[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[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 16:18:44 +0200
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 <address@hidden>
> This patch is needed for qemu-kvm as that is still using pcbios.
After applying it, f0c728d09728825f7f8b6896adcf6e4fd58dc7ef
in qemu-kvm can be reverted.