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Date: Mon, 30 Nov 2009 16:18:44 +0200
From: "Michael S. Tsirkin" <mst@redhat.com>
Message-ID: <20091130141844.GA25629@redhat.com>
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Subject: [Qemu-devel] Re: [PATCHv2-repost] pcbios: enable io/memory
	unconditionally
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To: Avi Kivity <avi@redhat.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, kvm-devel <kvm@vger.kernel.org>

On Mon, Nov 30, 2009 at 04:17:22PM +0200, Michael S. Tsirkin wrote:
> On Thu, Oct 08, 2009 at 05:52:56PM +0200, Michael S. Tsirkin wrote:
> VGA adapters need to claim memory and i/o
> transactions even if they do not have any
> i/o or memory bars. E.g. PCI spec, page 297,
> gives an example of such a device:
> 
>         Programming interface 0000 0000b
>         VGA-compatible controller. Memory
>         addresses 0A 0000h through 0B
>         FFFFh. I/O addresses 3B0h to 3BBh
>         and 3C0h to 3DFh and all aliases of
>         these addresses.
> 
> While we could check for these devices and special-case them, it is
> easier to fix this by enabling i/o and memory space unconditionally:
> devices that do not support it will just ignore this setting.
> 
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
> 
> This patch is needed for qemu-kvm as that is still using pcbios.

After applying it, f0c728d09728825f7f8b6896adcf6e4fd58dc7ef
in qemu-kvm can be reverted.

-- 
MST