linux-kernel - Re: [virtio-dev] Re: [PATCH] Add virtio gpu driver.

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Message-ID: <1427359367.9779.9.camel@nilsson.home.kraxel.org>
Date:	Thu, 26 Mar 2015 09:42:47 +0100
From:	Gerd Hoffmann <kraxel@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	virtio-dev@...ts.oasis-open.org, Dave Airlie <airlied@...il.com>,
	Dave Airlie <airlied@...hat.com>,
	David Airlie <airlied@...ux.ie>,
	Rusty Russell <rusty@...tcorp.com.au>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
	"open list:VIRTIO CORE, NET..." 
	<virtualization@...ts.linux-foundation.org>,
	"open list:ABI/API" <linux-api@...r.kernel.org>
Subject: Re: [virtio-dev] Re: [PATCH] Add virtio gpu driver.

  Hi,

> And is it possible to use offset within BAR and/or memory BARs?
> If yes I'd strongly prefer this.

What is the point?  Do you want place virtio regions and vga framebuffer
in the same pci bar?  Why?  virtio is mmio and traps into qemu on
access, whereas the vga framebuffer is memory-backed (with dirty
tracking turned on).  Don't think this is a good idea, even though the
memory api would probably allow to do this.

cheers,
  Gerd


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