...

Jul 22, 2020

Attendees:

• Jerry Zhao - Panasonic
• Walt Miner - Linux Foundation
• Scott Murray - Konsulko
• Tadao Tanikawa - Panasonic
• Takashi Tsubone - Panasonic
• Mikhail Golubev - Open Synergy
• Alex Bennée - Linaro
• Francois Ozog - Linaro
• Victor Duan - Linaro
• Vincent Guittot - Linaro
• Kenji Hosokawa - ADIT
• Yuki Tsunashima - ADIT
• Jakub Luzny - GSoC student
• Parth Dode - GSoC student

Agenda: 

• Topic 1: Messages & Information from AMM Meeting (Jerry, Jiancong Zhao, Walt Miner)
  • VirtIO is officially declared as a new feature in AGL KK in the roadmap sharing by Walt.
  • VirtIO related discussion was carried out in the advisory board, and following agreement achieved.
    • agl-dev-community@lists.automotivelinux.orgIntegration of VirtIO into AGL has been accepted by Advisory Board.
    • Study VirtIO as a candidate of the standard reference HAL interface for eco-system enhancement (including non-hypervisor environment)
  • Keynote Session about VirtIO and a proposal of unified virtualized display by Panasonic
    
    • Presentation Slide: https://static.sched.com/hosted_files/aglammsummer2020/3e/Device%20Virtualization%20Architecture%20in%20Automotive_Mashaige%20Mizuyama.pdf
    • Video: https://aglamm.automotivelinux.org/session-virtual/100/
  • Breakout Session about VirtIO technical sharing by OpenSynergy
    • Presentation Slide: https://static.sched.com/hosted_files/aglammsummer2020/10/OpenSynergy_virtio_AGL_AMM_15_07_20.pdf
    • Video: https://aglamm.automotivelinux.org/session-virtual/95/
• Topic 2: Presentation & Demo from Panasonic (Tsubone-san)
  • Unified Virtual Display
  • Details can be found in the keynote: https://static.sched.com/hosted_files/aglammsummer2020/3e/Device%20Virtualization%20Architecture%20in%20Automotive_Mashaige%20Mizuyama.pdf
• Topic 3: Linaro VirtIO Roadmap follow-up discussion- Technical Q&A (Alex, Vincent)
  • Presentation slide : https://drive.google.com/file/d/12qcg5TNQhPYpptK3B0DAMJz-VQ0S0hZp/view?usp=sharing

Aug 5, 2020

Attendees:

• Jerry Zhao - Panasonic
• Walt Miner - Linux Foundation
• Scott Murray - Konsulko
• Tadao Tanikawa - Panasonic
• Takashi Tsubone - Panasonic
• Mikhail Golubev - Open Synergy
• Laurent Cremmer -Carmeq
• Mark Silberberger - Carmeq
• Nicolas Blazevic - Carmeq 
• Alex Bennée - Linaro
• Mike Holmes - Linaro
• Victor Duan - Linaro
• Kenji Hosokawa - ADIT
• Jakub Luzny - GSoC student
• Rich Persaud

Agenda: 

• Topic 1: Yocto Architecture for VirtIO FEDD integration Mikhail Golubev
  • some SoC vendor's BSP kernel doesn't support Yocto Linux so that the virtio.scc may be not included.
  • it's better to maintain the front end driver or the kernel configuration in AGL.
  • Release candidate branch for AGL will be in January.
  • general idea is on master, but for recipe (patch and yocto layer only) → sandbox, source code → code repository
    Jerry, Jiancong Zhao need to check with Walt Miner on application of a new repository (JIRA ticket)
• Topic 2: VirtIO Backend Related Sharing  Laurent Cremmer
  • Presentation slide: AGL EG-Virt.pdf
• Topic 3: GSoC Project Progress Sharing Month #2 Parth Dode Jakub Luzny → move to next EG

Aug 19, 2020

Attendees:

• Jerry Zhao - Panasonic
• Walt Miner - Linux Foundation
• Scott Murray - Konsulko
• Tadao Tanikawa - Panasonic
• Mikhail Golubev - Open Synergy
• Laurent Cremmer -Carmeq
• Mark Silberberger - Carmeq
• Francois Ozog - Linaro
• Victor Duan - Linaro
• Kenji Hosokawa - ADIT
• Yuki Tsunashima - ADIT
• Eva Rio - Tuxera
• Joel Catala - Tuxera
• Christoph Mutz - Western Digital
• Matteo Zammattio - Western Digital
• Jakub Luzny - GSoC student
• Parth Dode - GSoC student
• Rich Persaud

Agenda: 

• Topic 1: GSoC Project Progress Sharing Month #2 Parth Dode Jakub Luzny 
• Topic 2: Follow-up Proposal for VirtIO Front-end Integration Mikhail Golubev

• View file
  name 2020-08-18 AGL EG virtio.pdf height 250

• Topic 3: Guest Speech on Xen Argo with VirtIO by Edgeform Chritopher Clark & Rich Persaud
  

  View file
  name Argo and VirtIO.pdf height 250

Remaining Action Items:

•  Jerry, Jiancong Zhao need to check with Walt Miner on application of a new repository (JIRA ticket)
•  Walt Miner  to find the editable doc for original AGL white paper. 

...

Sep 2, 2020

Attendees:

• Jerry Zhao - Panasonic
• Walt Miner - Linux Foundation
• Jan-Simon Moeller - Linux Foundation
• Scott Murray - Konsulko
• Mikhail Golubev - Open Synergy
• Laurent Cremmer -Carmeq
• Mark Silberberger - Carmeq
• Francois Ozog - Linaro
• Victor Duan - Linaro
• Kenji Hosokawa - ADIT
• Yuki Tsunashima - ADIT
• Eva Rio - Tuxera
• Joel Catala - Tuxera
• Christoph Mutz - Western Digital
• Marius Vlad - Collabora
• Jakub Luzny - GSoC student
• Parth Dode - GSoC student
• Rich Persaud

Agenda: 

• Topic 1: Final Presentation of GSOC Jailhouse Project Jakub Luzny Parth Dode
• Topic 2: Follow-up Q&A about virtio-argo (Chritopher Clark & Rich Persaud)
• Topic 3: Conclusion & Future Plan of AGL KK VirtIO Integration Mikhail Golubev
  Mikhail Golubev  please upload the slide you presented in last EG

Sep 16, 2020

Attendees:

• Jerry Zhao - Panasonic
• Walt Miner - Linux Foundation
• Jan-Simon Moeller - Linux Foundation
• Scott Murray - Konsulko
• Mikhail Golubev - Open Synergy
• Laurent Cremmer -Carmeq
• Mike Holmes - Linaro
• Francois Ozog - Linaro
• Victor Duan - Linaro
• Kenji Hosokawa - ADIT
• Yuki Tsunashima - ADIT
• Tadao Tanikawa - Panasonic
• Eva Rio - Tuxera
• Joel Catala - Tuxera
• Christoph Mutz - Western Digital
• Marius Vlad - Collabora

Agenda: 

• Topic 1: Future Plan of VirtIO Device in AGL
  • virtio-can not virtio-vehicle (virtio-can also include LIN)
  • virtio-camera: what is up with DRM?
  • virtio-tuner not virtio-radio (Linux v4l2 interface)
  • ACRN has smth for USB → needs to be checked
  • GNSS via virito-scmi? → needs to be checked
  • Mikhail Golubev  to upload the slide.

    • View file
      name 2020-09-16 AGL EG virtio.pptx height 250

Sep 30, 2020

Attendees:

• Jerry Zhao - Panasonic
• Walt Miner - Linux Foundation
• Jan-Simon Moeller - Linux Foundation
• Scott Murray - Konsulko
• Mikhail Golubev - Open Synergy
• Nicolas Blazevic - Carmeq
• Victor Duan - Linaro
• Francois Ozog - Linaro
• Tadao Tanikawa - Panasonic
• Christoph Mutz - Western Digital
• Matteo Zammattio - Western Digital
• Marius Vlad - Collabora

Agenda: 

...

• method 1: invite IVI, IC experts from other EG to join the discussion
  • Email in the mailing list is okay
  • Inter-EG activities are handled in the SAT
  • Announce & Invite in Dev Call is also possible (most people)
• method 2: invite GENIVI AVPS member to share their progress on the automotive virtio discussion

...

• Publish of OASIS specification will be the trigger for AGL virtio porting activities

...

• View file
  name 2020-09-30 AGL EG virtio.pptx height 250

Oct 14, 2020

Attendees:

• Jerry Zhao - Panasonic
• Walt Miner - Linux Foundation
• Jan-Simon Moeller - Linux Foundation
• Scott Murray - Konsulko
• Mikhail Golubev - Open Synergy
• Laurent Cremmer -Carmeq
• Mark Silberberger - Carmeq
• Nicolas Blazevic - Carmeq
• Mike Holmes - Linaro
• Alex Bennée - Linaro
• Victor Duan - Linaro
• Misami Hiramatsu - Linaro
• Kenji Hosokawa - ADIT
• Tadao Tanikawa - Panasonic

Agenda: 

...

...

https://ossalsjp20.sched.com/

...

Walt Miner to update the attendee of today's meeting

fix the link issue on the Wiki

Nov 11, 2020

Attendees:

• Jerry Zhao - Panasonic
• Walt Miner - Linux Foundation
• Jan-Simon Moeller - Linux Foundation
• Scott Murray - Konsulko
• Mikhail Golubev - Open Synergy
• Mark Silberberger - Carmeq
• Alex Bennée - Linaro
• Victor Duan - Linaro
• Tadao Tanikawa - Panasonic
• Christoph Mutz - Western Digital
• Joel Catala - Tuxera

Agenda: 

• Topic 1: Virtualization Webinar
  Webinar: Device Virtualization Architecture, Panasonic
  

  When:
  Thursday, 12 November 2020
  10:00pm to 11:00pm
  (UTC+00:00) UTC

  Where:
  Registration Required - See link below

  Organizer: Emily Olin eolin@linuxfoundation.org

  Description:

  AGL Community:

  We are very excited to kick-off a new webinar series that will feature presentations from AGL members on open source technologies, trends, product/project updates, tutorials, and more. 

  Please register to join us for our first webinar on November 12th at 2:00 pm PT:

  Device Virtualization Architecture in Automotive

  Mizuyama Masashige, Automotive CTO, Panasonic

  Thursday, November 12 at 2:00 PM Pacific 

  (Friday, November 13 at 7:00 am Japan)

  Registration link

...

...

Nov 25, 2020

Attendees:

Agenda: 

• Topic 1: VirtIO KK Porting Progress Mikhail Golubev
  • AGL KK progress is fine.
  • only virtio-input multi-touch patch is still not available because not upstreamed in the Linux kernel main line (waiting for the LKML to accept)
  • Yocto machine: merged in the AGL and additionally 
  • Question: demo image (set-up)
    → hypervisor distribution: Mikhail Golubevcheck internally
    → QEMU can also be also considered.
    VICTOR DUAN tell us where we can find the implementation of Linaro's ALS QEMU demo  
    • ALS image is the qemuarm64 JJ image from the website
    • QEMU is lightly patched: https://patchew.org/QEMU/20201105175153.30489-1-alex.bennee@linaro.org/
  • Question: Passthrough for GPU-3d?
    • yes, for ALS
    • for KK porting and reference implementation. VirtIO-gpu3d will be used insead
• Topic 2: ALS Presentation from Demo Jerry, Jiancong Zhao
  • General arrangement for ALS Jerry, Jiancong Zhao
    • Jerry, Jiancong Zhao will ask for the registration code for 
  • ALS Demo sharing with Q&A - Linaro VICTOR DUAN Alex
    • backend for real hardware: put it into the Dom0
    • Dom0 can be directly 
  • ALS Demo sharing with Q&A - OpenSynergy Mikhail Golubev

Dec 9, 2020

Attendees:

Agenda: 

...

• ALS 2020 video:
  
  • Linaro: 
  • OpenSynergy:
     

    Widget Connector
    url https://vimeo.com/480355821

2021

Jan 13, 2021

Attendees:

• Jerry Zhao - Panasonic
• Jan-Simon Moeller - Linux Foundation
• Scott Murray - Konsulko
• Mikhail Golubev - Open Synergy
• Laurent Cremmer - Carmeq
• Victor Duan - Linaro
• Tadao Tanikawa - Panasonic
• Binghua - Qualcomm
• Sonic - ?

Agenda: 

• Quick summary of virtual SAT on 09 Dec 2020 
  • virtio devices in the list  https://confluence.automotivelinux.org/display/VE/Support+VirtIO+Front+End+Driver+in+AGL has already be commited as a new machine (virtio-aarch64) in meta-agl-devel by 02 Dec 2020 
  • new virtio machine accepted to meta-agl with SAT approval.
  • Mikhail Golubev  will commit the migration from meta-agl-devel to meta-agl by 20 Jan 2021 
• Progress of virtio reference implementation Mikhail Golubev
  • The PoC will be ready by April and able to request download from AGL websites
  • The backend and HV are proprietary but frontend (including virtio drivers) are open and can be customized

...

Jan-Simon Moeller create new category for virt-EG to write documentation about virtio

...

• Present the reference implementation PoC in AMM
• What is the deadline for CFP

...

• 1st Open Discussion Workshop: Optimization of VirtIO-gpu3d (how to achieve zero-copy in gpu 3d mode) 20 Jan 2021  
• 2nd Open Discussion Workshop: What devices need to be virtualized for an virtual AGL (what else virtio-devices needed for AGL)  TBD

...

• Thanks so much for all the EG members for great work in  2020! Happy new year!

Jan 20, 2021

Attendees:

• Jerry Zhao - Panasonic
• Jan-Simon Moeller - Linux Foundation
• Scott Murray - Konsulko
• Mikhail Golubev - Open Synergy
• Vasyl Vavrychuk - OpenSynergy
• Andriy Tryshnivsky - OpenSynergy
• Laurent Cremmer - Carmeq
• Mark Silberberg - Volkswagen
• Victor Duan - Linaro
• Alex Bennée (Stratos Tech Lead) - Linaro
• Peter Griffin (Multimedia Tech Lead) - Linaro 
• Tadao Tanikawa - Panasonic
• Binghua - Qualcomm
• Marius Vlad - Collabora
• Tadao Tanikawa - Panasonic
• Kenji Hosokawa - ADIT

• Harunobu Kurokawa - Renesas

• Masahiro Hasegawa - Renesas

• Tomeu Vizoso

• Venkata Ramalinga Prasad Tadepalli

• Parag Borkar - OpenSynergy

Agenda: 

• 1st VirtIO Workshop: VirtIO GPU-3d Performance - How to achieve Zero-Copy with AGL
• Open Synergy Slides (How to achieve zero-copy on Renesas SoC)
  VirtIO_GPU_3D_Workshop.pdf
  
  • cache coherence between CPU/GPU
  • Discussion Points:
    • Does VirtIO GPU supports zero-copy in QEMU, crosvm, etc?
      • crosvm uses host allocations, is it requirement for something?
      • progress in crosvm is on-going and realted to Vulkan.
      • crosvm use the virtio-pci (to expose host memory to guest - which also avoid memory copy)
      • Any available standard solution/platform to solve this zero-copy for the AGL community
        • Tomeu: Collabora is having project in ChromeBook (which is more focusing on gaming) but expose host memory to guest
        • Alex: not using virtio-pci may be the limitation (kiran explained why it is not because limitation →with 64 bit PCI addressing the windows are more than large enough)
        • Conclusion: there's no good solution available at the moment for zero-copy mechanism for automotive use case
      • Note: sometimes, copying smaller buffers ( < 4k) is faster then using zero copying
    • Does virglrender supports zero-copy of OpenGL buffers (vertex buffer, element buffer, etc.)?
      • there are some mechanisms in virglrender. no copy happened. (although some limitation may exist)
    • EXT_image_dma_buf_import fails with EGL_BAD_ACCESS
      
      • Tomeu: Reason is that specific platform stride requirements are not propagated to the guest. New IOCTL exist to propagate stride info to the guest, but not mainlined yet.

        • https://gitlab.freedesktop.org/olv/drm-misc-next/-/commit/6b2013a48528fc9ea1e82c6b68c85521f6d03041

        • why stride information is needed in guest?  This info will be pitched to MESA3d.
      • GPU/display supports only 32-bit addresses. Issue: ensure device guest (mesa) allocates memory form lower addresses
        
        • Bounce buffers:
          • Stratos prj is interested in a mechanism to limit guest's allocations to a particular mem window (potentially, breaking virtio driver mem model)
          • Kernel dma pools are being looked at. This will result in memcpy from userspace to kernel dma capable pool (page cache as well?)
    • Virglrenderer tests fails on R-CAR

Feb 3, 2021

Attendees:

• Jerry Zhao - Panasonic
• Jan-Simon Moeller - Linux Foundation
• Scott Murray - Konsulko
• Mikhail Golubev - Open Synergy
• Vasyl Vavrychuk - OpenSynergy
• Andriy Tryshnivsky - OpenSynergy
• Laurent Cremmer - Carmeq
• Mark Silberberg - Volkswagen
• Victor Duan - Linaro
• Francis Ozog - Linaro
• Masami Hiramatsu - Linaro
• Alex Bennée (Stratos Tech Lead) - Linaro
• Peter Griffin (Multimedia Tech Lead) - Linaro 
• Tadao Tanikawa - Panasonic
• Binghua - Qualcomm
• Marius Vlad - Collabora
• Tadao Tanikawa - Panasonic
• Kenji Hosokawa - ADIT

Agenda: 

• Development Progress of VirtIO feature for KK
  • virtio machine (virtio-aarch) has been merged to meta-agl (thanks Jan-Simon Moeller)
  • virtio related documentation (how to build, how to deploy) has been pushed but pending for review:
     https://gerrit.automotivelinux.org/gerrit/q/topic:%22SPEC-3778-virtio-documentation%22+(status:open%20OR%20status:merged)
    • 1  bitbake build (multi-config) 
      • multi-config can create image with backend and frontend in one build (one place) → still possible to build/update specific VM 
      • documentation still need to be updated 
  • Include virtio as KK feature into release note (Walt Miner, Jan-Simon Moeller)
  • Trial on KVM and Xen (Linaro Alex Bennée)
• Development Progress of AGL KK VirtIO Reference Demo on Reference Hardware Mikhail Golubev
• Sample virtio building for Reference Hardware EG
• Next Workshop about VirtIO-GPU
  • Summary of 1st Workshop
  • Candidate: 17 Feb 2021 

Feb 17, 2021

Attendees:

• Jerry Zhao - Panasonic
• Jan-Simon Moeller - Linux Foundation
• Scott Murray - Konsulko
• Mikhail Golubev - Open Synergy
• Vasyl Vavrychuk - OpenSynergy
• Parag Borkar - OpenSynergy
• Andriy Tryshnivsky - OpenSynergy
• Laurent Cremmer - Carmeq
• Mark Silberberg - Volkswagen
• Victor Duan - Linaro
• Francis Ozog - Linaro
• Masami Hiramatsu - Linaro
• Alex Bennée (Stratos Tech Lead) - Linaro
• Peter Griffin (Multimedia Tech Lead) - Linaro 
• Tadao Tanikawa - Panasonic
• Binghua - Qualcomm
• Marius Vlad - Collabora
• Tadao Tanikawa - Panasonic
• Kenji Hosokawa - ADIT

Agenda: 2nd workshop to Discuss how to achieve zero-copy for VirtIO GPU (3d mode)

Workshop Topic:
Follow up discussion on how to achieve Zero-Copy for VirtIO-GPU (3d mode)

Workshop Agenda:

• Quick review of 1st workshop discussion*
    *For the 1st workshop meeting notes, please find at https://confluence.automotivelinux.org/display/VE/Meeting+Agenda#MeetingAgenda-Jan20,2021
• Discussion on two methods to achieve zero-copy: dynamic vs dedicated heap
  • GPU/CPU cache coherency challenges 
  • Host allocation (share hostmem with guest) vs Guest allocation 
    • ChromeOS uses dynamic hostside allocation 
    • does host allocation and sharing introduce security concerns?
  • (over to Parag, OpenSynergy)
  • Dynamic vs Dedicated hostside allocation
    • where in host memory needs to be exposed to guest
    • host also has knowledge of where the real HW can see
  • Dedicated GPU heap (VRAM):
    • Idea: have a dedicated inter-vm shared mem area, guest requests buf params from hosts and allocates objects in shared memory and "sends" objects to host (paddrs)
    • What is needed to be done:
      • virtio gpu kernel driver adaptations → allocations from vram will be needed as well
      • MESA3d adaptations?
      • virgl adaptations
  • Can VFIO on Intel be applicable to the zero-copy case?
    • Which address space are buffers in? Can we use IOMMU for that?
    • IOMMU is a must have to defeat against DMA attacks
    • Intel pioneered VFIO; Huawei did develop so called "warpdrive" technology
    • François-Frédéric Ozogto check if the Huawei guy would like to give a speech on "warpdrive" in the Virtualization EG?
    • WarpDrive details:
      • https://lwn.net/Articles/761461/
      • https://connect.linaro.org/resources/hkg18/hkg18-214/
  • Type 1/2 HV: does the problem also apply to T2 HV?
    • There should be no difference between T1/2 HV, the same problem exists.
  • Xen HV:
    • QEmu - generic virtio backend for Xen
    • Virtio patches are being discussed
  • Updates from GPU workshop #1
    • Stride requirements were found (for RCar), hardcoded, but visual artifacts can be seen → activity postponed
• Discuss on how we should move forward
• Slides:

  • View file
    name virtiogpu3d_workshop-f1.pdf height 250

March 3, 2021

Attendees:

• Jerry Zhao - Panasonic
• Jan-Simon Moeller - Linux Foundation
• Scott Murray - Konsulko
• Mikhail Golubev - Open Synergy
• Vasyl Vavrychuk - OpenSynergy
• Andriy Tryshnivsky - OpenSynergy
• Laurent Cremmer - Carmeq
• Mark Silberberg - Volkswagen
• Victor Duan - Linaro
• Francis Ozog - Linaro
• Masami Hiramatsu - Linaro
• Alex Bennée (Stratos Tech Lead) - Linaro
• Peter Griffin (Multimedia Tech Lead) - Linaro 
• Tadao Tanikawa - Panasonic
• Binghua - Qualcomm
• Marius Vlad - Collabora
• Tadao Tanikawa - Panasonic
• Kenji Hosokawa - ADIT

Agenda: 

...

• would like to watch the archive of unified HMI demo
  • ALS Presentation from Virt-EG: 

    Widget Connector
    url https://www.youtube.com/watch?v=oEwmH1XVIz0&list=PLbzoR-pLrL6qfNemegyJ19ajZ_6f11qit&index=8

  • Webinar on Device Virtualization: 

    Widget Connector
    url https://www.youtube.com/watch?v=b1j5RpKbk8o

• would like to know when the unified HMI

...

17 Mar 2021

...

• VirtIO related documentation disappeared.
  https://docs.automotivelinux.org/en/master/
  • available on the git but not on the webpage (Jan-Simon Moelleris checking)
  • it seems to related to broswer cache and Jan to check further. But for virtio documentation it became alive again. https://docs.automotivelinux.org/en/master/#0_Getting_Started/2_Building_AGL_Image/5_4_Virtio/

...

• https://events.linuxfoundation.org/agl-amm/program/schedule/
• Introduction to Automotive Grade Linux - Walt Miner, The Linux Foundation
  • Mention Virt-EG work VirtIO? Any input/slide need from us?
  • Will introduce KK features
  • Jerry, Jiancong Zhaoto prepare a slide about Virt-EG work and send to Walt by 04 Mar 2021 
• (Virtualization Related) Obtaining VirtIO-enabled Virtualized AGL KK Reference Demo Distribution - Mikhail Golubev, OpenSynergy GmbH
  • deadline for recording video is Friday.
• (Virtualization Related) Software Define Architecture in a Car: Using VIRTIO to Change the Way the Car Software is Developed. - Tero Salminen, OpenSynergy GmbH
• (Virtualization Related) HTML5 on the AGL Demo Platform with Chromium and WAM - Lorenzo Tilve & Antía Puentes, Igalia
• (by EG member Kenji Hosokawa ) Functions and Requirements of Production Readiness Profile - Riku Nomoto, Woven Alpha, Inc. & Kenji Hosokawa, Advanced Driver Information Technology Corp.
  • IC-EG Leader: Haraki-san  haraki@hhq.suzuki.co.jp for virtualized IC use case
    • IC-EG QM (VirtIO) with AGL
    • FuSa features with ELISA
      • ElISA Information;
        • https://lists.elisa.tech/g/automotive
        • Github: https://github.com/elisa-tech/meta-elisa
        • Meeting Minutes: https://docs.google.com/document/d/1qgEkB6HBjq0ojoTSmI_E18BZco3lORK1ZZDrBH1YQo0/edit 
  • IVI-EG Leader: Nomoto-san riku.nomoto@woven-planet.global
    

...

Intel pioneered VFIO; Huawei did develop so called "warpdrive" technology → mainly for "server" hardware acceleration encryption & decryption (kind of passthrough but can be shared across different VMs)
https://connect.linaro.org/resources/bkk19/bkk19-401/

...

Type 1 hypervisor can passtrhough device for guest VM easily. But driver need to be have in the front end guest. (will be dependent onto SoC platform)

IOMMU should be able used but not used in the crosvm (instead, used host allocation). Coherent memory is needed.

...

...

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