OK (Not Supported) > test Composing: OK (Not Supported) > test Scaling: OK (Not Supported) > > Codec ioctls (Input 0): > test VIDIOC_(TRY_)ENCODER_CMD: OK (Not Supported) > test VIDIOC_G_ENC_INDEX: OK (Not Supported) > test VIDIOC_(TRY_)DECODER_CMD: OK (Not Supported) > > Buffer ioctls (Input 0): > test VIDIOC_REQBUFS/CREATE_BUFS/QUERYBUF: OK > test CREATE_BUFS maximum buffers: OK > test VIDIOC_REMOVE_BUFS: OK > test VIDIOC_EXPBUF: OK (Not Supported) > test Requests: OK (Not Supported) > test blocking wait: OK > > Test input 0: > > Streaming ioctls: > test read/write: OK (Not Supported) > > Video Capture: Frame #000 > Video Capture: Frame #001 > Video Capture: Frame #002 > Video Capture: Frame #003 > Video Capture: Frame #004 > Video Capture: Frame #005 > Video Capture: Frame #006 > Video Capture: Frame #007 > Video Capture: Frame #008 > Video Capture: Frame #009 > Video Capture: Frame #010 > Video Capture: Frame #011 > Video Capture: Frame #012 > Video Capture: Frame #013 > Video Capture: Frame #014 > Video Capture: Frame #015 > Video Capture: Frame #016 > Video Capture: Frame #017 > Video Capture: Frame #018 > Video Capture: Frame #019 > Video Capture: Frame #020 > Video Capture: Frame #021 > Video Capture: Frame #022 > Video Capture: Frame #023 > Video Capture: Frame #024 > Video Capture: Frame #025 > Video Capture: Frame #026 > Video Capture: Frame #027 > Video Capture: Frame #028 > Video Capture: Frame #029 > Video Capture: Frame #030 > Video Capture: Frame #031 > Video Capture: Frame #032 > Video Capture: Frame #033 > Video Capture: Frame #034 > Video Capture: Frame #035 > Video Capture: Frame #036 > Video Capture: Frame #037 > Video Capture: Frame #038 > Video Capture: Frame #039 > Video Capture: Frame #040 > Video Capture: Frame #041 > Video Capture: Frame #042 > Video Capture: Frame #043 > Video Capture: Frame #044 > Video Capture: Frame #045 > Video Capture: Frame #046 > Video Capture: Frame #047 > Video Capture: Frame #048 > Video Capture: Frame #049 > Video Capture: Frame #050 > Video Capture: Frame #051 > Video Capture: Frame #052 > Video Capture: Frame #053 > Video Capture: Frame #054 > Video Capture: Frame #055 > Video Capture: Frame #056 > Video Capture: Frame #057 > Video Capture: Frame #058 > Video Capture: Frame #059 > > test MMAP (no poll, REQBUFS): OK > > Video Capture: Frame #000 (select) > Video Capture: Frame #001 (select) > Video Capture: Frame #002 (select) > Video Capture: Frame #003 (select) > Video Capture: Frame #004 (select) > Video Capture: Frame #005 (select) > Video Capture: Frame #006 (select) > Video Capture: Frame #007 (select) > Video Capture: Frame #008 (select) > Video Capture: Frame #009 (select) > Video Capture: Frame #010 (select) > Video Capture: Frame #011 (select) > Video Capture: Frame #012 (select) > Video Capture: Frame #013 (select) > Video Capture: Frame #014 (select) > Video Capture: Frame #015 (select) > Video Capture: Frame #016 (select) > Video Capture: Frame #017 (select) > Video Capture: Frame #018 (select) > Video Capture: Frame #019 (select) > Video Capture: Frame #020 (select) > Video Capture: Frame #021 (select) > Video Capture: Frame #022 (select) > Video Capture: Frame #023 (select) > Video Capture: Frame #024 (select) > Video Capture: Frame #025 (select) > Video Capture: Frame #026 (select) > Video Capture: Frame #027 (select) > Video Capture: Frame #028 (select) > Video Capture: Frame #029 (select) > Video Capture: Frame #030 (select) > Video Capture: Frame #031 (select) > Video Capture: Frame #032 (select) > Video Capture: Frame #033 (select) > Video Capture: Frame #034 (select) > Video Capture: Frame #035 (select) > Video Capture: Frame #036 (select) > Video Capture: Frame #037 (select) > Video Capture: Frame #038 (select) > Video Capture: Frame #039 (select) > Video Capture: Frame #040 (select) > Video Capture: Frame #041 (select) > Video Capture: Frame #042 (select) > Video Capture: Frame #043 (select) > Video Capture: Frame #044 (select) > Video Capture: Frame #045 (select) > Video Capture: Frame #046 (select) > Video Capture: Frame #047 (select) > Video Capture: Frame #048 (select) > Video Capture: Frame #049 (select) > Video Capture: Frame #050 (select) > Video Capture: Frame #051 (select) > Video Capture: Frame #052 (select) > Video Capture: Frame #053 (select) > Video Capture: Frame #054 (select) > Video Capture: Frame #055 (select) > Video Capture: Frame #056 (select) > Video Capture: Frame #057 (select) > Video Capture: Frame #058 (select) > Video Capture: Frame #059 (select) > > test MMAP (select, REQBUFS): OK > > Video Capture: Frame #000 (epoll) > Video Capture: Frame #001 (epoll) > Video Capture: Frame #002 (epoll) > Video Capture: Frame #003 (epoll) > Video Capture: Frame #004 (epoll) > Video Capture: Frame #005 (epoll) > Video Capture: Frame #006 (epoll) > Video Capture: Frame #007 (epoll) > Video Capture: Frame #008 (epoll) > Video Capture: Frame #009 (epoll) > Video Capture: Frame #010 (epoll) > Video Capture: Frame #011 (epoll) > Video Capture: Frame #012 (epoll) > Video Capture: Frame #013 (epoll) > Video Capture: Frame #014 (epoll) > Video Capture: Frame #015 (epoll) > Video Capture: Frame #016 (epoll) > Video Capture: Frame #017 (epoll) > Video Capture: Frame #018 (epoll) > Video Capture: Frame #019 (epoll) > Video Capture: Frame #020 (epoll) > Video Capture: Frame #021 (epoll) > Video Capture: Frame #022 (epoll) > Video Capture: Frame #023 (epoll) > Video Capture: Frame #024 (epoll) > Video Capture: Frame #025 (epoll) > Video Capture: Frame #026 (epoll) > Video Capture: Frame #027 (epoll) > Video Capture: Frame #028 (epoll) > Video Capture: Frame #029 (epoll) > Video Capture: Frame #030 (epoll) > Video Capture: Frame #031 (epoll) > Video Capture: Frame #032 (epoll) > Video Capture: Frame #033 (epoll) > Video Capture: Frame #034 (epoll) > Video Capture: Frame #035 (epoll) > Video Capture: Frame #036 (epoll) > Video Capture: Frame #037 (epoll) > Video Capture: Frame #038 (epoll) > Video Capture: Frame #039 (epoll) > Video Capture: Frame #040 (epoll) > Video Capture: Frame #041 (epoll) > Video Capture: Frame #042 (epoll) > Video Capture: Frame #043 (epoll) > Video Capture: Frame #044 (epoll) > Video Capture: Frame #045 (epoll) > Video Capture: Frame #046 (epoll) > Video Capture: Frame #047 (epoll) > Video Capture: Frame #048 (epoll) > Video Capture: Frame #049 (epoll) > Video Capture: Frame #050 (epoll) > Video Capture: Frame #051 (epoll) > Video Capture: Frame #052 (epoll) > Video Capture: Frame #053 (epoll) > Video Capture: Frame #054 (epoll) > Video Capture: Frame #055 (epoll) > Video Capture: Frame #056 (epoll) > Video Capture: Frame #057 (epoll) > Video Capture: Frame #058 (epoll) > Video Capture: Frame #059 (epoll) > > test MMAP (epoll, REQBUFS): OK > > Video Capture: Frame #000 > Video Capture: Frame #001 > Video Capture: Frame #002 > Video Capture: Frame #003 > Video Capture: Frame #004 > Video Capture: Frame #005 > Video Capture: Frame #006 > Video Capture: Frame #007 > Video Capture: Frame #008 > Video Capture: Frame #009 > Video Capture: Frame #010 > Video Capture: Frame #011 > Video Capture: Frame #012 > Video Capture: Frame #013 > Video Capture: Frame #014 > Video Capture: Frame #015 > Video Capture: Frame #016 > Video Capture: Frame #017 > Video Capture: Frame #018 > Video Capture: Frame #019 > Video Capture: Frame #020 > Video Capture: Frame #021 > Video Capture: Frame #022 > Video Capture: Frame #023 > Video Capture: Frame #024 > Video Capture: Frame #025 > Video Capture: Frame #026 > Video Capture: Frame #027 > Video Capture: Frame #028 > Video Capture: Frame #029 > Video Capture: Frame #030 > Video Capture: Frame #031 > Video Capture: Frame #032 > Video Capture: Frame #033 > Video Capture: Frame #034 > Video Capture: Frame #035 > Video Capture: Frame #036 > Video Capture: Frame #037 > Video Capture: Frame #038 > Video Capture: Frame #039 > Video Capture: Frame #040 > Video Capture: Frame #041 > Video Capture: Frame #042 > Video Capture: Frame #043 > Video Capture: Frame #044 > Video Capture: Frame #045 > Video Capture: Frame #046 > Video Capture: Frame #047 > Video Capture: Frame #048 > Video Capture: Frame #049 > Video Capture: Frame #050 > Video Capture: Frame #051 > Video Capture: Frame #052 > Video Capture: Frame #053 > Video Capture: Frame #054 > Video Capture: Frame #055 > Video Capture: Frame #056 > Video Capture: Frame #057 > Video Capture: Frame #058 > Video Capture: Frame #059 > > test MMAP (no poll, CREATE_BUFS): OK > > Video Capture: Frame #000 (select) > Video Capture: Frame #001 (select) > Video Capture: Frame #002 (select) > Video Capture: Frame #003 (select) > Video Capture: Frame #004 (select) > Video Capture: Frame #005 (select) > Video Capture: Frame #006 (select) > Video Capture: Frame #007 (select) > Video Capture: Frame #008 (select) > Video Capture: Frame #009 (select) > Video Capture: Frame #010 (select) > Video Capture: Frame #011 (select) > Video Capture: Frame #012 (select) > Video Capture: Frame #013 (select) > Video Capture: Frame #014 (select) > Video Capture: Frame #015 (select) > Video Capture: Frame #016 (select) > Video Capture: Frame #017 (select) > Video Capture: Frame #018 (select) > Video Capture: Frame #019 (select) > Video Capture: Frame #020 (select) > Video Capture: Frame #021 (select) > Video Capture: Frame #022 (select) > Video Capture: Frame #023 (select) > Video Capture: Frame #024 (select) > Video Capture: Frame #025 (select) > Video Capture: Frame #026 (select) > Video Capture: Frame #027 (select) > Video Capture: Frame #028 (select) > Video Capture: Frame #029 (select) > Video Capture: Frame #030 (select) > Video Capture: Frame #031 (select) > Video Capture: Frame #032 (select) > Video Capture: Frame #033 (select) > Video Capture: Frame #034 (select) > Video Capture: Frame #035 (select) > Video Capture: Frame #036 (select) > Video Capture: Frame #037 (select) > Video Capture: Frame #038 (select) > Video Capture: Frame #039 (select) > Video Capture: Frame #040 (select) > Video Capture: Frame #041 (select) > Video Capture: Frame #042 (select) > Video Capture: Frame #043 (select) > Video Capture: Frame #044 (select) > Video Capture: Frame #045 (select) > Video Capture: Frame #046 (select) > Video Capture: Frame #047 (select) > Video Capture: Frame #048 (select) > Video Capture: Frame #049 (select) > Video Capture: Frame #050 (select) > Video Capture: Frame #051 (select) > Video Capture: Frame #052 (select) > Video Capture: Frame #053 (select) > Video Capture: Frame #054 (select) > Video Capture: Frame #055 (select) > Video Capture: Frame #056 (select) > Video Capture: Frame #057 (select) > Video Capture: Frame #058 (select) > Video Capture: Frame #059 (select) > > test MMAP (select, CREATE_BUFS): OK > > Video Capture: Frame #000 (epoll) > Video Capture: Frame #001 (epoll) > Video Capture: Frame #002 (epoll) > Video Capture: Frame #003 (epoll) > Video Capture: Frame #004 (epoll) > Video Capture: Frame #005 (epoll) > Video Capture: Frame #006 (epoll) > Video Capture: Frame #007 (epoll) > Video Capture: Frame #008 (epoll) > Video Capture: Frame #009 (epoll) > Video Capture: Frame #010 (epoll) > Video Capture: Frame #011 (epoll) > Video Capture: Frame #012 (epoll) > Video Capture: Frame #013 (epoll) > Video Capture: Frame #014 (epoll) > Video Capture: Frame #015 (epoll) > Video Capture: Frame #016 (epoll) > Video Capture: Frame #017 (epoll) > Video Capture: Frame #018 (epoll) > Video Capture: Frame #019 (epoll) > Video Capture: Frame #020 (epoll) > Video Capture: Frame #021 (epoll) > Video Capture: Frame #022 (epoll) > Video Capture: Frame #023 (epoll) > Video Capture: Frame #024 (epoll) > Video Capture: Frame #025 (epoll) > Video Capture: Frame #026 (epoll) > Video Capture: Frame #027 (epoll) > Video Capture: Frame #028 (epoll) > Video Capture: Frame #029 (epoll) > Video Capture: Frame #030 (epoll) > Video Capture: Frame #031 (epoll) > Video Capture: Frame #032 (epoll) > Video Capture: Frame #033 (epoll) > Video Capture: Frame #034 (epoll) > Video Capture: Frame #035 (epoll) > Video Capture: Frame #036 (epoll) > Video Capture: Frame #037 (epoll) > Video Capture: Frame #038 (epoll) > Video Capture: Frame #039 (epoll) > Video Capture: Frame #040 (epoll) > Video Capture: Frame #041 (epoll) > Video Capture: Frame #042 (epoll) > Video Capture: Frame #043 (epoll) > Video Capture: Frame #044 (epoll) > Video Capture: Frame #045 (epoll) > Video Capture: Frame #046 (epoll) > Video Capture: Frame #047 (epoll) > Video Capture: Frame #048 (epoll) > Video Capture: Frame #049 (epoll) > Video Capture: Frame #050 (epoll) > Video Capture: Frame #051 (epoll) > Video Capture: Frame #052 (epoll) > Video Capture: Frame #053 (epoll) > Video Capture: Frame #054 (epoll) > Video Capture: Frame #055 (epoll) > Video Capture: Frame #056 (epoll) > Video Capture: Frame #057 (epoll) > Video Capture: Frame #058 (epoll) > Video Capture: Frame #059 (epoll) > > test MMAP (epoll, CREATE_BUFS): OK > test USERPTR (no poll): OK (Not Supported) > test USERPTR (select): OK (Not Supported) > test DMABUF (no poll): OK (Not Supported) > test DMABUF (select): OK (Not Supported) > > Total for uvcvideo device /dev/video0: 59, Succeeded: 58, Failed: 1, Warn= ings: 0 > > --- > Changes in v5: > - Add DMA buffer alignment and padding for commands, responses, and the e= vent > buffer > - Corrected styling of kernel-doc comments > - Removed the configurable ``driver_name`` module parameter > - Moved the protocol to ``include/uapi/linux/virtio_media.h`` > - Link to v4: https://lore.kernel.org/all/20260622204343.1994418-1-briand= [email protected]/ > > Changes in v4: > - Rebased on top of v7.1-rc1 > - Replace usages of filep->private_data with file_to_v4l2_fh() > throughout the driver > - Link to v3: https://lore.kernel.org/r/20250412-virtio-media-v3-1-97dc94= [email protected] > > Changes in v3: > - Rebased on top of v6.15-rc1 and removes obsolete control callbacks. > - Link to v2: https://lore.kernel.org/r/20250201-virtio-media-v2-1-ac8406= [email protected] > > Changes in v2: > - Fixed kernel test robot and media CI warnings (ignored a few false > positives). > - Changed in-driver email address to personal one since my Google one > will soon become invalid. > - Link to v1: https://lore.kernel.org/r/20250123-virtio-media-v1-1-81e254= [email protected] > > Brian Daniels (5): > media: virtio: Add skeleton virtio-media driver > media: virtio: Add session management > media: virtio: Add scatterlist builder > media: virtio: Add ioctl operations and driver logic > media: virtio: Add USERPTR memory type support > > MAINTAINERS | 8 + > drivers/media/Kconfig | 13 + > drivers/media/Makefile | 2 + > drivers/media/virtio/Makefile | 7 + > drivers/media/virtio/scatterlist_builder.c | 579 +++++++++ > drivers/media/virtio/scatterlist_builder.h | 112 ++ > drivers/media/virtio/session.h | 132 ++ > drivers/media/virtio/virtio_media.h | 97 ++ > drivers/media/virtio/virtio_media_driver.c | 951 ++++++++++++++ > drivers/media/virtio/virtio_media_ioctls.c | 1326 ++++++++++++++++++++ > include/uapi/linux/virtio_media.h | 287 +++++ > 11 files changed, 3514 insertions(+) > create mode 100644 drivers/media/virtio/Makefile > create mode 100644 drivers/media/virtio/scatterlist_builder.c > create mode 100644 drivers/media/virtio/scatterlist_builder.h > create mode 100644 drivers/media/virtio/session.h > create mode 100644 drivers/media/virtio/virtio_media.h > create mode 100644 drivers/media/virtio/virtio_media_driver.c > create mode 100644 drivers/media/virtio/virtio_media_ioctls.c > create mode 100644 include/uapi/linux/virtio_media.h > > > base-commit: 06cb687a5132fcffe624c0070576ab852ac6b568 > -- > 2.55.0.229.g6434b31f56-goog >