Page History

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• 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

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• 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