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[Qemu-devel] Re: [PATCHv2-repost] pcbios: enable io/memory unconditional
Michael S. Tsirkin
[Qemu-devel] Re: [PATCHv2-repost] pcbios: enable io/memory unconditionally
Mon, 30 Nov 2009 18:04:58 +0200
On Mon, Nov 30, 2009 at 10:00:23AM -0600, Anthony Liguori wrote:
> 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 <address@hidden>
> This is for stable?
This is for qemu-kvm as the description says.
>> This patch is needed for qemu-kvm as that is still using pcbios.
> Why hasn't qemu-kvm switched to seabios?
IMO it's better to fix bug then switch than the reverse.
This way you have a good base to compare against.
> Anthony Liguori