On Tue, Oct 11, 2011 at 08:17:28AM -0500, Anthony Liguori wrote: > On 10/11/2011 04:55 AM, Avi Kivity wrote: > >On 10/11/2011 11:50 AM, Gleb Natapov wrote: > >>But loading MBs of data through fw_cfg interface is just abusing it. > >>You wouldn't use pio on real HW to move megabytes of data and expect > >>good performance. > > > >True, this is a point in favour of a true dma interface. > > Doing kernel loading through fw_cfg has always been a bit ugly. > > A better approach would be to implement a PCI device with a ROM bar > that contained an option ROM that read additional bars from the > device to get at the kernel and initrd.
If one is willing to add a PCI device, then one could add a virtio block device with a non-standard PCI device/vendor code and teach SeaBIOS to scan these non-standard ids. It's a bit of a hack, but it would be a simple way of creating a drive visible by the bios but hidden from the OS. -Kevin
