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Re: [PATCH] virtio-vga: fix virtio-vga bar ordering
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From: |
Gerd Hoffmann |
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Subject: |
Re: [PATCH] virtio-vga: fix virtio-vga bar ordering |
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Date: |
Thu, 23 Apr 2020 13:30:03 +0200 |
Hi,
> Just a question, why didn't we choose the virtio-vga order to avoid
> shuffling from the beginning? Vga came after and we keep the
> compatibility ?
Well, transitional virtio devices need bar 0 for legacy virtio
compatibility (io bar), so using bar 1 for msix makes sense in that
case.
virtio-vga is new enough that it supports modern only so it doesn't need
to worry about legacy virtio compatibility. It does have to worry about
vga compatibility though. Therefore it uses a bar layout different from
anyone else ...
cheers,
Gerd