On Wed, 2012-07-25 at 13:27 +0300, Avi Kivity wrote: > On 07/25/2012 06:57 AM, Benjamin Herrenschmidt wrote: > > Hi folks ! > > > > Would there be any objection to adding a second MMIO BAR to qemu-vga > > which mirrors the bochs magic VBE ports ? > > > > Support for IO space is optional in PCIe and can be problematic on some > > architectures, it would be nice to be able to program the card entirely > > using mmio. > > Can we choose a PCIe chipset that does support IO space?
Why bother ? It's not like mode setting is performance critical and IO space is always going to be a pain on non-x86 ... > If not, we can add a second BAR, but it should disappear when running an > older machine type. Well, the IO ports in legacy space are still there. We can also make the "register BAR" exist in both mode or we can add a second BAR and have x86 "prefer" IO... whatever rocks your boat as long as it's a BAR, it's the legacy hole that's annoying for me :-) > > Once done, I'd like to look into doing a qemudrmfb similar to the cirrus > > one that pretty much gives you generic KMS support (with RandR) on top > > of vga-pci. This would have the advantage of potentially lifting the > > pitch and size limitations that plague cirrus. > > Have a look at qxl. No I haven't :-) I'll have a look, thanks. Cheers, Ben.
