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Re: [Qemu-devel] [RfC PATCH 03/15] virtio-pci: make pci bars configurabl


From: Gerd Hoffmann
Subject: Re: [Qemu-devel] [RfC PATCH 03/15] virtio-pci: make pci bars configurable
Date: Mon, 02 Mar 2015 14:10:46 +0100

  Hi,

> > Use case: For VirtIOPCIProxy subclasses which need additional pci bars,
> > such as virtio-vga.  With the new fields they can make sure the regions
> > do not conflict.
> > 
> > Signed-off-by: Gerd Hoffmann <address@hidden>
> 
> Hmm, I'd rather add an API to register a free BAR.
> What's wrong with that?

I want a fixed bar (for the legacy vga framebuffer), because that makes
things easier for vgabios etc.  Currently virtio-vga uses bar #2, and
I'd much prefer to not change that as support for this is in seabios
already.

I don't mind much how that is actually implemented though.  Reserving
bar #2 somehow, then have virtio_pci_device_plugged check this and place
the bars automatically in a non-conflicting way is fine with me too.

cheers,
  Gerd





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