linux-kernel - Re: [PATCH v7 7/9] drm/virtio: Improve DMA API usage for shmem BOs

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Message-ID: <20220706071301.43fvbioka4iksqup@sirius.home.kraxel.org>
Date:   Wed, 6 Jul 2022 09:13:01 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Dmitry Osipenko <dmitry.osipenko@...labora.com>
Cc:     kernel@...labora.com, David Airlie <airlied@...ux.ie>,
        Thomas Hellström <thomas_os@...pmail.org>,
        Emil Velikov <emil.l.velikov@...il.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Dmitry Osipenko <digetx@...il.com>,
        virtualization@...ts.linux-foundation.org,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH v7 7/9] drm/virtio: Improve DMA API usage for shmem BOs

  Hi,

> Gerd, thank you very much! It's was indeed unclear to me how to test the
> MMIO GPU, but yours variant with microvm works! I was looking for trying
> aarch64 in the past, but it also was unclear how to do it since there is
> no DT support for the VirtIO-GPU, AFAICS.

aarch64 uses acpi by default (can be disabled via 'qemu -no-acpi').
Not fully sure about arm(v7).

Even with DT it should work because DT only describes the virtio-mmio
'slots', not the actual virtio devices.

> There is no virgl support because it's a virtio-gpu-device and not
> virtio-gpu-device-gl that is PCI-only in Qemu. Hence everything seems good.

It's named 'virtio-gpu-gl-device'

take care,
  Gerd